High strength coupling Long Nut 1.Material:carton steel 2 ... 3.Finished:black,zinc 4.Certifica:ISO9001:2008 SepecificationHigh strength coupling Long Nut 1 Size of nuts : M3 ... nuts, heavy hex nuts, hex flange nuts, nylon insert lock nuts, cap nuts, slotted nuts, rivet nut, DIN ... 6334 Long Nut WASHERS: flat washers, spring washers, lock washersSCREWS: machine screws, self tapping screws, set screws, ...