Shoulder Grip Fixtures for Pull-Off and Component Strength Testing

Shoulder grip fixtures hold specimens that have an enlarged head, flange, or formed end that cannot be gripped with standard jaw clamps. Instead of squeezing the body of the part, the fixture applies load through the shoulder, which is how many of these parts actually carry force in service.

They are used for pull-off, push-out, and component strength evaluations across a wide range of parts. To match a fixture to your specimen, request a personal quote.

The specimen sits against a recessed ledge or collar that supports its head or flange, while the testing machine applies axial load from the other end. Because the load passes through the shoulder rather than a clamped body, parts that jaws cannot grip are tested cleanly.

This support also spreads the load across the shoulder to reduce bending and keep the specimen aligned. Learn more about our tensile testing equipment.

Choosing the right fixture comes down to a few things:

• The head or flange geometry that has to be supported
• The peak load the test will reach
• The standard and industry you test for

With those in hand, the size and configuration follow. For a recommendation, email sales@tensilemillcnc.com.

Shoulder fixtures suit a broad set of parts with a head or flanged feature, including:

• Bolt head retention tests and fastener hold strength
• Cable termination pull tests
• Syringe plunger withdrawal tests
• Mechanical anchors, buttons, and bottle caps

Anywhere a formed end has to carry load, a shoulder fixture provides a clean way to test it. Explore the full grips and fixtures range.

These fixtures are built for tests where force is applied through a shoulder, head, or flange, including:

• Pull-off tests
• Push-out tests
• Component strength evaluations

In each case the goal is to load the part the way it is loaded in real use. To set up one of these tests, request a personal quote.

Many parts have an enlarged head or flange that is the feature carrying load in service, and standard jaws either cannot grip them or would distort the part. Loading through the shoulder reproduces the real service condition and gives a result that reflects how the part performs.

It also avoids crushing or marking delicate or formed features. To discuss your part, talk to our team.

They are widely used wherever component strength and retention matter, including:

• Medical device testing
• Automotive and mechanical component assessment
• Packaging evaluation
• Construction anchoring validation

The same fixture family covers many of these because the loading principle is shared. For a fit to your sector, talk to our team.

Shoulder fixtures are built to meet ASTM, ISO, and related test procedures for pull-off, push-out, and component strength testing. The exact method depends on the part and industry, from medical to construction.

We can align a fixture to the specific standard you follow. See our standards and certification.

The recessed ledge or collar supports the shoulder evenly, which distributes the load across the shoulder region rather than concentrating it at one point. That reduces bending and keeps the load axial through the specimen.

Good alignment here is what keeps pull-off and component results consistent. Learn more about our tensile testing equipment.

Yes. Mechanical anchors and fastener hold strength are common uses, where the fixture applies pull-off load through the anchor or fastener head to validate its holding capacity. This supports construction anchoring validation.

High-retention parts are well suited to shoulder loading. For an anchor or fastener test, request a personal quote.

Yes. They are produced in multiple sizes and configurations so the ledge or collar matches the head or flange of your specimen. Matching the fixture to the part is what ensures the shoulder is fully supported during the test.

Sharing your part dimensions lets us recommend the right size. For a sized fixture, request a personal quote.

Yes. A common application is the syringe plunger withdrawal test, where the fixture supports the syringe while axial load is applied to the plunger. This makes shoulder fixtures a good fit for medical device component testing.

They handle the delicate, formed features these parts often have. To set up a medical component test, request a personal quote.

Yes. Buttons, bottle caps, and similar closures are tested by supporting the formed feature and applying load through it, which is exactly what a shoulder fixture does. This supports packaging evaluation and closure strength work.

Different cap and closure shapes are handled by matching the fixture size. For a packaging setup, request a personal quote.

You can request a personal quote or order online. Sharing your part shape, load, and test standard lets us recommend the right size and configuration for your work.

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