ned
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| posted on 6/2/06 at 09:25 PM |
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thread identification
I am hoping someone might be able to help me identify the thread on the fuel union in the pic.
Basically I need to source some with 8mm tails (I have one with 10mm and one with 6mm) but need to find out what thread they use first obviously. I
think they are quite an odd size, so suggestions for sourcing 8mm tail versions welcome!
Its from a fuel swirl pot as sold by tweeks, raldes, burtons etc etc
here.
The large bolt on teh right is m12, the small bolt above is 7/16unf which leads me to believe it might be 1/2unf, is this likely or a look/sound about
right?
Only thing is it looks to me to have a slight taper on the thread, but I'm not sure.
I've spoken to burtons who can't tell me what size the threads are and they don't sell any alternative unions apart from the jic
version of the pot.
Most unions of this size use 1/4 or 1/8npt as far as i can make out so this is a fair bit larger, maybe something commercial might fit as it has been
said that this filter/swirlpot is very similar to a lorry diesel/water seperator.
 
thread size?
cheers,
Ned.
[Edited on 6/2/06 by ned]
beware, I've got yellow skin
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flak monkey
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| posted on 6/2/06 at 09:32 PM |
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Its likely to be 1/4" NPT.
http://wolfstone.halloweenhost.com/TechBase/pipthr_ThreadedPipe.html
NPT thread sizes dont match up with the actual OD of the thread, confusing as that may be...they refer to the bore of the pipe that the thread is cut
on (or was originally designed to be cut on!) 
David
[Edited on 6/2/06 by flak monkey]
Sera
http://www.motosera.com
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trikerneil
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| posted on 6/2/06 at 10:23 PM |
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Could always be BSP
BSP
Nom size-------- TPI -------------Major dia
1/8 ----------------28 -------------0.383
1/4 ----------------19 -------------0.518
NPT
Nom size-------TPI-------- Major dia
1/8 ------------- 27 -------- 0.405
1/4 ------------18 ---------- 0.540
Hope that makes sense
ACE Cafe - Just say No.
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BKLOCO
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| posted on 6/2/06 at 10:50 PM |
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At a guess I'd say that looks like 3/8 BSPT If you measure the O/D with a micrometer and count the threads per inch I'll confirm that.
If yo buy one of These you can check it yourself.
[Edited on 6-2-06 by BKLOCO]
Experience is what you get when you don't get what you want!!! 
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Peteff
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| posted on 6/2/06 at 10:56 PM |
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I'd go with a BSPT.
It looks like an air line fitting with a tapered thread.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Avoneer
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| posted on 6/2/06 at 10:56 PM |
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I'd say BSPT as well.
Looks a bit like the one I had on my inlet manifold for the hot water.
PAt..
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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NS Dev
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| posted on 7/2/06 at 12:09 AM |
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looks like 1/4 npt to me Ned. 1/4 npt is approx 1/2" midway up the taper to the thread od, which looks similar to that. It is either that or 1/8
npt which is approx 0.4" midway up the taper (all approx before the aircraft engineers shoot me down!)
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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ned
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| posted on 7/2/06 at 09:54 AM |
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Thanks for all the responses, I recon it'll be 1/4" npt as most fuel unions commonly available are 1/8 or 1/4 so I'll get a couple
of straight unions,they're only £2 or so each and see if they fit.
cheers,
Ned.
beware, I've got yellow skin
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02GF74
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| posted on 7/2/06 at 11:15 AM |
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quote:
Originally posted by trikerneil
Could always be BSP
could be excpet BSP is not tapered.; it is clear from the picture that it is 
I'd go with the npt camp.
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David Jenkins
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| posted on 7/2/06 at 11:18 AM |
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You've got a branch of Pirtek in Guildford (according to their website). They're a great source of NPT, BSP and similar connectors.
If they're anything like the blokes in Ipswich you'll find them very useful... oh - and cheap, as well.
David
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James
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| posted on 7/2/06 at 11:24 AM |
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quote:
Originally posted by BKLOCO
If yo buy one of These you can check it yourself.
[Edited on 6-2-06 by BKLOCO]
Ned,
I've got one of those books somewhere if you want a look.
Cheers,
James
[Edited on 7/2/06 by James]
------------------------------------------------------------------------------------------------------------
"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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ned
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| posted on 7/2/06 at 11:29 AM |
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I measured the od of the thread as a tad over 1/2" and the id as near dead on 1/4" so Im gambling on it being the 1/4npt thread 
cheers again,
Ned.
beware, I've got yellow skin
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trikerneil
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| posted on 7/2/06 at 12:23 PM |
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BSP can be tapered or parallel
ACE Cafe - Just say No.
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BKLOCO
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| posted on 7/2/06 at 12:34 PM |
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quote:
Originally posted by 02GF74
quote:
Originally posted by trikerneil
Could always be BSP
could be excpet BSP is not tapered.; it is clear from the picture that it is
I'd go with the npt camp.
Guess what the "T" stands for at the end of BSPT 
Experience is what you get when you don't get what you want!!!
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britishtrident
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| posted on 7/2/06 at 01:34 PM |
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Looks exactly like 1/4" BSPT Airline hose fitting to me --- try Machine Mart
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britishtrident
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| posted on 7/2/06 at 01:48 PM |
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1/4 BSPT --- max dia at thick end of taper 12.87 mm
[Edited on 7/2/06 by britishtrident]
 
Rescued attachment quartbspt.jpg
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ned
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| posted on 7/2/06 at 02:03 PM |
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Thanks for that British Trident.
Just been on the phone to demon thieves who also sell the swirl pot and confirmed off the top of their heads that it was 1/4 npt. bits should arrive
tomorrow so hopefully can confirm that they fit!
cheers all,
Ned.
beware, I've got yellow skin
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James
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| posted on 7/2/06 at 02:51 PM |
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Knew when you posted the question BT'd know that one!
Won't bother digging that book up.... good, as I've no idea where it is!
Cheers,
James
------------------------------------------------------------------------------------------------------------
"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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ned
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| posted on 8/2/06 at 07:57 PM |
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Just to confirm I received the new fuel union and it is a 1/4" npt thread.
thanks for all the help guys.
Ned.
beware, I've got yellow skin
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