15mm compression nuts, 24mm or 23mm ??

[diyjunky]

I was fed up using adjustable spanners for compression fittings so I decided to get some open spanners. I took a couple of different makes of 15mm nuts along with me to check.
I tested two plumbers spanners that were (the correct) 24mm in size. They were too big for my liking, probably about 1.5mm too much. I went to MachineMart and took the nuts along and a 23mm spanner fitted nicely with about 0.5mm slack for a fair fit around the nut.

Is this a problem with tolerances with the nut or the spanner or what ??

 

[MeldrewsMate]

Yes. You'll find some are 24mm, some, like those on flexible tap connectors are 23mm. It seems a little crazy to me too, but that's the way it is.

 

[cross thread]

Compression nuts vary slightly in size

 

[gas112]

yep some are 24mm some aren`t

 

[diyjunky]

OK, this makes sense in a odd kinda way

Maybe I need to get a 24mm spanner as well !