Does anyone know what thread size a tire valve stem and the Schrader valve are?

I've got an automatic chicken waterer (made by Little Giant) that uses what looks to be a truck valve stem and a common automotive Schrader valve. It froze again and broke a fitting and I have tried to find a tap and die in the past that matched up to these threads, but no luck. I tried Google and am probably using the wrong key words, but no luck there either. Does anyone know what sizes these would be? Thank you.

  Quoted Text Here  
We went over this here a few years ago, so it should be archived on Google Groups. It's really odd and a couple of us did some digging to come up with it.
-- Ed Huntress

Ed Huntress wrote:
  Quoted Text Here  
I went through that a while ago. The external threaded part of a Schrader valve is 7.7 mm (.302") x 32 T.P.I.
YOu think my memory is that good. I found it on the site below.
http://www.sheldonbrown.com/gloss_sa-o.html
John

First off, thank you for the information. I figured if I knew the size I could get the taps and dies, but they don't seem to exist. I've got the little 4 way tool with the thread chasers, but am really surprised that no one seems to make a tap and die set for these valves. McMaster-Carr doesn't have them and a google search doesn't pull up any, either.
I was able to make a replacement part from a piece of nylon and fudge the threads close enough that it seems to be working fine. But the lack of taps and dies is a surprise.

wrote:
  Quoted Text Here  
Any time I need these threads, I take a discarded valve stem from the tire shop garbage, cut the rubber off, wire brush it clean and silver solder it in place. I even have one of these complete with core and installation tool/valve cap in the glove box in case some a**hole pulls a core on my vehicle again. Gerry :-)} London, Canada

  Quoted Text Here  
I've fought this several times while making custom accessories. I forget precisely what thread it is, but IIRC, it's a 5/16"-34... a REALLY bastard form.
I finally took one of the better quality chasers and hardened it to use as a tap (in brass, only).
I called Schraeder valve, and they DO make the tap -- about $140, custom-run only.
LLoyd

Don't have my books handy, but isn't it 1/16" straight pipe?
Dan

That is 27 tpi. Another poster in this thread reports it to be 32 tpi.
  Quoted Text Here  

Wally writes:
  Quoted Text Here  
Reputedly:
Internal thread 0.209 inches (5.3mm) by 36 threads per inch (0.706mm pitch), External thread is 0.302 inches (7.7mm) by 32 threads per inch (0.794mm pitch).
I haven't confirmed these.

Richard J Kinch writes:
  Quoted Text Here  
And I should add, that the reputed measurements aren't sufficient specifications for actually cutting these threads, if that's what you had in mind, although if you know thread-cutting, you can figure it out.

On Sun, 18 Dec 2005 22:29:31 -0600, Richard J Kinch
  Quoted Text Here  
That internal thread sounds awful close to 12-36. I bet a 12-36 tap would do the job.

wrote:
  Quoted Text Here  
The following link it's
7.7 mm OD 32 tpi, or 0.794 mm pitch Minor diameter is 6.9mm Thread designation is .305-32 or 7.7-32
http://www.engineersedge.com/wwwboard/posts/2386.html

Most automotive stores sell a thread chaser for tire valves. It will fix the internal or external threads on a tire valve. I have several lying in my toolbox. Bugs

Even out here in the outback they are around, so you should be able to find one, check with your local tyre store!
Should cost less than a six-pack!
Hope this helps, Pete
  Quoted Text Here  

replying to Wally, shotgun wrote: A standard Shrader Valve male thread is .305 x 32 T.P.I. Taps are available but very expensive!

On Fri, 19 Aug 2016 18:18:02 +0000, shotgun
  Quoted Text Here  
That's for the cap. <g> It's .210-36 NS internal. I stopped working on air conditioners way back, mid '80s, but they also have Schraders and are differently sized. There are many standards now.
  Quoted Text Here  
Here, maybe. $25.10 for a North American Tool tap. http://tinyurl.com/h3zlc5v
But If you're just chasing threads, you can get a 4-way valve tool for $1.46 or four for $5.65 on Ebay. Tap, die, valve remover, and reamer. http://tinyurl.com/j6vsa58 or http://tinyurl.com/j94fodn

On 8/20/2016 1:16 AM, Larry Jaques wrote:
  Quoted Text Here  
What about "Judy Blow-up Dolls"?

wrote:
  Quoted Text Here  
None of my do...oops, nevermind.

Tom Gardner wrote:
  Quoted Text Here  
Isn't 'Fast Eddie' the only expert on those?

On Sat, 20 Aug 2016 16:59:50 -0400, "Michael A. Terrell"
  Quoted Text Here  
What's that supposed to mean, asshole?