BlackStar D50P22H - Double Strand 50 Pitch Taper Lock Sprocket - 22 Tooth 3.5/8" What does the S8M in

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BlackStar D50P22H - Double Strand 50 Pitch Taper Lock Sprocket - 22 Tooth 3.5/8" What does the S8M inThe BlackStar D50P22H is a 50 pitch double strand Taper Lock roller chain sprocket with 22 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket requires a Taper Lock Bushing (sold separately). Specifications Part Number D50P22H Chain Pitch 50 Number of Teeth 22 Bore Type QD Hub Style Taper Lock Bushing Required Taper Lock Bushing Strand Count Double Material