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空军工程设计研究局高级工程师王天应等同志研制成功用于连接网架节点球和杆件的双向螺纹螺拴,这项成果已通过专家鉴定。双向螺纹螺栓的前段小径螺栓为后旋螺纹,与我国目前各类网架节点杆件的紧固件的螺纹旋转方向一致,也与螺检球上螺栓孔内螺纹相吻合。其后段的大径螺栓螺纹为左旋,与两个厚度不同的六角
Wang Tianying, a senior engineer of the Air Force Engineering Design and Research Bureau, has developed a two-way threaded snail that has been successfully used to connect ball and bar elements of a mesh frame. This result has been identified by experts. The front-end small-diameter bolt of the bidirectional thread bolt is a back-screw thread, which is consistent with the thread rotation direction of fasteners in China’s current various types of mesh frame node rods, and also coincides with the internal thread of the bolt holes on the thread inspection ball. The large-diameter bolt thread in the following section is left-handed, with two different thickness hexagons