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Homemade Airgun Reference

Faucet Washer Sizes
Faucet washers make good sealing faces for high pressure piston valves. They last much longer than most commonly available sealing faces and are cheap and easy to come by. Here is a chart to help you pick the right one for your application. Keep in mind the inner diameter is always .200".

Nominal Size

Diameter (fraction)

Diameter (decimal)

00

1/2

.500

0

17/32

.53125

1/4

9/16

.5625

1/4L

19/32

.59375

3/8

5/8

.625

3/8M

21/32

.65625

3/8L

11/16

.6875

1/2

3/4

.750

1/2L

25/32

.78125

5/8

13/16

.8125

5/8L

15/16

.9375