Awasheris a thin plate (typically disk-shaped, but sometimes square) with a hole (typically in the middle) that is normally used to distribute the load of athreaded fastener, such as aboltornut. Other uses are as a spacer, spring (Belleville washer, wave washer), wear pad,preloadindicating device, locking device, and to reduce vibration (rubber washer). Washers often have an outerdiameter(OD) about twice their inner diameter (ID), but this can vary quite widely.
Washers are usuallymetalorplastic. High-qualitybolted jointsrequire hardened steel washers to prevent the loss of pre-load due toBrinellingafter thetorqueis applied.
Rubberorfibergasketsused intaps(or faucets, or valves) to seal against water leaks are sometimes referred to colloquially aswashers; but, while they may look similar, washers and gaskets are usually designed for different functions and made differently.
Washers are also important for preventinggalvanic corrosion, particularly by insulating steel screws from aluminium surfaces.
The origin of the word is unknown; the first recorded use of the word was in 1346, however, the first time its definition was recorded was in 1611.
Washers may also be used in rotating applications, as a bearing. Athrust washeris used when arolling element bearingis not needed either from a cost-performance perspective or due to space restraints.Coatingscan be used in attempt to reduce wear and friction either by hardening their surface, or providing a solid lubricant (i.e. a self-lubricating surface).
|Minimum Order Quantity||100 Piece|
|Packing Type||Box, Carton|
|Dimension/Size||1/8" to 2"|
|Quantity Per Pack||100|
Outer Diameter: 3mm to 12mm
Surface Finish: Metal Coated,Electroplated