2.2 螺紋
左螺紋left hand thread
右螺紋 right hand thread
管螺紋 pipe thread
錐管螺紋 taper pipe thread
直管螺紋straight pipe thread
梯形螺紋 trapezoid thread
螺距pitch of thread
粗牙螺紋coarse thread
細牙螺紋 fine thread
特細牙螺紋extra fine thread
通長螺紋full thread
惠氏螺紋whitworth thread
公制螺紋 metric ibread
美國標準錐管螺紋 American standard taper pipe thread (NPT)
螺孔 tap
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