标 准 编 号：DIN 40431-1-1970 简体中文标题：钢制导线管螺纹.螺纹量规.过端和不过端螺纹环规 繁体中文标题：钢制导线管螺纹.螺纹量规.过端和不过端螺纹环规 English Name：Steel Conduit Thread; Thread Gauges, "Go" and "Not go" Thread Ring Gauges...