Plastic pipe thread id.....

[jo2020]

Having checked my tables I'm having some trouble identifying a thread. It's on a connecting pipe inside an airline regulator in the UK. It's a male thread on a plastic pipe that screws into the metal regulator body. Tpi is 18. OD is 0.835 inches. Fo you agree this this is 1/2 NPT? - it doesn't look tapered but it's only a short 1/2 fitting so hard to be sure. TIA!

 

[rpm]

If we spin this, look up the regulator where you may find the answer.

 

[jo2020]

If we spin this, look up the regulator where you may find the answer.

Well I'm thinking now it might be metric - the tops of the threads maybe flattened off which keeps the OD less than 22mm. I didn't have a metric thread garage when I looked at it so will double. check.....

 

[rpm]

Well by looking at regulators online it should be either 1/4" or 1/2" BSP. Again I suggest that you look yours up. Can`t see it being metric.