A washer is 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 a threaded fastener, such as a bolt or nut. Other uses are as a spacer, spring (Belleville washer, wave washer), wear pad, preload indicating device, locking device, and to reduce vibration (rubber washer).
Washers are usually metal or plastic. High-quality bolted joints require hardened steel washers to prevent the loss of pre-load due to brinelling after the torque is applied. Washers are also important for preventing galvanic corrosion, particularly by insulating steel screws from aluminium surfaces. They may also be used in rotating applications, as a bearing. A thrust washer is used when a rolling element bearing is not needed either from a cost-performance perspective or due to space restraints. Coatings can be used to reduce wear and friction, either by hardening the surface or by providing a solid lubricant (i.e. a self-lubricating surface).
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.Rubber or fiber gaskets used in taps (or faucets, or valves) as seal against water leaks are sometimes referred to colloquially as washers; but, while they may look similar, washers and gaskets are usually designed for different functions and made differently.

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  1. P

    Connector for tap with threaded tails. And should I seal the washer?

    Hi I'm going to be fitting a tap like this one: And just wanted to check that this is the correct part for connecting to 15mm copper pipe using compression: https://www.screwfix.com/p/flomasta-compression-straight-tap-connector-15mm-x-1-2-/58294 If not, please could someone let me know...
  2. B

    Do I need a washer for blanking plug in a copper hot water cylinder?

    Hi all I'm blanking a couple of openings in a hot water cylinder. The Screwfix Flomasta 1" BSP plugs fit perfectly but no washer supplied or listed. Given that the element has a washer and everything else is a compression fitting I'm concerned these should have one. The alternative is PTFE...
  3. S

    Sink gurgles when washer discharges

    Kitchen sink gurgles when washer in basement discharges
  4. T

    Hep20 tap connector washer

    Hello, I’ve used the hep20 tap connectors a few years back when I did. C&G plumbing course. I brought a few the other day and in the packet was a loose washer (not the tap flat washer). Can anyone tell me what it is used. I’m using copper pipe btw. Regards Tezzer
  5. L

    Cannot undo supatap washer

    Hi. Husband and I, both 85, have done our own plumbing all our 52 years married but are finding it harder now to get under sinks etc.!! Our current problem is a sixty year old supatap in kitchen sink. It has not needed attention for many years but is now dripping badly.We are unable to unscrew...
  6. L

    Need help with modifying stack for HE washer & Utility sink.

    Hi All, Could use some valued help redoing a stack to accommodate a washer and utility sink. The plan is to have the washer, then the dryer , then the utility sink all to the left of the stack. I believe the previous owner move the builder intended spot to make a bedroom, which I am...
  7. H

    URGENT Looking for Beta Cistern Washer for old 1930's Armitage Shanks Toilet.

    Hi, I need a Beta Cistern Washer for an old 1930's Armitage Shanks Toilet. Nobody has one. Can someone help. Or know anywhere that I might get it ? Any help much appreciated.. Hazel...
  8. T

    Tap washer not quite fitting

    Hi all, Sorry if it is a dumb question but .. I just fitted a 1/2inch tap washer to my basin tap and have 2 questions. 1. Is it normal for the washer to not quite fit the valve head, I had to take sandpaper to adjust it as I could not "squish" it in. Is there some kind of metric equivalent I...
  9. Crossfingers

    Trying to source 28mm washer

    Hi Im about to replace pump isolator valves on my grant boiler but the 28mm valves did not come with washers and I can seem to find them to buy. Can anyone please advise where I might be able to find them? Thanks
  10. AlisonGarner

    Washer and dryer under stairs

    I am buying a new house and I wondered if it was possible to put a washing machine and condenser dryer under the stairs
  11. B

    Trouble with dripping bathroom sink taps

    Hi I wanted to change the washers in the taps in my downstairs cloakroom. Have got as far as shown in the pic and assumed this is removed by loosening the 14mm nut. However this does not move at all. Any advice to get to the washer please. Thanks
  12. I

    How to join washer waste onto another existing horizontal waste

    Hello, I have a question that is essentially how best do I join a washer waste onto an existing horizontal waste? I have attached a drawing which hopefully shows better than I can explain!? The location is a garage where the washer and tumble dryer will be relocated to. The existing horizontal...
  13. B

    How to open this tap for washer change?

    This basin tap needs a washer change. How do I get in it?
  14. omendata

    Flush valve washer needed - nobody seems to supply this size

    Lecica Toilet is quite old (+15 years) I phoned the manufacturer but they sent me a standard washer for the Lecica Cistern flush Valve but it does not fit! Dimensions for the one i require are:- Inside diameter: 75mm. Outside diameter: 57mm.
  15. M

    Non-Standard Tap Washer Size

    I have gone to replace the washer in the shower taps as the shower is dripping but the washer seems to be a non-standard size. The 12mm was too long and so I went and bought a plastic one I could cut the end off but it is also slightly too wide, the 10mm doesn't fit either. It is a really old...
  16. K

    How or where can I buy a washer for an antique faucet stem?

    I have an antique sink and was able to remove the stem. It had a work out washer on the end of it. Is it possible to find these washers today? The ones I had were too small and this one also was not flat.
  17. J

    Tap washer to sink: above or below sink?

    I have purchased two Bristan Renaissance basin taps containing one black rubber washer each. The Bristan instructions say to put the rubber washer underneath the sink followed by the brass nut. I have always put the rubber washer underneath the tap and on top of the basin. Any suggestions of the...
  18. R

    Siamp diaphragm washer relacement- strange behaviour!

    Dear All, My cistern started making 'spraying' noises and became slow to fill when flushed. Looked at the diaphragm washer and noticed a split. Bought a new washer and replaced old one. With the new washer, the water flows just fine but the flow won't shut off. Put the old (split) washer back...
  19. Mouse 5656

    John Lewis ceramic mixer tap washer replacement

    Hi I have a John Lewis kitchen mixer tap but can’t see the item name just JL. Does anyone know what replacement ceramic washer I’d need? It’s approx 5-7 years old. Many thanks
  20. hobbes78

    Dish washer intake almost fits

    I just bought a dish washer but I'm having trouble connecting the standard 3/4" inlet hose that came with it. As can be seen in this video: https://photos.app.goo.gl/JqUcXuj5MT1KvKrZ9 It almost fits the installed faucet. The gap seems to be less than 1mm. The house was built in 1986, so I...
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