... grooves b. Adjustable speed V-belt pulleys and variable speed pulleys c. Flat belt pulleys and conveyor belt pulleys 2. American standard ... : 3V, 5V, 8V b. Sheaves for 3L, 4L or A, and 5L or B belts: AK, AKH, 2AK, 2AKH, BK, BKH ... c. Adjustable sheaves: poly V-pulley, multi-pitch H, L, J, K and M 3. Material: cast iron, ductile iron, nylon, aluminum, Stainless ...