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该螺栓(发明专利4875541)可简化大型固定件的结构(见图),降低金属用量和金属切削消耗量。螺栓杆部4的一端5车出螺纹和作出倒角6,而螺栓的另一端为圆柱头3。在圆柱头的
The bolt (patent 4875541) simplifies the construction of large fasteners (see photo), reducing metal consumption and metal cutting consumption. One end 5 of the bolt shank 4 is threaded and chamfered 6 while the other end of the bolt is a cylinder head 3. On the head of a cylinder