I'm looking for a brass connector like the one below, where the outer diameter of the wired thread is 5/8" aka 15.8mm aka 5 Hun, and the outer diameter on the other end fits a tube with an inner diameter of approx 14mm

So they have all possible sizes, 1/8 - 3/8 - 1/4 - 3/4 - 1/2 but no 5/8

They have 1-2-3-4 and 6 Hun, but mysteriously no 5 Hun anywhere to be found

I gave up searching in mm, as that is a complete no-go.

Next, what you find the sizes don't make any sense.

Or maybe someone can explain to me how something with an outer diameter of 1/2" can have an inner diameter of 14.2mm

What the hell is wrong with this country. Well I now understand why everything they build is bend and out of shape.

Edited May 25May 25 by CallumWK

2 hours ago, CallumWK said:

Or maybe someone can explain to me how something with an outer diameter of 1/2" can have an inner diameter of 14.2mm

Because the outer diameter of 1/2 BSP parallel is 20.95mm. To understand the confusion it would be best read up on the thread history that goes back many years. The internal diameter 14.2mm is close to the 1/2 original definition.

Thailand is a mishmash of pipe threads so it always pays to have the item in hand along with measuring callipers when purchasing fittings.

It's not rocket science to understand the the 1/2 designation refers to 1/2 pipe thread thread.

Do common pipe threads not typically jump from 1/2" to 3/4"?

Maybe try a hydraulic shop.

3 hours ago, Artisi said:

It's not rocket science to understand the the 1/2 designation refers to 1/2 pipe thread thread.

To me it is, as I expected it to be 1/2 inch.

So thanks for confirming that to the inch-mm-hun sizes now have to add bsp as well.

So what I'm looking for is a 15.88mm M16 thread, also called 5/8inch or 5 hun, wiith the other end fitting a 14mm inner diameter rubber hose

Edited May 26May 26 by CallumWK

What it is to you, matters not. Generally, pipe is designated by the nominal ID, while tubing is designated by the nominal OD

Pipe wall thickness varies, but the OD has to remain contestant such that the same fittings and threads can be used on all wall thicknesses.

1/2" pipe has an OD of ~21.3mm

Schedule 40 has an ID of ~15.8mm

Schedule 80 has an ID of ~13.7mm

Schedule 160 has an ID of ~11.7mm

All use the same 1/2" pipe thread.

M16 is not a pipe thread, pipe threads are tapered.

I think what you want is a hose-barb with a 3/8" pipe thread and a barb ~2mm larger than the ID of your hose.

If this is what you want then it is 1/4 BSP/NPT as shown. About 13mm. (13.157)

Whether you need straight or tapered I cannot tell from the information presented.

Good God, for a moment I thought your post was about cock size!