machined surfaces are never perfect, edge-cut round nut gaskets can fill in the irregularities. Edge-cut round nut gaskets are typically made from materials like sheet paper, rubber, silicone rubber, metal, cork, felt, neoprene, nitrile rubber, glass fiber, or plastic polymers (such as polyethylene).C2F4Asbestos may be present in cutoff washers for specific applications.

Washers (washers) are thin plates (usually circular) with a hole (usually in the center) that are typically used to distribute the load of threaded fasteners. Other uses include as spacers, Belleville washers, wave washers, wear-resistant washers, preload devices, locking devices. Rubber washers are also used in faucets (valves) to cut off the flow of liquids or gases. Rubber or silicon Belleville washers or wave washers can also be used to reduce fan vibration. The outer diameter of the trimmed washer is usually about twice the size of the inner diameter.