What is a glass washer?


A cup washer is a lightweight domed fastener used as a decorative, insulating or support element for screws and nuts. This type of washer can be used as a surface mount or countersunk element. All cup washer types feature a bowl-shaped central depression that allows for placement of the screw without protrusions or screw head. A tumble dryer is usually made of mild steel, brass, leather or plastic and is available in a wide variety of sizes and designs.

A cup washer is generally used to provide support, insulation, or a cosmetic finish to screws or bolts, especially those with countersunk heads. Cup washers are made from a variety of materials depending on the intended application. This includes light metals like steel or brass, insulating materials like plastic and, in the case of tap and pump washers, leather. Cup washers are designed to be surface mounted or countersunk. They often include features such as decorative snap-on covers and electrical terminal cutouts.

The surface mount cup washer designs resemble a dog water bowl with raised sides and a domed center. This type of cup washer is well suited for applications that do not allow screws to be countersunk. The washer then provides a good bearing surface for the bolt and, as the head of the bolt sits inside the washer, a flat, ridge-free finish. Surface mount washers are usually made of brass or steel and often feature a decorative cap that surrounds the screw head.

Flush mounted cup washers are countersunk into the work surface and feature internal contours suitable for countersunk or flat head screws. This type of cup washer usually has a lip or flange built into its outer edge to provide better support for the bolt. These washers can be made from a variety of materials, including nylon, although steel and brass are the most common. The flush mount cup washer is commonly used in wooden constructions and offers a good bearing surface and no-bulge finish. This type of washing machine is also often supplied with a snap-on lid.

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Insulating cup washers are used to electrically insulate metal screws and screw heads. They are often used to insulate screws used as insulators on printed circuit boards and screws that hold electrical components in place. These washers typically have a flat bottom and fairly high side walls to provide maximum protection against electrical shorts. Other cup washer designs in electrical and electronic applications are end cups. These washers feature a cutout in the side wall that allows for terminating lugs with guides.

Although leather cup washers are rarely used, they are often found as seals in a variety of applications. This includes faucet washers, booster pump seals on kerosene lamps, and small hand pumps or seals on piston-actuated air rifles. This type of washer is particularly effective as a seal in environments exposed to oily fluids. These washers are generally available as a flat disc which is attached to the operating element of the apparatus and cup formed in place.

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