To make the connection surface tight, we must increase the bolt preload.
若要使连接面贴紧，就必须加大连续螺栓的预紧力。
2
There is defects on the surface and near surface of the bolt in canned motor pump because of manufacturing technique.
由于屏蔽电动机螺栓的制造工艺所决定，在其表面及近表面易存在缺陷。
3
The surface treatment technology is introduced for the high strength, bolt mechanical zinc coating. Specific instructions are provided for general trouble-shooting in the operation.