BlackStar 6TB74 STL - Fixed Bore Sheave TL1310 What does the H in

What does the H in 315H075 mean

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Specifications Part Number H160A70 Chain Pitch 160 Number of Teeth 70 Bore Type Plain Bore Hub Style A-Plate Strand Count Single Material Steel Hardened Teeth Yes Approx

1230M4 has 4 ribs

"sku":"374K15-D&D"

BlackStar 6TB74 STL - Fixed Bore Sheave TL1310 What does the H inThe BlackStar 6TB74 STL is a 6 groove qd sheave for B section belts, manufactured from cast iron. Specifications Part Number 6TB74 STL Product Type QD Sheave Number of Grooves 6 Belt Profile B Outside Diameter 7. 75" Material Cast Iron Approx. Weight 1. 00001 lbs Cross references: Browning 6TB74 STL, Martin 6TB74 STL, Maska 6TB74 STL