Grade 8.8 U Bolts
U bolts can be divided into two categories according to the material. The first is ordinary carbon structural steel, which is what we usually call carbon steel; the second is stainless steel. Carbon steel is divided into Q235, Q345 and alloy steel according to the carbon content and strength of the steel. Stainless steel is divided into 304, 321, 304L, 316, 316L, 317, 317L, 310S and so on.