help with tire valve core geometry

[SushiTrail888]

im working on machining the geometry for a tire valve core directly into a part as i dont have the space for a separate fitting. yhis means i need accurate valve stem dimensions and male threads for the cap. while i found bits of information im struggling to get a complete set of specs with tolerances. my attempts to reach manufacturers havent been fruitful likely because most are overseas. if anyone has detailed measurements or knows a reliable source for this information would appreciate the help. Thx

 

[curated_vinyl768]

Can you take a stem, cut it in half and use it for measurement?

 

[SushiTrail888]

Can you take a stem, cut it in half and use it for measurement?

using a stem as a reference could work, but cutting it might distort key dimensions if not done carefully

 

[cuts&circuits]

Great choice adding the valve core. You'll need a 0.305-32 TPI (8V1) thread for the stem, and the cap should be around 0.307-32. The internal threads for the core are 0.209-36 (5V1). If you can, check out DIN 7756 for the specs. Schrader's documents might also have what you need, though they can be tricky to find.

 

[DCRC]

Schrader Pacific catalog has the internal dims in it, I've tried to attach copy but I can't figure out how to?
Dale

 

[DCRC]

I had to register first. attached is complete catalogue.

 

[SushiTrail888]

@cuts&circuits you are a lifesaver with those thread specs and the DIN 7756 tip. That really pulls me out of a tough spot! Dale, many thanks for confirming the Schrader catalog and for trying to share it. Knowing those resources exist is a guiding light.

 

[xerxes]

If you're machining it straight into the part, those thread specs from @cuts&circuits are on point. But still double-check with a thread gauge if you can, just to play it safe.

Nice to see you're considering responses here.

 

[SushiTrail888]

If you're machining it straight into the part, those thread specs from @cuts&circuits are on point. But still double-check with a thread gauge if you can, just to play it safe.

Nice to see you're considering responses here.

Totally. The good stuff always comes from hearing how others handled it. Thanks for chiming in.

 

[cuts&circuits]

@cuts&circuits you are a lifesaver with those thread specs and the DIN 7756 tip. That really pulls me out of a tough spot! Dale, many thanks for confirming the Schrader catalog and for trying to share it. Knowing those resources exist is a guiding light.

I'm really glad to hear that! Finding those specs can be tricky, but once you have them, everything just falls into place.