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Does anybody know how to measure the thread size of a moderator. I sold the rifle a little while ago and I can't seem to find out what size thread it is.

Rifle was a Weatherby varmint 22-250 and the mod is a Roedale ultra if that helps at all, I am sure it won't.

Cheers

Do you have analog or digital calipers?
Or a maplin near by?

I have got a digital set.

Measure the diameter of the threads initially, this will usually give you the standard size. To be sure count the threads over a given distance, 1/4" for example, then multiply to get threads per inch.

Okay will give it a try, when you say diameter I assume you mean the distance spanning the hole from one side to the other?

That's it mate, it should be close to one of the standard sizes

Measure the hole and then use a "Thread Gauge", that's what they are for. Then use your Zeus chart.

Hey Demonic, I measured it and it appears to be 17.62 and it is either 6 or 7 threads per 1/4 inch , I think 7?

Sorry this isn't my kind of thing.

It could be an 11/16 or, at a push, 3/4. Sounds like 24-28 TPI
As it's a Roedale Delta it's likely it's 5/8x24 UNEF.
Can you measure with the other side of the calipers in the hole?

Yep other side of the calipers it measures 17.3