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Does anyone know what thread size a tire valve stem and the Schrader valve are?
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Wally
Dec 18, 2005, 10:13:58 PM12/18/05
to
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.
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.
Ed Huntress
Dec 18, 2005, 10:42:40 PM12/18/05
to
"Wally" <wa...@wallyworld.com> wrote in message
news:7j8cq1tegq7aetles...@4ax.com...
news:7j8cq1tegq7aetles...@4ax.com...
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
Richard J Kinch
Dec 18, 2005, 11:29:31 PM12/18/05
to
Wally writes:
> Does anyone know what sizes these would be?
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
Dec 18, 2005, 11:32:45 PM12/18/05
to
Richard J Kinch writes:
> I haven't confirmed these.
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.
John
Dec 18, 2005, 11:49:07 PM12/18/05
to
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
re...@to.group
Dec 19, 2005, 12:02:13 AM12/19/05
to
On Sun, 18 Dec 2005 19:13:58 -0800, Wally <wa...@wallyworld.com>
wrote:
wrote:
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
Don Foreman
Dec 19, 2005, 2:29:20 AM12/19/05
to
That internal thread sounds awful close to 12-36. I bet a 12-36 tap
would do the job.
Bugs
Dec 19, 2005, 7:21:01 AM12/19/05
to
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
fix the internal or external threads on a tire valve. I have several
lying in my toolbox.
Bugs
Bushy Pete
Dec 19, 2005, 7:49:18 AM12/19/05
to
Even out here in the outback they are around, so you should be able to find
one, check with your local tyre store!
one, check with your local tyre store!
Should cost less than a six-pack!
Hope this helps,
Pete
"Bugs" <mato...@aol.com> wrote in message
news:1134994861....@z14g2000cwz.googlegroups.com...
Wally
Dec 19, 2005, 8:16:43 PM12/19/05
to
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.
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.
Gerald Miller
Dec 20, 2005, 1:46:24 AM12/20/05
to
On Mon, 19 Dec 2005 17:16:43 -0800, Wally <wa...@wallyworld.com>
wrote:
wrote:
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
Lloyd E. Sponenburgh
Dec 20, 2005, 7:29:04 AM12/20/05
to
news:hhmeq195878hfablj...@4ax.com...
> 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.
> 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'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
Dan_Thom...@yahoo.com
Dec 20, 2005, 10:21:51 AM12/20/05
to
Don't have my books handy, but isn't it 1/16" straight pipe?
Dan
Tom Haughton
Dec 20, 2005, 9:56:18 PM12/20/05
to
That is 27 tpi.
Another poster in this thread reports it to be 32 tpi.
<Dan_Thom...@yahoo.com> wrote in message
news:1135092111....@g49g2000cwa.googlegroups.com...
Another poster in this thread reports it to be 32 tpi.
<Dan_Thom...@yahoo.com> wrote in message
news:1135092111....@g49g2000cwa.googlegroups.com...
shotgun
Aug 19, 2016, 2:18:04 PM8/19/16
to
replying to Wally, shotgun wrote:
A standard Shrader Valve male thread is .305 x 32 T.P.I. Taps are available
but very expensive!
--
for full context, visit http://www.polytechforum.com/metalworking/does-anyone-know-what-thread-size-a-tire-valve-stem-and-the-460554-.htm
A standard Shrader Valve male thread is .305 x 32 T.P.I. Taps are available
but very expensive!
--
for full context, visit http://www.polytechforum.com/metalworking/does-anyone-know-what-thread-size-a-tire-valve-stem-and-the-460554-.htm
Larry Jaques
Aug 20, 2016, 1:16:03 AM8/20/16
to
On Fri, 19 Aug 2016 18:18:02 +0000, shotgun
<0f8503901d844703ee...@example.com> wrote:
>replying to Wally, shotgun wrote:
>A standard Shrader Valve male thread is .305 x 32 T.P.I. Taps are available
>but very expensive!
That's for the cap. <g> It's .210-36 NS internal. I stopped working
<0f8503901d844703ee...@example.com> wrote:
>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 air conditioners way back, mid '80s, but they also have Schraders
and are differently sized. There are many standards now.
>Taps are available but very expensive!
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
--
The great thing about getting older is that
you don't lose all the other ages you've been.
-- Madeleine L'Engle
Tom Gardner
Aug 20, 2016, 1:42:28 AM8/20/16
to
On 8/20/2016 1:16 AM, Larry Jaques wrote:
> On Fri, 19 Aug 2016 18:18:02 +0000, shotgun
> <0f8503901d844703ee...@example.com> wrote:
>
>> replying to Wally, shotgun wrote:
>> A standard Shrader Valve male thread is .305 x 32 T.P.I. Taps are available
>> but very expensive!
>
> 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.
>
What about "Judy Blow-up Dolls"?
> On Fri, 19 Aug 2016 18:18:02 +0000, shotgun
> <0f8503901d844703ee...@example.com> wrote:
>
>> replying to Wally, shotgun wrote:
>> A standard Shrader Valve male thread is .305 x 32 T.P.I. Taps are available
>> but very expensive!
>
> 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.
>
Larry Jaques
Aug 20, 2016, 8:31:16 AM8/20/16
to
On Sat, 20 Aug 2016 01:42:18 -0400, Tom Gardner <Ma...@tacks.com>
wrote:
None of my do...oops, nevermind.
wrote:
Michael A. Terrell
Aug 20, 2016, 4:59:49 PM8/20/16
to
Ed Huntress
Aug 20, 2016, 5:01:54 PM8/20/16
to
--
Ed Huntress
alfred
Nov 14, 2017, 2:18:05 PM11/14/17
to
replying to Wally, alfred wrote:
Try M8 x 1.25 it works great
--
for full context, visit https://www.polytechforum.com/metalworking/does-anyone-know-what-thread-size-a-tire-valve-stem-and-the-460554-.htm
Try M8 x 1.25 it works great
--
for full context, visit https://www.polytechforum.com/metalworking/does-anyone-know-what-thread-size-a-tire-valve-stem-and-the-460554-.htm
Verlyn Foster
Dec 2, 2017, 11:18:14 PM12/2/17
to
replying to Wally, Verlyn Foster wrote:
You can obtain a T handle valve stem tool at any auto parts store. These have
the capability of internal and external thread repair as well as an easy out
for broken valve cores.
You can obtain a T handle valve stem tool at any auto parts store. These have
the capability of internal and external thread repair as well as an easy out
for broken valve cores.
Larry Jaques
Dec 3, 2017, 1:17:29 AM12/3/17
to
On Sun, 03 Dec 2017 04:18:02 GMT, Verlyn Foster
<0f8503901d844703ee...@example.com> wrote:
>replying to Wally, Verlyn Foster wrote:
>You can obtain a T handle valve stem tool at any auto parts store. These have
>the capability of internal and external thread repair as well as an easy out
>for broken valve cores.
https://en.wikipedia.org/wiki/Schrader_valve
<0f8503901d844703ee...@example.com> wrote:
>replying to Wally, Verlyn Foster wrote:
>You can obtain a T handle valve stem tool at any auto parts store. These have
>the capability of internal and external thread repair as well as an easy out
>for broken valve cores.
5/32-36
I finally bought 4 and put them everywhere so I could always find one
of the damned things.
4x 4 way Valve Remover Cores inside Car Tire/AC Plug Stem Installer
Repair Tools | eBay https://is.gd/HYkmaw
--
Silence is more musical than any song.
-- Christina Rossetti
Jim Wilkins
Dec 3, 2017, 7:32:23 AM12/3/17
to
"Larry Jaques" <lja...@invalid.diversifycomm.com> wrote in message
news:eg572dta6t4rkmcr9...@4ax.com...
5/16" x 32 tap cuts a thread that fits somewhat loosely but well
enough, at least to 30 PSI. Valve stem extenders can be reworked if
you don't have the tap.
news:eg572dta6t4rkmcr9...@4ax.com...
> On Sun, 03 Dec 2017 04:18:02 GMT, Verlyn Foster
> <0f8503901d844703ee...@example.com> wrote:
>
>>replying to Wally, Verlyn Foster wrote:
>>You can obtain a T handle valve stem tool at any auto parts store.
>>These have
>>the capability of internal and external thread repair as well as an
>>easy out
>>for broken valve cores.
>
> https://en.wikipedia.org/wiki/Schrader_valve
> 5/32-36
>
> I finally bought 4 and put them everywhere so I could always find
> one
> of the damned things.
>
> 4x 4 way Valve Remover Cores inside Car Tire/AC Plug Stem Installer
> Repair Tools | eBay https://is.gd/HYkmaw
I think the outer thread is nominally 0.303" or 7.7mm by 32 TPI. A
> <0f8503901d844703ee...@example.com> wrote:
>
>>replying to Wally, Verlyn Foster wrote:
>>You can obtain a T handle valve stem tool at any auto parts store.
>>These have
>>the capability of internal and external thread repair as well as an
>>easy out
>>for broken valve cores.
>
> https://en.wikipedia.org/wiki/Schrader_valve
> 5/32-36
>
> I finally bought 4 and put them everywhere so I could always find
> one
> of the damned things.
>
> 4x 4 way Valve Remover Cores inside Car Tire/AC Plug Stem Installer
> Repair Tools | eBay https://is.gd/HYkmaw
5/16" x 32 tap cuts a thread that fits somewhat loosely but well
enough, at least to 30 PSI. Valve stem extenders can be reworked if
you don't have the tap.
Mike M.
Jan 25, 2018, 1:18:06 PM1/25/18
to
replying to Larry Jaques, Mike M. wrote:
5/16" x 32 is a model engineer thread and taps and dies are available here in
theUK relatively cheaply. £1.50 for a carbon steel tap, £3.00 for a die.
About 3 times that for HSS but thats still not expensive. Ive just made a
couple of brass nuts to use an airline to preasurise a home made spray nozzle
and they fitted perfectly. I got a set for model engieering from Tracey Tools
in Devon, UK.
https://www.tracytools.com/taps-and-dies/model-engineering-taps-dies/5-32-x-32-tpi-me
Mike, in Nottingham UK
5/16" x 32 is a model engineer thread and taps and dies are available here in
theUK relatively cheaply. £1.50 for a carbon steel tap, £3.00 for a die.
About 3 times that for HSS but thats still not expensive. Ive just made a
couple of brass nuts to use an airline to preasurise a home made spray nozzle
and they fitted perfectly. I got a set for model engieering from Tracey Tools
in Devon, UK.
https://www.tracytools.com/taps-and-dies/model-engineering-taps-dies/5-32-x-32-tpi-me
Mike, in Nottingham UK
Jim B.
May 13, 2018, 5:18:30 PM5/13/18
to
replying to Wally, Jim B. wrote:
By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I am also
seeking a tap & die for such an animal.
Jim B.
By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I am also
seeking a tap & die for such an animal.
Jim B.
Jim Wilkins
May 14, 2018, 6:53:00 AM5/14/18
to
"Jim B." <0f8503901d844703ee...@example.com> wrote in
message news:DY1KC.118744$9t.6...@fx26.am4...
threads if you have the tools to adapt them. Otherwise 5/16-32 UNEF
does fit, though loosely.
message news:DY1KC.118744$9t.6...@fx26.am4...
> replying to Wally, Jim B. wrote:
> By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I
> am also
> seeking a tap & die for such an animal.
> Jim B.
Metal valve extenders are a cheap source of the male and female
> By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I
> am also
> seeking a tap & die for such an animal.
> Jim B.
threads if you have the tools to adapt them. Otherwise 5/16-32 UNEF
does fit, though loosely.
Volker Borchert
May 18, 2018, 5:19:36 PM5/18/18
to
Jim B. wrote:
> replying to Wally, Jim B. wrote:
> By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I am also
> seeking a tap & die for such an animal.
Try "G. Löser, Werkzeug, Maschinen, Kugellager" at Wiesbaden-Schierstein.
> replying to Wally, Jim B. wrote:
> By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I am also
> seeking a tap & die for such an animal.
http://www.loeser-werkzeuge.de/
--
"I'm a doctor, not a mechanic." Dr Leonard McCoy <mc...@ncc1701.starfleet.fed>
"I'm a mechanic, not a doctor." Volker Borchert <v_bor...@despammed.com>
Jim Wilkins
May 18, 2018, 6:32:34 PM5/18/18
to
"Volker Borchert" <v_bor...@despammed.com> wrote in message
news:pdndcg$228$1...@Gaia.teknon.de...
This explains Schrader and Presta valves.
http://gewindeaufschneider.de/blog/fahrradgewindearten-ventilgewinde-regelgewinde/
It gives 6 atmospheres as the maximum pressure for Schrader and 15 for
Presta, and 0.302"-32TPI as the Schrader thread.
This shows which bicycle thead standards are metric and which are
inch.
http://www.gewindeaufschneider.de/wp-content/themes/gewindeaufschneider/images/Fahrradgewinde.pdf
-jsw
news:pdndcg$228$1...@Gaia.teknon.de...
http://gewindeaufschneider.de/blog/fahrradgewindearten-ventilgewinde-regelgewinde/
It gives 6 atmospheres as the maximum pressure for Schrader and 15 for
Presta, and 0.302"-32TPI as the Schrader thread.
This shows which bicycle thead standards are metric and which are
inch.
http://www.gewindeaufschneider.de/wp-content/themes/gewindeaufschneider/images/Fahrradgewinde.pdf
-jsw
Gunner Asch
May 19, 2018, 8:03:22 PM5/19/18
to
On 18 May 2018 20:34:24 GMT, v_bor...@despammed.com (Volker
External thread: UNEF 5/16x32 fine thread
Internal thread: 0.209 in OD x 36 TPI
19/64 = 0.2969" 7.5406mm
5/16 = 0.3125" 7.9375mm
.305"x32 tap
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
Borchert) wrote:
>Jim B. wrote:
>> replying to Wally, Jim B. wrote:
>> By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I am also
>> seeking a tap & die for such an animal.
>
>Try "G. Löser, Werkzeug, Maschinen, Kugellager" at Wiesbaden-Schierstein.
>http://www.loeser-werkzeuge.de/
https://en.wikipedia.org/wiki/Schrader_valve
>Jim B. wrote:
>> replying to Wally, Jim B. wrote:
>> By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I am also
>> seeking a tap & die for such an animal.
>
>Try "G. Löser, Werkzeug, Maschinen, Kugellager" at Wiesbaden-Schierstein.
>http://www.loeser-werkzeuge.de/
External thread: UNEF 5/16x32 fine thread
Internal thread: 0.209 in OD x 36 TPI
19/64 = 0.2969" 7.5406mm
5/16 = 0.3125" 7.9375mm
.305"x32 tap
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
Volker Borchert
May 20, 2018, 7:19:39 PM5/20/18
to
Gunner Asch wrote:
> On 18 May 2018 20:34:24 GMT, v_bor...@despammed.com (Volker
> Borchert) wrote:
>
> >Jim B. wrote:
> >> replying to Wally, Jim B. wrote:
> >> By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I am also
> >> seeking a tap & die for such an animal.
> >
> >Try "G. Löser, Werkzeug, Maschinen, Kugellager" at Wiesbaden-Schierstein.
> >http://www.loeser-werkzeuge.de/
>
>
> https://en.wikipedia.org/wiki/Schrader_valve
>
> External thread: UNEF 5/16x32 fine thread
>
> Internal thread: 0.209 in OD x 36 TPI
>
> 19/64 = 0.2969" 7.5406mm
> 5/16 = 0.3125" 7.9375mm
Ist doch egal. Firma Löser sollte die Werkzeuge beschaffen können.
> On 18 May 2018 20:34:24 GMT, v_bor...@despammed.com (Volker
> Borchert) wrote:
>
> >Jim B. wrote:
> >> replying to Wally, Jim B. wrote:
> >> By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I am also
> >> seeking a tap & die for such an animal.
> >
> >Try "G. Löser, Werkzeug, Maschinen, Kugellager" at Wiesbaden-Schierstein.
> >http://www.loeser-werkzeuge.de/
>
>
> https://en.wikipedia.org/wiki/Schrader_valve
>
> External thread: UNEF 5/16x32 fine thread
>
> Internal thread: 0.209 in OD x 36 TPI
>
> 19/64 = 0.2969" 7.5406mm
> 5/16 = 0.3125" 7.9375mm
Der Versand nach Übersee wird aber möglicherweise etwas kostspielig.
Gunner Asch
May 21, 2018, 12:18:37 AM5/21/18
to
On 20 May 2018 22:10:26 GMT, v_bor...@despammed.com (Volker
Gewindegrößen gegeben .... nimm es von dort
Borchert) wrote:
>Gunner Asch wrote:
>> On 18 May 2018 20:34:24 GMT, v_bor...@despammed.com (Volker
>> Borchert) wrote:
>>
>> >Jim B. wrote:
>> >> replying to Wally, Jim B. wrote:
>> >> By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I am also
>> >> seeking a tap & die for such an animal.
>> >
>> >Try "G. Löser, Werkzeug, Maschinen, Kugellager" at Wiesbaden-Schierstein.
>> >http://www.loeser-werkzeuge.de/
>>
>>
>> https://en.wikipedia.org/wiki/Schrader_valve
>>
>> External thread: UNEF 5/16x32 fine thread
>>
>> Internal thread: 0.209 in OD x 36 TPI
>>
>> 19/64 = 0.2969" 7.5406mm
>> 5/16 = 0.3125" 7.9375mm
>
>Ist doch egal. Firma Löser sollte die Werkzeuge beschaffen können.
>Der Versand nach Übersee wird aber möglicherweise etwas kostspielig.
Es liegt an Ihnen, wie Sie damit umgehen. Ich habe dir die
>Gunner Asch wrote:
>> On 18 May 2018 20:34:24 GMT, v_bor...@despammed.com (Volker
>> Borchert) wrote:
>>
>> >Jim B. wrote:
>> >> replying to Wally, Jim B. wrote:
>> >> By my measurements it is 19/64 (7.54 mm) x 32 threads per inch. I am also
>> >> seeking a tap & die for such an animal.
>> >
>> >Try "G. Löser, Werkzeug, Maschinen, Kugellager" at Wiesbaden-Schierstein.
>> >http://www.loeser-werkzeuge.de/
>>
>>
>> https://en.wikipedia.org/wiki/Schrader_valve
>>
>> External thread: UNEF 5/16x32 fine thread
>>
>> Internal thread: 0.209 in OD x 36 TPI
>>
>> 19/64 = 0.2969" 7.5406mm
>> 5/16 = 0.3125" 7.9375mm
>
>Ist doch egal. Firma Löser sollte die Werkzeuge beschaffen können.
>Der Versand nach Übersee wird aber möglicherweise etwas kostspielig.
Gewindegrößen gegeben .... nimm es von dort
ane...@gmail.com
Mar 18, 2019, 5:11:57 PM3/18/19
to
On Sunday, December 18, 2005 at 7:13:58 PM UTC-8, Wally wrote:
While a very old thread some of the answeres puzzle.
It (standard USA tire valve) is a 8V1-32 Schrader Tyre Valve Thread Tap and Die Set 0.305-32 (.305x32)
Taps under $10, tap & die set for under 20- all day long ebay etc...
While a very old thread some of the answeres puzzle.
It (standard USA tire valve) is a 8V1-32 Schrader Tyre Valve Thread Tap and Die Set 0.305-32 (.305x32)
Taps under $10, tap & die set for under 20- all day long ebay etc...
Ted Crum
Jul 3, 2019, 10:18:05 AM7/3/19
to
replying to Larry Jaques, Ted Crum wrote:
The thread specification for the Schrader valve has almost been lost to
history by now. Of course, it is not a metric specification, 32 TPI is not
metric. The actual thread is 5/16-32 NEF, with a 80% thread height. Wait, you
say, the major diameter isn't 5/16. NO screw has a major diameter equal to
it's nominal size - look at a bolt with an unthreaded shank; the threaded part
is always smaller than the shank. I bought a 5/16-32 die a while ago and used
it to cut Schrader-compatible threads on a .305" rod, and it worked perfectly.
There are a lot of bad-fitting parts on the market now, made by offshore firms
without the institutional knowledge of archeological bent to get this right.
The thread specification for the Schrader valve has almost been lost to
history by now. Of course, it is not a metric specification, 32 TPI is not
metric. The actual thread is 5/16-32 NEF, with a 80% thread height. Wait, you
say, the major diameter isn't 5/16. NO screw has a major diameter equal to
it's nominal size - look at a bolt with an unthreaded shank; the threaded part
is always smaller than the shank. I bought a 5/16-32 die a while ago and used
it to cut Schrader-compatible threads on a .305" rod, and it worked perfectly.
There are a lot of bad-fitting parts on the market now, made by offshore firms
without the institutional knowledge of archeological bent to get this right.
Jim Wilkins
Jul 3, 2019, 11:05:28 AM7/3/19
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