标准摘要 Cross Reference: AMS2485,AMS2640,AMS6322,ANSIB46.1,ANSIY14.5M,AS870 展开完整摘要 英文名称BOLT-MACHINE, DOUBLE HEXAGON, EXTENDED WASHER HEAD, PD SHANK, STEEL (SAE 8740), BLACK OXIDE, .2500-28 UNF-3A