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Select Grips and Fixtures
Product Support: www.instron.com
D (female) connector to a grip with a Type O (male) connector you require a Type Dm to
Of adapter.
Select Grips and Fixtures
A set of grips are installed on the system during installation by a service engineer. If your
testing requires it, you may need to install a different set to obtain optimum test results.
The selection of grips depends on the material, geometry and strength of the test
specimen.
In compression testing, the diameter or area of the anvil is important, in addition to the
maximum loading capacity.
For tensile testing:
• Make sure the tensile strength of the specimen does not exceed the maximum
loading capacity of the grips.
• Minimize the risk of slippage by:
• selecting jaw faces with a surface area large enough to cover the tab (for
dumbbell-shaped specimens) or as much surface area as possible for parallel-
sided specimens.
• ensuring that the specimen is gripped by at least 75% of the available jaw face
length.
• using serrated jaw faces
• Breaks at the jaw face may be caused by:
• Screw action grips - you may be using too much force when tightening the grips.
Use a torque wrench or switch to pneumatic grips for a consistent force.
• Pneumatic grips - the pressure may be too high. Drop the pressure, but not to
the point where you get slippage.
• Serrated faces - the serrations are damaging the specimen. Change to faces
that have more serrations per inch (less bite) or cover with masking tape or
similar material to soften the bite and prevent damage to the specimen.
Insert Jaw Faces into Grips
Different grips use different mechanisms for attaching jaw faces. Refer to the
documentation supplied with the grips for more information.
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