When you are using screws, bolts, and washers, you need nut too. We even keep nut of all steel grades, other materials in all sizes and grades. You can tighten the joining of machineries using them and enhance the safety of joining when the surface of screws is not big. Those are mostly female threaded that fit on the male threads of the connecting screws or bolts. You can use them from connecting structural components and give them rigidity. Use them for engines, machineries, walls or fences and other surfaces.