Air line quick-release fittings thread sizes.

[Devil's Advocate]

Hello.

I have a new compressor, a cheapo 'Challenge Extreme' (***cough***) air tool set for its basic facilities, a half-decent SIP Sapphire spray gun and, finally, a cheapo Chinese 'touch-up' gun.

I need to join them together...

Since most of the parts (ie: the Challenge Ext. kit which includes the air hose) use 'Hi Flow Uni' connectors, that's the way I'd like to go for everything - easy enough so far.

The SIP has a 1/4" BSP female thread and the compressor a similar male, so getting 1/4" BSP 'H-F-U' fittings to fit these is no problem either. Still all good...

The Chinese touch-up gun has a different thread, however. It has a noticeably finer thread pitch to the 1/4" BSP fittings, and is also a smaller diameter - measured male thread tip-to-tip is nigh on 10mm diameter. Any idea what thread type this could be?

Strangely, if I remove one of the H-F-U male connectors from a Challenge-Ext tool, I find that the threaded part of the fitting has the SAME pitch as the Chinese gun, but is slightly larger diameter at ~11mm. I guess the 'Challenge' kit will also be of Chinese manufacture so has a similar thread pitch to the touch-up gun tho' the slightly larger diameter - by 1mm.

(For reference, the 1/4" BSP make thread is coarser and around 12mm diameter.)

Any ideas what thread size I have on my Chinese gun? To recap, it has a finer thread pitch than 1/4" BSP and is around 10mm diameter.

(And, any idea where I can either get a H-F-U connector with this thread, or else a 1/4"BSP to 'Chinese' adaptor?!

Thanks!

 

[rtbcomp]

Look Here you might find something under "Technical."

 

[tigler]

More than likely M10 x 1 pitch, or, a very remote possibility it could be 1/4 gas thread.

 

[Devil's Advocate]

Good stuff, gents - that link has loooots of useful info!

I'd since discovered that 1/8" BSP does have a finer thread than 1/4" BSP, and since 1/8" BSP is just under 10mm diameter, it remains a possibility. So, likely it is that or, as tigler says, a 10mm metric thread.

I think I have a 10mm bolt in the garage, so that'll be my first port of call tomorrow. Either that or a visit to my neighb who has tons of weird equipment, likely including thread gauges and a vernier. Whether he'll be able to find them is a different matter...

Cheers - really useful

 

[Sean]

You can check the 10X1 tread pitch by taking a flywheel bolt out and trying that!

So the ranks of the 602 bretherin increases!

Evening DA

 

[Devil's Advocate]

Sean, you must be thinking of that Devil's Advocate twit on the 2CV friends forum - y'know, the guy that talks and talks and talks and doesn't know when to stop...


**cough** er, thanks...


My neighb has an engineer friend who diagnosed it as being 1/8" NPT (tapered) - so I'm now looking for a 1/8" NPT male to 1/4" BSP Female adaptor...

 

[Devil's Advocate]

Well, it's reckoned to be a 1/8" NPT thread.

Just about the only thing I cannot get an adaptor to 1/4" BSP for.

Are simple things meant to be this bludy awkward?

 

[simon718]

number 7 on this page mate: 7) ADAPTOR 1/8 NPT (F) TO 1/4 BSP (M).

 

[Devil's Advocate]

Thanks, Simon. Unfortunately, I need them t'other way around! (1/8" NPT MALE to 1/4" BSP FEMALE...)

I think I've tracked one down on eBay - but that's now out of bounds as you recommend 'stay off' from there...

 

[simon718]

ill see if i can find any the other way round in a minute

need to change that actually - thats from a time where i was spending far, far too much money on there!

 

[madkayaker]

hi simon welcome back!

 

[graffian]

Could you buy an 1/8 NPT connector to suite you quick release. I looked on google, the
pic is very small but it looks like it may be a CEJN 310 style.

 

[Sean]

RT cold you not just tap out the spray gun to take 1/4"? taps should be cheap and easy to find, spray gun will only be cheap soft ally.

S