Thread identification

[RickH]

(Previously would have gone to a usenet group for this via a Newsreader, but no longer know how to access them for free)

I need to identify a thread.

OD is 0.613" 15.57mm
pitch is 1.0 or 25TPI

It's possible that this is meant to be 5/8" as it's pretty close.
First thought as its on a water item, was 3/8 BSP .... but threads no match.
5/8" UNF was next thought - but TPI is out.

Anybody any thoughts on this ?

 

[foxhole]

You need a left hand boom threader.

 

[freddiemercurystwin]

Are you sure it's 25tpi?

My money is on it's 24tpi so it's a 5/8" x 24tpi UNEF.

You can buy a thread gauge pretty cheap, essential for taking the guesswork out IMO.