标准摘要 Cross Reference: AMS2645,AMS2645K,AMS5643,AMS7474,AMS7474C 展开完整摘要 英文名称BOLT, MACHINE - HEXAGON HEAD, DRILLED, 1 HOLE, PD SHANK, CRES (UNS S17400), .5000-20 UNJF-3A