Once that is done THEN tighten the center bolt and follow by tightening the support knob.
中心螺栓和脚架支撑盘也已经一体化设计进去了。
With material mechanics theory, expounded bolt tail subjected to no center load action and roof bolt broken mechanism while roadway was supported with bolts.
应用材料力学理论，阐明了锚杆支护时锚尾一定受到偏心载荷作用和顶板锚杆破断的机理。
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；
应用推荐