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The BlackStar H40BTL21 is a 40 pitch Taper Lock roller chain sprocket with 21 teeth
com/s/files/1/0666/7721/products/L_G_Spec_App_98f3959d-56e7-45b9-be35-546f68f314b3
so a 1037K6 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves
Cross-references: Browning E 1
12/8V4500 is a standardized industry size
BlackStar 1-3V220JA STL - QD Sheave flexco-550 The BlackStar H40BTL21 is aThe BlackStar 1 3V220JA STL is a 1 groove qd sheave for 3V section belts, manufactured from cast iron. Requires a QD Type JA Bushing (sold separately). Specifications Part Number 1 3V220JA STL Product Type QD Sheave Number of Grooves 1 Belt Profile 3V Outside Diameter 2. 20" Bushing Required QD Type JA Bushing Material Cast Iron Approx. Weight 0. 440 lbs Pitch Diameter 22. 0" Compatible Belts 3V Bushing Required This sheave requires a QD Type JA
