BlackStar H50BS21 5/8 K2S - 50 Pitch Finished Bore Sprocket - 21 Tooth - 5/8" Bore B-Hub com/products/continental-32494-auto-v-belt"

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so the 6/B105 interchanges with Gates 6/B105

The Gates TP187L050 PowerGrip Twin Power Timing Belts is a synchronous timing belt with L-pitch profile

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BlackStar H50BS21 5/8 K2S - 50 Pitch Finished Bore Sprocket - 21 Tooth - 5/8" Bore B-Hub com/products/continental-32494-auto-v-belt"The BlackStar H50BS21 5 8 K2S is a 50 pitch Finished Bore roller chain sprocket with 21 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 5 8" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number H50BS21 5 8 K2S Chain Pitch 50 Number of Teeth 21 Bore Size