SCHUNK HSA Series, HSA 160, HSA 160/2, HSA 200, HSA 180/2 Assembly And Operating Manual

Translation of Original Operating Manual

Special chuck HSA 2-jaw chuck / 3-jaw chuck

HSA 160 (88001862, 88021732, 88029313, 88035481, 88037348, 88039738, 88036995)
HSA 160/2 (88026206, 88029240, 88036160, 88041389)
HSA-NZ 170/2 (88027365)
HSA 180/2 (88036423)
HSA 200 (88002843, 88002909, 88002958, 88004159, 88018669, 88020485, 88026696, 88028474,

88028566, 88039479, 88039429)

HSA 250 (88018463, 88018469, 88019551)
HSA 250/2 (88028004, 88034564)
HSA 265 (88003413, 88003473)
HSA 315 (88037992, 88040302)
HSA 315/2 (88029693)
HSA 400 (88026570)
HSA 630/2 (88019966)

Assembly and Operating Manual

Superior Clamping and Gripping

Imprint

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Imprint

Copyright:

This manual remains the copyrighted property of SCHUNK GmbH & Co. KG. It is solely
supplied to our customers and operators of our products and forms part of the product.
This documentation may not be duplicated or made accessible to third parties, in particu­lar competitive companies,
without our prior permission.

Technical changes:
We reserve the right to make alterations for the purpose of technical improvement.

Document number: 88040302-en
Edition: 02.00 |22/02/2016|en

© SCHUNK GmbH & Co. KG
All rights reserved.

Dear customer,
congratulations on choosing a SCHUNK product. By choosing SCHUNK, you have opted for

the highest precision, top quality and best service.
You are going to increase the process reliability of your production and achieve best

machining results – to the customer's complete satisfaction.
SCHUNK products are inspiring.
Our detailed assembly and operation manual will support you.
Do you have further questions? You may contact us at any time – even after purchase.

Kindest Regards

Your H.-D. SCHUNK GmbH & Co.
Spanntechnik KG

Lothringer Str. 23
D-88512 Mengen

Tel. [phone]
Fax [phone]

[e-mail]
www.schunk.com

Table of contents

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3

Table of contents

1

General .................................................................................................................... 4

1.1

Warnings ................................................................................................................... 4

1.2

Applicable documents .............................................................................................. 5

2

Basic safety notes ..................................................................................................... 6

2.1

Intended use ............................................................................................................. 6

2.2

Not intended use ...................................................................................................... 6

2.3

Notes on particular risks ........................................................................................... 7

2.4

Notes on safe operation ......................................................................................... 10

2.4.1

Substantial modifications ............................................................................ 13

2.5

Personnel qualification ........................................................................................... 13

2.6

Organizational measures ........................................................................................ 13

2.7

Using personal protective equipment .................................................................... 14

2.8

2-jaw chuck ............................................................................................................. 14

3

Warranty ................................................................................................................. 15

4

Torques per screw ................................................................................................... 15

5

Scope of delivery ..................................................................................................... 16

6

Technical data ......................................................................................................... 17

6.1

Calculation of the clamping force based on the speed: ......................................... 17

6.2

Grades of Accuracy ................................................................................................. 18

6.3

Permissible imbalance ............................................................................................ 18

7

Assembly ................................................................................................................. 19

7.1

Pre-assembly measures .......................................................................................... 19

7.2

Assembly of the HSA chuck .................................................................................... 19

8

Chuck function ........................................................................................................ 22

8.1

Functional principle ................................................................................................ 22

8.2

Replacement or renewal of jaws ............................................................................ 23

8.3

Disassembly and assembly of the Chuck ................................................................ 23

9

Maintenance ........................................................................................................... 26

9.1

Lubrication .............................................................................................................. 26

9.2

Maintenance intervals ............................................................................................ 26

9.3

Changing the top jaws ............................................................................................ 26

10

Disposal .................................................................................................................. 27

11

Parts lists ................................................................................................................. 28

12

Drawings ................................................................................................................. 30

General

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General

This operating manual is an integral component of the product and
contains important information on safe and proper assembly,
commissioning, operation, care, maintenance and disposal. This
manual must be stored in the immediate vicinity of the product
where it is accessible to all users at all times.

Before using the product, read and comply with this manual,

especially the chapter “Basic safety notes”.( 2, Page 6)

If the product is passed on to a third party, these instructions must
also be passed on.

Illustrations in this manual are provided for basic understanding of
the product and may differ from the actual product design.

We accept no liability for damage resulting from the failure to
observe and comply with this operating manual.

Warnings

To make risks clear, the following signal words and symbols are
used for safety notes.

DANGER

Danger for persons.

Non-compliance will inevitably cause irreversible injury or death.

WARNING

Dangers for persons.

Ignoring a safety note like this can lead to irreversible injury and
even death.

CAUTION

Dangers for persons.

Non-observance can cause minor injuries.

1

1.1

General

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5

NOTICE

Material damage

Information about avoiding material damage.

WARNING

Warning about hand injuries

WARNING

Warning about hot surfaces

Applicable documents

General terms of business
Calculation of the jaw centrifugal forces

("Technology" chapter in the lathe chuck catalog)

The above mentioned documents can be downloaded at

www.de.schunk.com.

1.2

Basic safety notes

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Basic safety notes

Improper handling, assembly and maintenance of this product may
result in risk to persons and equipment if this operating manual is
not observed.

Report any failures and damage immediately and repair without
delay to keep the extent of the damage to a minimum and prevent
compromising the safety of the product.

Only use original SCHUNK spare parts.

Intended use

The chuck is used to clamp workpieces on machine tools and other
suitable technical facilities, paying particular attention to the
technical data specified by the manufacturer. The technical data
specified by the manufacturer must never be exceeded.

The product is intended for industrial use.
Intended use also means that the user has read and understood

this operating manual in its entirety, especially the chapter “Basic
safety notes”.

The maximum RPM of the chuck and the required clamping force
must be determined by the user for the respective clamping task
based on the applicable standards and technical specifications of
the manufacturer.

(See also “Calculations for clamping force and RPM” in the chapter

“Technical data”). ( 6, Page 17)

Not intended use

The product is not being used as intended if, for example,

• It is used as a press, a punch, a chuck, a load-handling device or
as lifting equipment.

• It is used in working environments that are not permissible.

• Workpieces are not clamped properly, paying particular
attention to the clamping forces specified by the manufacturer.

• People work on machines or technical equipment that do
not comply with the EC Machinery Directive 2006/42/EC,
in violation of the applicable safety regulations.

2

2.1

2.2

Basic safety notes

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7

• The technical data for use of the product specified by the
manufacturer are exceeded.

Notes on particular risks

This product may pose a danger to persons and property if, for
example:

• It is not used as intended;

• It is not installed or maintained properly;

• The safety and installation instructions, local applicable
safety and accident prevention regulations or the EC Machinery
Directive are not observed.

DANGER

Possible risk of fatal injury to operating personnel due to the
workpiece falling down or being flung out in the event of a
power failure!

In the event of a power failure, the chuck's clamping force may
fail immediately and the workpiece may be released in an
uncontrolled manner. This poses a risk of death or injury to
the operating personnel and can result in serious damage to the
system.

• Due to the carried out and documented danger assessment
and risk evaluation, the machine manufacturer and its
operator have to ensure that appropriate measures have
been taken in order to maintain the clamping force of the
chuck until the machine's standstill, and to secure the
workpiece correspondingly (e.g. via a crane or a suitable
hoist).

• The machines and facilities must fulfill the minimum
requirements of the EC Machinery Directive 2006/42/EC;
specifically, they must have effective technical measures to
protect against possible mechanical hazards.

2.3

Basic safety notes

8

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DANGER

Possible risk of fatal injury to operating personnel if a jaw
breaks or if the chuck fails because the technical data have been
exceeded and a workpiece is released or parts fly off!

• The technical data specified by the manufacturer for using the
chuck must never be exceeded.

• The chuck may only be used on machines and facilities that
fulfill the minimum requirements of the EC Machinery
Directive 2006/42/EC; specifically, they must have effective
technical measures to protect against possible mechanical
hazards.

DANGER

Possible risk of fatal injury to operating personnel from clothing
or hair being caught on the chuck and being dragged into the
machine

Loose clothing or long hair may become caught on projecting
parts of the chuck and be drawn into the machine.

• The machines and facilities must fulfill the minimum
requirements of the EC Machinery Directive 2006/42/EC;
specifically, they must have effective technical measures to
protect against possible mechanical hazards.

• Always wear tight-fitting clothing and a hairnet when working
on the machine and the chuck.

WARNING

Risk of injury due to dropping the chuck during transport,
installation or removal.

• Take special care in the danger zone when transporting,
installing or removing the chuck.

• Note the relevant load securing regulations for working safely
with cranes, ground conveyors, lifting gear and load-handling
equipment.

Basic safety notes

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9

CAUTION

Danger of slipping and falling in case of dirty environment
where the chuck is used (e.g. by cooling lubricants or oil).

• Make sure the work environment is clean before beginning
assembly and installation tasks.

• Wear suitable safety shoes.

• Observe the safety and accident prevention regulations

during operation of the chuck, especially in connection with
machining centers and other technical equipment.

CAUTION

Danger of limbs being crushed by opening and closing of the
chuck jaws during manual loading and unloading or when
replacing moving parts.

• Do not reach between the jaws.

• Wear safety gloves.

• Observe the safety and accident prevention regulations

during operation of the chuck, especially in connection with
machining centers and other technical equipment.

CAUTION

Risk of burns due to workpieces with high temperatures.

• Wear protective gloves when removing the workpieces.

• Automatic loading is preferred.

CAUTION

Risk of damages due to incorrect choice of clamping position for
chuck jaws on workpiece.

If an incorrect clamping position is chosen for the chuck jaws on
workpiece, the base and the top jaws may be damaged.

• The T-nuts combine the top jaws with the base jaws and they
should never protude over the base jaws in radial direction.

• The outer diameter of the screwed top jaws must not exceed
the outer diameter of the chuck by more than 10%.

Basic safety notes

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CAUTION

Hazard from vibration due to imbalanced rotating parts and
noise generation.

Physical and mental strains due to imbalanced workpieces and
noise during the machining process on the clamped and rotating
workpiece.

• Ensure the chuck's axial and concentric runout.

• Check options for remedying imbalances on special top jaws

and workpieces.

• Reduce the speed.

• Wear hearing protection.

Notes on safe operation

• The machine spindle may only be started up when clamping
pressure has built up in the cylinder and clamping has followed
in the permitted work area.

• Unclamping may only be possible when the machine spindle
has come to a standstill.

• If the clamping energy fails, the workpiece must remain firmly
clamped until the spindle is shut down and the workpiece is
secured.

• The technical safety requirements in the respective operating
instructions must be observed exactly.

Functional test
After installation of the chuck, its function must be checked prior
to start-up.

Two important points are:

• Clamping Force! The clamping force of the chuck must be
achieved at max. operating force/pressure.

• Stroke control! The stroke of the clamping piston must allow a
safety zone at the front and rear end position. The machine
spindle may only be started when the clamping piston has
passed through the safety zone. Only limit switches that meet
the requirements for safety limit switches specified in DIN EN
60204-1 may be used.

2.4

Basic safety notes

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11

When determining the necessary clamping force to machine a
workpiece, take the centrifugal force acting on the chuck jaws into
account (according to VDI 3106).
If the chuck jaws are changed, adjust the stroke control to the new
situation.

Speed

DANGER

Possible risk of fatal injury to operating personnel if the chuck's
top speed is exceeded and a workpiece is released or parts fly
off.

If the machine tool or technical equipment can reach a higher
speed than the chuck's top speed, a reliable speed limiter must
be installed and proof must be provided that the speed limiter is
effective.

Maintenance instructions
The chuck's reliability and safety can only be guaranteed if the
operator complies with the manufacturer's maintenance
instructions.

• For lubrication, we recommend our tried and tested special
grease, LINO MAX. Unsuitable lubricants can have a negative
impact on the functioning of the chuck (clamping force,
coefficient of friction, wear characteristics).
(For product information about LINO MAX, see the
"Accessories" chapter of the SCHUNK lathe chuck catalog
or contact SCHUNK).

• Use a suitable high-pressure grease gun to ensure that you
reach all the greasing areas.

• To ensure correct distribution of the grease, move the clamping
piston to its end positions several times, lubricate again, and
then check the clamping force.

• We recommend checking the clamping force using a clamping
force tester before starting a new production run and between
maintenance intervals. "Only regular checks can guarantee
optimal safety."

• The clamping force should always be measured in the state of
the chuck as used for the current clamping situation. If top jaws
with clamping steps are used, measuring must be performed in
the same step as for the respective clamping task. In the event
of high operating speeds, clamping force losses must be

Basic safety notes

12

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accounted for due to the centrifugal force acting on the
chuck jaws. The operating clamping force must in this case be
determined by means of dynamic measurement.

• Move the clamping piston through to its end position several
times after 500 clamping strokes, at the latest. (This moves the
lubricant back to the surfaces of the force transmission. This
means that the clamping force is retained for longer).

Safety notes for servicing
Follow all the applicable legal norms for health and safety during

servicing. Use suitable personal protective equipment, especially
protective gloves, goggles and safety boots, paying particular
attention to the operating system and hazard assessment.

DANGER

Possible risk of fatal injury to operating personnel due to
chuck failure if the servicing instructions for the chuck are
disregarded!

The servicing instructions specified by the manufacturer must be
complied with to ensure safe operation of the chuck.
Work must be carried out by qualified specialist personnel with
the relevant safety training.

Use of special chuck jaws
When using special chuck jaws, please observe the following rules:

• The chuck jaws should be designed to be as light and as low as
possible. The clamping point must be as close as possible to the
chuck face (clamping points at a greater distance lead to great­er surface pressure in the jaw guidance and can significantly
reduce the clamping force).

• Do not use welded jaws.

• If for constructional reasons the chuck jaws in special design
are heavier than the top jaws assigned to the clamping device,
greater centrifugal forces must be accounted for when defining
the required clamping force and the recommended speed.

• Screw the jaw mounting screws into the bore holes furthest
apart.

Basic safety notes

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13

• The maximum recommended speed may only be operated in
conjunction with maximum actuating force and only with the
chuck in optimal, fully functioning condition.

• If the chuck is involved in a collision, it must be subjected to a
crack test before using it again. Replace damaged parts with
original SCHUNK spare parts.

• Replace the chuck jaw mounting screws if there are signs of
wear or damage. Only use screws with a quality of 12.9.

Substantial modifications

No substantial modifications may be made to the chuck.

If the operator carries out a substantial modification to the
chuck, the product shall no longer conform to the EC Machinery
Directive 2006/42/EC.

Personnel qualification

Assembly and disassembly, commissioning, operation and repair of
the chuck may be performed only by qualified specialists who have
been instructed with respect to safety.

All persons who are assigned to operate, maintain and repair our
chuck must have access to the operating manual, especially the

chapter “Fundamental safety instructions”. We recommend that

the operator create in-house safety operating instructions.
Persons in training may be assigned to machines and technical

equipment in which a chuck is mounted only if they are under the
constant guidance and supervision of qualified specialists.

Organizational measures

Obeying the rules

Via suitable organizational measures and instructions, the
operator must ensure that the relevant safety rules are obeyed
by the persons asked to operate, maintain and repair the chuck.

2.4.1

2.5

2.6

Basic safety notes

14

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Checking the behavior of personnel
The operator must at least occasionally check that the personnel
are behaving in a safety conscious manner and are aware of the
potential hazards.

Danger signs
The operator must ensure that the signs concerning safety and
hazards mounted on the machine where the chuck is mounted are
clearly legible and are observed.

Faults
If a fault occurs on the chuck and this fault endangers safety or if
a problem is suspected due to production characteristics, the
machine tool where the chuck is mounted must be immediately
stopped and remain shut down until the fault has been located
and remedied. Only allow specialists to remedy faults.

Spare parts
Only ever use original SCHUNK spare parts.

Environmental regulations
Comply with the applicable legal norms when disposing of waste.

Using personal protective equipment

When using this product, you must comply with the relevant
health and safety at work rules and you must use the required
personal safety equipment (minimum: category 2).

2-jaw chuck

The values for the total clamping force, recommended speed and
actuating force are embossed on the chuck body.

The base jaws are aligned in the front stroke position. The top jaws
only align after 10 mm of piston stroke.

Only parts that are flat in the clamping direction or on which
compensation is only expected in the jaw guidance direction can
be clamped.

2.7

2.8

Warranty / Torques per screw

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15

Warranty

If the product is used as intended, the warranty is valid for
12 months from the date of delivery from the production facility
under the following conditions:

• Observe the applicable documents ( 1.2, Page 5)

• Observe the environmental and operating conditions.

• Observation of the maximum clamping cycles( 6, Page 17)

• Observe the mandatory maintenance and lubrication

intervals.( 9, Page 26)

Parts touching the work piece and wearing parts are not part of
the warranty.

Torques per screw

Tightening torques for mounting screws used to clamp the
chuck on lathes or other suitable technical equipment

(screw quality 10.9)

Screw size

M6

M8

M10

M12

M14

M16

M18

M20

M22

M24

M27

M30

Admissible torque
MA (Nm)

13

28

50

88

120

160

200

290

400

500

1050

1500

Tightening torques for mounting screws used to attach top jaws
onto the chuck (screw quality 12.9)

Screw size

M6

M8

M10

M12

M14

M16

M20

M24

Torque MA (Nm)

16

30

50

70

130

150

220

450

3

4

Scope of delivery

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Scope of delivery

1

HSA power chuck in the version ordered

HSA 160

(Id-No. 88001862, 88021732, 88029313, 88035481, 88037348,
88039738, 88036995)
HSA 160 – 2-jaw chuck
(Id-No. 88026206, 88029240, 88036160, 88041389)
HSA-NZ 170 – 2-jaw chuck
(Id-No. 88027365)
HSA 180 – 2-jaw chuck
(Id-No. 88036423)
HSA 200
(Id-No. 88002843, 88002909, 88002958, 88004159, 88018669,
88020485, 88026696, 88028474, 88028566, 88039479, 88039429)
HSA 250
(Id-No. 88018463, 88018469, 88019551)
HSA 250 – 2-jaw chuck
(Id-No. 88028004, 88034564)
HSA 265
(Id-No. 88003413, 88003473)
HSA 315
(Id-No. 88037992, 88040302)
HSA 315 – 2-jaw chuck
(Id-No. 88029693)
HSA 400
(Id-No. 88026570)
HSA 630 – 2-jaw chuck
(Id-No. 88019966)

1

Intermediate flange (Item 10)

Fastening screws – Chuck on mounting and mounting on spindle.

HSA 160, HSA 160/2, 200, 250, 315, 400 and 630/2:
T-nuts with screws, or groove combinations with 2 screws
(Item 14)

4
1

HSA-NZ 170, HSA 180/2:
Screws for mounting
Set of top jaws

2 HSA 315/2:
Screws DIN EN ISO 4762 (for mounting the top jaws)

1

Operating manual

5

Technical data

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17

Technical data

For the technical data for the chucks, refer to the enclosed
drawings.

Balancing:
The HSA chuck is balanced in accordance with DIN ISO 1940.
For balancing, a balancing grade of G 6.3 is selected and the mass
and maximum recommended speed of the chuck are used as
reference values. It applies to self-centering clamping using the
bushing.

Warranty and maximum clamping cycles

Length of warranty

12 Months

Maximum clamping cycle number

300 000 Cycles

Calculation of the clamping force based on the speed:

ΣS = a · F ± 0.00001096 · (M · r + K) · n2
Total clamping force = Static clamping force ± Loss of centrifugal

force

The loss of centrifugal force must not exceed 50% of the static
clamping force.

±:

Minus (–) applies to O.D. clamping and plus (+) to I.D. clamping

ΣS:

Total clamping force in N

M:

Mass of all top jaws with T-nuts and screws in kg

r:

Distance from chuck center to center of gravity of top jaws
in mm

K:
K =
K =
K =
K =
K =
K =
K =
K =
K =
K =
K =
K =

Constant for the base jaw

3077.0 on HSA 630/2

460.2 on HSA 400

630.0 on HSA 315

646.0 on HSA 315/2

401.2 on HSA 265

293.8 on HSA 250

196.0 on HSA 250/2

84.2 on HSA 200
83 on HSA 180/2

46.6 on HSA-NZ 170/2

69.5 on HSA 160

46.3 on HSA 160/2

6

6.1

Technical data

18

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F:

Actuating force in N

n:

Speed in rpm

a:

Static chuck constant:

1.94 on HSA-NZ 170

2.00 on HSA 160, 180/2, HSA 200

2.40 on HSA 265, HSA 250, HSA 250/2, HSA 400

2.30 on HSA 315

2.50 on HSA 315/2

Maximum distance from front face of chuck to center of
workpiece (reach):

HSA 160:
HSA 160/2:
HSA-NZ 170/2:
HSA 180/2:
HSA 200:
HSA 250:
HSA 250/2:
HSA 265:
HSA 315:
HSA 315/2:
HSA 400:
HSA 630/2:

30 mm
30 mm
35 mm
35 mm
46 mm
46 mm
46 mm
46 mm
55 mm
55 mm
75 mm
100 mm

(Greater jaw distances after consultation with clamping
technology technical sales team)

Grades of Accuracy

Tolerances for run-out accuracy and axial run-out accuracy
correspond to the Technical Supply Terms for lathe chucks as
per DIN ISO 3089.

Permissible imbalance

The permissible imbalance for lathe chucks is quality class
G 6.3 as per DIN ISO 1940-1.

6.2

6.3

Assembly

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19

Assembly

The specified item numbers for the corresponding individual
components relate to the enclosed drawings or to the Drawings

chapter ( 12, Page 30).

Pre-assembly measures

Carefully lift the product (e.g. using suitable lifting gear) from the
packaging.

CAUTION

Danger of injury due to sharp edges and rough or slippery
surfaces

Use personal protective gear, especially safety gloves.

Check the delivery for completeness and for transport damage.

Assembly of the HSA chuck

• Check the machine spindle nose and ready-machined inter­mediate flange for radial and axial run-out. The permissible
limit is 0.005 mm in accordance with DIN 6386 and ISO 3089.

• The contact surface must be chamfered and completely clean
at the bore holes.

• Unscrew the cylindrical screws (Item 18) and remove the guide
bushing (Item 4, 11, or 13).

• Actuate the clamping cylinder to slide the draw tube to the
front position (see illustration: "Mounting the chuck")

HSA 160, 160/2, NZ 170/2, 180/2, 200, 250, 250/2, 265, 315,
315/2 and 400:

• Screw the intermediate flange (Item 10) onto the spindle using
the screws (Item 19).

• Move the guide part (Item 5) to the front position.

• Raise the chuck in front of the spindle lug using an assembly
belt or eye bolt until it is flush with the center of the spindle.

7

7.1

7.2

Assembly

20

01.00| |en

• Screw the power chuck onto the draw tube as far as it will go.
(Make sure that the draw tube thread is flush.)
The HSA 160,160/2, HSA-NZ 170/2,180/2, HSA 250, HSA 250/2
and HSA 400 is screwed onto the draw bar using the screw
(Item 15). (The screw must also be flush with the draw bar
thread.

• The chuck is screwed onto the intermediate flange (spindle)
using the screws (Item 17).
The run-out can be aligned as follows: Slightly loosen the
screws (Item 17). Fit a dial gauge on the cylindrical surface of
the chuck body (Item 1). Align the run-out using the set-screws
(Item 23). Tighten the screws (Item 17) alternately.

HSA 630/2:

• Lift the chuck with the flange screwed on (Item 10) in front of
the spindle lug using an eye bolt until it is flush with the center
of the spindle. The bore holes for the screws (Item 17) should
be flush with the threaded holes in the spindle.

• Screw onto the draw bar using the screw (Item 15). (The screw
(Item 17) must also be flush with the draw rod thread.)

• Slightly tighten the screws (Item 17) alternately. Also slightly
tighten the screws (Item 19).

• The run-out can be aligned as follows: Place a dial gauge on
the cylindrical surface of the chuck body (Item 1). Adjust the
set-screws (Item 23) to align the run-out. Securely tighten
the screws (Item 17 and 19) alternately.

Tighten the fastening screws, quality class 10.9, using a torque

wrench. (See "Screw tightening torques" chapter ( 4, Page 15)).

On no account tighten the Allen key with an extension pipe or
with hammer blows.

All HSA chuck types:

• Fit the guide bushing for the compensating clamping (Item 4)
or self-centering clamping (Item 13) using the screws (Item 18).

Assembly

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21

Mounting the chuck

Cylinder piston in foremost position
R1 = Push the chuck piston to its foremost position and measure
with a depth gauge
R2 = R1 – 0.5 mm (max. – 1 mm)

Chuck function

22

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Chuck function

The item numbers specified for the corresponding individual

components relate to chapter drawings.( 12, Page 30)

Functional principle

The HSA compensation chuck in wedge-hook design is actuated
by a rotating solid or through-hole cylinder. The axial tensile or
pressure forces are converted to the radial jaw clamping force by
the wedge hook angle in the piston and base jaws.
Special feature: The guide part (Item 5) is moved in a fitting in the
spindle.

Compensation clamping with guide bushing (Item 4):
The guide part (Item 5) transmits the actuating force of the
cylinder to a piston (Item 3) with floating bearing. Therefore, the
base jaws can be adjusted for a workpiece mounted off-center.
The top jaws adjust to an eccentrically positioned workpiece
within the specified limits (see drawing).
The base jaws are therefore capable of compensating clamping
(with even pressure from all sides of the jaws) of a workpiece that
is eccentric between the center point (Item 12) and the clamping
face (external circular area). A cylindrical part can be clamped in a
defined eccentric position without a center point.

The base jaws are aligned in the front stroke position. The top
jaws only align after around 1/3 of a piston stroke to the left.

HSA 2-jaw chucks: Only parts that are flat in the clamping
direction or on which compensation is only expected in the jaw
guidance direction can be clamped.

Self-centering clamping with guide bushing (Item 11, 13):

The piston (Item 3) is moved in a fitting in the guide bushing
(Item 11, 13). The compensating function of the piston (Item 3)
is blocked. Therefore, the base jaws (Item 2) can only clamp in a
central position.

8

8.1

Chuck function

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23

Replacement or renewal of jaws

Chuck jaws for maximum repeat clamping accuracy must
be turned or ground in the chuck under clamping pressure.
Self-centering clamping (see drawing) must be selected in
this case.

• When turning or grinding, ensure that the turning ring or
turning pin is clamped by the top jaws and not by the base
jaws.

• Tighten the jaw mounting screws to the specified torque.

( 4, Page 15)

Tighten the jaw mounting screws, quality class 12.9, using a
torque wrench. On no account tighten the Allen key with an
extension pipe or with hammer blows. See "Screw tightening

torques" chapter ( 4, Page 15).

Disassembly and assembly of the Chuck

The chuck can only be disassembled once it has been removed.

(See "HSA chuck assembly" chapter ( 7.2, Page 19)).

WARNING

Risk of injury due to the power chuck falling during
transportation, installation or removal

During transportation and when installing or removing the power
chuck, ensure it does not fall.

HSA 160, HSA 160/2, HSA 180/2, HSA 200, HSA 250, HSA 250/2,
HSA 265, HSA 315 and HSA 315/2

• Unscrew the cylindrical screw (Item 18) and remove the guide
bushing (Item 4, 11, or 13).

• Pull the guide part (Item 5) with piston (Item 3) out of the
chuck body (Item 1). Pull out the bolt (Item 7). The guide part
(Item 5) and the piston (Item 3) can be detached from one
another by twisting the parts by 60° (bayonet connection).

• Slide the base jaws (Item 2) inwards out of the guide and
remove from the chuck body.

• If fitted, remove the set-screw (Item 22) and then the screw
(Item 15) and nut (Item 6).

8.2

8.3

Chuck function

24

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HSA-NZ 170/2

• Remove all screws (Item 26) and then remove the center
(Item 16). Unscrew the screws (Item 18) and remove the cover
(Item 13). Then unscrew further screws (Item 18) and remove
the guide bushing (Item 4).

• Pull the guide part (Item 5) with piston (Item 3) out of the
chuck body (Item 1). Pull out the bolt (Item 7). The guide part
(Item 5) and the piston (Item 3) can be detached from one
another by twisting the parts by 60° (bayonet connection).

• Slide the base jaws (Item 2) out of the guide and remove from
the chuck body.

• Remove the set-screw (Item 22). Remove the screw (Item 15)
and nut (Item 6).

HSA 400

• Unscrew the cylindrical screw (Item 18) and remove the guide
bushing (Item 4 or 11).

• Unscrew the screws (Item 29) from the chuck body.

• Remove the guide strips (Item 8 and 9). The base jaws (Item 2)
can now be removed.

• Pull the guide part (Item 5) with piston (Item 3) out of the
chuck body (Item 1). Pull out the bolt (Item 7). The guide part
(Item 5) and the piston (Item 3) can be detached from one
another by twisting the parts by 60° (bayonet connection).

• Remove the set-screw (Item 22). Remove the screw (Item 15).

HSA 630/2

• Unscrew the cylindrical screw (Item 18) and remove the guide
bushing (Item 4 or 11).

• Remove the cylindrical screw (Item 19) and set-screws
(Item 23). Remove the mounting (Item 10).

• Pull the guide part (Item 5) with piston (Item 3) out of the
chuck body (Item 1). Pull out the bolt (Item 7). The guide part
(Item 5) and the piston (Item 3) can be detached from one
another by twisting the parts by 60° (bayonet connection).

• Unscrew the screws (Item 8) out of the chuck body and slide
the base jaws outwards.

Chuck function

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25

• The center point (Item 12) can be released from the guide
bushing (Item 4) by exerting a slight pressure.

• Remove the set-screw (Item 22). Remove the screw (Item 15)
and nut (Item 6).

When assembling the base jaws, make sure that the number
of notches on the base jaw matches the numbering on the jaw
guide.

Only use genuine SCHUNK spare parts when replacing damaged
parts. The chuck must be completely assembled, including all the
small components, before start-up. Each small component may
have a safety function in the chuck.
Tighten the screws with a torque wrench. See "Screw tightening
torques" chapter. The screws have a quality class of 10.9 and 8.8.

( 4, Page 15)

Degrease and clean all parts and check them for damage.
Before assembly, grease well with LINO MAX special grease.
The chuck is assembled in the same way but in reverse order.

Maintenance

26

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Maintenance

Lubrication

To maintain the safe function and high quality of the chuck, it has
to be regularly lubricated at the lubrication nipples. Use SCHUNK
LINO MAX special grease for this purpose.

• For optimum grease distribution, the clamping piston must
travel the entire clamping stroke several times after lubrication.

Operating conditions:
Depending on the operating conditions, the function and clamping
force must be checked after a certain period of operation

( 9.2, Page 26). The most accurate way to measure the clamping

force is with a clamping force tester.
Technical condition:

When the smallest possible actuating pressure is applied (clamping
cylinder), the base jaws must move evenly. This method only
provides a limited indication and does not replace measurement
of the clamping force.

• If the clamping force has dropped too far or if the base jaws
and clamping piston no longer move properly, the chuck has
to be disassembled, cleaned, and relubricated.

Only use genuine SCHUNK spare parts when replacing damaged
parts.

Maintenance intervals

Lubrication of the grease areas:

Lubrication interval

Strain

every 25 hours

normal / coolant utilization

every 8 hours

high / coolant utilization

after 1200 hours or
as needed

Total cleaning with disassembly of the
chuck, depending on type and degree of
contamination

Changing the top jaws

When changing the top jaws the serration must be cleaned and
greased with SCHUNK special grease LINO MAX.

9

9.1

Position of lubrication nipple

9.2

9.3

Disposal

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27

Disposal

After decommissioning, place the chuck in a position that enables
any liquids in the chuck to drain out.

• Collect the escaping liquids and dispose of them properly in line
with the statutory provisions.

• Remove any identifiable plastic or aluminum parts installed in
or on the chuck and dispose of them properly in line with the
statutory provisions.

• Dispose of the chuck's metal parts as scrap metal.

Alternatively, you can return the chuck to SCHUNK for proper
disposal.

10

Parts lists

28

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Parts lists

When ordering spare parts, it is imperative to specify the type,
size and above all the manufacturing no of the chuck.

Seals, sealing elements, screw connections, springs, bearings,
screws and wiper bars plus parts coming into contact with the
workpiece are not covered by the warranty.

HSA 160, HSA 160/2, HSA 180/2, HSA 200, HSA 250, HSA 265, HSA
315, HSA 315/2, HSA 400 and HSA 630/2

Item

Designation

1

Chuck body

2

Base jaws (1 set)

3

Piston

4

Compensating guide bushing

5

Guide part

6

Nut

7

Bolt

8

Screw

8/9

Guide strip (HSA 400)

10

Chuck flange (intermediate flange)

11

Guide bushing, self-centering

12

Center point

13

Guide bushing, self-centering

14

T-nuts or screws

15

Mounting screw

17

Screw

16

Screw

18

Screw

19

Screw

20

Flanged nut (HSA 315/2)

22

Set-screw

23

Set-screw

25

Pressure piece

28

Lubrication nipple

31

Filler piece (HSA 315)

32

Screw (HSA 315)

11

Parts lists

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29

HSA-NZ 170

Item

Designation

1

Chuck body

2

Base jaws (1 set)

3

Piston

4

Compensating guide bushing

5

Guide part

6

Nut

7

Bolt

10

Chuck flange

13

Cover

14

Screws

15

Screw

16

Center point

17

Screws

18

Screws

19

Screws

22

Set-screw

23

Set-screw

26

Screws

28

Lubrication nipple

29

Set-screw

90

Pin

Drawings

30

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Drawings

HSA 315 - without center point

12

Drawings

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31

HSA 400 - Compensation chuck with center point

Drawings

32

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HSA-NZ 170 - Compensation chuck