High strength coupling Long Nut 1.Material:carton steel 2.Grade :4. ... .8 3.Finished:black,zinc 4.Certifica:ISO9001:2008 SepecificationHigh strength coupling Long Nut 1 Size of nuts : M3-M362 Material ... flange nuts, nylon insert lock nuts, cap nuts, slotted nuts, rivet nut, DIN 6334 Long Nut WASHERS: flat washers, spring washers ...