Devon TRF Group Forum

RichT4 · Champion

I need some mechnical advice

gaschef · Devon's Best

Seems you have the ultimate example of the metric/imperial mismatch that we still have in engineering in the uk

1/2 - 13 is a Half inch outside diameter thread with a 13 threads per inch pitch

the 3.752 could be core diameter at the bottom of the threads or the effective thread diameter the height of the threads

3.752 is 0.1457" however looking in my data book I cannot find a thread listed that matches any of these

As it comes off a regulator it is probably a one off from the manufacturer to stop any non standard parts from being fitted

What make of regulator is it, as I have lots of old regs and may have a bit that might fit

RichT4 · Champion

Cheers for the info gaschef.

That number is 3.572 not 3.752 - does that help match any threads?

The reg is a US made instrument from Jordan (or Jordan Valve).

brownie · Expert

RichT4 wrote:

I need to buy an adjusting screw for a large regulator

The screw is a threaded bar type thing with a rounded end which applies pressure to a plate. The top of this bar has a machined hex on it so it can be turned with a spanner.

The part is SCREW ADJ 1/2-13 X 3.572 STL

Can anyone decipher this engineering speak and let me know what that actually is.

Much appreciated if you can.

cheers, Rich.

GOOGLE???????? biggrin

gaschef · Devon's Best

Never heard of a Jordan Reg stick a piccy on and I will see if it looks anything like any of the regs I use or have bits for

Torr · Expert

just being inquisitive... what sort of regulator

sounds like a US x Imperial thread... SAE??
can not find it in any of my books either
is it a very fine thread 26TPI like cycle?

just stuck jordan valve into google and got 10,0000 pages!

and there me thinkin US Divers?????

-- Edited by Torr on Monday 25th of October 2010 09:40:15 PM

RichT4 · Champion

looks something like this

-- Edited by RichT4 on Monday 25th of October 2010 10:37:11 PM

Wheely · Expert

1/2-13 X 3.572

Isn't this a typical american screw terminology?

1/2 screw thread diameter (in inches), -13 is thread pitch (in this case a fine thread or UNF) and 3.572 the length of screw shaft (in inches).

We have many similar identified screws here at work. Although the 3.572 does seem a bit absolute for a length!!?? Measure the length and see if it fits the bill.

Mark.

hampsterracing · Devon's Best

1/2" x 13 is normal UNC

quite freely available in this country.

RichT4 · Champion

It could be 13cm in length - can't be absolutely sure of the total length as it's missing some of it's length. The hex end got snapped off somehow. confuse

Oh well, looks like we'll have to get it from the manufacturer (and pay the extortionate sum disbelief

).

Cheers for having a look & a think guys. wink

hampsterracing · Devon's Best

just buy a 1/2" x 4" unc hex head or cap head and round the end off with a grinder ?

gaschef · Devon's Best

will have a rummage through my boxes of bits and see if I can see anything

I agree with Hamster it sounds like 1/2 UNC its just the 3.??????? thats a tad confusing