螺栓序号 螺栓等级 螺栓钢号 螺栓钢号 16 20 22 24 1 1 28.4 44.6 54.7 62.8 2 2 22.1 34.7 42.5 48.8 3 3 28.4 44.6 54.7 62.8 4 4 18.9 29.7 36.5 41.9 5 1 34.7 54.5 66.8 76.7 6 2 25.2 39.6 48.6 55.8 7 3 34.7 54.5 66.8 76.7 8 4 22.1 34.7 42.5 48.8 9 1 40.5 62.8 77 91.1 10 2 31.5 48.8 59.9 70.9 11 3 40.5 62.8 77 91.1 12 4 27 41.9 51.3 60.8 13 1 49.5 76.7 94.1 111.4 14 2 36 55.8 68.4 81 15 3 49.5 76.7 94.1 111.4 16 4 31.5