8.8级加长特大高强度螺栓 20*50-500 22*50-500 24*50-500 27*80-500 30*80-500 33*80-500 36*100-500 39*100-500 42*100-500 45*120-500 48*120-500 52*100-500 56*120-500

8.8级，10.9级高强度螺栓，10.9s钢结构螺栓