Jaw Coupling Hub; 3/8" Bore; 1" Hub Dia; Jaw Coupling; Hub; Shaft; Finished Bore; Keyway; 1.25" Outside Diameter; 0.844" Length Thru Bore; FC12 Size or Series; Set Screw; Steel; 3450 Maximum Speed; Bronze 200 | Rubber 65 | Polyurethane 125In-Lbs Torque