These general use flat washers are positioned under the head of a bolt or nut in order to provide a smooth bearing surface and distribute the fastener load over a wider area.
Machine screws have a uniform diameter the entire length of the shaft as opposed to tapered screws which have a pointed tip. They are used to fasten machine components, appliances and more.
Rivet nuts are internally threaded fasteners inserted into brittle or thin materials that are not suitable for hole tapping. Rivet nuts mate with screws and bolts, and require access to only one side of the material for proper installation. These fasteners have aerospace, automotive, electronics, and marine applications and are often used in tubing.
Socket cap screws are commonly used in machine parts, die fixturing, and clamping. The socket head enables driving where there is not sufficient space for wrenches or sockets.