The material of the splicing coupler is constructional quality steel of no.45 steel. Working principle: 1)slice up the end of the rebar; 2)peel the rib of the end of rebar with specialty rib peeling parallel thread rolling machine; 3)connect the two ends of rebar with rib peeling thread coupler; The characteristics of the usage: 1.Standard model: used in the occasion for connecting the steel bar in normal situation. 2.Different diameter model: used for connecting the steel bar in different diameters. 3.Flared model: used for the steel bar which was hard to match. 4.Positive and negative screw thread model: used in the occasion when the two sides both can not be turned but the lengths can be adjusted. 5.Locking nut model: used when the steel bar can not be turned, then it turns the splicing coupler to join the steel bar and then lock the splicing coupler with the locking nut.