NF L22-462:2000 飞机用螺栓和螺母 ISO M或ISO MJ螺纹 公差等级4H5H带锁紧孔、减少高度标称对边左旋普通六角螺母
Aircraft bolts and nuts - Nuts, hexagonal, Plain, reduced height, normal across flats, with locking holes, left-hand ISO M or ISO MJ threads, fine pitch threads, 4H5H tolerance class