M20 (20mm) Flat Washer (Form A) - Steel (Pack of 10)

Product Information

Depending on the tap type and the specifics of its assembly, you may need large tap washers, mudguard washers, small tap washers, or even mini versions. Commonly used washer sizes for various indoor or outdoor taps include: They achieve their purpose by creating an impenetrable physical barrier between the tap seat and the spout. The material construction of most tap washers also means that they’re able to fill and even out any irregularly-shaped voids between different parts of a tap fitting (generally the valve and the tap seat), effectively sealing off the tap spout from the valve.

As with all of our fasteners, please note that it is the responsibility of the user to assess the suitability of the product in question. FORM A & B WASHERS What type of tap washer should I buy? The one aspect that tends to cause more confusion and uncertainty than any other regarding this question is often getting the correct sizing. They also work differently to the other more traditional sealing washer types outlined above. In a tap that uses ceramic tap washers, a pair of close-fitting slotted ceramic discs replace the more standard nylon, rubber or fibre washer. One of the two ceramic discs is fixed in place, while the other can rotate through 90 degrees (hence quarter-turn). When a tap head is turned on or off, a rotating screw forces the tap washer to move up or down (respectively) within the body of the tap assembly. This lifts it away from the seat and opens up the flow valve. In doing so, it allows pressurised mains water held in the plumbing system to pass through the tap spout at varying volumes and speeds. Key to this function is the fact that tap washers are typically made from materials that can be squeezed or compressed to form a watertight seal (although exceptions do exist for certain tap types). This enables them to seal off the valve opening more effectively, even in cases where general usage-related wear and tear has caused small surface irregularities over time. Often called penny washers or mudguard washers, repair washers have an overall outside diameter that is larger than standard flat washers.

Order Approval

The following table shows the exact dimensions of all our Form A & BWashers (don’t forget to make an allowance for the 1mm +/- tolerance in diameter as stated above).

Rubber washers and gaskets are displaced and distorted more aggressively than some other materials under high compression forces. This can lead to increased signs of wear after extended use.Form C washers have a slightly large overall diameter than Form A & B washers, as you can see by comparing the same sized washer in the table below. This means that they are particularly suitable for use with materials that are softer than hard metal (such as wood and plastic), as they give a wider spread of load and reduce the potential for damage.