High strength coupling Long Nut 1.Material:carton steel 2.Grade :4.8~8.8 3.Finished:black,zinc ... coupling Long Nut 1 Size of nuts : M3-M362 Material : carbon steel, alloy steel3 Standard : DIN,GB,JIS,BSW4 Surface:accroding to ... nuts, slotted nuts, rivet nut, DIN 6334 Long Nut WASHERS: flat washers, spring washers, lock washersSCREWS: machine screws, self tapping screws, set screws ...