ANSI Type B / BS finished bore sprockets have a hub on one side with two set screws and a keyway.  All Type B / BS Nitro sprockets have a black oxide finish.


Fits ANSI Chain Size: #50
Bore (D1): 1-3/16"
Number Of Teeth: 20
Outside Diameter (de): 4.321"
Sprocket Thickness (B1): 0.343" (Not including Hub)
Hub Diameter (dm): 3"
LTB - Length Thru Bore (A): 1"
Keyway Size: 1/4" X 1/8"
Hardended Teeth: Yes (30-45Rc)
Number Of Setscrews: 2


Interchange Numbers:

50BS20-1-3/16
50BS20H-1-3/16