BlackStar 60BS42 1 15/16 K2S - 60 Pitch Finished Bore Sprocket - 42 Tooth - 1-15/16" Bore 3.7/8" so a 4/3V630 from any

so a 4/3V630 from any major manufacturer shares the same cross-section and length and runs on the same sheaves

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"sku":"TB770075539964"

Boston Gear RS140C45

BlackStar 60BS42 1 15/16 K2S - 60 Pitch Finished Bore Sprocket - 42 Tooth - 1-15/16" Bore 3.7/8" so a 4/3V630 from anyThe BlackStar 60BS42 1 15 16 K2S is a 60 pitch Finished Bore roller chain sprocket with 42 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 15 16" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 60BS42 1 15 16 K2S Chain Pitch 60 Number of Teeth 42 Bore Size 1 15 16" Minimum Bore 1" Maximum Bore 2 7