Ametric® S518 Inch Steel Spur MPB Gear, 14-1/2 Deg 5DP, 18 Teeth, 1-1/16 Inch +/-1/16" Pilot Bore (B), 1-3/4" Face Width (F), 3 Inch Hub Dia (H), 0.875 Inch Hub Projection (P), 2-5/8 Inch total width, 4 Inch OD, (1-125)