1-1/4" Bore; 815 | 820 | 831 | 4705 | 4706 | 4707 | 5705 | 5706 | SSB; 1-1/2" Pitch; 25 Teeth; 6.07" Outside Diameter; 6-1/32" Pitch Diameter; A-No Hub; Finished Bore; Round; Straight Running | Back Flexing; Thermoplastic