2.810" hole diameter 3.240" outside diameter 0.046" material thickness internal keys 180 deg apart offset 16 deg 22 min from center line of external keys zinc surface treated key
0.320" hole diameter 0.492" outside diameter 0.039" material thickness o/d chamfered at 45 deg angle, 0.020 in. min, 0.030 in. max anodize surface treated shouldered