BlackStar H100A25 - 100 Pitch A-Plate Sprocket - 25 Tooth Pitch-240 so a 250-S5M-845 from any

so a 250-S5M-845 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

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The Gates T10-2250-50 Synchro-Power Polyurethane Belts 77622438 is a synchronous timing belt with T10-pitch profile

2/SPC6875 is a banded v-belt used on industrial drives - fans and blowers

BlackStar H100A25 - 100 Pitch A-Plate Sprocket - 25 Tooth Pitch-240 so a 250-S5M-845 from anyThe BlackStar H100A25 is a 100 pitch A Plate roller chain sprocket with 25 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. Specifications Part Number H100A25 Chain Pitch 100 Number of Teeth 25 Bore Type Plain Bore Hub Style A Plate Strand Count Single Material Steel Hardened Teeth Yes Outside Diameter 10. 65" Pitch