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1·The design of a new pre-tensional structure (FROMOpreload nut) applied in the large size of screw thread was introduced, the pre-load bolt is only beared with the pure tensile stress.

介绍了一种应用于大规格螺纹预紧的新型结构FROMO预紧螺母的结构设计，该结构螺栓只承受纯拉应力。