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Introduction Model number D12-D50 Raw material 45# high quality carbon steel or 40Cr Thread parallel thread Thread Pitch 2.5mm, 3.0mm, 3.5mm Thread angel 60/75 Certification ISO9001 Standard JG/T163-2013 Outer diameter 22mm-59mm Length 40mm-90mm Customizde remark available Type left-handed, right-handed, reduce, etc Application connecting steel rebars in construction Tensile Strength 100% bar break more than 600Mpa Technics cold extrusion or upset