Both have the same pitch diameter at the top of the hole of internal threads or end of the pipe on external threads, and both have the same thread lengths or depths.
在内螺纹的孔的顶端或者外螺纹的管的端部拥有相同的中径，而且拥有相同的螺纹长度和深度。
2
Effect of stress wave on larger diameter metal pipe was studied by numerical simulation under local external contacting explosion.
以大口径金属管道为对象，通过数值模拟研究了金属管道在局部外接触爆炸荷载作用下的应力波对其的效应。
3
The externaldiameterof the middle part of each guiding expansion head is larger than that of the through pipe.