螺钉头不应暴露在外。
提供防盗螺钉，螺钉头的嵌入材料和防盗螺钉座。
Anti-theft screw, screwhead inserting material and anti-theft screw seat are provided.
完成后在胀套外露表面及螺钉头部涂上防锈油脂。
Expose surface and screw head should be wiped antirust oil in the distend cover after finishing.
第三项是在改锥杆部设置能夹持螺钉头的弹性夹持装置。
The third technical measure is that the rod part of the screw driver is provided with an elastic holding apparatus.
防盗螺钉，螺钉头的嵌入材料，防盗螺钉座和防盗螺钉组件。
Anti-theft screw, screwhead inserting material, anti-theft screw seat and anti-theft screw assembly.
高速配气机构设计中一个不可忽视的薄弱环节是气门间隙调整螺钉头部的挤压疲劳。
The squeezing stress between the valve end the screw for adjusting valve clearance must be taken into account in designing high speed valve train.
所述连接螺钉采用骨螺钉，螺钉头为外六角。所述螺母采用膨胀六角螺母或六角螺母。
The connecting screw adopts a bone screw, and the head of the screw is outer-hexagonal, and the nut adopts an expanding hexagon nut or a hexagon nut.
本实用新型制造和使用方便可靠，在使用时螺钉头的内腔和扳手的头部不易因磨损而失效。
The utility model is convenient and reliable in manufacture and use, the intracavity of the screw and the head of the wrench is not easy to fail by abrasion when used.
区别于现有的电动、气动螺丝刀工具，该螺丝刀系统在驱动螺丝时，能对螺钉头实现无轴向压力的调节。
Different from traditional electric and pneumatic screwdriver tools, this screwdriver system can adjust the screw with no axial pressure when driving screws.
实验中不仅发现柔轮杯底扭裂这一事实，而且发现紧固件螺钉头部的尺寸及装配应力对柔轮杯底的扭裂均产生不可忽视的影响。
Torsional breekage, at the bottom of a flexible wheel has been found in the experiment , such breakage being strongly influenced by the dimension of fastening and assembly stresses .
实验中不仅发现柔轮杯底扭裂这一事实，而且发现紧固件螺钉头部的尺寸及装配应力对柔轮杯底的扭裂均产生不可忽视的影响。
Torsional breekage, at the bottom of a flexible wheel has been found in the experiment , such breakage being strongly influenced by the dimension of fastening and assembly stresses .
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