... ) Sheaves for taper bushings 3V, 5V, 8V B) Sheaves for QD bushings 3V, 5V, 8V C) Sheaves for split taper bushings ... 3) Bore pilot bore, finish bore, taper bore, bore for QD bushing 4) Surface finish paint, phosphate, zinc plate 5) Material ... .5, AT5, AT10, AT20 2) Pilot bore, taper bore and QD bore 3) Materials 1045 steel, aluminum and stainless steel 4 ...