阀门零部件 卡套、卡套螺母
Components of valves--Sockets and guide and nuts
2008-02-01
JB/T 1726-2008
阀门零部件 阀瓣盖和对开圆环
Components of valves--Disc nuts and bisect rings
2008-02-01
ISO 6305-4-1985
Railway components — Technical delivery requirements — Part 4: Untreated steel nuts and bolts and high-strength nuts and bolts for fish-plates and fastenings
铁路部件——交货技术要求第4部分:鱼尾板和紧固件用未经处理的钢制螺母和螺栓以及高强度螺母和螺栓