Inspect jaw faces routinely, ideally before each test series and anytime you change specimen material, thickness, or surface condition. Replacement is not calendar-based, it should be driven by visible wear and by whether the grips can hold the specimen without slip at your normal clamping setup.

In practice, jaw faces should be cleaned and visually checked for damage, then replaced when you see any of the following:

• Rounded, polished, or uneven serrations or knurling
• Embedded debris, galling, or corrosion that marks specimens or reduces contact
• Recurring specimen slip, especially at lower-than-expected loads
• Mismatched jaw sets that no longer clamp evenly across the specimen width

How quickly jaw faces wear depends on what you test and how you clamp, including material hardness, surface coatings, load level, alignment, and whether you use smooth, serrated, or rubber-coated jaw options. Keeping faces clean, using the correct face style, and replacing jaws in matched pairs typically helps maintain repeatability.

If you want to confirm the best jaw face style and a practical inspection routine for your specific specimens and grip type, learn more or request a quote.