... HB280-320. 5. 3 times static overload testing6. Rigorous QC on the details like painting, flatness, tolerance, parallelism, packing, cleanness. ... .5,Producting standard:ISO 23286,Inspecting standard: ISO2330/20027,Stamping on one side of shank,including: Loading capacity: kg×LC(mm) Manufacturing ... , China. And we are near Laigang Group, which is one of the ten biggest steel company in China. As a ...