Thead type used on a 32mm waste fitting

[gblades]

Does anyone know what the thread on the nut is that is used on a 32mm waste compression fitting?
The 32mm (or 1.25") is what used to be the inside diameter of the pipe going into the fitting (but pipes have become thinner walled so this is no longer true) so this has no relation to the thread on the compression nut.
I could measure the outside diameter and assume it is a BSP type thread but I wondered if anyone knew what it actually was. All I have managed to find is wiki saying the nut is 53mm

 

[just pumps]

Don`t think there is a standard, use the nut supplied with the fitting.

 

[Hugh Jaleak]

Seems an unusual question, not sure what you're trying to achieve. The thread type/size on a compression waste should be irrelevant normally, as Just Pumps has said, you would use the supplied nut, and trying to use one part of a compression waste fitting without the other would be very odd. If you are trying to connect to a threaded waste pipe, then that would be different size if not thread anyway, normally BSP.

 

[just pumps]

Might be best to add that sometimes using a nut from a different manufacture will fit it just doesn`t feel right when tightening up as in it feels a little sloopy on the thread and as my name is on the job I wont do it.

 

[dilalio]

And how often does one see the conical rubber washer fitted the wrong way round or the slip ring missing