Threaded Fastener Grips for Bolt and Nut Tensile Testing

Threaded fastener grips are used for axial tension testing of bolts, screws, studs, and nuts. Instead of clamping the outside of the part, they hold it by its own threads so the load is applied the way the fastener actually carries it in service.

This makes them the standard choice for fastener strength and proof testing. To match a set to your fasteners, request a personal quote.

These fixtures use threaded adapters or holders that engage directly with the part’s threads, rather than gripping it externally. The load then passes through the fastener itself, reflecting how it is loaded in a real joint.

Loading through the threads is what gives a representative strength result. Learn more about our tensile testing equipment.

Clamping a fastener externally can damage it and does not reflect how it carries load. Engaging the threads applies the load through the same path used in service, which gives a more representative strength and proof result.

This is why threaded engagement is the standard approach for fastener testing. To discuss your fasteners, talk to our team.

They are used to evaluate tensile strength, yield characteristics, and proof load for fasteners, commonly in accordance with ASTM F606. ASTM F606 sets out the methods for determining the mechanical properties of externally and internally threaded fasteners.

These are the core acceptance properties for structural and mechanical fasteners. See our standards and certification.

The right choice depends on a few things:

• The fastener type and thread size
• The peak load, often above 100 kN
• The standard, such as ASTM F606

Those set the grip and inserts you need. Email sales@tensilemillcnc.com.

In proof load testing, a nut is installed on a hardened threaded mandrel and loaded to a specified tension to confirm the threads hold without failing. It verifies that the fastener can carry its rated load without stripping or permanent deformation.

Passing proof load is a key check for safety-critical fasteners. To set up a proof load test, request a personal quote.

They handle the main threaded fastener types:

• Bolts and screws
• Studs
• Nuts

Interchangeable threaded inserts adapt the grip to different thread sizes. Explore the full grips and fixtures range.

Yes. Interchangeable threaded inserts are available to match different thread sizes, so one grip body can test a range of fasteners by swapping the insert.

Matching the insert to the thread is what ensures full engagement and a secure test. See related consumables and spare parts.

They support fastener testing in accordance with ASTM F606, which defines how the mechanical properties of threaded fasteners are determined. The fixture is matched to the specific test and fastener.

This makes them suitable for both quality control and certification. See our standards and certification.

They are manufactured from high-strength steel to support elevated load capacities, often exceeding 100 kN. That capacity suits the high forces structural and aerospace fasteners can require.

Matching grip capacity to your fastener’s strength is important for a valid test. To confirm capacity, request a personal quote.

They are used in automotive, aerospace, construction, and mechanical testing environments, wherever fastener strength has to be verified. These sectors depend on documented fastener performance.

Consistent testing supports safety and traceability in each of them. Explore the full grips and fixtures range.

Yes. They provide consistent test alignment, which keeps the load axial through the fastener and produces measurable, repeatable data for quality control and certification.

Good alignment is essential for valid fastener results. Learn more about our tensile testing equipment.

You can request a personal quote or order online. Sharing your fastener types, thread sizes, and load lets us recommend the right grip and inserts.

For a configuration matched to your testing, request a personal quote.