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: #60
Bore (D1): 1-5/8
Number Of Teeth:15
Outside Diameter (de): 3.979"
Sprocket Thickness (B1): 0.459" (Not including Hub)
Hub Diameter (dm): 2-7/8
LTB - Length Thru Bore (A): 1-1/4 "
Keyway Size: 3/8" X 3/16"
Hardended Teeth: Yes (30-45Rc)