Cnpowparallel thread coupler are made of high-quality carbon steel and high-quality alloy steel, with reasonable design, advanced technology, high accuracy, reliable connection quality, and basic parameters of couplers of various specifications are all designed in accordance with the strength requirements of HRB500 grade rebars. They are applicable to HRB400, HRB500 and HRB630 grade rebars. The performance indicators have been tested by the "the National Center for Quality Supervision and test of building engineering" , and have meet the requirements of "" grade joints in JGJ107-2016. They are widely used in reinforced concrete structural engineering in various industrial and civil buildings. They are especially applied for rebar connections of buildings and structures with high explosion-proof and earthquake-proof requirements such as high-rise buildings, roads, bridges, subways, tunnels, power stations, and dams.