Sheffer AA User Manual

AA SERIES

Light-Duty Aluminum
Pneumatic Cylinders
Pressure Rating 200 PSI

Accurately machined from aluminum
bar stock and black anodized for
protection and attractive appearance.

Piston rods have a minimum expected
yield of 100,000 psi. They are ground,
polished, and hard chrome plated for
wear and corrosion resistance. Four
wrench flats are standard.

The tube is a high tensile, special
Aluminum alloy with a hard anodized
finish. The file-hard finish offers long
life and amazing lubrication holding
properties.

Maximum strength is obtained through
a prestressed tie rod assembly. The use
of tie rods eliminates axial loading of
the tube.
Pistons are machined from a fine grain

alloy cast iron. They are of one piece
design to give full thickness bearing and
engineered for fast, positive inflation of
seals.

Static seals at tube ends are confined,
precision cut gaskets.

Modified U-cup seals are Buna-N
compound. They are self-adjusting to
pressure and wear and their design
permits simple replacement — no need
to disassemble the piston from the
piston rod.
The replaceable rod bearing is made of

oil impregnated sintered bronze for
lubricated long life.

Synthetic wiper, steel encased, is

designed to wipe off abrasive dust and
contaminates on the retract stroke to
insure long life for seals, rod bearing,
and piston rod. This type of wiper is
efficient, has low friction, and can be
replaced without disassembly of the
cylinder.

Modified U-cup design offers long life
with minimum friction. It is self­adjusting to pressure and wear. Seal
material is a standard Buna-N com­pound. The rod seal can be replaced
without disassembly of the cylinder.

Adjusting screw is O-Ring sealed and
can be rotated to any position for easy
accessibility. When shipped, cushion
adjusting screws will be in positions 1
and 5 (as shown in illustration).
AA SERIES cylinders can be ordered

with no cushions, cushioned front,
cushioned rear, or cushioned both ends.

A modified U-cup gives positive sealing
during cushioning and free flow of air

for rapid acceleration out of cushion.
No check valve is needed.
Cushion insert sandwiched between the
tube and head (or cap) is sealed with a
pressure-activated

O-RING (16A).

11/2", 2" AND 21/2" BORE SIZE

Parts List

24

25

3

27

13

21

1

71

33

5

9 18

72

29

2

16B

30

31

4

29

16A

43 30

31

14

1,2

Head and Cap

3

Piston Rod

4

Tube

5

Tie Rods

9

Piston

16B

Tube End Seals

18

Piston Seals

21

Rod Bearings

24

Rod Wiper

71, 72

Cushion Insert

25

Rod Seal

30

Adjusting Screw

Tie Rod Tourque Chart

CYLINDER TORQUE IN

BORE FOOT LBS.

11/2 6

2 6

2

1

/2 10

33, 43

Cushions

33, 43

Cushion Seal

28

1

AA-1

Parts List

ITEM QUANTITY

NUMBER DESCRIPTION REQUIRED

1 HEAD AND BEARING ASSEMBLY 1
2 CAP 1
3 PISTON ROD 1
4 TUBE 1
5 TIE ROD 4

9 PISTON 1
13 SLEEVE NUT 4
14 PISTON ROD NUT 1
16A† TUBE SEAL—O-RING *
16B† TUBE SEAL—GASKET 2
18† PISTON SEAL 2
21 ROD BEARING 1
24† ROD WIPER 1
25† ROD SEAL 1
27 ROD SEAL SUPPORT WASHER 1
28 ROD SEAL RETAINING RING 1
29 CUSHION PISTON **
30 CUSHION ADJUSTING SCREW *
31† SEAL—CUSHION ADJUSTING *
33† CUSHION SEAL—FRONT *
43† CUSHION SEAL—REAR *
71 CUSHION INSERT—FRONT *
72 CUSHION INSERT—REAR *

†Recommended Spare Parts

*As required: Specify if cushioned front, cushioned rear or cushioned both ends.
**Used on all cushioned front cylinders. Used on cushioned rear cylinders bore sizes 11/2" and 2" only.

31

/32

9

/16

9

/16

1

/4 NPT

1

/2 DIA.

ROD

P + STROKE

ZJ + STROKE

SN +

STROKE

LB +

STROKE

1

1

15

/32

3

/4

7

/16-20

7

/16

WRENCH

FLATS

3

/8-16 1/2" DEEP ON 11/2" BORE, 5/8" DEEP ON

2, 2

1

/2" BORES (3) HOLES EACH HEAD

1

/4-28 5/16" DEEP ON HEAD, 1/2"

DEEP ON CAP (4) HOLES EACH HEAD

E/2

TN

TN

E

E

Dimensions for Cusioned Cylinders

Adding a cushion or cushions to a cylinder increases overall
length. A front cushion or rear cushion adds 1 inch to all plus
stroke dimensions. Cushioning a cylinder on both ends adds 2
inches to all plus stroke dimensions.

Double Rod End Cylinders

All dimensions shown below remain unchanged. Second rod
(not shown in dimension drawing) will extend from face of
head the total of the stroke plus 15/32" plus the threaded rod
end dimension.

BORE E LB* P* SN* TN ZJ*

11/2 2 27/8 17/8 13/4 17/16 311/32

2 21/2 27/8 17/8 13/4 127/32 311/32

21/2 3 3 2 17/8 23/16 315/32

*Plus Stroke Dimensions

Universal Mount

The basic cylinder is equipped with Universal Mounting Holes
that permit side flush mount, front head mount and rear head
mount. Using optional mounting kits, shown on Page AA-3,
complete versatility is achieved to satisfy any mounting
requirement and to do so economically.

TP-AA Trunnion Pin Assemblies thread into 3/8–16 holes on
sides of head.

NOTE: For Pivot and Clevis Bracket Mounts, use Mounting

Brackets dimensioned on Page AA-3. Use

1

/4

–28 Cap Screws

supplied to bolt brackets to rear head.

Front Flange, Rear Flange and Foot Bracket Mount use
Universal Mounting Brackets (See Page AA-3).

Affix brackets by using 3/8–16 holes on sides of head and
FMS-AA mounting screws.

Use 1/4–28 cap screws supplied to bolt brackets to each head
as shown.

Dimensions

AA-2