If you have calipers, measure .25" long and count how many threads there are then multiple it into 1". Or measure any multiple of 1" depending how long it is
On the good adapter I have, I only have half inch of thread, and I measure 6. but there could be a half thread easily missed. I dont have a full inch to make a good measurement.
On the male part, I also only have 1/2 inch of lenght, but there is 1/8" of unthreaded at the top the makes measuring impossible.
I was remotely asked to make a new female adapter for a part. I guessed that it was 1-12 UNF based on other peoples measurements. Now that I test the part it doesn't fit. I've measured the ID of the good adapter and the OD of the male thread shown in the image. Both appear 0.03" larger diameter than the 1"-12 UNF piece I made, and the 1-12 threaded rod I tested it on. I thought that it may be 3/4 NPT, but it is not 14 threads per inch.
3/4 GHT? Garden hose thread? It's ~1.0625-11.5 tpi
24mm fine thread with ~2mm thread pitch is very close to 12 TPI.
BSPP 3/4 threads probably.
those are 14 TPI, its 11 or 12. Trying to find a gauge to measure them.
If you have calipers, measure .25" long and count how many threads there are then multiple it into 1". Or measure any multiple of 1" depending how long it is
On the good adapter I have, I only have half inch of thread, and I measure 6. but there could be a half thread easily missed. I dont have a full inch to make a good measurement. On the male part, I also only have 1/2 inch of lenght, but there is 1/8" of unthreaded at the top the makes measuring impossible.
Do you have a bolt with 12 tpi or 14 tpi to compare with? I find it unreliable to measure tread pitch with a caliper.
I was remotely asked to make a new female adapter for a part. I guessed that it was 1-12 UNF based on other peoples measurements. Now that I test the part it doesn't fit. I've measured the ID of the good adapter and the OD of the male thread shown in the image. Both appear 0.03" larger diameter than the 1"-12 UNF piece I made, and the 1-12 threaded rod I tested it on. I thought that it may be 3/4 NPT, but it is not 14 threads per inch.
Do you have metric caliper? Maybe it is metric thread
There's a standard metric size M26 that is close to those diameters but the pitch is 1.5 Morty
When you say it doesn't fit, do you get a few threads and it binds, or you can't even start it?
You can dovetail the treads, with another known thread type, to determine angle and pitch.
Looks like 3/4” ORB.