BlackStar 1VP50 1/2 TYPE 1 - Variable Pitch Sheave - 1/2 TYPE 1" Bore 35mm "text": "20/A139 has a top

"text": "20/A139 has a top width of 12

What does the S8M in 250-S8M-776 mean

com/s/files/1/0666/7721/products/Flat_Idler_cdc76829-8277-404a-9c80-0045a9889641

120-S8M-1600 has a 8 mm tooth pitch

BlackStar 1VP50 1/2 TYPE 1 - Variable Pitch Sheave - 1/2 TYPE 1" Bore 35mm "text": "20/A139 has a topThe BlackStar 1VP50 1 2 TYPE 1 is a 1 groove variable pitch sheave, manufactured from cast iron. Specifications Part Number 1VP50 1 2 TYPE 1 Product Type Variable Pitch Sheave Number of Grooves 1 Bore Size 1 2 TYPE 1" Material Cast Iron Approx. Weight 3. 6 lbs Belt Profile A B (Variable Pitch) Cross references: Browning 1VP50 1 2 TYPE 1