Hi-Cap® sheaves (narrow V-belts) are manufactured from class 30 gray iron (30000 lb tensile strength) and can have a maximum speed of 6500 fpm. All Martin sheaves are statically balanced. Dynamic balancing should be considered for any sheaves exceeding 5000 lb. Martin Hi-Cap® Wedge Sheave, Type G Web, Bushed Bore, 1/2 to 1-3/4 in Bore, 3.65 in OD, 3.6 in Pitch Diameter, 0.688 in Face Width, MST® P1 Bushing, 1.94 in Overall Length, For Use With: 3V Cross Section Belts, Steel