High strength coupling Long Nut 1.Material:carton steel 2.Grade :4. ... .Certifica:ISO9001:2008 SepecificationHigh strength coupling Long Nut 1 Size of nuts : M3-M362 Material : carbon steel, alloy steel3 Standard : DIN,GB ... : hex bolts, heavy hex bolts, hex flange bolts, carrage bolts, wheel bolts, stud boltsNUTS: hex nuts, heavy hex nuts, hex flange ...