left hand thread 左旋螺纹 ; 反扣 ; 左螺纹 ; 左罗纹
left-hand thread tap 左旋螺纹丝锥
left-hand thread manual tap 左旋螺纹手控丝锥
left-hand-thread rod 左丝扣钻杆
left hand-thread 左旋螺纹
LTH Left Hand Thread 左旋螺纹
die for left hand thread 左螺纹板牙
wide sawtooth left-hand thread 宽锯齿左旋螺纹
The general taps are right-hand thread. Please specify if some left-hand thread taps are needed.
丝锥通常生产右扣螺纹， 如需左扣螺纹应在订货时说明。
To overcome the shortcomings of the shear pin type joint and left-hand thread type joint, a sliding sleeve subsurface safety joint is developed.
为了克服剪钉式和反扣式两种安全接头的不足，研制出一种滑套式井下安全接头。
The utility model relates to a medical orthopaedics left-hand drill bit for drilling a left-hand thread hole. A metal drill rod is carved with a left-hand groove.
本实用新型涉及一种可以钻左旋丝孔的骨科医用左旋钻头，它是在一个金 属钻杆上镂刻有左旋凹槽。
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