a heavy woodscrew with a square or hexagonal head that is driven in with a wrench 同义词：lag screw,
例句与用法
1.
Ordinary bolt connecting bolts as a permanent use , when the design requirements or questions about its quality should be carried out when the smallest lag bolts kind complex load testing and the results were consistent with national standard 《 mechanical fasteners , bolts , screws and stud 》 ( gb3098 ) 普通螺栓作为永久性连接螺栓使用时，当设计有要求或对其质量有疑义时，应进行螺栓实物最小拉力载荷复验，其结果符合国家标准《坚固件机械性能、螺栓、螺钉和螺柱》 （ gb3098 ）的规定。
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