rebar coupler with threading rolling end Material: 45C or 40Cr Size: 14-40mm Thread ... Pitch:2.5mm,3.0mm,3.5mm rebar coupler with threading rolling end Materials: 45# carbon steel. Specifications: D14mm-40mm. ... to enlarge the end of rebar.Secong, use GZL-45 Threading machine to process screw on the enlarged end.Third, use ... coupler to connect two rebar ends. rebar coupler with threading rolling end