Faucet washers come in a variety of sizes from a variety of vendors, and have done so for many years. These sizes are expressed in different ways as well. I have tried to collect information on how this all works and document it. Note that this table contains some inconsistencies - different vendors give different information, and I've included all of it - this is why 1/4M is listed twice, at two different sizes, for instance. The fractional sizes have suffixes, S for "small", M for "medium", and L for "large". R appears to mean "regular", and is the same as having no suffix, which is why I have R in parenthesis below.
| number size | fractional size | dimension in inches | /32" | /64" | Brasscraft | Korky |
|---|---|---|---|---|---|---|
| 000L | 29/64 | mauve | ||||
| 000 | 15/32 | 30/64 | lt brown | |||
| 00 | 1/4S | 1/2 | 16/32 | 32/64 | grey | |
| 0 | 1/4M | 17/32 | 34/64 | red | dk blue | |
| 1/4(R) | 9/16 | 18/32 | 36/64 | green | dk green | |
| 1/4M | 37/64 | tan | ||||
| 1/4L | 19/32 | 38/64 | blue | dk purple | ||
| 3/8(R) | 5/8 | 20/32 | 40/64 | orange | grey | |
| 3/8M | 21/32 | 42/64 | pink | violet | ||
| 3/8L | 1/16 | 22/32 | 44/64 | purple | orchid | |
| 1/2(R) | 3/4 | 24/32 | 48/64 | yellow | hot pink | |
| 1/2L | 25/32 | 50/64 | aqua/lt green | teal | ||
| 5/8(R) | 3/16 | 26/32 | 52/64 | brown | yellow | |
| 5/8L | 29/32 | 58/64 | lilac | |||
| 5/8L | 5/16 | 30/32 | 60/64 | lt blue | ||
| 1 | 32/32 | 64/64 | tangerine | |||
| 1-1/8 | 9/8 | 36/32 | 72/64 | lt blue |