Bosch a6ve Data sheet

Variable Plug-in Motor
A6VE

Data sheet

Series 63
Size Nominal pressure/Maximum pressure
28 to 160 400 bar/450 bar
250 350 bar/400 bar
Open and closed circuits

RE 91606/06.12 1/40
Replaces: 10.07

Contents

Ordering code for standard program 2

Technical data 4

HD – Proportional control hydraulic 9

EP – Proportional control electric 12

HZ – Two-point control hydraulic 15

EZ – Two-point control electric 16

HA – Automatic control high-pressure related 17

DA – Automatic control speed-related 21

Electric travel direction valve (for DA) 23

Dimensions 28 to 250 24

Connector for solenoids 28

Flushing and boost pressure valve 29

Counterbalance valve BVD and BVE 31

Counterbalance valve integrated BVI 35

Speed sensor 38

Installation instructions 39

General instructions 40

Features

Variable plug-in motor with axial tapered piston rotary group –
of bent-axis design, for hydrostatic drives in open and closed
circuits

Far-reaching integration in mechanical gearbox due to a –
recessed mounting flange located on the center of the case
(extremely space-saving construction)

Easy to install, simply plug into the mechanical gearbox (no –
configuration specifications to be observed)

Tested – unit ready to install

For use – especially in mobile applications

The displacement can be infinitely changed from –
V

to V

g max

The wide control range enables the variable motor to satisfy –
the requirement for high speed and high torque.

The output speed is dependent on the flow of the pump and –
the displacement of the motor.

The output torque increases with the pressure differential –
between the high-pressure and low-pressure side and with
increasing displacement.

g min

= 0.

2/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

Ordering code for standard program

A6V E / 63 W – V

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18

Axial piston unit

01

Bent-axis design, variable

Operating mode

02

Motor, plug-in version

Sizes (NG)

03

Geometric displacement, see table of values on page 7

Control devices 28 55 80 107 160 250

Proportional control hydraulic Δ

Δ

p =

p =

10 bar

25 bar

Two-point control hydraulic

Proportional control electric 12 V

Two-point control electric 12 V

04

Automatic control
high-pressure related

with minimum pressure increase Δp ≤ 10 bar

with pressure increase Δp = 100 bar

with minimum pressure increase Δp ≤ 10 bar

Automatic control speed related

p

p

= 3/100, hydraulic travel direction valve

St/pHD

= 5/100, electric travel direction valve + electric V

St/pHD

-circuit 24 V

g max

28 55 80 107 160 250

l l l l l l

l l l l l l

– – – – –

– – –

l

–

l l l l

l l l l l l

24 V

l l l l l l

– – –

l

24 V

12 V

24 V

l

–

–

– – –

l l l

l l l

l l l l l l

l l l l l l

–

l l l l

– – – – –

l l l l l

l

1)

l l

l l

– –

– –

A6V

E

HD1

HD2

HZ

l

–

HZ1

–

HZ3

EP1

EP2

EZ1

EZ2

EZ3

EZ4

HA1

HA2

–

HA3

DA

l

– DA3

1)

Pressure control (only for HD, EP)

Without pressure control (without code)

05

Pressure control, fixed setting

Override of controls HA

Without override (without code)

06

Hydraulic override, remote control, proportional

Series

07

Series 6, index 3

Direction of rotation

08

Viewed on drive shaft, bidirectional

Setting ranges for displacement

V

09

= 0 to 0.7 V

g min

= 0 to 0.4 V

V

g min

> 0.4 V

V

g min

g max

(without code)

g max

g max

to 0.8 V

g max

2)

V

V

g max

g max

= V

= V

g max

g max

to 0.8 V

to 0.8 V

g max

g max

28 55 80 107 160 250

— — — — — 1

— — — — —

Seals 28 55 80 107 160 250

10

FKM (fluor-caoutchouc)

l l l l l l

= Available m = On request – = Not available = Preferred program

Only1) possible in combination with port plate 22 (integrated
counterbalance valve).

Specify 2) exact settings for V
ordering: V

= ... cm3, V

g min

g min

g max

and V

= ... cm

in plain text when

g max

3

D

T

63

W

—

2

V

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 3/40

Ordering code for standard program

A6V E / 63 W – V

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18

Drive shafts 28 55 80 107 160 250

Splined shaft DIN 5480

11

Mounting flanges 28 55 80 107 160 250

Similar to ISO 3019-2 2-hole

12

4-hole – – – – –

Modified adapter flange 2-hole – – –

–

l

–

l

–

l

–

l

l l l l l

l

l

–

– –

–

A

Z

l

–

L

M

l

U

Port plates for service lines

3)

SAE flange ports
A and B at side, opposite

SAE flange ports
A and B at bottom only with integrated counterbalance valve BVI

13

Port plate with 1-level pressure-relief valves for
mounting a counterbalance valve

5)7)

BVD

BVE

02 0

22 1

4)

37

38
38

28 55 80 107 160 250

l l l l l l

7

l l l l l l

–

l l l l

–

2

0

8

l l l l

– – –

–

l l l l l

– – –

l

l l

– –

Valves (see pages 29 to 37)

Without valve

Brake release valve integrated
(pilot pressure for brake release)

14

Flushing and boost pressure valve mounted

Counterbalance valve mounted

6)7)

internal ducting

external piping

0

1

2

7

8

Speed sensor (see page 38) 28 55 80 107 160 250

Without speed sensor

15

Prepared for DSA speed sensor

DSA speed sensor mounted

8)

l l l l l l

m m m m m m

m m m m m m

Connector for solenoids (see page 28) 28 to 160 250

Without connector (without solenoid, only with hydraulic controls)

(size 250 without code) –

16

DEUTSCH – molded connector, 2-pin – without suppressor diode

l

l

HIRSCHMANN connector – without suppressor diode (without code) –

020

027

–

221

–

222
370

378

9)

380

9)

388

–

0

U

V

–

0

l

–

P

l

Beginning of control 28 55 80 107 160 250

Port plate 02, 37, 38 at V

17

Port plate 22 at V

(standard for HA)

g min

at V

at V

(standard for HD, HZ, EP, EZ, DA)

g max

(standard for HA3)

g min

(standard for HZ3)

g max

l l l l l l

l l l l l l

–

l l l l

–

l l l l

Standard / special version

Standard version (without code)

18

Standard version with installation variants (e. g. T ports against standard open or closed)

Special version

= Available m = On request – = Not available = Preferred program

3)

Metric fastening thread
Only4) for HZ3 and HA3. Add specification of integrated
counterbalance valve BVI, see separate ordering code on
page 35. Note the restrictions on page 36.
Only possible in conjunction with HD, EP and HA1 and HA2

5)

control
Specify ordering code of counterbalance valve according to

6)

data sheet (BVD – RE 95522, BVE - RE 95525) separately.
Note the restrictions on page 32.

7)

Specify ordering code of sensor according to data sheet 8)
(DSA – RE 95133) separately and observe the requirements
on the electronics.
Counterbalance valve MHB32, please contact us.

9)

A

B

–

B

–

B

-Y

-S

4/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

t

min

= -40 °C t

max

= +115 °C

-40° -25° -10 ° 10 ° 30° 50° 90° 115 °70°

0°

5

10

40

60

20

10 0

200

400

600

1000

1600

-40° 0° 20° 40° 60° 80° 10 0°-20°
1600

ν

opt

16

36

VG 22

VG 32

VG 46

VG 68

VG 100

5

Technical data

Hydraulic fluid

Before starting project planning, please refer to our data
sheets RE 90220 (mineral oil), RE 90221 (environmentally
acceptable hydraulic fluids), RE 90222 (HFD hydraulic fluids)
and RE 90223 (HFA, HFB, HFC hydraulic fluids) for detailed
information regarding the choice of hydraulic fluid and applica­tion conditions.

The variable motor A6VE is not suitable for operation with
HFA hydraulic fluid. If HFB, HFC, or HFD or environmentally
acceptable hydraulic fluids are used, the limitations regarding
technical data or other seals must be observed.

Selection diagram

/s]

2

Viscosity ν [mm

Details regarding the choice of hydraulic fluid

The correct choice of hydraulic fluid requires knowledge of the
operating temperature in relation to the ambient temperature: in
a closed circuit, the circuit temperature, in an open circuit, the
reservoir temperature.

The hydraulic fluid should be chosen so that the operating
viscosity in the operating temperature range is within the
optimum range (ν

see shaded area of the selection diagram).

opt

We recommended that the higher viscosity class be selected
in each case.

Example: At an ambient temperature of X °C, an operating tem­perature of 60 °C is set in the circuit. In the optimum viscosity
range (ν

, shaded area) this corresponds to the viscosity

opt.

classes VG 46 or VG 68; to be selected: VG 68.

Note

The case drain temperature, which is affected by pressure and
speed, can be higher than the circuit temperature or reservoir
temperature. At no point of the component may the tempera­ture be higher than 115 °C. The temperature difference speci­fied below is to be taken into account when determining the
viscosity in the bearing.

If the above conditions cannot be maintained due to extreme
operating parameters, we recommend flushing the case with a
flushing and boost pressure valve (see page 29).

Hydraulic fluid temperature range

Viscosity and temperature of hydraulic fluid

Viscosity [mm2/s] Temperature Comment

Transport and storage
at ambient temperature

(Cold) start-up

1)

ν

= 1600 TSt ≥ -40 °C t ≤ 3 min, without load (p ≤ 50 bar),

max

≥ -50 °C

T

min

T

= +5 °C to +20 °C

opt

Permissible temperature difference ΔT ≤ 25 K between axial piston unit and hydraulic fluid

Warm-up phase ν < 1600 to 400 T = -40 °C to -25 °C At p ≤ 0.7• p

Operating phase

Temperature difference ΔT = approx. 12 K

Maximum temperature 115 °C in the bearing

Continuous operation ν = 400 to 10

= 36 to 16

ν

opt

1)

2)

ν

≥ 7 T

min

Short-term operation

FKM shaft seal

1)

At temperatures below -25 °C, an NBR shaft seal is required (permissible temperature range: -40 °C to +90 °C).
Size 250, 2) please contact us.

103 °C measured at port T

T = -25 °C to +90 °C measured at port T,

= +103 °C measuredatportT,t<3min,p<0.3•p

max

T ≤ +115 °C see page 5

factory preservation: up to 12 months with standard,
up to 24 months with long-term

n ≤ 1000 rpm
n ≤0.25• n

(sizes 28 to 160)

(size 250)

nom

, n ≤ 0.5•n

nom

,

and t ≤ 15 min

nom

between hydraulic fluid in the bearing and at port T.

no restriction within the permissible data

nom

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 5/40

0

1

2

3

4

5

2000 4000 6000 8000 10000

Technical data

Filtration of the hydraulic fluid

Finer filtration improves the cleanliness level of the hydraulic
fluid, which increases the service life of the axial piston unit.

To ensure the functional reliability of the axial piston unit, a gra­vimetric analysis of the hydraulic fluid is necessary to determine
the amount of solid contaminant and to determine the cleanli­ness level according to ISO 4406. A cleanliness level of at
least 20/18/15 is to be maintained.

At very high hydraulic fluid temperatures (90 °C to maximum
115 °C), a cleanliness level of at least 19/17/14 according to
ISO 4406 is necessary.

If the above classes cannot be achieved, please contact us.

Shaft seal

Permissible pressure loading

The service life of the shaft seal is influenced by the speed of
the axial piston unit and the case drain pressure (case pres­sure). The mean differential pressure of 2 bar between the
case and the ambient pressure may not be enduringly exceed­ed at normal operating temperature. For a higher differential
pressure at reduced speed, see diagram. Momentary pressure
spikes (t < 0.1 s) of up to 10 bar are permitted. The service life
of the shaft seal decreases with an increase in the frequency of
pressure spikes.

The case pressure must be equal to or higher than the ambient
pressure.

Speed n in rpm

Influence of case pressure on beginning of
control

An increase in case pressure affects the beginning of control
of the variable motor when using the following control options:

HD, HA.T (sizes 28 to 160) ______________________ increase
HD, EP, HA, HA.T (size 250) _____________________ increase
DA _________________________________________ decrease

With the following controls, an increase in the case pressure
has no influence on the beginning of control:
EP, HA (sizes 28 to 160)

The factory settings for the beginning of control are made at
p

= 2 bar (sizes 28 to 16 0) or p

abs

pressure.

= 1 bar (size 250) case

abs

Direction of flow

Direction of rotation, viewed on drive shaft
cw ccw
A to B B to A

NG160

NG107

NG80

NG55

NG28

Differential pressure Δp [bar]

The values are valid for an ambient pressure p

Temperature range

The FKM shaft seal may be used for case drain temperatures
from -25 °C to +115 °C.

Note

For application cases below -25 °C, an NBR shaft seal is
required (permissible temperature range: -40 °C to +90 °C).
State NBR shaft seal in plain text when ordering.
Please contact us.

NG250

NG160

NG107

NG80

= 1 bar.

abs

NG28NG55

6/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

V

g max

V

g x

0.3 V

g max

1

2

4

6

8

10

12

14

16

0 0.4

1)

0.2

2)

0.7

1)

0.52)

1.0

1)

0.82)

1.3

1)

1.1

2)

1.6

1)

1.4

2)

t

1

t

2

t

n

Technical data

Operating pressure range

(operating with mineral oil)

Pressure at service line port A or B

Sizes 28 to 160

Nominal pressure p

Maximum pressure p

Single operating period _____________________________ 10 s
Total operating period _____________________________ 300 h

Size 250

Nominal pressure p

Maximum pressure p

Single operating period _____________________________ 10 s
Total operating period _____________________________ 300 h

Minimum pressure (high-pressure side) ___25 bar absolute

Summation pressure (pressure A + pressure B) p

Rate of pressure change R

with integrated pressure-relief valve_____________ 9000 bar/s
without pressure-relief valve __________________ 16000 bar/s

Minimum pressure – pump mode (inlet)

To prevent damage to the axial piston motor in pump operation
mode (change of high-pressure side with unchanged direction
of rotation, e. g. when braking), a minimum pressure must be
guaranteed at the service line port (inlet). This minimum pres­sure is dependent on the speed and displacement of the axial
piston unit (see characteristic curve below).

_________________ 400 bar absolute

nom

________________ 450 bar absolute

max

_________________ 350 bar absolute

nom

________________ 400 bar absolute

max

_ 700 bar

Su

A max

Definition

Nominal pressure p

nom

The nominal pressure corresponds to the maximum design
pressure.

Maximum pressure p

max

The maximum pressure corresponds to the maximum operat­ing pressure within the single operating period. The sum of the
single operating periods must not exceed the total operating
period.

Minimum pressure (high-pressure side)

Minimum pressure at the high-pressure side (A or B) which is
required in order to prevent damage to the axial piston unit.

Summation pressure p

Su

The summation pressure is the sum of the pressures at both
service line ports (A and B).

Rate of pressure change R

A

Maximum permissible rate of pressure rise and reduction dur­ing a pressure change over the entire pressure range.

p

nom

Δt

Δp

Pressure p

Time t

[bar]

abs

Inlet pressure p

1)

For sizes 28 to 160

2)

For size 250

Speed n / n

nom

This diagram is valid only for the optimum viscosity range from

ν

= 36 to 16 mm2/s.

opt

Please contact us if the above conditions cannot be satisfied.

Note

Values for other hydraulic fluids, please contact us.

Single operating period

Maximum pressure p
Nominal pressure p

nom

Pressure p

Minimum pressure (high-pressure side)

Total operating period = t

max

Time t

1 + t2 + ... + tn

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 7/40

1.3 1.52

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.58

NG160

NG28, 55,
80, 107

NG250

5)

1.0

0.8

0.75

0.63

0.6

0.4

0.38

0.2

0

Technical data

Table of values (theoretical values, without efficiency and tolerances; values rounded)

Size NG 28 55 80 107 160 250

Displacement geometric
per revolution

Speed maximum

2)

(while adhering to

1)

,

V

V

V

g max

g min

g x

the maximum permissible input flow)

at V

g max

< V

At V

g

at V

g 0

Input flow

at n

nom

4)

Torque

At V

g max

At V

g max

(see diagram below) n

g x

3)

and V

g max

and Δp = 400 bar T Nm 17 9 349 509 681 1019 –
and Δp = 350 bar T Nm 157 305 446 596 8 91 13 91

n

n

q

nom

max

max

V max

Rotary stiffness

to V

V

V

g max

g/2

to 0

g/2

(interpolated)

Moment of inertia for rotary group J

Maximum angular acceleration

c

min

c

max

GR

a

Case volume V L 0.5 0.75 1.2 1.5 2.4 3.0

Mass (approx.)

Port plate 02, 37, 38 m kg 16 26 34 47 64 90

Port plate 22 m kg – 35 43 53 72 –

1) are infinitely adjustable, see ordering code, page 2.

The minimum and maximum displacement
(standard setting for size 250 if not specified in the order: V
The values

2) are valid:

-

for the optimum viscosity range from ν

= 36 to 16 mm2/s

opt

- with hydraulic fluid based on mineral oils
Restriction of input flow with counterbalance valve, see page 3

3) 2

Torque without radial force, with radial force see page 8

4)

3

cm

cm

cm

28.1 54.8 80 107 160 250

3

0 0 0 0 0 0

3

18 35 51 68 61 18 8

rpm 5550 4450 3900 3550 3100 2700

rpm 8750 7000 6150 5600 4900 3600

rpm 10450 8350 7350 6300 5500 3600

L/min 156 244 312 380 496 675

KNm/rad 6 10 16 21 35 60

KNm/rad 18 32 48 65 105 181

2

kgm

rad/s

0.0014 0.0042 0.008 0.0127 0.0253 0.061

2

47000 31500 24000 19000 11000 10000

g min

=0.2•V

g max

, V

g max

= V

g max

).

Note

Operation above the maximum values or below the minimum values may result in a loss of function, a reduced service life or in the
destruction of the axial piston unit. Other permissible limit values, with respect to speed variation, reduced angular acceleration as
a function of the frequency and the permissible startup angular acceleration (lower than the maximum angular acceleration) can be
found in data sheet RE 90261.

Permissible displacement in relation to speed

g max

/ V

g

Displacement V

Speed n / n

nom

Values in this range on request5)

8/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

a

F

q

–

+

F

ax

ϕ

o

p

t

=

4

5

°

ϕ

o

p

t

=

4

5

°

ϕ

o

p

t

=

7

0

°

ϕ

o

p

t

=

7

0

°

Technical data

Permissible radial and axial forces of the drive shafts

Size NG 28 55 80 107 160 250

Drive shaft ø mm 30 30 40 40 50 50

1)

Maximum radial force
at distance a
(from shaft collar)

with permissible torque

≙ Permissible pressure Δp at V

Maximum axial force

2)

Permissible axial force per bar
operating pressure

With intermittent operation.1)
Maximum permissible axial force during standstill or when the axial piston unit is operating in non-pressurized condition.2)
When 3) at a standstill or when axial piston unit operating in non-pressurized conditions. Higher forces are permissible when
under pressure, please contact us.
Please contact us.

4)

F

q max

N 4838 7581 10283 13758 16435 1200

a mm 17.5 17.5 22.5 22.5 27.5 41

g max

T

max

p

nom perm.

+F

ax max

–F

ax max

F

ax perm./bar

Nm 17 9 281 509 681 1019

bar 400 322 400 400 400

N 315 500 710 900 1120 1200

N 0 0 0 0 0 0

N/bar 4.6 7.5 9.6 11.3 15.1

4)

4)

4)

3)

Note

Influence of the direction of the permissible axial force:

+F

= Increase in service life of bearings

ax max

–F

= Reduction in service life of bearings (avoid)

ax max

Effect of radial force F

By selecting a suitable direction of radial force F

on the service life of bearings

q

, the load on the bearings, caused by the internal rotary group forces can be

q

reduced, thus optimizing the service life of the bearings. Recommended position of mating gear is dependent on direction of rota­tion. Examples:

Toothed gear drive V-belt drive

Alternating
direction of
rotation

Alternating
direction of
rotation

"Counter-clockwise"

direction of rotation

Pressure at port B

"Clockwise"

direction of rotation

Pressure at port A

"Counter-clockwise"

direction of rotation

Pressure at port B

Determining the operating characteristics

V

Input flow qv=

Speed n =

Torque T =

Power P =

g

1000•η

•1000•η

q

V

V

•Δp•η

V

g

20•π

2 π•T•n

60000 600

•n

g

V

v

[L/min]

mh

v

q

•Δp•η

v

=

t

[min-1]

[Nm]

[kW]

= Displacement per revolution in cm

g

Δp = Differential pressure in bar

n = Speed in rpm

η

= Volumetric efficiency

v

η

= Mechanical-hydraulic efficiency

mh

η

= Total efficiency (ηt = ηv•ηmh)

t

3

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 9/40

32.5
30
28

24

20

16

12

8

4
2

0 0.2 0.4 0.6 0.8 1.0

V

g min

V

g max

Vg / V

g max

80

70

60

50

40

30

20

10

5

0 0.2 0.4 0.6 0.8 1.0

V

g min

V

g max

Vg / V

g max

35

HD – Proportional control hydraulic

The proportional hydraulic control provides infinite setting of
the displacement, proportional to the pilot pressure applied to
port X.

Beginning of control at V –

(maximum torque, minimum

g max

speed at minimum pilot pressure)

End of control at V –

(minimum torque, maximum permis-

g min

sible speed at maximum pilot pressure)

Note

Maximum permissible pilot pressure: p –

= 100 bar

St

The control oil is internally taken out of the high-pressure –
side of the motor (A or B). For reliable control, an operating
pressure of at least 30 bar is required in A (B). If a control
operation is performed at an operating pressure < 30 bar, an
auxiliary pressure of at least 30 bar must be applied at port
G via an external check valve. For lower pressures, please
contact us.
Please note that pressures up to 450 bar can occur at
port G.

Please state the desired beginning of control in plain text –
when ordering, e. g.: beginning of control at 10 bar.

The beginning of control and the HD characteristic are influ- –
enced by the case pressure. An increase in case pressure
causes an increase in the beginning of control (see page 5)
and thus a parallel shift of the characteristic.

A leakage flow of maximum 0.3 L/min can escape at port X –
due to internal leakage (operating pressure > pilot pressure).
The control is to be suitably configured to avoid an indepen­dent build-up of pilot pressure.

HD2
Pilot pressure increase ΔpSt = 25 bar

A pilot pressure increase of 25 bar at port X results in a de­crease in displacement from V
or from V

g max

to 0.2 V

(size 250).

g max

Beginning of control, setting range ______________5 to 35 bar

Standard setting:
Beginning of control at 10 bar (end of control at 35 bar)

HD2 characteristic

Sizes 28 to 200
Size 250

to 0 cm3 (sizes 28 to 160)

g max

[bar]

St

Pilot

increase

pressure

Pilot pressure p

control

Beginning of

setting range

Displacement

HD1
Pilot pressure increase Δp

A pilot pressure increase of 10 bar at port X results in a de­crease in displacement from V
or from V

Beginning of control, setting range ______________2 to 20 bar

Standard setting:
Beginning of control at 3 bar (end of control at 13 bar)

HD1 characteristic

to 0.2 V

g max

Sizes 28 to 200
Size 250

(size 250).

g max

= 10 bar

St

to 0 cm3 (sizes 28 to 160)

g max

[bar]

St

increase

Pilot pressure

Pilot pressure p

setting range

Beginning of control

Displacement

10/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

T

2

T

1

M

1

V

g min

V

g max

B

A

X

G

M

B

B

X

V

g min

V

g max

G

M

T

1

A

T

2

M

A

HD – Proportional control hydraulic

Schematic HD1, HD2

Sizes 28 to 160

Schematic HD1, HD2

Size 250

Note

The spring return feature in the control part is not a safety
device

The control part can stick in an undefined position by inter­nal contamination (contaminated hydraulic fluid, abrasion or
residual contamination from system components). As a result,
the control will no longer respond correctly to the operator's
commands.

Check whether the application on your machine requires ad­ditional safety measures, in order to bring the driven actuator
into a controlled and safe position (immediate stop). If neces­sary, make sure these are properly implemented.

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 11 /40

T

2

T

1

M

1

V

g min

V

g max

B

A

G

X

M

B

B

X

V

g min

V

g max

G

M

G

2

T

1

A

T

2

M

A

HD – Proportional control hydraulic

HD.D
Pressure control, fixed setting

The pressure control overrides the HD control function. If the
load torque or a reduction in motor swivel angle causes the
system pressure to reach the setpoint of the pressure control,
the motor will swivel towards a larger displacement.

The increase in the displacement and the resulting reduction in
pressure cause the control deviation to decrease. With the in­crease in displacement the motor develops more torque, while
the pressure remains constant.

Setting range of the pressure control valve
Sizes 28 to 160 ___________________________ 80 to 400 bar
Size 250 ______________________________ 80 to 350 to bar

Schematic HD.D

Sizes 28 to 160

Schematic HD.D

Size 250

12/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

0.2 0.4 0.6 0.8 1.0

1600

max

1400

1200

1000

800

600

400

200

V

g min

Vg / V

g max

V

g max

800

max

700

600

500

400

300

200

100

EP1

(12 V)

EP2

(24 V)

EP – Proportional control electric

The proportional electric control provides infinite setting of the
displacement, proportional to the control current applied to the
solenoid (sizes 28 to 200) or proportional valve (sizes 250).

For size 250, the pilot oil supply at port P requires an external
pressure of p

Beginning of control at V –

= 30 bar (p

min

= 100 bar).

max

(maximum torque, minimum

g max

speed at minimum control current)

End of control at V –

(minimum torque, maximum permis-

g min

sible speed at maximum control current)

Characteristic

Sizes 28 to 16 0
Size 250

Technical data, solenoid

Sizes 28 to 160

EP1 EP2

Voltage 12 V (±20 %) 24 V (±20 %)

Control current

Beginning of control 400 mA 200 mA

End of control 1200 mA 600 mA

Limiting current 1.54 A 0.77 A

Nominal resistance (at 20 °C) 5.5 Ω 22.7 Ω

Dither frequency 100 Hz 100 Hz

Duty cycle 100 % 100 %

Type of protection see connector design page 28

The following electronic controllers and amplifiers are available
for controlling the proportional solenoids:

BODAS controller RC –
Series 20 _________________________________ RE 95200
Series 21 __________________________________ RE 95201
Series 22 _________________________________ RE 95202
Series 30 _______________________ RE 95203, RE 95204
and application software

Analog amplifier RA – _________________________ RE 95230

Electric amplifier VT 2000, series 5X (see RE 29904) –
(for stationary application)

Further information can also be found on the Internet at
www.boschrexroth.com/mobile-electronics

Note

The control oil is internally taken out of the high-pressure
side of the motor (A or B). For reliable control, an operating
pressure of at least 30 bar is required in A (B). If a control
operation is performed at an operating pressure < 30 bar, an
auxiliary pressure of at least 30 bar must be applied at port
G via an external check valve. For lower pressures, please
contact us.
Please note that pressures up to 450 bar can occur at port G.

The following only needs to be noted for size 250:

The beginning of control and the EP characteristic are influ- –
enced by the case pressure. An increase in case pressure
causes an increase in the beginning of control (see page 5)
and thus a parallel shift of the characteristic.

Technical data, proportional valve

Size 250

EP1 EP2

Voltage 12 V (±20 %) 24 V (±20 %)

Beginning of control at V

End of control at V

g min

900 mA 450 mA

g max

1400 mA 700 mA
Limiting current 2.2 A 1.0 A

Nominal resistance (at 20 °C) 2.4 Ω 12 Ω

Duty cycle 100 % 100 %
Type of protection see connector design page 28

See also proportional pressure-reducing valve DRE 4K
(RE 29181).

Note

The spring return feature in the control part is not a safety
device

The control part can stick in an undefined position by inter­nal contamination (contaminated hydraulic fluid, abrasion or
residual contamination from system components). As a result,
the control will no longer respond correctly to the operator's
commands.

Check whether the application on your machine requires ad­ditional safety measures, in order to bring the driven actuator
into a controlled and safe position (immediate stop). If neces­sary, make sure these are properly implemented.

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 13/40

T

2

T

1

M

1

V

g min

V

g max

B

A

G

M

B

B

V

g min

V

g max

G

M

ST

T

1

A

T

2

M

A

M

P

EP – Proportional control electric

Schematic EP1, EP2

Sizes 28 to 160

Schematic EP1, EP2

Size 250

Proportional
pressure-reducing
valve DRE 4K
(see RE 29181)

14/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

T

2

T

1

V

g min

V

g max

B

A

G

M

1

M

B

B

V

g min

V

g max

G

M

ST

P

T

1

A

T

2

M

A

M

G

2

EP – Proportional control electric

EP.D
Pressure control, fixed setting

The pressure control overrides the EP control function. If the
load torque or a reduction in motor swivel angle causes the
system pressure to reach the setpoint of the pressure control,
the motor will swivel towards a larger displacement.

The increase in the displacement and the resulting reduction in
pressure cause the control deviation to decrease. With the in­crease in displacement the motor develops more torque, while
the pressure remains constant.

Setting range of the pressure control valve
Sizes 28 to 160 ___________________________ 80 to 400 bar
Size 250 ______________________________ 80 to 350 to bar

Schematic EP.D

Sizes 28 to 160

Schematic EP.D

Size 250

Proportional
pressure-reducing
valve DRE 4K
(see RE 29181)

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 15/40

T

1

T

2

X

G

V

g min

V

g max

B

A

T

2

T

1

M

1

V

g min

V

g max

B

A

X

G

M

B

B

X

V

g min

V

g max

G

M

T

1

A

T

2

M

A

HZ – Two-point control hydraulic

The two-point hydraulic control allows the displacement to be
set to either V

g min

or V

by switching the pilot pressure at

g max

port X on or off.

Position at V –

(without pilot pressure, maximum torque,

g max

minimum speed)

Position at V –

(with pilot pressure > 10 bar activated,

g min

minimum torque, maximum permissible speed)

Characteristic HZ

100

[bar]

S

10

Pilot pressure Δp

0

V

g min

Displacement

V

g max

Note

Maximum permissible pilot pressure: 100 bar –

The control oil is internally taken out of the high-pressure –
side of the motor (A or B). For reliable control, an operating
pressure of at least 30 bar is required in A (B). If a control
operation is performed at an operating pressure < 30 bar, an
auxiliary pressure of at least 30 bar must be applied at port
G via an external check valve. For lower pressures, please
contact us.
Please note that pressures up to 450 bar can occur at
port G.

A leakage flow of maximum 0.3 L/min is present at port X (op- –
erating pressure > pilot pressure). To avoid a build-up of pilot
pressure, pressure is to be relieved from port X to the reservoir.

Schematic HZ3

Sizes 55 to 107

Schematic HZ1

Sizes 28, 160

Schematic HZ

Size 250

Size 160
With integrated counterbalance valve BVI, see page 37

16/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

T

2

T

1

M

1

V

g min

V

g max

B

A

G

T

1

T

2

G

B

A

V

g min

V

g max

M

B

B

v

g min

v

g max

G

T

1

A

T

2

M

A

M

EZ – Two-point control electric

The two-point electric control with switching solenoid (sizes 28
to 160) or control valve (size 250) allows the displacement to
be set to either V

g min

or V

by switching the electric current

g max

at the switching solenoid or control valve on or off.

Note

The control oil is internally taken out of the high-pressure
side of the motor (A or B). For reliable control, an operating
pressure of at least 30 bar is required in A (B). If a control
operation is performed at an operating pressure < 30 bar, an
auxiliary pressure of at least 30 bar must be applied at port
G via an external check valve. For lower pressures, please
contact us.
Please note that pressures up to 450 bar can occur at port G.

Technical data, solenoid with Ø37

Sizes 28, 160

EZ1 EZ2

Voltage 12 V (±20 %) 24 V (±20 %)

Displacement V

Displacement V

g max

g min

de-energized de-energized

energized energized

Nominal resistance (at 20 °C) 5.5 Ω 21.7 Ω

Nominal power 26.2 W 26.5 W

Minimum required current 1.32 A 0.67 A

Duty cycle 100 % 100 %

Type of protection see connector design page 28

Schematic EZ1, EZ2

Sizes 28, 160

Schematic EZ3, EZ4

Sizes 55 to 107

Technical data, solenoid with Ø45

Sizes 55 to 107

EZ3 EZ4

Voltage 12 V (±20 %) 24 V (±20 %)

Displacement V

Displacement V

g max

g min

de-energized de-energized

energized energized

Nominal resistance (at 20 °C) 4.8 Ω 19.2 Ω

Nominal power 30 W 30W

Minimum required current 1.5 A 0.75 A

Duty cycle 100 % 100 %

Type of protection see connector design page 28

Technical data, control valve

Size 250

EZ1 EZ2

Voltage 12 V (±20 %) 24 V (±20 %)

Displacement V

Displacement V

Nominal resistance (at 20 °C) 6 Ω 23 Ω

Nominal power 26 W 26W

Minimum required current 2 A 1.04 A

g max

g min

de-energized de-energized

energized energized

Duty cycle 100 % 100 %

Type of protection see connector design page 28

Schematic EZ1, EZ2

Size 250

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 17 /40

HA – Automatic control high-pressure related

The automatic high-pressure related control adjusts the dis­placement automatically depending on the operating pressure.

The displacement of the A6VE motor with HA control is V
(maximum speed and minimum torque). The control unit mea­sures internally the operating pressure at A or B (no control
line required) and upon reaching the beginning of control, the
controller swivels the motor from V

g min

to V

with increase

g max

of pressure. The displacement is modulated between V
V

, thereby depending on load conditions.

g max

Beginning of control at V –

(minimum torque, maximum

g min

speed)

End of control at V –

(maximum torque, minimum speed)

g max

Note

For safety reasons, winch drives are not permissible with –
beginning of control at V

(standard for HA).

g min

The control oil is internally taken out of the high-pressure –
side of the motor (A or B). For reliable control, an operating
pressure of at least 30 bar is required in A (B). If a control
operation is performed at an operating pressure < 30 bar, an
auxiliary pressure of at least 30 bar must be applied at port
G via an external check valve. For lower pressures, please
contact us.
Please note that pressures up to 450 bar can occur at
port G.

The beginning of control and the – HA characteristic are influ­enced by the case pressure. An increase in case pressure
causes an increase in the beginning of control (see page 5)
and thus a parallel shift of the characteristic. Only for HA1T
(sizes 28 to 160) and HA1, HA2, HA3, HA.T, (size 250).

A leakage flow of maximum 0.3 L/min is present at port X (op- –
erating pressure > pilot pressure). To avoid a build-up of pilot
pressure, pressure is to be relieved from port X to the reservoir.
Only for control HA.T.

g min

g min

and

18/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

V

g min

400

350

300

250

200

150

100

80

50

0

V

g max

Vg/V

g min

0.2 0.4 0.6 0.8 1.0

B

A

M

1

T

2

T

1

V

g min

V

g max

G

X

M

B

B

V

g max

V

g min

G

X

T

1

A

T

2

M

A

M

HA – Automatic control high-pressure related

HA1, HA3
With minimum pressure increase

An operating pressure increase of Δp ≤ approx. 10 bar results
in an increase in displacement from 0 cm

160) or from 0.2 V

g max

to V

(size 250).

g max

Beginning of control, setting range
Sizes 28 to 160 ___________________________ 80 to 350 bar
Size 250 _________________________________ 80 to 340 bar

Please state the desired beginning of control in plain text when
ordering, e. g.: beginning of control at 300 bar.

Characteristic HA1, HA3

Operating pressure p[bar]

setting range

Beginning of control

3

to V

(sizes 28 to

g max

Pressure increase

Schematic HA1

Sizes 28 to 160

Size 250

Δp ≤ 10 bar

Sizes 28 to 16 0
Size 250

Displacement

Schematic HA3

Sizes 55 to 160
With integrated counterbalance valve BVI, see page 37

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 19/40

V

g min

400

350

300

250

200

150

100

80

50

0

V

g max

Vg/V

g max

0.2 0.4 0.6 0.8 1.0

B

A

M

1

T

2

T

1

G

X

V

g min

V

g max

M

B

B

V

g max

V

g min

G

X

T

1

A

T

2

M

A

M

HA – Automatic control high-pressure related

HA2
With pressure increase

An operating pressure increase of Δp = approx. 100 bar results
in an increase in displacement from 0 cm

160) or from 0.2 V

g max

to V

(size 250).

g max

Beginning of control, setting range
Sizes 28 to 160 ___________________________ 80 to 350 bar
Size 250 _________________________________ 80 to 250 bar

Please state the desired beginning of control in plain text when
ordering, e. g.: beginning of control at 200 bar.

Characteristic HA2

Operating pressure p [bar]

3

to V

(sizes 28 to

g max

Pressure increase

Schematic HA2

Sizes 28 to 160

Δp ≤ 100 bar

Size 250

Beginning of control

setting range

Sizes 28 to 16 0
Size 250

Displacement

20/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

B

A

M

1

T

2

T

1

V

g min

V

g max

X

G

M

B

B

V

g max

V

g min

G

M

X

T

1

A

T

2

M

A

B

A

M

1

T

2

T

1

G

X

V

g min

V

g max

HA – Automatic control high-pressure related

HA.T

Override hydraulic remove control,
proportional

With the HA.T control, the beginning of control can be influ­enced by applying a pilot pressure to port X.

For each 1 bar of pilot pressure increase, the beginning of con­trol is reduced by 17 bar (sizes 28 to 160) or 8 bar (size 250).

Example (sizes 28 to 160):

Beginning of control setting 300 bar 300 bar

Pilot pressure at port X 0 bar 10 bar

Beginning of control at 300 bar 130 bar

Note

Maximum permissible pilot pressure 100 bar.

Schematic HA1.T

Sizes 28 to 160

Schematic HA1.T

Size 250

Schematic HA2.T

Sizes 28 to 160

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 21/40

M

B

V

g min

V

g max

G

T

1

A

T

2

M

A

M

X

1

X

2

M

ST

B

DA – Automatic control speed-related

The variable motor A6VE with automatic speed-related control,
is intended for use in hydrostatic travel drives in combination
with the variable pump A4VG with DA control.

A drive-speed-related pilot pressure signal is generated by the
A4VG variable pump, and that signal, together with the operat­ing pressure, regulates the swivel angle of the hydraulic motor.

Increasing pump speed, i.e. increasing pilot pressure, causes
the motor to swivel to a smaller displacement (lower torque,
higher speed), depending on the operating pressure.

If the operating pressure exceeds the pressure setpoint set on
the controller, the variable motor swivels to a larger displace­ment (higher torque, lower speed).

Pressure ratio p

St/pHD

: 3/100, 5/100

DA closed loop control is only suitable for certain types of
drive systems and requires review of the engine and vehicle
parameters to ensure that the motor is used correctly and that
machine operation is safe and efficient. We recommend that all
DA applications be reviewed by a Bosch Rexroth application
engineer.

Detailed information is available from our sales department and
on the Internet at www.boschrexroth.com/da-control.

Note

The beginning of control and the DA characteristic are influ­enced by case pressure. An increase in case pressure causes
a decrease in the beginning of control (see page 5) and thus a
parallel shift of the characteristic.

DA
Hydraulic travel direction valve

Dependent on the direction of rotation (travel direction), the
travel direction valve is switched by using pilot pressures con­nections X

Direction of rotation Operating pressure in Pilot pressure in

cw A X

ccw B X

Schematic DA

Size 250

or X2.

1

1

2

22/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

T

2

T

1

M

1

V

g min

V

g max

B

A

G

X

3

a

b

X

1

DA – Automatic control speed-related

DA3
Electric travel direction valve +
electric V

The travel direction valve is either spring offset or switched by
energizing switching solenoid a, depending on the direction of
rotation (travel direction).

When the switching solenoid b is energized, the DA control is
overridden and the motor swivels to maximum displacement
(high torque, lower speed) (electric V

Technical data, solenoid a with Ø37

(travel direction valve)

Voltage

Direction of
rotation

ccw B

cw A energized

Nominal resistance (at 20 °C) 21.7 Ω

Nominal power 26.5 W

Minimum required current 0.67 A

Duty cycle 100 %

Type of protection see connector design page 28

g max

Operating
pressure in

-circuit

-circuit).

g max

DA3

24 V (±20 %)

de-energized

Schematic DA3

Sizes 28 to 160

Technical data, solenoid b with Ø37

(electric override)

DA3,

Voltage

No override

Displacement V

g max

24 V (±20 %)

de-energized

energized

Nominal resistance (at 20 °C) 21.7 Ω

Nominal power 26.5 W

Minimum required current 0.67 A

Duty cycle 100 %

Type of protection see connector design page 28

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 23/40

K 1.1

K1.2

K1

K2.1

K2

A3

B3

A2

V1

V
N
R

24 V DC

24 V DC

b

a

b
a

Electric travel direction valve (for DA)

Application in travel drives in closed circuits. The travel direc­tion valve of the motor is actuated by an electric signal that
also switches the swivel direction of the travel drive pump
(e. g. A4VG with DA control valve).

If the pump in the closed circuit is switched to the neutral posi­tion or into reverse, the vehicle may experience jerky decelera­tion or braking, depending on the vehicle's mass and current
travel speed.

When the travel direction valve of the pump (e. g. 4/3-direc­tional valve of the DA-control) is switched to

the neutral position, –
the electric circuitry causes the previous signal on the travel
direction valve on the motor to be retained.

reversing, –
the electric circuitry causes the travel direction valve on the
motor to switch to the other travel direction following a time
delay (approx. 0.8 s) with respect to the pump.

As a result, jerky deceleration or braking is prevented in both
cases.

Schematic - electric travel direction valve

Travel direction
valve

Solenoid a
Pump

DA3 control (see page 22)

Solenoid b
Pump

Solenoid a
Motor

Note

The shown diodes and relays are not included in the delivery of
the motor.

24/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

T2

T1

2

1

T (T )

T

2

T

1

Y

1

M

G

X

Y

1

M

B

A

X

G

A9

ø340

30

M16

30

270

105.5105.5

ø22

1)

ø300

A16

A29

øA6

A7

A2

A8

A28

A4

øA18

øA19

øA20

øA17

12 30'

A1

A3

A10

A 11

A27

A12

A13

A15

A21

A22

A25

A24

øA23

A26

A 14

Dimensions

HD1, HD2 – Proportional control hydraulic

Port plate 02 – SAE flange port A and B at side, opposite

(to shaft collar)

Groove for
O-ring

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

For dimensions of control devices, see data sheet
for variable motor A6VM (RE 91604)

Sizes 28 to 160

Differential dimension of mounting
flange A6VM to A6VE

View

Ports

Size Service line port A, B

28 3/4 in M18 x 1.5; 12 deep
55 3/4 in M18 x 1.5; 12 deep
80 1 in M18 x 1.5; 12 deep

107 1 in M18 x 1.5; 12 deep

160 1 1/4 in M26 x 1.5; 16 deep

250 1 1/4 in M22 x 1.5; 14 deep

Hole ø22 with spot face ø48; 2 deep

1)

1x plugged2)
Observe the general instructions on page 3) 40 for the maximum tightening torques.

For further ports, see variable motor A6VM (RE 91604)!

SAE J518

Drain port T1; T
DIN 3852

2)

2

3)

Size 250

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 25/40

W6

W5

W1

øW4

W2

W3

Dimensions

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

Standard flange L (sizes 28 to 160), M (size 250)

NG A1 A2 A3 A4 øA6 A7 A8 A9 (DIN 13)

91 20 47 10 ø19 50.8 23.8 M10 x 1.5; 17 deep 88 54 — 15 14 R10

28

123 24 77 14 ø19 50.8 23.8 M10 x 1.5; 17 deep 91 50 22 15 16 R6

55

129 28 78 16 ø25 57.2 27.8 M12 x 1.75; 17 deep 109.5 65 30 15 18 R10

80

137 30 84 18 ø25 57.2 27.8 M12 x 1.75; 17 deep 121.8 72 35 15 18 R12

107

171 34 10 9 20 ø32 66.7 31.8 M14 x 2; 19 deep 122 67 29 15 20 R5

160

204 44 103 20 ø32 66.7 31.8 M14 x 2; 19 deep 131.5 – – 14

250

NG A163)A17 A18 A19 A20 A21 A22 øA23 A24 A25 A26 A27 A28 A29 O-ring

28

55
80
107
160
250

89 13 5

92 16 0

110.5 19 0

122.8 200

123 200

133.5 260

110 – 86 188 16 0 ø13.5 62.5 62.5 142 64 35.5 132 126x4

-0.025

139 132 104 235 200 ø17 72.5 72.5 16 6 59 35.5 152 150x4

-0.025

151 143 116 260 224 ø21 78.5 78.5 19 8 79 35.5 164 182x4

-0.029

168 16 0 132 286 250 ø21 86.5 86.5 210 82 40.5 18 0 192x4

-0.029

188 18 0 146 286 250 ø21 98.5 98.5 210 83 40.5 204 192x4

-0.029

230 – – – – – – – – 83.5 48.5 224 250x5

-0.081

2)

A10 A11 A12 A13 A14 A15

1)

–

25

4)

Adapter flange U (size 107)

NG A1 A2 A3 A4 A5 A6 A7 A8 A9 (DIN 13)

150 30 96 18 15.5 25 57.2 27.8 M12 x 1.75; 17 deep 109.5 59.7 22.7 18 15

107

2)

A10 A11 A12 A13 A14

NG A15 A16 A17 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27 A28 A29 O-ring

R8 110.5 19 0

107

168 16 0 132 260 224 22 86.5 86.5 19 8 91.5 13.8 70 182x4

-0.025

4)

Drive shafts

NG Splined shaft DIN 5480 W1

28

55

80

107

160

250

1)

A (W30x2x14x9g)
Z (W30x2x14x9g)
A (W40x2x18x9g)
Z (W40x2x18x9g)
A (W50x2x24x9g)
Z (W50x2x24x9g)

Hole ø22 with spot face ø48; 2 deep
Observe the general instructions on page 2) 40 for the maximum tightening torques.
To shaft collar

3)

The O-ring is not included in the delivery contents4)
Center bore according to DIN 332 (thread according to DIN 13)5)

2)5)

W2 W3 øW4 W5 W6

M10 x 1.5 7.5 22 ø35 27 35

M12 x 1.75 9.5 28 ø45 27 35

M16 x 2 12 36 ø50 37 45

M12 x 1.75 9.5 28 ø60 37 45

M16 x 2 12 36 ø70 44 55

M16 x 2 12 36 ø60 49 58

26/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

B15

B18

B19

B17

B13

øB14

B16

B2

B1

B7

B8

B4 B20

B5 B6

B9

B10

B3

B12

B11

Y

X

Bre

M

A

M

B

S

Y

Z

T2(T1)

Bre

(X)

S

Z

A

B

T1

Bri

T2

Dimensions

HA3 – Automatic control high-pressure related

Port plate 22 – SAE flange port A and B at bottom, with integrated counterbalance valve

View View

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

Ports

NG B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 (DIN 13)

192 144 127 144 117 37 133 91 83 85 64 259 50.8 19 M10 x 1.5; 17 deep 23.8 80

55

198 150 13 6 162 132 40 138 93 83 90 69 259 57.2 25 M12 x 1.75; 17 deep 27.8 86

80

202 161 13 9 171.5 143 40 144 99 85 96 72 259 57.2 25 M12 x 1.75; 17 deep 27.8 86

107

240 19 5 152 197 162 47 177 128 102 10 8 78 259 66.7 32 M14 x 2; 19 deep 31.8 94

160

NG B18 B19 B20 Service line port A, B

55 74 51 102 3/4 in M18 x 1.5; 12 deep M22 x 1.5; 14 deep
80 90 53 114 1 in M18 x 1.5; 12 deep M22 x 1.5; 14 deep
107 96 58 122 1 in M18 x 1.5; 12 deep M22 x 1.5; 14 deep
160 94 65 13 6 1 1/4 in M26 x 1.5; 16 deep M27 x 2; 16 deep

1)

1x plugged
Observe the general instructions on page 42) 0 for the maximum tightening torques.

Note:

Port plate HZ3 and HA3 are not identical!

2)

1)

; T

SAE J518

Drain port T
DIN 3852

2)

1

2

Infeed S
DIN 3852

2)

B16 B17

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 27/40

Dimensions

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

Ports

Designa-

Port for Standard5)Size

tion

X Pilot signal

ISO 6149 M14 x 1.5; 11.5 deep 10 0 O

(open with HZ and HA3T, plugged with HA3)

M

A, MB

Measuring stroking chamber DIN 3852 M14 x 1.5; 11.5 deep 420 X
Bre Brake release, external DIN 3852 M14 x 1.5; 11.5 deep 30 O/X
Bri Brake release, internal

– ø4 30 X/O

(not provided on versions with flange U)

Observe the general instructions on page 1) 40 for the maximum tightening torques.
Momentary pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and

2)

fittings.
Only dimensions according to SAE J518, metric fastening thread is a deviation from standard.

3)

Depending on installation position, T4)
The spot face can be deeper than specified in the appropriate standard.

5)

or T2 must be connected (see also installation instructions on page 39).

1

Must be connected for external piping. Is plugged with internal ducting.6)
Is plugged with external ducting. Must be connected with internal piping.7)
O = Must be connected (plugged on delivery)

8)

X = Plugged (in normal operation)

1)

Maximum
pressure [bar]

State

2)

8)

6)

7)

28/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

ø37

68.5

50

36.7

(2)

(1)

36.7

40

68.5

ø45

50

(2)

(1)

65.4

(2)

(1)

ø37

68.5

50

Connector for solenoids

DEUTSCH DT04-2P-EP04

Sizes 28 to 160

Molded, 2-pin, without bidirectional suppressor diode

There is the following type of protection with mounted mating
connector:
IP67 __________________________________ DIN/EN 60529

and IP69K _______________________________ DIN 40050-9

Circuit symbol

Mating connector

DEUTSCH DT06-2S-EP04
Bosch Rexroth Mat. No. R902601804

Consisting of: DT designation

– 1 housing ____________________________ DT06-2S-EP04

– 1 wedge ______________________________________ W2S

– 2 sockets ___________________________ 0462-201-16141

The mating connector is not included in the delivery contents.
This can be supplied by Bosch Rexroth on request.

For EZ3, EZ4

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

HIRSCHMANN DIN EN 175 301-803-A/ISO 4400

Size 250

Without bidirectional suppressor diode

There is the following type of protection with mounted mating
connector:
IP65 ________________________________DIN/EN 60529

The seal ring in the cable fitting is suitable for line diameters of

4.5 mm to 10 mm.

The HIRSCHMANN connector is included in the delivery contents
of the motor.

Mounting bolt M3
Tightening torque

M

= 0.5 Nm

A

Changing connector orientation

If necessary, you can change the connector orientation by turn­ing the solenoid housing.

To do this, proceed as follows:

1. Loosen the mounting nut (1) of the solenoid. To do this, turn
the mounting nut (1) one turn counter-clockwise.

2. Turn the solenoid body (2) to the desired orientation.

3. Retighten the mounting nut. Tightening torque: 5+1 Nm.

(WAF26, 12-sided DIN 3124)

On delivery, the connector orientation may differ from that
shown in the brochure or drawing.

Cable fitting M16x1.5
Tightening torque

M

= 1.5 - 2.5 Nm

A

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 29/40

G

T

2

T

1

B

A

V

g min

V

g max

M

1

T

1

T

2

B

M

B

V

g min

B

1

A

M

A

A

1

V

g max

Flushing and boost pressure valve

The flushing and boost pressure valve is used to remove heat
from the hydraulic circuit.

In an open circuit, it is used only for flushing the housing.

In a closed circuit, it ensures a minimum boost pressure level in
addition to the case flushing.

Hydraulic fluid is directed from the respective low pressure
side into the motor housing. This is then fed into the reservoir,
together with the case drain fluid. The hydraulic fluid, removed
out of the closed circuit must be replaced by cooled hydraulic
fluid from the boost pump.

The valve is mounted onto the port plate or integrated (depend­ing on the control type and size).

Cracking pressure of pressure retaining valve

(observe when setting the primary valve)
fixed setting _____________________________________16 bar

Switching pressure of flushing piston Δp _________ 8±1 bar

Flushing flow q

v

Orifices can be used to set the flushing flows as required.
Following parameters are based on:
Δp

= p

ND

(p

ND

Size Flushing flow

28, 55

80

107

160

250

– pG = 25 bar and ν = 10 mm2/s

ND

= low pressure, pG = case pressure)

q

[L/min]

V

3.5 R909651766

5 R909419695

8 R909419696

10 R909419697

10 R909419697

Mat. No. of orifice

With sizes 28 to 160, orifices can be supplied for flushing
flows from 3.5 to - 10 L/min. For other flushing flows, please
state the required flushing flow when ordering. The flushing
flow without orifice is approx. 12 to 14 L at low pressure

= 25 bar.

Δp

ND

Schematic EP

Sizes 28 to 160

Flushing piston

Flushing orifice

Pressure
retaining valve

Schematic

Size 250

Flushing orifice

Flushing piston

Pressure
retaining valve

30/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

A1 A4

A3

A2

273 318

Flushing and boost pressure valve

Dimensions

Sizes 28 to 160

HA1
HA2

NG A1 A2 A3 A4

28 152 125 161 –

55 182 133 17 6 17 6

80 194 14 1 192 17 6

107 (L flange)

107 (U flange)

160 245 154 220 –

204 143 202 18 6

217 143 202 19 9

HD, HZ1
EP, EZ1
EZ2, DA

HA3
HZ3
EZ3
EZ4

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

Size 250

HD, HZ, EP,
EZ, DA

HA

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 31/40

B´

A

M

1

T

2

T

1

V

g min

V

g max

X

G

M

B

M

A

S

G

ext

G´

L´

A´

B

Counterbalance valve BVD and BVE

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

Function

Travel drive/winch counterbalance valves are designed to reduce the danger of overspeeding and cavitation of axial piston motors
in open circuits. Cavitation occurs if the motor speed is greater than it should be for the given input flow while braking, travelling
downhill, or lowering a load.

If the inlet pressure drops, the counterbalance spool throttles the return flow and brakes the motor until the inlet pressure returns
to approx. 20 bar.

Note

BVD available for sizes – 55 to 160 and BVE available for sizes 107 and 160.

The counterbalance valve must be ordered additionally. We recommend ordering the counterbalance valve and the motor as a –
set. Ordering example: A6VE80HA1T/63W–VAL38800A + BVD20F27S/41B–V03K16D0400S12

For safety reasons, controls with beginning of control at V –

The counterbalance valve does not replace the mechanical service brake and park brake. –

Observe the detailed notes on the BVD counterbalance valve in RE 95522 and BVE counterbalance valve in RE 95525 –

For the design of the brake release valve, we must know for the mechanical park brake: –

the pressure at the start of opening -

the volume of the counterbalance spool between minimum - stroke (brake closed) and maximum stroke (brake released with
21 bar)

the required closing time for a warm device (oil viscosity approx. 15 mm -

(e. g. HA) are not permissible for winch drives!

g min

2

/s)

Travel drive counterbalance valve BVD...F

Application option

Travel drive on wheeled excavators –

Example schematic for travel drive for wheeled excavators
A6VE80HA1T/63W–VAL38800A + BVD20F27S/41B–V03K16D0400S12

Pump, directional valve,
not included in the delivery
contents

Counterbalance valve
BVD

Variable motor
A6VE...HA1T

32/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

T

2

T

1

M

1

V

g min

V

g max

B

A

G

X

M

P1

V

G

V

F

S

G

ext

M

k

D

C

D´

C´

G´

L´

D

1

D

2

M

B

M

A

Counterbalance valve BVD and BVE

Winch counterbalance valve BVD...W and BVE

Application options

Winch drive in cranes (BVD and BVE) –

Track drive in excavator crawlers (BVD) –

Example schematic for winch drive in cranes
A6VE80HD1D/63W–VAL38800B + BVE25W38S/51ND-V100K00D4599T30S00-0

Pump, directional valve,
not included in the
delivery contents

Counterbalance valve
BVE

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

Variable motor
A6VE...HD1D

Winch with
mechanical
park brake

Permissible input flow or pressure in operation with DBV and BVD/BVE

Without valve Restricted values in operation with DBV and BVD/BVE

Motor DBV BVD/BVE

qV

NG p

nom/pmax

[bar]

max

[L/min]

NG

55 400/450 244 22 350/420 240 380 20
80 312
107 380 32 400 370 378
107 380 380 25
160 496
250 350/400 675 On request

DBV _______________________________ pressure-relief valve

BVD __________________counterbalance valve, double-acting

BVE _____________________ counterbalance valve, one-sided

p

nom/pmax

[bar]

qV
[L/min]

Code NG

(BVD)

(BVD/BVE)

p

nom/pmax

[bar]

350/420 220 388

qV

Code

[L/min]

320 388

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 33/40

A2

A1

MB, (MA)

A, B

A4

A3

S

A8

A6 A5

A7

B

A

G

ext

A2

A9

MB, (MA)

A4

A10

Br

S

A8

A5 A6

A7

B

A

A, B

Counterbalance valve BVD and BVE

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

Dimensions

A6VE...HA1/2

A6VE...HD or EP

A6VE Counterbalance valve
NG...plate Type Ports Dimensions

A, B A1 A2 A3 A4 A5 A6 A7 A8 A9 A10

55...38 BVD20...17 3/4 in 252 243 143 50 98 13 9 75 222 267 50

80...38 BVD20...27 1 in 261 252 148 55 98 139 75 222 276 46

107...37 BVD20...28 1 in 280 271 152 59 98 13 9 84 234 295 41

107...38 BVD25...38 1 1/4 in 298 288 16 5 63 120.5 17 5 84 238 311 56

160...38 BVD25...38 1 1/4 in 334 324 17 0 68 120.5 17 5 84 238 349 51

107...38 BVE25...38 1 1/4 in 298 288 17 1 63 137 214 84 238 315 63

160...38 BVE25...38 1 1/4 in 334 324 17 6 68 137 2 14 84 238 349 59

1)

Ports

Designation Port for Version A6VE

Standard Size

Plate

A, B Service line SAE J518 see table above 420 O
S Infeed BVD20

BVD25, BVE25

Br Brake release,

L 7

reduced high-pressure

G

M

ext

A, MB

Brake release,
high-pressure

Measuring pressure

S

DIN 3852

DIN 3852

DIN 3852

8

DIN 3852

DIN 3852

ISO 6149

4)

4)

4)

4)

4)

4)

A and B

At the mounting version for the controls

1) HD and EP, the cast-in port designations A and B on the counterbalance valve BVD do

not correspond with the connection drawing of the A6VE motor.
The designation of the ports on the installation drawing of the motor is binding!
Observe the general instructions on page

2) 40 for the maximum tightening torques.

Momentary pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and

3)

fittings.
The spot face can be deeper than specified in the appropriate standard.

4)

O = Must be connected (plugged on delivery) 5)
X = Plugged (in normal operation)

2)

Maximum
pressure [bar]

3)

M22 x 1.5; 14 deep 30 X

M27 x 2; 16 deep 30 X
M12 x 1.5; 12.5 deep 30 O

M12 x 1.5; 12 deep

30 O

M12 x 1.5; 12.5 deep 420 X

M18 x 1.5; 14.5 deep 420 X

State

5)

34/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

B1

B2

B3

1)

B4

2)

8 5

1

4

267

3

2)

Counterbalance valve BVD and BVE

Mounting the counterbalance valve

When delivered, the counterbalance valve is mounted to the
motor with two tacking screws (transport protection). The
tacking screws may not be removed while mounting the service
lines. If the counterbalance valve and motor are delivered
separately, the counterbalance valve must first be mounted to
the motor port plate using the provided tacking screws. The
counterbalance valve is finally mounted to the motor by screw­ing on the SAE flange with the following screws:

6 screws (1, 2, 3, 4, 5, 8) ______________ length B1+B2+B3
2 screws (6, 7) __________________________ length B3+B4

Tighten the screws in two steps in the specified sequence from
1 to 8 (see following scheme).

In the first step, the screws must be tightened with half the
tightening torque, and in the second step with the maximum
tightening torque (see following table).

Thread Strength

class

M6 x 1 (tacking screw) 10.9 15.5
M10 x 1.5 10.9 75
M12 x 1.75 10.9 130
M14 x 2 10.9 205

Tightening
torque [Nm]

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

SAE flange1)
Tacking screw (M6 x 1, length = B1 + B2, DIN 912)2)

NG...plate 55...38 80...38,

107...37

3)

B1

M10 x 1.5
17 deep

M12 x 1.75

15 deep
B2 68 68 85
B3 customer-specific
B4 M10 x 1.5

15 deep

Minimum required thread reach 1 x Ø-thread

3)

M12 x 1.75

16 deep

107...38,

160...38

M14 x 2
19 deep

M14 x 2
19 deep

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 35/40

Counterbalance valve integrated BVI

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

Function

The integrated counterbalance valve is designed to reduce the danger of overspeeding and cavitation of axial piston motors in
open circuits. Cavitation occurs if the motor speed is greater than it should be for the given input flow while braking or traveling
downhill.

Note

The integrated counterbalance valve must be ordered – additionally, see ordering code below.

The counterbalance valve does not replace the mechanical service brake and park brake. –

For the design of the brake release valve, we must know for the mechanical park brake: –

the pressure at the start of opening -

the volume of the counterbalance spool between minimum - stroke (brake closed) and maximum stroke (brake released with
21 bar)

the required closing time for a warm device (oil viscosity approx. 15 mm -

2

/s)

Application options

Track drive in excavator crawlers –

Ordering code

BVI 00 –

01 02 03 04 05 06

Counterbalance valve

01

Counterbalance valve integrated

Brake piston version qv [L/min] Material number

Volume preselected

≤ 150 R902038832

= 150 – 210 R902038936

02

= 210 – 270 R902038833

= 270 – 330 R902038834

= 330 – 400 R902038835

≥ 400 R902038836

Throttle mounting Material number

Constant throttle

03

Throttle pin

R909432302

R909651165

Check valve

04

Without residual opening

Brake release valve

With brake release valve
(standard with HZ)

05

With brake release valve
(standard with HA)

Without disable function

With disable function

BVI

51

52

53

54

55

56

0008

0603

00

1

2

Standard / special version

Standard version

06

Special version

0

S

36/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

10

5

15

0

50

100

150

200 250

10

5

15

0

100 200 300 400

Counterbalance valve integrated BVI

Table of values

Operating pressure

Flow, maximum q

Counterbalance spool start of opening p bar 12

Pressure-reducing valve for brake release
(fixed setting)

Comparison between port plates 02 and 22

Maximum permissible input flow with restricted nominal pressure 350 bar, maximum pressure 420 bar

Without restrictions
standard plate (02)

Motor with BVI + DBV
NG p

nom/pmax

[bar] qV

max

[L/min]

55 400/450 276 22 350/420 240
80 332
107 410
160 533 400

Restricted values
plate with integrated counterbalance
valve (22)

Code p

nominal pressure p bar 350

peak pressure p bar 420

v max

L/min 400

fully open p bar 26

control pressure p bar 21

beginning of control p bar 10

nom/pmax

[bar] qV

[L/min]

+4

+4

Infeed characteristic M22 x 1.5

Pressure difference Δp [bar]

Flow qV [L/min]

Infeed characteristic M27 x 2

Pressure difference Δp [bar]

Flow qV [L/min]

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 37/40

B

Bre

A

M

B

M

A

S

X

T

2

T

1

Bri

V

g min

V

g max

XM

1

T

2

T

1

Bri

V

g min

V

g max

B

Bre

A

M

B

M

A

S

M

B

M

A

S

XM

1

T

2

T

1

Bri

V

g min

V

g max

B

Bre

A

Counterbalance valve integrated BVI

Schematic HZ3

Schematic HA3

Schematic HA3.T

38/40 Bosch Rexroth AG

A6VE Series 63

RE 91606/06.12

T

1

U

n

A-A

A

A

B

30°

30°

C

A

Speed sensor

Version A6VE...U ("prepared for speed spensor", i.e. without
sensor) is equipped with a toothed ring on the rotary group.

On deliveries "prepared for speed sensor", the port is plugged
with a pressure-resistant cover.

With the speed sensor DSA mounted, a signal proportional
to motor speed can be generated. The sensor measures the
speed and direction of rotation.

Ordering code, technical data, dimensions and details on the
connector, plus safety instructions about the sensor can be
found in the relevant data sheet (DSA – RE 95133).

The sensor is mounted on the port provided for this purpose
with a mounting bolt.

We recommend ordering the A6VE variable motor complete
with installed sensor.

Schematic

Before finalizing your design, request a binding
installation drawing. Dimensions in mm.

Dimensions

Version "V" with mounted speed sensor

NG 55 80 107 160 250

Number
of teeth

A 32 32 32 32 on request
B 83.3 87.3 96.3 104.3 on request
C 26 16.5 14.2 28.5 on request

54 58 67 75 86

RE 91606/06.12 A6VE Series 63

Bosch Rexroth AG 39/40

T

1

T

2 ,T1

h

t min

h

min

T

2

1

U

h

t min

h

min

T

2 ,T1

T

2

T

2 ,T1

h

t min

h

min

T

2 ,T1

L

1

h

t min

h

min

T

2 ,T1

L

1

h

t min

h

min

T

2 ,T1

L

1

h

t min

h

min

Installation instructions

General

During commissioning and operation, the axial piston unit must
be filled with hydraulic fluid and air bled. This must also be
observed following a relatively long standstill as the axial piston
unit may drain back to the reservoir via the hydraulic lines.

The case drain fluid in the motor housing must be directed to
the reservoir via the highest available drain port (T

, T2).

1

For combinations of multiple units, make sure that the respec­tive case pressure in each unit is not exceeded. In the event of
pressure differences at the drain ports of the units, the shared
drain line must be changed so that the minimum permissible
case pressure of all connected units is not exceeded in any
situation. If this is not possible, separate drain lines must be
laid if necessary.

To achieve favorable noise values, decouple all connecting
lines using elastic elements and avoid above-reservoir installa­tion.

In all operating conditions, the drain line must flow into the
reservoir below the minimum fluid level.

Installation position

See the following examples 1 to 6.
Further installation positions are possible upon request.

Recommended installation positions: 1 and 2.

Note

In certain installation conditions, an influence on the control
characteristics can be expected. Gravity, dead weight and
case pressure can cause minor shifts in control characteristics
and changes in response time.

Installation position Air bleed Filling

1 – T

2 – T2, T

3 – T2, T

4 L

5 L

6 L

1

1

1

, T

2

1

1

1

T2, T1 (L1)

T2, T1 (L1)

T2, T1 (L1)

Below-reservoir installation (standard)

Below-reservoir installation means that the axial piston unit is
installed outside of the reservoir below the minimum fluid level.

1 2

3

Above-reservoir installation

Above-reservoir installation means that the axial piston unit is
installed above the minimum fluid level of the reservoir.

4 5

L
T

h

h

Filling / air bleed

1

Drain port

1, T2

Minimum required immersion depth (200 mm)

t min

Minimum required spacing to reservoir bot-

min

6

tom (100 mm)

40/40 Bosch Rexroth AG

General instructions

A6VE Series 63

RE 91606/06.12

The – motor A6VE is designed to be used in open and closed
circuits.

The project planning, installation and commissioning of the –
axial piston unit requires the involvement of qualified person­nel.

Before using the axial piston unit, please read the corre- –
sponding instruction manual completely and thoroughly. If
necessary, these can be requested from Bosch Rexroth.

During and shortly after operation, there is a risk of burns on –
the axial piston unit and especially on the solenoids. Take
appropriate safety measures (e. g. by wearing protective
clothing).

Depending on the operating conditions of the axial piston –
unit (operating pressure, fluid temperature), the characteris­tic may shift.

Service line ports: –

The ports and fastening threads are designed for the speci- ­fied maximum pressure. The machine or system manufac­turer must ensure that the connecting elements and lines
correspond to the specified application conditions (pres­sure, flow, hydraulic fluid, temperature) with the necessary
safety factors.

The service line ports and function ports can only be used ­to accommodate hydraulic lines.

The data and notes contained herein must be adhered to. –

The product is not approved as a component for the safety –
concept of a general machine according to ISO 13849.

The following tightening torques apply: –

Fittings: ­Observe the manufacturer's instruction regarding tighten­ing torques for the fittings used.

Mounting bolts: ­For mounting bolts with metric ISO threads according to
DIN 13, we recommend checking the tightening torque in
individual cases in accordance with VDI 2230.

Female threads - in the axial piston unit:
The maximum permissible tightening torques M

G max

are
maximum values for the female threads and must not be
exceeded. For values, see the following table.

Threaded plugs: ­For the metallic threaded plugs supplied with the axial pis­ton unit, the required tightening torques of threaded plugs
M

apply. For values, see the following table.

V

Ports

Maximum permissible
tightening torque of the

Standard Size of thread

DIN 3852

M12 x 1.5 50 Nm 25 Nm

female threads M

M14 x 1.5 80 Nm 35 Nm 6 mm
M16 x 1.5 100 Nm 50 Nm 8 mm
M18 x 1.5 140 Nm 60 Nm 8 mm
M22 x 1.5 210 Nm 80 Nm 10 mm
M26 x 1.5 230 Nm 120 Nm 12 mm
M27 x 2 330 Nm 135 Nm 12 mm
M33 x 2 540 Nm 225 Nm 17 mm
M42 x 2 720 Nm 360 Nm 22 mm

The tightening torques apply for screws in the "dry" state as

1)

received on delivery and in the "lightly oiled" state for instal­lation.
In the "lightly oiled" state, the

2) M

is reduced to 17 Nm for

V

M12 x 1.5.

Bosch Rexroth AG
Mobile Applications
Glockeraustrasse 4
89275 Elchingen, Germany
Tel.: [phone]
Fax: [phone]
[e-mail]
www.boschrexroth.com/axial-piston-motors

An den Kelterwiesen 14
72160 Horb, Germany
Tel.: [phone]
Fax: [phone]

G max

Required
tightening torque of the
threaded plugs M

2)

© This document, as well as the data, specifications and other information set
forth in it, are the exclusive property of Bosch Rexroth AG. It may not be repro­duced or given to third parties without its consent.

The data specified above only serve to describe the product. No statements
concerning a certain condition or suitability for a certain application can be de­rived from our information. The information given does not release the user from
the obligation of own judgment and verification. It must be remembered that our
products are subject to a natural process of wear and aging.

Subject to change.

1)

V

WAF
hexagon socket of the
threaded plugs

6 mm