Pipe coupling according to the pipe end can be divided into: light pipe (pipe end without threads) and threading pipe (pipe end threaded).
Car wire tube is divided into: general threading pipe and threading pipe end upsetting.
Thick threading pipe can be divided into: EUE (with external thread), internal upset (with internal thread) and internal and external thickening (with external threads), etc. threading pipe.
If you press threading pipe thread type can be divided into: ordinary cylindrical or conical screw thread and other places of special threading pipe. In addition, according to user needs, threading pipe is generally equipped with fittings delivery.
