螺纹强度试验表明,当螺纹打孔深度到达60%以上时,深度的增加不会再增加螺纹接头的固定强度.一般说来,当螺纹孔深达到整个螺纹的55%时,螺栓就会在螺纹打磨前先断掉.
英语翻译Tests of thread strength show that any increase in threa
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