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Author Topic: oddball tap, a long shot but I will ask.  (Read 7648 times)

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Offline fflintstone

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oddball tap, a long shot but I will ask.
« on: October 28, 2012, 07:17:04 PM »
I need a .307-32 tap. This is the threads on a Schrader valve stem cap. The cheapest I have found one on line was over $50
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Offline rusty

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Re: oddball tap, a long shot but I will ask.
« Reply #1 on: October 28, 2012, 07:53:40 PM »

Not surprised, it is from a fine thread pipe thread spec for thinwall brass tubing that has been obsolete for decades and decades and decades...P

It is also the same thread as on a ford fuel rail test port, and, I believe,  an R12 refrigerant test port, so a repair tap for one of those may be an option.....

(Sorry, I *know* I don't have one of those without evenn looking)
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Offline Papaw

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Re: oddball tap, a long shot but I will ask.
« Reply #2 on: October 28, 2012, 11:40:51 PM »
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Offline anglesmith

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Re: oddball tap, a long shot but I will ask.
« Reply #3 on: October 29, 2012, 02:01:36 AM »
I'd think that if you were careful you could cut new threads on brass with that! Just cleaning it up, well thats what they made for! Good call Papaw, $15 is a lot better than $50!
Graeme
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Offline oldtools

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Re: oddball tap, a long shot but I will ask.
« Reply #4 on: October 29, 2012, 02:24:30 AM »
Those 4 way valve stem thread tool are cheap, many times you can get them for a few bucks.
But Fflintstone was asking for a "307-32 Tap". the 4 way tool has a 307-32 Die. the tap end is 210-36 (inside stem)

(Copied from another post) Schrader valve stems (passenger car type) are .305 - 32 tpi on the OD. Valve caps to fit are .307-32 tpi. This is per TRA specifications.
See also, Schrader/Bridgeport valve caps.
Standard passenger tire valve cores are threaded .206-36 on their male thread OD. And the female tapped thread for valve cores are .210-36. Also per TRA specifications.
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Offline Papaw

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Re: oddball tap, a long shot but I will ask.
« Reply #5 on: October 29, 2012, 03:07:48 AM »
Sorry! I misunderstood.
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Offline oldtools

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Re: oddball tap, a long shot but I will ask.
« Reply #6 on: October 30, 2012, 06:00:33 AM »
Papaw, That was a good idea!! too bad the tool didn't include the .307" -32 Tap.

Fflintstone are you cutting or chasing threads?

Maybe can use similar size & with same TPI, if not cutting threads.  i.e. 5/16"-32 TPI. #3 bottom tap.
maybe little too loose, but can be used as a thread chaser, i.e. scraping insides of ID.
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Offline fflintstone

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Re: oddball tap, a long shot but I will ask.
« Reply #7 on: November 20, 2012, 09:22:02 PM »
I need to cut threads in steel. could of used the tool I was going to make today.

I do need an actual tap.

I had forgoten about this post till today......
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