The Universal Grip Company products

The 1,000 lb. wedge grip is quite narrow and is designed to pinch the sample with an increasing amount of force. This solution is great for thin, non-flexable samples.

This grip is great for lower strength plastics and is used commonly in plastics tensile tests such as ASTM D638. The handle is used to tighten the sliding grip jaws onto the sample before the test starts.

4,500 lb. grips start to become heavy. These grips weigh about 25 lbs. each. Check out the literature page for a 3D schematic of the working principle.