标准查询 标准查询普通螺纹内、外螺纹余留长度，钻孔余留深度，螺栓突出螺母的末端长度
Regular screw threads - Remaining length of inner and outer thread, remaining length for drilling, end length of convex nut of bolt
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标准查询Regular screw threads - Remaining length of inner and outer thread, remaining length for drilling, end length of convex nut of bolt
