Assorted washers: flat, split, star and insulated

A washer is a thin disk with a hole, usually in the middle. It is normally used to support the load of a threaded fastener. Other uses are as a spacer, spring (belleville, wave washers), wear pad, preload indicating device, and locking device. Rubber washers are also used in taps (valves) where they form the seal that shuts off the flow of liquid or gas. Usually washers have OD (outer diameter) about twice their ID (inside diameter). Download high resolution version (1053x912, 175 KB)Assorted washers with U.S. Nickel (coin) for size comparison. ... Download high resolution version (1053x912, 175 KB)Assorted washers with U.S. Nickel (coin) for size comparison. ... Screws come in a variety of shapes and sizes for different purposes. ... Latex being collected from a tapped rubber tree Rubber is an elastic hydrocarbon polymer which occurs as a milky colloidal suspension (known as latex) in the sap of several varieties of plants. ... Indoor Tap - commonly found in the bathroom/laundry and/or kitchen. ...

Washers are usually metal or plastic. High quality capscrews require hardened steel washers to prevent the loss of pre-load after the torque is applied (due to Brinelling). Rubber or fiber gaskets used in taps to stop the flow of water are sometimes referred to colloquially as washers; while they may look similar, however, washers and gaskets are usually made differently and designed for different functions. Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily forms positive ions (cations) and has metallic bonds. ... Household items made out of plastic. ... Torque applied via a crescent wrench Relationship between force, torque, and momentum vectors in a rotating system In physics, torque can informally be thought of as rotational force or angular force which causes a change in rotational motion. ... The Brinell scale characterises the indentation hardness of materials through the scale of penetration of an indenter, loaded on a material test-piece. ... Latex being collected from a tapped rubber tree Rubber is an elastic hydrocarbon polymer which occurs as a milky colloidal suspension (known as latex) in the sap of several varieties of plants. ... Fiber or fibre[1] is a class of materials that are continuous filaments or are in discrete elongated pieces, similar to lengths of thread. ... This article is about mechanical seals. ... Indoor Tap - commonly found in the bathroom/laundry and/or kitchen. ...

Washers are also important for preventing galvanic corrosion, particularly by insulating steel screws from aluminum surfaces. Corrosion is deterioration of intrinsic properties in a material due to reactions with its environment. ...

Types of washers

• flat
• fender washer
• flat, hardened
• lock
• split
• star
• belleville
• phenolic
• wave
• shoulder
• spring
• Tab
• Multi-tooth (star washers)
• Bimetal

SOME IMAGE TAGS ARE MESSED UP Belleville washer A Belleville washer, also known as a cupped spring washer, is a type of non-flat washer. ...

External links

• The Straight Dope on lock washers
• How to create a washer out of a penny at BoingBoing