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 L Arm/Spoke, Bushed Bore, 0.75 to 2.688 in Bore, 19 in OD, 18.95 in Pitch Diameter, 0.688 in Face Width, MST® Q1 Bushing, 2-1/2 in Overall Length, For Use With: 3V Cross Section Belts, Cast Iron