高强螺栓直径M(mm)12162022242730等级8.810.98.810.98.810.98.810.98.810.98.810.98.810.9高强螺栓孔单个紧固件直径D(mm)厚度(mm)13.517.522242630332020202020202020202020202020选用螺栓长度(mm)初拧值终拧值（取5的倍数）(N·M)(N·M)656570707575808085859090959535.146.878114.4156221214.5300.3265.2390394.88561.6536.25760.570.293.6156228.8312442429600.6530.4780789.751123.21072.51521
