Collet, 7BS, 5/16" 

5/16" Brown & Sharpe #7 taper round collet to fit spindles with a Brown & Sharpe taper. This collet is made from high-grade tool steel and is precision ground and hardened. Maximum runout is 0.0008” (0.02 mm).

Drawbar thread is 3/8"-16, the width at the top is 0.725" and the width at the bottom is 0.600". Overall length is 3.15".