... 左旋螺纹丝锥：left-hand thread tap 左旋螺母：left-handed nut 左旋螺杆;左旋螺钉;左旋螺旋桨：left-handed screw ...
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left handed nut 反螺纹螺帽
left-handed screw nut 左螺帽
This indicates that the nut has left handed threads.
这说明螺母带有左手螺纹。
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This indicates the locking nut has left-handed threads.
这说明锁定螺母带有左手螺纹。
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