The bolts at bent links of safety chain should be secured by doublenuts.
使用在弯曲连接器的安全螺栓必须用双螺帽固定住。
2
Germany doublenuts automatic ball screw with imported linear guide rail.
配德国产双螺母自动消隙滚珠丝杆，进口直线导轨。
3
The test demonstrates that the arrangement of doublenuts with an elastic element is very successful in providing a reliable connection for ceramics and metal.