嵌装圆螺母
GB882销轴
GB881螺尾锥销
GB880带孔销
GB879弹性园柱销
GB878螺纹园柱销
GB876空铜铆钉
GB923盖形螺母
GB834滚花高头螺钉
GB12半园头
GB31.1-88六角头螺杆带孔螺栓
GB32.1-88六角头头部带孔螺栓