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BlackStar H100E21 - 100 Pitch QD Sprocket - 21 Tooth Stainless Steel Taper-Lock Bushings com/products/d-and-d-244mxl787-timing-belt"The BlackStar H100E21 is a 100 pitch QD 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 requires a QD Type E Bushing (sold separately). Specifications Part Number H100E21 Chain Pitch 100 Number of Teeth 21 Maximum Bore 3 1 2" Bore Type QD Hub Style QD Bushing Required QD Type