BlackStar H40BS21 3/4 K2S - 40 Pitch Finished Bore Sprocket - 21 Tooth - 3/4" Bore P14M "text": "The SPZ1637 has a

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"mpn":"TB072053400298"

"text": "1345K10 has 10 ribs and a 135

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The BB71 has a 21/32" width

BlackStar H40BS21 3/4 K2S - 40 Pitch Finished Bore Sprocket - 21 Tooth - 3/4" Bore P14M "text": "The SPZ1637 has aThe BlackStar H40BS21 3 4 K2S is a 40 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 3 4" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number H40BS21 3 4 K2S Chain Pitch 40 Number of Teeth 21 Bore Size