GB 31.1-88(代替@@ GB31、23、24-76 | UDC 621.882.6 )
Hexagon bolts with slit in hole on shank-roduct grade A and B
六角头螺杆带孔螺栓@@
betway88必威
GB 31.1-88(代替@@ GB31、23、24-76 | UDC 621.882.6 )
Hexagon bolts with slit in hole on shank-roduct grade A and B
六角头螺杆带孔螺栓@@