Raw materials: 45# hign-quality carbon steel structural steel Diameter: 14mm-40mm Thread pitch: 2.5/3.0 Standard thread angel: 75°/60° Use: Connect two pieces of rebar together, simple to operate. Our rebar couplers are suitable for steels of different countries. Apply to HRB335,HRB400,HRB500,RRB400 hot rolled rebar for reinforced concrete. Tensile strength could reach 600 Mpa. Performance: JGJ107-2010; ISO9001