BlackStar DS100R21H - Double-Single 100 Pitch R Sprocket - 21 Tooth CX 6/BX70 is a standardized industry

6/BX70 is a standardized industry size

so a 3/3V560 from any major manufacturer shares the same cross-section and length and runs on the same sheaves

3/8VK1320 Banded V-Belt

The SPA4500 has a 12

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BlackStar DS100R21H - Double-Single 100 Pitch R Sprocket - 21 Tooth CX 6/BX70 is a standardized industryThe BlackStar DS100R21H is a 100 pitch double single strand R 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 DS100R21H Chain Pitch 100 Number of Teeth 21 Bore Type Plain Bore Hub Style R Strand Count Double Single Material Steel Outside Diameter 9. 04" Pitch Diameter 8. 388" Approx. Weight 23. 100 lbs Compatible