bolt with countersunk collar的意思|示意

美 / / 英 / /

沉领螺栓

有锥缘的螺栓 ... 未旋紧的螺栓 devil bolt 有锥缘的螺栓 bolt with countersunk collar; with countersunk collar bolt 螺栓垫圈 facing ring; ping-pong half ...