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What does the S8M in 150-S8M-1000 mean

BlackStar 4B42SD STL - QD Sheave 2-Bolt Pillow Block com/products/d-and-d-10-8vk2650-heavy-duty-v-belt"The BlackStar 4B42SD STL is a 4 groove qd sheave for B section belts, manufactured from cast iron. Requires a QD Type SD Bushing (sold separately) to mount to your shaft. Specifications Part Number 4B42SD STL Product Type QD Sheave Number of Grooves 4 Belt Profile B Outside Diameter 4. 55" Material Cast Iron Approx. Weight 7. 600 lbs Bushing Required QD Type SD Bushing Pitch Diameter 4. 2" Compatible Belts A, B, 4L, 5L Bushing Required This sheave