BlackStar R1 1 11/16 - Split Taper Bushing - 1 11/16" Bore TL3030 The BlackStar 50Q37 is a

The BlackStar 50Q37 is a 50 pitch Q roller chain sprocket with 37 teeth

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6 Multi-Duty Sheaves - QD 78313132"

The BlackStar H50P17 is a 50 pitch Taper Lock roller chain sprocket with 17 teeth

so a 3/BK81 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

BlackStar R1 1 11/16 - Split Taper Bushing - 1 11/16" Bore TL3030 The BlackStar 50Q37 is aThe BlackStar R1 1 11 16 is a R1 series split taper bushing with a 1 11 16" finished bore, precision manufactured from high grade steel. Split Taper bushings use a two piece split design for easy shaft mounting and are ideal for sheaves, sprockets, and couplings. Specifications Part Number R1 1 11 16 Bushing Type Split Taper Series R1 Bore Size 1 11 16" Minimum Bore 1 1 8" Maximum Bore 2 13 16" Outside Diameter 4. 000" Length 2 7 8" Material Steel