Preventing specimen pullout at elevated loads starts with using a grip that is designed to maintain holding force as load increases, then verifying the specimen is fully seated and aligned before you approach peak force.

Match the grip mechanism to the specimen and load risk. Wedge-action and other self-tightening designs increase clamping as tensile load rises. For soft or low-friction materials, self-tightening or controlled-pressure pneumatic grips help maintain consistent engagement. For wire and cable, snubbing or capstan-style grips spread load through wrap friction to reduce slip and jaw-side breaks.

Use jaw faces that fit the surface and geometry, then keep them in good condition. Interchangeable jaw options such as smooth, serrated, knurled, or rubber-coated faces help you balance holding power versus specimen damage. Replace worn inserts and keep jaw faces clean so the contact condition is repeatable.

Run a quick pre-load check to confirm the specimen is centered, the load train stays axial, and the grips remain stable. As a simple safety practice, keep hands out of the grip zone during loading and maintain a clear line of fire in case the specimen releases suddenly.

If you want to confirm the right grip style and jaw configuration for your specimen material and target loads, review the options on learn more and request a quote.