50BS31 Sprocket With 1-3/16" Finished Bore 50 Poly Steel Chain it is essential to note

it is essential to note that the inside diameter of our 16B hollow pin is 8

Roller Diameter (D1): 12

Sprocket Size: 08B22

the 6217 bearing features raceways that are precision honed to a superb finish

Sprocket Size: 40JA19

50BS31 Sprocket With 1-3/16" Finished Bore 50 Poly Steel Chain it is essential to noteThis 50BS31 sprocket features a 1 3 16" finished bore including a key way and two setscrews. It is a durable, high quality, and precision sprocket that fully meets all ANSI Standards which insures proper contact between the #50 roller chain and sprocket thus preventing premature wear or breakage. This sprocket is also black oxide coated which increases resistance to the environment and will prevent early rust build up. We also offer stock bore