alarm bolt lift driver 起闹栓提升装置
Otherwise, you might feel as if you are using a socket wrench as a hammer hitting the handle of a screw driver to loosen a nut and bolt.
否则，您可能感觉到像用锤子一样使用一个套筒扳手来敲击螺丝刀手柄而拧开螺栓的螺母。
Every driver of the tower crane in the shift, to check the position of the screw bolt fastening connections, if loose, exceptions should be timely fastening.
每天塔机司机在交接班的时候，要检查各连接部位螺栓的紧固情况，如有出现松动等异常应该及时紧固。
The utility model provides a screw and a screw driver matching with it. The screw comprises a slotted screw head and a screwed screw bolt, and a positioning hole is arranged at the center of the slot.
本实用新型提供了一种配合使用的螺丝和螺丝刀，所述的螺丝包括开有一字槽的螺丝头和有螺纹的螺杆，在所述的一字槽中央有一定位孔；
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