BlackStar H80BS40 2 7/16 K2S - 80 Pitch Finished Bore Sprocket - 40 Tooth - 2-7/16" Bore 3.15/16" "mpn":"TB072053751239"

"mpn":"TB072053751239"

so a 25AT5/825US from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

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BlackStar H80BS40 2 7/16 K2S - 80 Pitch Finished Bore Sprocket - 40 Tooth - 2-7/16" Bore 3.15/16" "mpn":"TB072053751239"The BlackStar H80BS40 2 7 16 K2S is a 80 pitch Finished Bore roller chain sprocket with 40 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 2 7 16" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number H80BS40 2 7 16 K2S Chain Pitch 80 Number of Teeth 40