Help Identifying this Vacuum Fitting

Every fusor and fusion system seems to need a vacuum. This area is for detailed discussion of vacuum systems, materials, gauging, etc. related to fusor or fusion research.
Post Reply
User avatar
Dave Xanatos
Posts: 108
Joined: Tue Apr 22, 2014 1:59 pm
Real name: Dave Xanatos
Location: Western Massachusetts, USA
Contact:

Help Identifying this Vacuum Fitting

Post by Dave Xanatos »

I haven't had a lot of hands-on with various fittings yet, just KF/NW & CF... this doesn't look like swagelock, or VCR to me... is it just NPT?

Thanks,

Dave
DSC01302.JPG
Attachments
DSC01303.JPG
It would take decades of work, by thousands of scientists, in a particle accelerator powered by dump trucks of flaming grant money! - Professor Farnsworth/FUTURAMA
Doug Browning
Posts: 156
Joined: Sat Mar 10, 2012 9:19 pm
Real name: Doug Browning

Re: Help Identifying this Vacuum Fitting

Post by Doug Browning »

Looks like the usual pipe thread for a thermocouple gauge.
User avatar
Dave Xanatos
Posts: 108
Joined: Tue Apr 22, 2014 1:59 pm
Real name: Dave Xanatos
Location: Western Massachusetts, USA
Contact:

Re: Help Identifying this Vacuum Fitting

Post by Dave Xanatos »

OK... I'm assuming that's different from NPT even... yet another new fitting to try to recognize :)

Thanks,

Dvae
It would take decades of work, by thousands of scientists, in a particle accelerator powered by dump trucks of flaming grant money! - Professor Farnsworth/FUTURAMA
User avatar
Carl Willis
Posts: 2841
Joined: Thu Jul 26, 2001 7:33 pm
Real name: Carl Willis
Location: Albuquerque, New Mexico, USA
Contact:

Re: Help Identifying this Vacuum Fitting

Post by Carl Willis »

The TC gauge thread is 1/8" NPT.
Carl Willis
http://carlwillis.wordpress.com/
TEL: +1-505-412-3277
User avatar
Dave Xanatos
Posts: 108
Joined: Tue Apr 22, 2014 1:59 pm
Real name: Dave Xanatos
Location: Western Massachusetts, USA
Contact:

Re: Help Identifying this Vacuum Fitting

Post by Dave Xanatos »

Now THAT's a familiar thread! :) Thanks.

Dave
It would take decades of work, by thousands of scientists, in a particle accelerator powered by dump trucks of flaming grant money! - Professor Farnsworth/FUTURAMA
Jerry Biehler
Posts: 975
Joined: Tue Nov 24, 2009 3:08 am
Real name:
Location: Beaverton, OR

Re: Help Identifying this Vacuum Fitting

Post by Jerry Biehler »

Yep, NPT. Just use generic teflon tape on it, I have some on a fitting on my SEM and it is sitting at 5x10^-6.
User avatar
Chris Bradley
Posts: 2930
Joined: Fri May 02, 2008 7:05 am
Real name:

Re: Help Identifying this Vacuum Fitting

Post by Chris Bradley »

Just to cover bases here, such thread couplings may also come as BSP 1/8".

BSP is 28 threads/inch, NPT is 27, otherwise all apparently the same until you find they only screw up a couple of turns and leave you wondering what's going on!

Perhaps you are unlikely to see BSP in the US, but it exists so is not impossible.

It's trouble here in UK because we get both. Gotta be careful not to scrap a thread putting one with the other!

FWIW, BSP 1/4" is 19 TPI and NPT 1/4" is 18 TPI.

For 1/2" they are both 14/inch and you can sort of use one with the other but BSP is a 55 deg thread and NPT is a 60 deg, so you get a bit of interference though stuffed with some teflon tape they tend to 'work'.

3/4" are also both 14/inch, but the NPT is a shade smaller diameter too so you can fit NPT into BSP with a bit of teflon tape wadding in the gap in an emergency but not necessarily the other way around. Not recommended!

The general note is to be mindful the two standard exist.
Jerry Biehler
Posts: 975
Joined: Tue Nov 24, 2009 3:08 am
Real name:
Location: Beaverton, OR

Re: Help Identifying this Vacuum Fitting

Post by Jerry Biehler »

BSP does show up mostly on Japanese stuff, that is what they use on most fittings.
Post Reply

Return to “Vacuum Technology (& FAQs)”