A washer is a thin, flat disc with a hole in the center. Depending on the construction material, washers can be used to distribute the load of a threaded fastener (like a screw or a nut), reduce vibration, prevent galvanic corrosion, or act as a spacer, spring, wear pad, locking device, or seal.
There are generally three types of washers: plain washers, spring washers, and locking washers.
Plain washers disseminate the weight of a load to prevent a surface from being damaged or to provide electrical insulation.
Spring washers are flexible enough to prevent a fastening from loosening due to intense vibration.
A locking washer can also be a spring washer; locking washers prevent materials (like a nut/bolt) from unfastening and coming loose.
What are the benefits of Urethane Washers?
As a material, urethane has physical properties that make it a popular choice for conditions that rubber simply cannot withstand. For instance, urethane offers more abrasion resistance than its rubber counterpart, can be manufactured in a broad spectrum of colors and sizes, is non-marking, and will return to its original shape (without taking a set, like rubber).
In general, urethane offers many advantages over metal washers. Urethane washers will not gall or scratch mating parts. Unlike both metal and rubber washers, urethane washers will not become brittle over a long duration of time under normal circumstances. They are also non-conductive and far surpass general grades of rubber washers with regards to ozone, shock absorption, and tear resistance and in general, they tend to cost far less than their metal counterparts.
Applications for Urethane Washers
Urethane washers are optimum vibration dampeners and can remain flexible at low temperatures. They perform well when utilized in abrasive resistant situations and are highly resistant to water, weather, hydrocarbon, mineral oils, and most chemical substances. Urethane washers also have tight sealing capabilities and since urethane is an elastomer, they can conform to nearly any shape.It is suitable for all kinds of nstruments such as fitness equipment