BlackStar H50A55 - 50 Pitch A-Plate Sprocket - 55 Tooth 3.3/4" so a 25T5/450R from any

so a 25T5/450R from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

so a 3/B270 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

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Belt Section AX Sub-Type Cogged Width 1/2" Thickness 5/16" Length 76 in Material Neoprene Reinforcement Polyester Cord Color Black Performance Premium Temperature Range -30°F to 185°F

BlackStar H50A55 - 50 Pitch A-Plate Sprocket - 55 Tooth 3.3/4" so a 25T5/450R from anyThe BlackStar H50A55 is a 50 pitch A Plate roller chain sprocket with 55 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 H50A55 Chain Pitch 50 Number of Teeth 55 Bore Type Plain Bore Hub Style A Plate Strand Count Single Material Steel Hardened Teeth Yes Outside Diameter 11. 50" Pitch Diameter