Jaw Coupling Hub; 5/16" Bore; 1.08" Hub Dia; Jaw Coupling; Hub; Shaft; Finished Bore; No Keyway; 1.08" Outside Diameter; 0.63" Length Thru Bore; L050 Size or Series; Set Screw; Powdered Metal; 18000 Maximum Speed; Buna-N 26.3 | Hytrel/Bronze 50 | Urethane 39.45In-Lbs Torque