BlackStar H50BS27 1 1/4 K2S - 50 Pitch Finished Bore Sprocket - 27 Tooth - 1-1/4" Bore TL2012 150-S8M-1224 has a 8 mm

150-S8M-1224 has a 8 mm tooth pitch

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so a 3/C345 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

BlackStar H50BS27 1 1/4 K2S - 50 Pitch Finished Bore Sprocket - 27 Tooth - 1-1/4" Bore TL2012 150-S8M-1224 has a 8 mmThe BlackStar H50BS27 1 1 4 K2S is a 50 pitch Finished Bore roller chain sprocket with 27 teeth, precision manufactured from SAE 1045 steel with induction hardened teeth for extended wear life and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 1 4" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number H50BS27 1 1 4 K2S Chain Pitch 50 Number of Teeth 27 Bore