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Instron 2712 Series Operator's Manual

Pneumatic side action grips
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Series 2712 and 2732 Pneumatic Side Action Grips
Operator's Guide
M10-14179-EN Revision C
The difference is measurable
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Summary of Contents for Instron 2712 Series

  • Page 1 Series 2712 and 2732 Pneumatic Side Action Grips Operator’s Guide M10-14179-EN Revision C The difference is measurable ®...
  • Page 2 Instron is a registered trademark of Illinois Tool Works Inc. (ITW). Other names, logos, icons and marks identifying Instron products and services referenced herein are trademarks of ITW and may not be used without the prior written permission of ITW.
  • Page 3 Instron products, to the best of its knowledge, comply with various national and international safety standards, in as much as they apply to materials and structural testing.
  • Page 4 Preliminary Pages M10-14179-EN Warnings Hazard - Press the Emergency Stop button whenever you consider that an unsafe condition exists. The Emergency Stop button removes hydraulic power or electrical drive from the testing system and brings the hazardous elements of the system to a stop as quickly as possible.
  • Page 5 Preliminary Pages Warnings High/Low Temperature Hazard - Wear protective clothing when handling equipment at extremes of temperature. Materials testing is often carried out at non-ambient temperatures using ovens, furnaces or cryogenic chambers. Extreme temperature means an operating temperature exceeding 60 °C (140 °F) or below 0 °C (32 °F). You must use protective clothing, such as gloves, when handling equipment at these temperatures.
  • Page 6 Preliminary Pages M10-14179-EN Warnings Hazard - Set the appropriate limits before performing loop tuning or running waveforms or tests. Operational limits are included within your testing system to suspend motion or shut off the system when upper and/or lower bounds of actuator or crosshead travel, or force or strain, are reached during testing.
  • Page 7 Preliminary Pages Warnings Explosion Hazard - Wear eye protection and use protective shields or screens whenever any possibility exists of a hazard from the failure of a specimen, assembly or structure under test. Wear eye protection and use protective shields or screens whenever a risk of injury to operators and observers exists from the failure of a test specimen, assembly or structure, particularly where explosive disintegration may occur.
  • Page 8 Preliminary Pages M10-14179-EN viii...

  • Page 9: Table Of Contents

    Preliminary Pages Table of Contents Chapter 1 Introduction ..........1-1 Purpose.
  • Page 10 Preliminary Pages M10-14179-EN Chapter 3 Installation ..........3-1 Installing to a Load Frame.
  • Page 11 Preliminary Pages Lubrication............Series 2712 .
  • Page 12 Preliminary Pages M10-14179-EN 2712-001 2712-003 2732-003 Samples of 2712 and 2732 Grips...

  • Page 13: Introduction

    Chapter 1 Introduction Outline This chapter introduces the Series 2712 and 2732 pneumatic grips and details the purpose, description and function of the grips. It includes the following sections: • Purpose........... . 1-2 •...

  • Page 14: Purpose

    Purpose M10-14179-EN Purpose Instron Series 2712 and 2732 pneumatic action grips are designed for material testing applications where specimens are difficult to hold in conventional screw- action grips. Pneumatic action grips allow rapid, easy loading of specimens from delicate films to polymers and woven fabrics. This provides a very simple and efficient method for securing test specimens easily and quickly.
  • Page 15 Purpose Upper grip Specimen Lower grip 2712-002 2712-001 Figure 1-1. Series 2712 Typical Grips Figure 1-2. Series 2732 Typical Grips...

  • Page 16: Description

    Table 2-14 on page 2-15 to find compatible jaw faces for your specific grip model. Contact your Instron sales representative for assistance with selecting jaw faces that are suitable for your testing requirements. Figure 1-3 on page illustrates the basic grip components.
  • Page 17 Description Mechanical connection Locknut (2712-018,-019,-020 only) Piston housing Upper Grip Frame Jaw faces Lower Grip Figure 1-3. Basic Grip Components...

  • Page 18: Function

    M10-14179-EN Function All Instron pneumatic grips operate on the same mechanical principle. Pneumatic action grips clamp the specimen through a dual lever arm, actuated by air cylinders built into the grip body. The gripping force can be increased with air pressure to accommodate materials that are often difficult to hold.

  • Page 19: Accessories

    Accessories Accessories A pneumatic foot switch or an automatic grip controller are optional accessories for opening and closing the grips. Foot Switch The pneumatic foot switch is a switch assembly and three air lines. Figure 1-4 illustrates the foot switch. Two hoses from the air outlet lines, marked upper grip and lower grip, have quick disconnect fittings that attach to the corresponding grips.

  • Page 20: Automatic Grip Controller

    Automatic Grip Controller You can operate the grips with an optional automatic grip controller. Controllers are available for Instron electromechanical systems. A grip control unit, foot switch and interconnecting cables comprise the grip controller. The grip control unit is a small rectangular enclosure which mounts to the outside of a load frame column.

  • Page 21: Specifications

    Chapter 2 Specifications Outline This chapter details the specifications for all the various grips. It includes the following sections: • 2712-001 and 2712-013 ........2-2 •...

  • Page 22: 2712-001 And 2712-013

    2712-001 and 2712-013 M10-14179-EN 2712-001 and 2712-013 Specifications Table 2-1. 2712-001 and 2712-013 Specifications Parameter Specification Load capacity 5 N (1 lbf) Test application Tensile Not suitable for through zero/reverse stress or fatigue testing Mechanical connection 2712-001 Upper fitting Type Am Lower fitting Type Dm (1/2 inch Clevis pin) 2712-013 Upper fitting...
  • Page 23 2712-001 and 2712-013 Table 2-2. 2712-001 and 2712-013 Dimensions Letter Measurement Designation Dimension mm (in) Width 60 (2.4) Effective length 2712-001 Upper grip 90 (3.5) Lower grip 125 (4.9) 2712-013 Upper grip 90 (3.5) Lower grip 90 (3.5) Throat depth 28 (1.1) Throat depth 5 (0.2)

  • Page 24: 2712-002 And 2712-019

    2712-002 and 2712-019 M10-14179-EN 2712-002 and 2712-019 Specifications Table 2-3. 2712-002 and 2712-019 Specifications Parameter Specification Load capacity 250 N (56 lbf) Test application Tensile Mechanical connection 2712-002 Upper fitting Type Bm (3/16 inch Clevis pin) Lower fitting Type Dm (1/2 inch Clevis pin) 2712-019 Upper fitting Type O (6 mm Clevis pin) with locknut Lower fitting...
  • Page 25 2712-002 and 2712-019 Table 2-4. 2712-002 Dimensions (Continued) Letter Measurement Designation Dimension mm (in) Throat depth 34 (1.3) Throat depth 9 (0.35) Table 2-5. 2712-019 Dimensions Letter Measurement Designation Dimension mm (in) Width 68.4 (2.7) Effective length 116 (4.6) Throat depth 34 (1.3) Throat depth 9 (0.35)

  • Page 26: 2712-003, 2712-004 And 2712-018, 2712-020

    2712-003, 2712-004 and 2712-018, 2712-020 M10-14179-EN 2712-003, 2712-004 and 2712-018, 2712-020 Specifications Table 2-6. 2712-003, -004, -018, -020 Specifications Parameter Specification Load capacity 1 kN (225 lbf) Test application Tensile Mechanical connection 2712-003 and 2712-004 Upper fitting Type Cm (1/4 inch Clevis pin) Lower fitting Type Dm (1/2 inch Clevis pin) 2712-018 and 2712-020...
  • Page 27 2712-003, 2712-004 and 2712-018, 2712-020 Dimensions Figure 2-3 on page illustrates the dimensions for the 2712-003, 2712-004, 2712-018 and 2712-020 grips. Table 2-7. 2712-003, -004, -018, -020 Dimensions Letter Measurement Designation Dimension mm (in) Width 2712-003 and 2712-004 136 (5.3) 2712-018 and 2712-020 138 (5.4) Effective length...

  • Page 28: Dimensions

    2712-003, 2712-004 and 2712-018, 2712-020 M10-14179-EN Figure 2-3. 2712-003, -004, -018, -020 Dimensions...

  • Page 29: Specifications

    2712-016 2712-016 Specifications Table 2-8. 2712-016 Specifications Parameter Specification Load capacity 2 kN (450 lbf) Test application Tensile Mechanical connection Upper fitting Type Cm (1/4 inch Clevis pin) Lower fitting Type Dm (1/2 inch Clevis pin) Specimen thickness - Maximum 12 mm (0.5 in) with all jaw faces except: 8 mm (0.31 in) with jaw face 2702-060 Refer to...

  • Page 30: Dimensions

    2712-016 M10-14179-EN Figure 2-4. 2712-016 Dimensions 2-10...

  • Page 31: Specifications

    2732-003, 2732-004, 2732-008 and 2732-009 2732-003, 2732-004, 2732-008 and 2732-009 Specifications Table 2-10. 2732-003, 2732-004, 2732-008 and 2832-009 Specifications Parameter Specification Load capacity 1 kN (225 lbf) Test application Tensile Mechanical connection Pneumatic connection Specimen thickness - Maximum 2732-003 and 2732-008 6.35 mm (0.25 in) with all jaw faces except: 2.35 mm (0.09 in) with jaw face 2702-060 2732-004 and 2732-009...
  • Page 32 2732-003, 2732-004, 2732-008 and 2732-009 M10-14179-EN Figure 2-5. 2732-003, 2732-004, 2732-008 and 2732-009 Dimensions 2-12...
  • Page 33 2732-006 2732-006 Specifications Table 2-12. 2732-006 Specifications Parameter Specification Load capacity 100 N (22 lbf) Test application Tensile Mechanical connection Upper fitting Type Bm (3/16 inch Clevis pin) Lower fitting Pneumatic connection Specimen thickness - Maximum 3.2 mm (0.125 in) Refer to Table 2-14 on page...
  • Page 34 2732-006 M10-14179-EN Pullrod Figure 2-6. 2732-006 Dimensions 2-14...

  • Page 35: Compatible Jaw Faces

    Compatible Jaw faces Compatible Jaw faces The 2712-001 and 2712-013 grips include one pair of 9.5 x 9.5 mm (0.375 x 0.375 in) smooth jaw faces. Alternative face sizes or surfaces are not available. The other grip models described in this manual can be equipped with a variety of interchangeable jaw faces in various sizes and surface types.
  • Page 36 Compatible Jaw faces M10-14179-EN Table 2-14. Compatible Jaw faces (Continued) Clamping Area Jaw face (width x height) Grip Model Catalog Number Surface Type mm (in) 2712-003 2702-011 Smooth ground 12 x 38 (0.5 x 1.5) 2712-004 2702-012 Rubber coated 12 x 38 (0.5 x 1.5) 2712-016 2712-018 2702-013...

  • Page 37: Installation

    Chapter 3 Installation Outline This chapter contains procedures for installing the grips. It includes the following sections: • Installing to a Load Frame ........3-2 •...

  • Page 38: Installing To A Load Frame

    Installing to a Load Frame M10-14179-EN Installing to a Load Frame The load string comprises all of the components between a force producing load frame component (actuator or moving crosshead) and a stationary rigid member (base plate or fixed crosshead). This includes the grips, couplings and the specimen.

  • Page 39: Swivel Coupling

    Installing to a Load Frame Swivel Coupling Caution Do not load a swivel coupling with compressive force. Compressive forces can damage the swivel coupling and load cell. A swivel or flexible coupling, connects the upper grip to the load cell. Figure 3-2 on page illustrates this coupling.

  • Page 40: High Temperature Extension Rods

    Installing to a Load Frame M10-14179-EN Grip shank Clevis pin Pin retainer clip Female socket Locknut Figure 3-3. Threaded Coupling High Temperature Extension Rods Figure 3-4 on page illustrates a pair of Series 2732 grips installed in a chamber. Extension rods provide the Series 2732 grips with the maximum amount of travel within an environmental chamber and carry the air pressure to the grip.
  • Page 41 Installing to a Load Frame Swivel coupling Connects to air supply Travel region Environmental chamber Grips Rigid coupling Connects to air supply Figure 3-4. Grips Installed in a Chamber...

  • Page 42: Installing And Removing Jaw Faces

    Installing and Removing Jaw Faces M10-14179-EN Installing and Removing Jaw Faces The following sections detail the installation of jaw faces in the Series 2712 and 2732 pneumatic grips except for the model 2712-001, which has dedicated jaw faces. Equipment You need a pointed probe. Installing Jaw faces Dowel pin Dowel pin...

  • Page 43: Removing Jaw Faces

    Installing and Removing Jaw Faces 5. To expose the mounting face slot and the dowel pin hole, use a small probe to push in on the right hand grip shaft. 6. Insert the dowel pin into the hole in the shaft until it is flush with the inside of the slot.

  • Page 44: Installing Jaw Face Shields

    Installing Jaw Face Shields M10-14179-EN Installing Jaw Face Shields Jaw face shields are available for grips 2732-008 and 2732-009. Jaw face shields reduce the risk of pinching your fingers in the grips as they close on a specimen. The shields are designed so that you can replace the faces with the shields still in place.

  • Page 45: Connecting Pneumatics

    • All grips can be connected to the air supply and operated from an optional grip controller unit. Grip Nozzle All Instron pneumatic grips have a quick release type connector. Figure 3-7 page illustrates the grip nozzle and hose coupling.

  • Page 46: Manual Foot Switch

    Connecting Pneumatics M10-14179-EN Warning Crush Hazard - Take care when installing or removing a specimen, assembly, structure, or load string component. Installation or removal of a specimen, assembly, structure, or load string component involves working inside the hazard area between the grips or fixtures.
  • Page 47 Connecting Pneumatics Foot switch Pedal Figure 3-8. Manual Foot Switch 3-11...

  • Page 48: Automatic Grip Control Unit

    Connecting Pneumatics M10-14179-EN Automatic Grip Control Unit An automatic grip control integrates the grips with the load frame's control system. Figure 3-9 illustrates the grip controller. There are various configurations for each type. Refer to the automatic grip control unit manual for specific installation details.

  • Page 49: Operation

    Chapter 4 Operation Outline This chapter describes the operation of the various types of grips. It includes the following sections: • Preparing for Use ..........4-2 •...

  • Page 50: Preparing For Use

    Preparing for Use M10-14179-EN Preparing for Use General Considerations  The grips are installed and the coupling pins are secure.  The jaw faces are the appropriate size for the test specimen.  The air supply is on, and the air hoses are connected and free of kinks. ...

  • Page 51: Opening And Closing The Grips

    Opening and Closing the Grips Opening and Closing the Grips The method you use to close the grips depends on the configuration of your pneumatic system. Toggle Valve • To close the grip, move the toggle valve away from the specimen. •...

  • Page 52: Installing A Specimen

    Installing a Specimen M10-14179-EN Installing a Specimen Checklist Check for the following conditions before you install a specimen:  The grip coupling pins are secure.  The air pressure supply is on and the pressure setting provides the optimum gripping force on the specimen, without exceeding the grip’s maximum air pressure rating.

  • Page 53: Procedure

    Installing a Specimen Warnings Crush Hazard - Take care when installing or removing a specimen, assembly, structure, or load string component. Installation or removal of a specimen, assembly, structure, or load string component involves working inside the hazard area between the grips or fixtures.

  • Page 54: Removing A Specimen

    Removing a Specimen M10-14179-EN Removing a Specimen Checklist Check for the following conditions before you remove a specimen:  The test is complete and there is no significant load on the specimen.  There is no measuring device, such as an extensometer or LVDT, on the specimen.

  • Page 55: Maintenance

    Chapter 5 Maintenance Outline This chapter contains instructions for maintaining and troubleshooting your grips. It includes the following sections: • Checklist........... 5-2 •...

  • Page 56: Checklist

    Checklist M10-14179-EN Checklist  Lubricate the grips, if necessary. Refer to “Lubrication” on page 5-3.  Check the air supply for correct pressure.  Check the air hoses for damage or excessive wear. Replace if necessary.  Check the jaw faces for excessive wear. Replace if necessary. ...

  • Page 57: Lubrication

    Chapter 6 as a guide. Lubricate the piston seal and piston bore with a petroleum jelly (Instron part #105-1-24). After lubricating, operate the grip several times to ensure that the grip closes smoothly with no air leaks. Piston seal...
  • Page 58 -73° to 175° C Dow Corning 33 (Instron part #105-1-4) (-100° to 350° F) Above 175° C (350° F) Graphite powder dry lubricant (Instron part #105-1-3) G-N paste (Instron part #105-1-28), whichever is supplied with your grip. Procedure 1. Remove the jaw faces. Refer to “Installing and Removing Jaw Faces”...

  • Page 59: Servicing

    Servicing Servicing Review the following list before you service a grip:  Contact Instron Service regarding warranty and repair services.  Before you disassemble the clamps for cleaning or servicing, refer to the drawings in Chapter  Remove the jaw faces before you service the grips, except for the 2712-001 and 2712-013 grips.

  • Page 60: Troubleshooting

    Improper adjustments or the lack of maintenance cause most grip operating problems. When a problem develops, Table 5-1suggests a probable cause and recommends a remedy. If you are unable to solve a problem, contact Instron Service. Note: Before you contact Instron Service, note the model and serial numbers of the test system and make sure there is a telephone at the test site.
  • Page 61 Troubleshooting Table 5-1. Troubleshooting (Continued) Problem Cause Remedy Specimen slips while under load. Wrong size or type of jaw face. Install appropriate jaw faces for specimen size and type. Not enough gripping area. Install specimen for complete engagement with jaw faces. Not enough gripping force.
  • Page 62 Troubleshooting M10-14179-EN...
  • Page 63 Chapter 6 Illustrated Parts Outline This chapter contains instructions to help you identify the grip parts from an exploded-view illustration. A list, corresponding to the grip illustration, contains the component description, and part number and quantity. It includes the following sections: •...

  • Page 64: Finding A Part

    2. Refer to the item number on the illustration. 3. Refer to the item number on the corresponding parts list. Each item number has a part description, Instron part number and quantity. Note: The quantity represents the number of parts for one grip.
  • Page 65 2712-001 and 2712-013 2712-001 and 2712-013 Figure 6-1. 2712-001 Parts Identification...

  • Page 66: 2712-001 And 2712-013

    2712-001 and 2712-013 M10-14179-EN Figure 6-2. 2712-013 Parts Identification...
  • Page 67 2712-001 and 2712-013 Table 6-1. 2712-001 and 2712-013 Parts List Item Description Part Number Quantity Grip frame (right side) T331-8 Jaw face T331-2 Piston housing flange T331-3 Jaw piston T331-4 Piston housing (upper grip) 2712-001 T331-5 2712-013 T563-314 Grip frame (left side) T331-9 Piston housing (lower grip) 2712-001...

  • Page 68: 2712-002 And 2712-019

    2712-002 and 2712-019 M10-14179-EN 2712-002 and 2712-019 Jaw face Figure 6-3. 2712-002 Parts Identification...
  • Page 69 2712-002 and 2712-019 Jaw face Figure 6-4. 2712-019 Parts Identification...
  • Page 70 2712-002 and 2712-019 M10-14179-EN Table 6-2. 2712-002 and 2712-019 Parts List Item Description Part Number Quantity Handle assembly & ball valve A2-44 Piston T2-247 Roller wedge T2-243 Roller link T2-245 Jaw face holder (left side) T2-248 Jaw face holder (right side) T2-249 Transfer lever T2-285...
  • Page 71 2712-002 and 2712-019 Table 6-2. 2712-002 and 2712-019 Parts List (Continued) Item Description Part Number Quantity O-ring 33-2-21 Hose assembly (upper grip) A563-245 Hose fitting (lower grip) T2-1124 Locknut (2712-019 only) T563-635 Jaw face Refer to Chapter 2 Grip identification label shown 2712-002 T2-1120...

  • Page 72: 2712-003 And 2712-004

    2712-003 and 2712-004 M10-14179-EN 2712-003 and 2712-004 Jaw face Figure 6-5. 2712-003 and 2712-004 Parts Identification 6-10...
  • Page 73 2712-003 and 2712-004 Table 6-3. 2712-003 and 2712-004 Parts List Item Description Part Number Quantity Lever and ball valve assembly A2-44 Piston T2-258 Roller wedge T2-259 Roller link T2-261 Jaw face holder (left side) T2-262 Jaw face holder (right side) T2-263 Multiplying link T2-1038...
  • Page 74 2712-003 and 2712-004 M10-14179-EN Table 6-3. 2712-003 and 2712-004 Parts List (Continued) Item Description Part Number Quantity Screw (4-40 x 1/8 in), Set type AA 400A1 Adapter (lower grip) T2-265 Piston housing T2-288 O-ring 33-2-34 Roll pin (3/16 x 7/8 in) 703D102 Screw (4-40 x 1/8 in), Set type AA 400N1...

  • Page 75: 2712-018 And 2712-020

    2712-018 and 2712-020 2712-018 and 2712-020 Jaw face Figure 6-6. 2712-018 and 2712-020 Parts Identification 6-13...
  • Page 76 2712-018 and 2712-020 M10-14179-EN Table 6-4. 2712-018 and 2712-020 Parts List Item Description Part Number Quantity Lever and ball valve assembly A2-44 Piston T2-258 Roller wedge T2-259 Roller link T2-261 Jaw face holder (left side) T2-262 Jaw face holder (right side) T2-263 Multiplying link 2712-018...
  • Page 77 2712-018 and 2712-020 Table 6-4. 2712-018 and 2712-020 Parts List (Continued) Item Description Part Number Quantity Grip frame 2712-018 T2-380 2712-020 T2-274 Screw (4-40 x 1/8 in), Set type AA 400A1 Piston housing T2-788 O-ring 33-2-48 Roll pin (3 x 24 mm) 703F051 Screw (4-40 x 1/8 in), Set type AA 400N1...
  • Page 78 2712-016 M10-14179-EN 2712-016 Upper grip Lower grip Figure 6-7. 2712-016 Parts Identification 6-16...
  • Page 79 2712-016 Table 6-5. 2712-016 Parts List Item Description Part Number Quantity Grip adapter Upper grip T1733-1114 Lower grip T1733-1115 Piston housing T1733-1116 Piston T1733-1117 Roller T1733-1118 Pivot pin T1733-1119 Roller link T1733-1120 Multiplying link T1733-1121 Jaw face holder (right) T1733-1122 Jaw face holder (left) T1733-1123 Jaw frame...
  • Page 80 2712-016 M10-14179-EN Table 6-5. 2712-016 Parts List (Continued) Item Description Part Number Quantity Restrictor T1733-1157 Quick connect hose fitting T2-1125 Washer 78-2-1020 Pneumatic quick exhaust valve 97-8-10 6-18...

  • Page 81: 2732-003 And 2732-004

    2732-003 and 2732-004 2732-003 and 2732-004 Jaw face Figure 6-8. 2732-003 and 2732-004 Parts Identification 6-19...
  • Page 82 2732-003 and 2732-004 M10-14179-EN Table 6-6. 2732-003 and 2732-004 Parts List Item Description Part Number Quantity Wedge roller T2-259 Roller link T2-261 Jaw face holder (left) T2-262 Jaw face holder (right) T2-263 Metal bellows piston seal T2-392 Piston spring T2-453 Multiplying link T2-1038 Piston stem guide...
  • Page 83 2732-006 2732-006 Upper grip Jaw face Lower grip Figure 6-9. 2732-006 Parts Identification 6-21...
  • Page 84 2732-006 M10-14179-EN Table 6-7. 2732-006 Parts List Item Description Part Number Quantity Assembly hose (upper grip) A2-99 Upper pullrod A2-1021 Lower pullrod A2-1023 Spring bellows return T2-519 Grip frame T2-520 Pull rod ring (lower grip) T2-539 Pull rod pin (lower grip) T2-571 Jaw face holder (left) T2-582...

  • Page 85: 2732-008 And 2732-009

    2732-008 and 2732-009 2732-008 and 2732-009 Upper grip Lower grip Figure 6-10. 2732-008 and 2732-009 Parts Identification 6-23...
  • Page 86 2732-008 and 2732-009 M10-14179-EN Table 6-8. 2732-008 and 2732-009 Parts List Item Description Part Number Quantity Wedge roller assembly A2-1048 Roller link T2-261 Jaw face holder (left) T2-262 Jaw face holder (right) T2-263 Metal bellows piston seal T2-392 Piston spring T2-453 Multiplying link T2-1145...
  • Page 87 2732-008 and 2732-009 Table 6-8. 2732-008 and 2732-009 Parts List Item Description Part Number Quantity Top plate T2-1140 Jaw face shields (25mm high x 38mm wide) T621-266 Jaw face shields (38mm high x 50mm wide) T621-267 Thumbscrews for jaw face shields 71-2-69 Jaw faces Refer to...
  • Page 88 2732-008 and 2732-009 M10-14179-EN 6-26...
  • Page 90 Product Support: www.instron.com...

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