Ball Bearing Idler Sprocket Bore Diameter 5/8 in Chain Number 60 Sprocket Material Steel Number of Teeth 13 Outside Diameter 3.49 in Bearing Material Steel Bearing Type Ball Length through Bore 23/32 in Lubrication Not Required Maximum Radial Load at Speed 230 lb @ 1200 rpm 262 lb @ 900 rpm 298 lb @ 600 rpm 360 lb @ 300 rpm 530 lb @ 100 rpm Pitch Diameter 3.134 in Sprocket Width 0.72 in Teeth Heat Treatment Hardened Teeth Tightener Shaft Required None