U bolt 1.Grade: from 4.8 to 12.9 ; 2.Finish: Plain, ZP,YZP,BZP, BO, H.D.G.,Dacromet and etc. 3.Material : carbon steel U bolt 1. Thread:M, UNC, UNF,2. Grade: 4.8 6.8 8.8 10.9 12.9, SAE J429 Gr2, 5, 83. Surface treatment: Zinc Clear, Zinc Yellow, Zinc Black, Tin-plating, Nickel-plating, Dacromet,Mechanical Galvanizing, Hot-dip Galvanizing, Dye Blackness, Copper Yellow, etc. 4. Packing: Carton, Box ...