BlackStar H80A31R - 80 Pitch A-Plate Sprocket - 31 Tooth 8MK Section The 4/B70 has a 21/32"

The 4/B70 has a 21/32" width

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BlackStar H80A31R - 80 Pitch A-Plate Sprocket - 31 Tooth 8MK Section The 4/B70 has a 21/32"The BlackStar H80A31R is a 80 pitch A Plate roller chain sprocket with 31 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 H80A31R Chain Pitch 80 Number of Teeth 31 Bore Type Plain Bore Hub Style A Plate Strand Count Single Material Steel Hardened Teeth Yes Approx. Weight 59. 8 lbs Cross