美国标准锥管螺纹外螺纹  npt external thread; npt ext thd

外螺纹螺旋扁管  twisted fin - tube

螺纹检查台  thread inspecting stand

螺纹螺规  female thread gage

检查②检查法  denitrators

1级外螺纹  class 1A

带内外螺纹的L形短管  street ell

带内外螺纹的三通管  street tee

带内外螺纹的弯管接头  street elbow

堆外检查  Out-of-pile inspection

红外检查  infra-red inspection

机夹外螺纹车刀  mechanically-clamped turning tool for external threading

两端分别带有内外螺纹的大小头  female-male reducer

螺纹外径  full diameter of thread; major diameter of thread

美国标准锥管螺纹外接头  npt male fitting

内螺纹外翅片铸铁管  Casting tube with female screw and side fins

内螺纹外肋片铸铁换热管  Cast iron heat exchange tube with inner corrugation and outer fins

内外螺纹车刀  internal or external threading tool

内外螺纹接合器  intersex adapter