Threaded-grip fixtures are available for bolt, nut, and other threaded fastener testing, including proof testing setups where the goal is to verify thread integrity and load-holding capability without stripping or fracture. These fixtures engage the specimen by its threads using dedicated adapters or holders, so the load is applied axially and consistently through the fastener geometry.

For typical proof-load testing, the nut is assembled onto a hardened threaded mandrel and loaded in tension to the required proof level, then evaluated for thread damage or permanent deformation. Threaded-grip systems can also be configured for tensile-to-failure testing of bolts, studs, and screws when that is part of your test plan.

Selection usually depends on a few practical details:

• Fastener type (bolt, nut, stud) and whether you are testing proof load or ultimate tensile strength
• Thread form and size range, plus any fine-pitch requirements
• Your UTM frame type and the connection style used at the crosshead and base
• Alignment needs and any required inserts, mandrels, or adapters

If you want to confirm the right threaded-grip and proof-test configuration for your fasteners and UTM, use learn more or request a quote.