BlackStar 4-3V560SDS STL - QD Sheave Series-XTB45 What does the H in

What does the H in 390H150 mean

12/SPC2800 has a top width of 304

com/s/files/1/0666/7721/products/J_Section_77ff4d24-2d85-44bb-a5e3-ff65c3a3036b

so the 5L460 interchanges with Gates 5L460

578" Approx

BlackStar 4-3V560SDS STL - QD Sheave Series-XTB45 What does the H inThe BlackStar 4 3V560SDS STL is a 4 groove qd sheave for 3V section belts, manufactured from cast iron. Requires a QD Type SDS Bushing (sold separately). Specifications Part Number 4 3V560SDS STL Product Type QD Sheave Number of Grooves 4 Belt Profile 3V Outside Diameter 5. 60" Bushing Required QD Type SDS Bushing Material Cast Iron Approx. Weight 7. 500 lbs Pitch Diameter 56. 0" Compatible Belts 3V Bushing Required This sheave requires a QD Type SDS