1级塔机专用螺栓 10.9级高强度加大加长螺栓 0.9级塔吊螺栓、10.916*100-500 18*100-500 20*100-500 22*100-500 24*100-500 27*100-500 30*100-500 33*100-500 36*100-500 39*100-500 42*100-500 48*100-500