通过试验和理论分析厚、扁螺母在紧固过程中的受力情况，并从试验结果得到一个较合理的厚螺母拧紧力矩，既能保证塔式起重机的安全运行，又能延长螺栓的使用寿命。
Changing the positions of thin and thick nuts and using the right thick nut tightening torque ensure safe operation of the crane and longer lives of the screws.
蝶形螺母、花色螺帽：特厚、特扁、公制、英制、德制、螺母、螺栓。
Nut series: extremely thick, extremely flat, Metric, BS, DIN, nuts, bolts.
专业生产蝶形螺母、花色螺帽：特厚、特扁、公制、英制、德制、螺母、螺栓。
We specialize in producing nut series: extremely thick, extremely flat, Metric, BS, DIN, nuts, bolts.
专业生产蝶形螺母、花色螺帽：特厚、特扁、公制、英制、德制、螺母、螺栓。
We specialize in producing nut series: extremely thick, extremely flat, Metric, BS, DIN, nuts, bolts.
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