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What size nut goes onto a typical US passenger tire Schrader valve?



 
 
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  #71  
Old April 30th 20, 03:00 PM posted to rec.autos.tech
[email protected]
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Posts: 1
Default What size nut goes onto a typical US passenger tire Schrader valve?

On Tuesday, December 6, 2016 at 11:07:38 AM UTC-7, Leon Schneider wrote:
> What size nut goes onto a typical US passenger tire Schrader valve?
>
> To insert the tire valve, I know there is a ridiculously cheap cross-type
> valve tool where you thread it on the outside of the tire valve to pull the
> tire valve through the hole in the wheel rim, but for emergency use I just
> want to stock a few nuts that I can thread on the outside of a new valve to
> use as a ledge to pull the tire valve through the hole as shown he
> https://d3vl3jxeh4ou3u.cloudfront.ne...e%20pliers.jpg
>
> Looking for what nuts to purchase, the Wikipedia for Schrader valves says
> the typical passenger brass & rubber tubeless tire pop-in Schrader valve
> has OD threads of:
>
> *TR 418, 0.453 in (11.5 mm) rim hole diam. 2 in (51 mm) long*
>[*] Metric: 7.7 mm OD, thread root diameter is 6.9 mm ? 0.794 mm pitch
>[*] Imperial: 0.305 in OD, thread root diameter 0.271 in ? 32 tpi (threads
> per inch; thread density)
>
> Assuming "Imperial" means "USA", that would mean I need a 32 TPI nut
> somewhere between 0.271 inches and 0.305 inches in iD, but that doesn't
> seem to be a standard size for a USA nut.
> http://www.engineeringtoolbox.com/in...nts-d_471.html
>
> Even if I look deeper into the granularity, it still seems an odd size:
> http://www.liming.org/InMoov/pics/decimalchart.jpg
>
> So I simply ask you if you have experence with this problem.
>
> What size nut goes onto a typical US passenger tire Schrader valve?


There is another reason to need this nut. Dually tires use valve extenders for the inner tire. The extender is fastened to a plate and held in position with a nut that is threaded onto the valve. That is the nut Leon is referring to. I lost one on my rv and am having a problem finding a replacement.
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  #72  
Old April 30th 20, 06:43 PM posted to rec.autos.tech
Scott Dorsey
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Posts: 3,914
Default What size nut goes onto a typical US passenger tire Schrader valve?

> wrote:
>On Tuesday, December 6, 2016 at 11:07:38 AM UTC-7, Leon Schneider wrote:
>>=20
>> What size nut goes onto a typical US passenger tire Schrader valve?

>
>There is another reason to need this nut. Dually tires use valve extenders =
>for the inner tire. The extender is fastened to a plate and held in positio=
>n with a nut that is threaded onto the valve. That is the nut Leon is refer=
>ring to. I lost one on my rv and am having a problem finding a replacement.


This is not a standard sized nut. The device you are looking for is
specifically threaded to fit the Schrader valve. If you google
"Schrader valve nut spacer" you should be able to find such a thing.

Otherwise it would be easier to talk to the company that made the extender.

You could cut your own on a lathe if you had the right gears available.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
  #73  
Old April 30th 20, 07:05 PM posted to rec.autos.tech
Eli the Bearded
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Posts: 3
Default What size nut goes onto a typical US passenger tire Schrader valve?

In rec.autos.tech, Scott Dorsey > wrote:
> > wrote:
>> There is another reason to need this nut. Dually tires use valve
>> extenders for the inner tire. The extender is fastened to a plate and
>> held in position with a nut that is threaded onto the valve. That is
>> the nut Leon is referring to. I lost one on my rv and am having a
>> problem finding a replacement.

> This is not a standard sized nut. The device you are looking for is
> specifically threaded to fit the Schrader valve. If you google
> "Schrader valve nut spacer" you should be able to find such a thing.


This is probably the easy solution.

> Otherwise it would be easier to talk to the company that made the extender.
>
> You could cut your own on a lathe if you had the right gears available.


My notes say it's 0.305-32 and searching ebay for "0.305-32 tap die"
gets results that include "Schrader" in the listing title.

Elijah
------
probably easier than the lathe
 




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