Jaw Coupling Hub; 1-15/16" Bore; 4" Hub Dia; Jaw Coupling; Hub; Shaft; Finished Bore; Keyway; 4.5" Outside Diameter; 1.94" Length Thru Bore; L190 Size or Series; Set Screw; Cast Iron; 5000 Maximum Speed; Buna-N 1726 | Hytrel/Bronze 4680 | Urethane 2589In-Lbs Torque