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我单位生产的B&W、SUIZER船用低速柴油机中的贯穿螺栓、弹性螺栓均属高强度螺栓。对高强度螺栓螺纹的加工需在轧丝机上滚轧成形,因而螺纹的尺寸及几
My unit produces B & W, SUIZER marine low-speed diesel engine through bolts, elastic bolts are high strength bolts. The processing of high-strength bolt thread to be rolled on the rolling mill forming, and thus the thread size and a few