SCHUNK PRG Series User instructions

Translation of the original manual
Assembly and Operating Manual
PRG
Pneumatic Radial gripper

Imprint
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Imprint
Copyright:
This manual is protected by copyright. The author is SCHUNK GmbH & Co. KG. All rights
reserved. Any reproduction, processing, distribution (making available to third parties),
translation or other usage - even excerpts - of the manual is especially prohibited and
requires our written approval.
Technical changes:
We reserve the right to make alterations for the purpose of technical improvement.
Document number: 389325
Version: 08.00|15/05/2020|en
© SCHUNK GmbH & Co. KG
All rights reserved.
Dear Customer,
thank you for trusting our products and our family-owned company, the leading
technology supplier of robots and production machines.
Our team is always available to answer any questions on this product and other solutions.
Ask us questions and challenge us. We will find a solution!
Best regards,
Your SCHUNK team
SCHUNK GmbH & Co. KG
Clamping and gripping technology
Bahnhofstr. 106 - 134
D-74348 Lauffen/Neckar
Tel. [phone]
Fax [phone]
[email protected]
schunk.com

Table of Contents
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Table of Contents
1 General.................................................................................................................... 5
1.1 About this manual ................................................................................................ 5
1.1.1 Presentation of Warning Labels ...............................................................5
1.1.2 Definition of Terms...................................................................................6
1.1.3 Applicable documents ..............................................................................6
1.1.4 Sizes ..........................................................................................................6
1.1.5 Variants.....................................................................................................6
1.2 Warranty .............................................................................................................. 6
1.3 Scope of delivery .................................................................................................. 7
1.3.1 Accessories kit ..........................................................................................7
1.4 Accessories ........................................................................................................... 8
1.4.1 Seal kit ......................................................................................................8
1.4.2 Mounting kit for proximity switch ............................................................8
2 Basic safety notes ................................................................................................... 9
2.1 Intended use......................................................................................................... 9
2.2 Not intended use.................................................................................................. 9
2.3 Constructional changes ........................................................................................ 9
2.4 Spare parts ........................................................................................................... 9
2.5 Gripper fingers ................................................................................................... 10
2.6 Ambient conditions and operating conditions ...................................................10
2.7 Personnel qualification....................................................................................... 10
2.8 Personal protective equipment.......................................................................... 11
2.9 Notes on safe operation .....................................................................................11
2.10 Transport ............................................................................................................ 11
2.11 Malfunctions....................................................................................................... 12
2.12 Disposal .............................................................................................................. 12
2.13 Fundamental dangers......................................................................................... 12
2.13.1 Protection during handling and assembly ..............................................12
2.13.2 Protection during commissioning and operation ...................................13
2.13.3 Protection against dangerous movements.............................................13
2.13.4 Protection against electric shock............................................................14
2.14 Notes on particular risks..................................................................................... 14
3 Technical data.........................................................................................................16
4 Assembly ................................................................................................................17
4.1 Installing and connecting.................................................................................... 17
4.2 Connections........................................................................................................ 19
4.2.1 Mechanical connection...........................................................................19
4.2.2 Gripper finger .........................................................................................21

Table of Contents
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4.2.3 Air connection ........................................................................................22
4.3 Mounting the sensor .......................................................................................... 24
4.3.1 Overview of sensors ...............................................................................24
4.3.2 Setting dimensions for magnetic switches .............................................25
4.3.3 Inductive proximity switch IN 40 ............................................................26
4.3.4 Inductive proximity switch IN 40 ............................................................28
4.3.5 Magnetic switch MMS 22 / RMS 22 .......................................................30
4.3.6 Mounting MMS 22-PI1 programmable magnetic switch........................32
4.3.7 Mounting programmable MMS 22-PI2 magnetic switch........................34
4.3.8 Programmable magnetic switch (MMS-P)..............................................35
5 Troubleshooting .....................................................................................................36
5.1 Product is not moving......................................................................................... 36
5.2 Product does not travel the entire stroke .......................................................... 36
5.3 Product opens or closes abruptly ....................................................................... 36
5.4 Product opens with heavy impacts in the end position .....................................36
5.5 Gripping force is dropping.................................................................................. 37
5.6 Product does not achieve the opening and closing times..................................37
6 Maintenance ..........................................................................................................38
6.1 Notes .................................................................................................................. 38
6.2 Maintenance interval ......................................................................................... 38
6.3 Lubricants/Lubrication points............................................................................. 38
6.4 Disassembly of PRG 26 - 64 ................................................................................ 39
6.4.1 Version without gripping force maintenance.........................................39
6.4.2 Variant with gripping force maintenance “O.D. gripping”......................39
6.5 Disassembly of PRG 80-125 ................................................................................ 40
6.5.1 Version without gripping force maintenance.........................................40
6.5.2 Variant with gripping force maintenance “O.D. gripping”......................41
6.6 Servicing and assembling the product................................................................ 42
6.6.1 Screw tightening torques........................................................................42
6.7 Drawings............................................................................................................. 43
6.7.1 Assembly drawing PRG 26-64.................................................................43
6.7.2 Assembly drawing PRG 80-125...............................................................44
7 Translation of original declaration of incorporation ................................................45
7.1 Annex to Declaration of Incorporation............................................................... 46

General
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1 General
1.1 About this manual
This manual contains important information for a safe and
appropriate use of the product.
This manual is an integral part of the product and must be kept
accessible for the personnel at all times.
Before starting work, the personnel must have read and
understood this operating manual. Prerequisite for safe working is
the observance of all safety instructions in this manual.
Illustrations in this manual are provided for basic understanding
and may differ from the actual product design.
In addition to these instructions, the documents listed under
Applicable documents [}6] are applicable.
1.1.1 Presentation of Warning Labels
To make risks clear, the following signal words and symbols are
used for safety notes.
DANGER
Danger for persons!
Non-observance will inevitably cause irreversible injury or death.
WARNING
Dangers for persons!
Non-observance can lead to irreversible injury and even death.
CAUTION
Dangers for persons!
Non-observance can cause minor injuries.
CAUTION
Material damage!
Information about avoiding material damage.

General
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1.1.2 Definition of Terms
The term "product" replaces the product name on the title page in
this manual.
1.1.3 Applicable documents
• General terms of business *
• Catalog data sheet of the purchased product *
• Assembly and operating manuals of the accessories *
The documents marked with an asterisk (*) can be downloaded on
our homepage schunk.com
1.1.4 Sizes
This operating manual applies to the following sizes:
• PRG 26
• PRG 34
• PRG 42
• PRG 52
• PRG 64
• PRG 80
• PRG 100
• PRG 125
1.1.5 Variants
This operating manual applies to the following variations:
• PRG without gripping force maintenance
• PRG with gripping force maintenance "O.D. gripping" (AS)
• PRG high-temperature (V/HT)
1.2 Warranty
If the product is used as intended, the warranty is valid for 24
months from the ex-works delivery date under the following
conditions:
• Observe the specified maintenance and lubrication intervals
• Observe the ambient conditions and operating conditions
Parts touching the workpiece and wear parts are not included in
the warranty.

General
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1.3 Scope of delivery
The scope of delivery includes
• Pneumatic Radial gripper PRG in the version ordered
• Assembly and Operating Manual
• Accessory pack
1.3.1 Accessories kit
Content of the accessory pack:
• Centering sleeves (6x)
• from size 80: Centering sleeves (8x)
• O-rings (4x)
• Locking screws (2x)
ID.-No. of the accessory pack
Accessory pack for ID number
PRG 26 5517554
PRG 26 High-temperature version (HT) 5517555
PRG 34 5517556
PRG 34 High-temperature version (HT) 5517557
PRG 42 5517558
PRG 42 High-temperature version (HT) 5517559
PRG 52 5517560
PRG 52 High-temperature version (HT) 5517561
PRG 64 5517562
PRG 64 High-temperature version (HT) 5517563
PRG 80 5517564
PRG 80 High-temperature version (HT) 5517565
PRG 100 5517566
PRG 100 High-temperature version (HT) 5517567
PRG 125 5517568
PRG 125 High-temperature version (HT) 5517569

General
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1.4 Accessories
A wide range of accessories are available for this product
For information regarding which accessory articles can be used
with the corresponding product variants, see catalog data sheet.
1.4.1 Seal kit
ID.-No. of the seal kit
Seal kit for ID number
PRG 26 5521254
PRG 26 High-temperature version (HT) 5521255
PRG 34 5521256
PRG 34 High-temperature version (HT) 5521257
PRG 42 5521258
PRG 42 High-temperature version (HT) 5521259
PRG 52 5521260
PRG 52 High-temperature version (HT) 5521261
PRG 64 5521262
PRG 64 High-temperature version (HT) 5521263
PRG 80 5521264
PRG 80 High-temperature version (HT) 5521265
PRG 100 5521266
PRG 100 High-temperature version (HT) 5521267
PRG 125 5521268
PRG 125 High-temperature version (HT) 5521269
Contents of the sealing kit, Drawings [}43].
1.4.2 Mounting kit for proximity switch
ID.-No. of the mounting kit
Mounting kit for Proximity switch IN 40 Proximity switch IN 80
PRG 26 0303621 0304132
PRG 34 0303622 0304133
PRG 42 030623 0304134
PRG 52 0303624 0304135
PRG 64 0303625 0304136
PRG 80 - 0303626
PRG 100 - 0303627
PRG 125 - 0303628
Contents of the mounting kit Drawings [}43].

Basic safety notes
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2 Basic safety notes
2.1 Intended use
The product is designed exclusively for gripping and temporarily
holding workpieces or objects.
• The product may only be used within the scope of its technical
data, Technical data [}16].
• When implementing and operating components in safety-
related parts of the control systems, the basic safety principles
in accordance with DIN EN ISO 13849-2 apply. The proven safety
principles in accordance with DIN EN ISO 13849-2 also apply to
categories 1, 2, 3 and 4.
• The product is intended for installation in a machine/system.
The applicable guidelines must be observed and complied with.
• The product is intended for industrial and industry-oriented use.
• Appropriate use of the product includes compliance with all
instructions in this manual.
2.2 Not intended use
It is not intended use if the product is used, for example, as a
pressing tool, stamping tool, lifting gear, guide for tools, cutting
tool, clamping device or a drilling tool.
• Any utilization that exceeds or differs from the appropriate use
is regarded as misuse.
2.3 Constructional changes
Implementation of structural changes
By conversions, changes, and reworking, e.g. additional threads,
holes, or safety devices can impair the functioning or safety of the
product or damage it.
• Structural changes should only be made with the written
approval of SCHUNK.
2.4 Spare parts
Use of unauthorized spare parts
Using unauthorized spare parts can endanger personnel and
damage the product or cause it to malfunction.
• Use only original spare parts or spares authorized by SCHUNK.

Basic safety notes
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2.5 Gripper fingers
Requirements for the gripper fingers
Stored energy within the product creates the risk of serious
injuries and significant property damage.
• Arrange the gripper fingers in a way that the product reaches
either the position "open" or "closed" in a de-energized state.
• Only exchange the gripper fingers when no residual energy
remains in the product.
• Make sure that the product and the top jaws are a sufficient
size for the application.
2.6 Ambient conditions and operating conditions
Required ambient conditions and operating conditions
Incorrect ambient and operating conditions can make the product
unsafe, leading to the risk of serious injuries, considerable material
damage and/or a significant reduction to the product's life span.
• Make sure that the product is used only in the context of its
defined application parameters, Technical data [}16].
2.7 Personnel qualification
Inadequate qualifications of the personnel
If the personnel working with the product is not sufficiently
qualified, the result may be serious injuries and significant
property damage.
• All work may only be performed by qualified personnel.
• Before working with the product, the personnel must have read
and understood the complete assembly and operating manual.
• Observe the national safety regulations and rules and general
safety instructions.
The following personal qualifications are necessary for the various
activities related to the product:
Trained electrician Due to their technical training, knowledge and experience, trained
electricians are able to work on electrical systems, recognize and
avoid possible dangers and know the relevant standards and
regulations.
Qualified personnel Due to its technical training, knowledge and experience, qualified
personnel is able to perform the delegated tasks, recognize and
avoid possible dangers and knows the relevant standards and
regulations.
Instructed person Instructed persons were instructed by the operator about the
delegated tasks and possible dangers due to improper behaviour.
Service personnel of
the manufacturer
Due to its technical training, knowledge and experience, service
personnel of the manufacturer is able to perform the delegated
tasks and to recognize and avoid possible dangers.

Basic safety notes
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2.8 Personal protective equipment
Use of personal protective equipment
Personal protective equipment serves to protect staff against
danger which may interfere with their health or safety at work.
• When working on and with the product, observe the
occupational health and safety regulations and wear the
required personal protective equipment.
• Observe the valid safety and accident prevention regulations.
• Wear protective gloves to guard against sharp edges and
corners or rough surfaces.
• Wear heat-resistant protective gloves when handling hot
surfaces.
• Wear protective gloves and safety goggles when handling
hazardous substances.
• Wear close-fitting protective clothing and also wear long hair in
a hairnet when dealing with moving components.
2.9 Notes on safe operation
Incorrect handling of the personnel
Incorrect handling and assembly may impair the product's safety
and cause serious injuries and considerable material damage.
• Avoid any manner of working that may interfere with the
function and operational safety of the product.
• Use the product as intended.
• Observe the safety notes and assembly instructions.
• Do not expose the product to any corrosive media. This does
not apply to products that are designed for special
environments.
• Eliminate any malfunction immediately.
• Observe the care and maintenance instructions.
• Observe the current safety, accident prevention and
environmental protection regulations regarding the product's
application field.
2.10 Transport
Handling during transport
Incorrect handling during transport may impair the product's safety
and cause serious injuries and considerable material damage.
• When handling heavy weights, use lifting equipment to lift the
product and transport it by appropriate means.
• Secure the product against falling during transportation and
handling.
• Stand clear of suspended loads.

Basic safety notes
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2.11 Malfunctions
Behavior in case of malfunctions
• Immediately remove the product from operation and report the
malfunction to the responsible departments/persons.
• Order appropriately trained personnel to rectify the
malfunction.
• Do not recommission the product until the malfunction has
been rectified.
• Test the product after a malfunction to establish whether it still
functions properly and no increased risks have arisen.
2.12 Disposal
Handling of disposal
The incorrect handling of disposal may impair the product's safety
and cause serious injuries as well as considerable material and
environmental harm.
• Follow local regulations on dispatching product components for
recycling or proper disposal.
2.13 Fundamental dangers
General
• Observe safety distances.
• Never deactivate safety devices.
• Before commissioning the product, take appropriate protective
measures to secure the danger zone.
• Disconnect power sources before installation, modification,
maintenance, or calibration. Ensure that no residual energy
remains in the system.
• If the energy supply is connected, do not move any parts by
hand.
• Do not reach into the open mechanism or movement area of
the product during operation.
2.13.1 Protection during handling and assembly
Incorrect handling and assembly
Incorrect handling and assembly may impair the product's safety
and cause serious injuries and considerable material damage.
• Have all work carried out by appropriately qualified personnel.
• For all work, secure the product against accidental operation.
• Observe the relevant accident prevention rules.
• Use suitable assembly and transport equipment and take
precautions to prevent jamming and crushing.

Basic safety notes
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Incorrect lifting of loads
Falling loads may cause serious injuries and even death.
• Stand clear of suspended loads and do not step into their
swiveling range.
• Never move loads without supervision.
• Do not leave suspended loads unattended.
2.13.2 Protection during commissioning and operation
Falling or violently ejected components
Falling and violently ejected components can cause serious injuries
and even death.
• Take appropriate protective measures to secure the danger
zone.
• Never step into the danger zone during operation.
2.13.3 Protection against dangerous movements
Unexpected movements
Residual energy in the system may cause serious injuries while
working with the product.
• Switch off the energy supply, ensure that no residual energy
remains and secure against inadvertent reactivation.
• Never rely solely on the response of the monitoring function to
avert danger. Until the installed monitors become effective, it
must be assumed that the drive movement is faulty, with its
action being dependent on the control unit and the current
operating condition of the drive. Perform maintenance work,
modifications, and attachments outside the danger zone
defined by the movement range.
• To avoid accidents and/or material damage, human access to
the movement range of the machine must be restricted. Limit/
prevent accidental access for people in this area due through
technical safety measures. The protective cover and protective
fence must be rigid enough to withstand the maximum possible
movement energy. EMERGENCY STOP switches must be easily
and quickly accessible. Before starting up the machine or
automated system, check that the EMERGENCY STOP system is
working. Prevent operation of the machine if this protective
equipment does not function correctly.

Basic safety notes
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2.13.4 Protection against electric shock
Possible electrostatic energy
Components or assembly groups may become electrostatically
charged. When the electrostatic charge is touched, the discharge
may trigger a shock reaction leading to injuries.
• The operator must ensure that all components and assembly
groups are included in the local potential equalisation in
accordance with the applicable regulations.
• While paying attention to the actual conditions of the working
environment, the potential equalisation must be implemented
by a specialist electrician according to the applicable
regulations.
• The effectiveness of the potential equalisation must be verified
by executing regular safety measurements.
2.14 Notes on particular risks
DANGER
Risk of fatal injury from suspended loads!
Falling loads can cause serious injuries and even death.
•Stand clear of suspended loads and do not step within their
swiveling range.
•Never move loads without supervision.
•Do not leave suspended loads unattended.
•Wear suitable protective equipment.
WARNING
Risk of injury from objects falling and being ejected!
Falling and ejected objects during operation can lead to serious
injury or death.
•Take appropriate protective measures to secure the danger
zone.
WARNING
Risk of injury due to unexpected movements!
If the power supply is switched on or residual energy remains in
the system, components can move unexpectedly and cause
serious injuries.
•Before starting any work on the product: Switch off the power
supply and secure against restarting.
•Make sure, that no residual energy remains in the system.

Basic safety notes
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WARNING
Risk of injury from crushing and impacts!
Serious injury could occur during the base jaw procedure and
when breaking or loosening the gripper fingers.
•Wear suitable protective equipment.
•Do not reach into the open mechanism or the movement area
of the product.
WARNING
Risk of injury from sharp edges and corners!
Sharp edges and corners can cause cuts.
•Use suitable protective equipment.
WARNING
Risk of injury due to spring forces!
Parts are under spring tension on products which clamp using
spring force or which have gripping force maintenance. While
disassembling components can move unexpectedly and cause
serious injuries.
•Disassemble the product cautiously.
•Make sure that no residual energy remains in the system.
WARNING
Risk of injury from objects falling during energy supply failure
Products with a mechanical gripping force maintenance can,
during energy supply failure, still move independently in the
direction specified by the mechanical gripping force
maintenance.
•Secure the end positions of the product with SCHUNK SDV-P
pressure maintenance valves.

Technical data
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3 Technical data
Designation PRG
Pressure medium Compressed air, compressed
air quality according to ISO
8573-1: 7:4:4
Nominal operating pressure [bar] 6
Minimum pressure [bar]
without maintenance of gripping
force
with maintenance of gripping force
2.0
4.0
Max. pressure [bar]
without gripping force maintenance
with gripping force maintenance
8
6.5
More technical data is included in the catalog data sheet.
Whichever is the latest version.
Ambient conditions and operating conditions
Designation PRG
Ambient temperature [°C]
min.
max.
-10
+90 / HT: +130
Protection class IP * 20
Noise emission [dB(A)] ≤ 70
* For use in dirty ambient conditions (e.g. sprayed water, vapors,
abrasion or processing dust) SCHUNK offers corresponding
product options as standard. SCHUNK also offers customized
solutions for special applications in dirty ambient conditions.

Assembly
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4 Assembly
4.1 Installing and connecting
WARNING
Risk of injury due to unexpected movements!
If the power supply is switched on or residual energy remains in
the system, components can move unexpectedly and cause
serious injuries.
•Before starting any work on the product: Switch off the power
supply and secure against restarting.
•Make sure, that no residual energy remains in the system.
CAUTION
Damage to the gripper is possible!
If the maximum permissible finger weight or the permissible
mass moment of inertia of the fingers is exceeded, the gripper
can be damaged.
•A jaw movement always has to be without jerks and bounce.
•You must therefore implement sufficient reduction and/or
damping.
•Observe the diagrams and information in the catalog data
sheet.
NOTE
• Observe the requirements for the compressed air supply,
Technical data [}16].
• In case of compressed air loss (cutting off the energy line), the
components lose their dynamic effects and do not remain in a
secure position. However, the use of a SDV-P pressure
maintenance valve is recommended in this case in order to
maintain the dynamic effect for some time. Product variants
are also offered with mechanical gripping force via springs,
which also ensure a minimum clamping force in the event of a
pressure drop.

Assembly
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ØCheck the evenness of the mounting surface,
Mechanical connection [}19].
ØOnly open the required air connections (main connection or
direct connection), Air connection [}22].
ØConnect the product via the hose-free direct connection.
✓Use O-rings from the accessory pack.
✓Seal main air connections which are not required with locking
screws.
ØOR: Connect compressed air lines to the main air
connections"A" and"B".
✓Screw in air connections (plug connections).
OR: Screw on throttle valve in order to be able to perform
sufficient throttling and/or damping.
ØScrew the product to the machine/system,
Mechanical connection [}19].
✓If necessary, use appropriate connection elements (adapter
plates).
✓Use centering sleeves from the enclosed accessory pack.
ØSecure the gripper fingers to the base jaws,
Mechanical connection [}19].
✓Use centering sleeves from the enclosed accessory pack.
ØConnect the sensor, see assembly and operating manual of the
sensor.
ØMount the sensor, Mounting the sensor [}24].

Assembly
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4.2 Connections
4.2.1 Mechanical connection
Evenness of the
mounting surface
The values apply to the whole mounting surface to which the
product is mounted.
Requirements for evenness of the mounting surface (Dimensions in mm)
Edge length Permissible unevenness
< 100 < 0.02
> 100 < 0.05
Connections at the
base jaws
Connections at the base jaws
Item Mounting
PRG
26 34 42 52 64 80 100 125
1 * Centering sleeve Ø5 /
4.35
Ø6 /
5.35
Ø8 /
5.35
Ø10 /
6.65
Ø12 /
6.65
Ø16 /
8.6
Ø16 /
8.6
Ø22 /
13.6
2 Thread in base jaws M3 M4 M5 M6 M8 M10 M12 M16
Max. depth of
engagement from locating
surface [mm]
6 7 8 10 13 16 20 25

Assembly
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Connections at the
housing
The product can be mounted from three sides.
Connections at the housing
Item Mounting
PRG
26 34 42 52 64 80 100 125
Side A
1 Mounting screw M3 M3 M4 M5 M5 M6 M8 M8
Max. depth of engagement
from locating surface [mm]
7 7 12 12 15 16 20 22
2 * Centering sleeve Ø5 /
4.35
Ø5 /
4.35
Ø6 /
5.35
Ø8 /
5.35
Ø8 /
5.35
Ø10 /
6.65
Ø12 /
6.65
Ø12 /
6.65
Side B
3 Mounting screw M2.5 M2.5 M3 M4 M4 M6 M6 M10
4 * Centering sleeve Ø5 /
4.35
Ø5 /
4.35
Ø6 /
5.35
Ø8 /
5.35
Ø8 /
5.35
Ø12 /
6.65
Ø12 /
6.65
Ø16 /
8.6
Side C
5 Mounting screw M3 M3 M4 M5 M5 M8 M8 M12
Max. depth of engagement
from locating surface [mm]
10 10 12 18 18 20 22 24
4 * Centering sleeve Ø5 /
4.35
Ø5 /
4.35
Ø6 /
5.35
Ø8 /
5.35
Ø8 /
5.35
Ø12 /
6.65
Ø12 /
6.65
Ø16 /
8.6
* Contained in accessory pack.