Complete Specification M16-M40,customized can be M12-M50 Special Craft CNPOW Weldable Coupler use annealed raw material and has high quality, good toughness. It also has pass the tensile test and it will not appear the phenomenon of twisting and breaking in the use process, which guarantees the high requirements and high standards of engineering construction. High Quality Steel CNPOW Weldable Coupler use high quality alloy steel such as 20Cr;Great advantage of reasonable design, advanced technology, high precision, reliable connection quality, good comprehensive mechanical properties, good low temperature performance, good plasticity and weldability make CNPOW Weldable Coupler widely applied in medium and low pressure vessels, oil tanks, vehicles, cranes, mining machinery, power stations, bridges as structures subjected to dynamic loads, mechanical parts, building structures, general metal structures. Besides,it can be applied under hot rolling or normalizing as well as the various structures in cold areas below - 40 .