Collet, 9BS, 5/16" 

5/16" Brown & Sharpe #9 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 1/2"-13, the width at the top is 1.067" and the width at the bottom is 0.900". Overall length is 4.00".