使用在弯曲连接器的安全螺栓必须用双螺帽固定住。
The bolts at bent links of safety chain should be secured by double nuts.
双端螺纹松质骨加压螺钉的特点是两端螺纹具有不同的螺距，无螺帽。
Compression cancellous bone screw with both ends thread is a Variable pitch screw designed tO provide rigid 'fixation of cancellous bone fracture.
从双头螺栓拆下固定铰链的螺帽。
从双头螺栓拆下固定铰链的螺帽。
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