BlackStar 80BS55 1 1/2 K2S - 80 Pitch Finished Bore Sprocket - 55 Tooth - 1-1/2" Bore 35mm Prefer our D&D Global equivalent:

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The Turner UCST212 60MM is a take-up unit mounted bearing unit with a 60mm bore

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What does the 5M in 1105-5M-25 mean

BlackStar 80BS55 1 1/2 K2S - 80 Pitch Finished Bore Sprocket - 55 Tooth - 1-1/2" Bore 35mm Prefer our D&D Global equivalent:The BlackStar 80BS55 1 1 2 K2S is a 80 pitch Finished Bore roller chain sprocket with 55 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 1 2" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 80BS55 1 1 2 K2S Chain Pitch 80 Number of Teeth 55 Bore Size 1 1 2" Minimum Bore 1 3 8" Maximum Bore 2 15 16"