These grips and fixtures typically mount to a NextGen universal testing machine using a clevis-and-pin style connection or a frame-specific adapter, so the required clevis size is the one that matches both the grip’s connection interface and your frame’s upper and lower attachment points.

The exact adapter set depends on your configuration, especially:

• Your frame series and capacity class (benchtop electromechanical vs higher-force floor models, or hydraulic frames)
• The connection style on the frame (pin-style clevis, threaded stud, or other mounting hardware)
• Whether you are changing only the upper, only the lower, or both connections
• The specific grip family and size you are installing (for example wedge, side-action, pneumatic, bending, compression)

For the fastest fit check, confirm what is currently on your machine, including the upper and lower clevis geometry and any existing adapter blocks, then match the grip connection to that same interface so you maintain alignment and avoid off-axis loading.

If you want to confirm the right clevis adapters for your frame and the grips you are considering, use learn more and request a quote.