BlackStar 60B21 - 60 Pitch B-Hub Sprocket - 21 Tooth 38mm com/products/diesel-belting-22pk1320-micro-v-micro-v-belt"

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so the Megadyne 2/C144 interchanges with Gates

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Dayco 4/B141

BlackStar 60B21 - 60 Pitch B-Hub Sprocket - 21 Tooth 38mm com/products/diesel-belting-22pk1320-micro-v-micro-v-belt"The BlackStar 60B21 is a 60 pitch B Hub roller chain sprocket with 21 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. Specifications Part Number 60B21 Chain Pitch 60 Number of Teeth 21 Minimum Bore 3 4" Maximum Bore 2 3 4" Bore Type Plain Bore Hub Style B Hub Strand Count Single Material Steel Outside Diameter 5. 43" Pitch Diameter 5. 033" Approx. Weight 5. 10 lbs Cross