Thread Gauge

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What size is 25G on whitworth thread gauge?

I have an old machine which has whitworth screws on so to find out which they were I got a whitworth thread gauge from my local D.I.Y. shop which has the following sizes:

62G, 60G 1/16", 48G 3/32", 40G 1/8", 36G, 32G 5/32", 30G,
28G, 26G, 25G, 24G 3/16 7/32", 22G, 20G 1/4", 19G,
18G 5/16", 16G 3/8", 14G 7/16", 13G, 12G, 11G 5/8",
10G 3/4", 9G 7/8", 8G 1", 7G 1-1/8 1-1/4", 6G 1-3/8 1-1/2",
5G 1-5/8 1-3/4", 4-1/2G 1-7/8 2" and 4G 2-1/4 2-1/2"

One of the screws is 25G and another is 22G but as far as i know you buy whitworth screws by what size they are in inches like 5/16, 3/8, 1/4, ect and not 25G and 22G. So what size is 25G and 22G in inches?

I asked the shop but they didn't know either.

Thanks

22G is equal to 9/32 ".

From there it goes "up" (roughly but closely enough 1/32" per G)

I like this question.

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