Three combination screws are mostly used for the connection between thin metal plates and play a connecting role.When connecting, first make the threaded bottom hole of the connected piece,and then screw the combination screw into the threaded bott...
A.self-tapping screws can be used for fixing the wall board, self-tapping can be screwed into the wall board and drilling.B. self-tapping screws are to be constructed by special power tools, drilling, tapping, fixing, locking self-tapping screws ti...
The method of using the metering lead seal is to use the sealing wire to thread the wiring cover and fixing screws of the meter, and then thread the two ends of the sealing wire into the special hole of the plug body, tie the knot firmly,bend and ...
