The main purpose of a flat washer is to spread the force that is created by the tightening of a nut across a wider surface area.
Flat washers are also occasionally used as spacers, they are useful for this purpose if the bolt being used is slightly too long for the application in question.
Our flat washers are available in metric (form A, B &C) and imperial. Metric Form A and C are the same thickness but Form C has a larger diameter. Metric Form B washers have the same diameter as Form A but they are thinner.
Imperial sized flat washers are classified in tables – a more detailed explanation is available on the imperial washers page.
If you need a washer with a larger diameter than our standard flat washer choose a repair washer.