... idlers g) Taper lock pulleys h) Timing pulleys i) Sheave2) V-belts: SPZ, SPA, SPB, SPC; A, B, C, Z, wrapped V ... , 2BKH, 3BK e) Adjustable sheaves: poly V-pulley, multi-pitch H, L, J, K and M3) Bore: pilot bore, finish bore ... solid hub c) Adjustable speed v-belt pulleys d) Flat belt pulleys2) American standard: a) Sheaves for taper bushes: 3V, 5V, 8V ...