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tyre valve thread size
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Topic: tyre valve thread size (Read 7956 times)
jim
Sr. Member
Posts: 441
Country:
tyre valve thread size
«
on:
December 21, 2009, 01:07:56 PM »
i was just looking around the shed for some taps/dies. found some nuts off tyre valves (i always save them, never seam to need them!).
just wondering what thread they were
found this
http://www.gewinde-normen.de/en/valve-thread.html
its a .305" 32tpi / 7,747 x .794 pitch thread.
unless i'm missing something, how on earth did we end up with a thread that is neither metric or a fractional imp size
and whilst i'm on the subject, its bothered me for a long time that tyres are both imperial (dia in inches) and metric (the width)
i'm going to use the nuts on my poppin engine, just need to "pick up" the thread and open out a bit, it'll bother someone one day that i used M8 .8mm pitch threads
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if i'd thought it through, i'd have never tried it
Stilldrillin
Global Moderator
Hero Member
Posts: 4972
Country:
Staveley, Derbyshire. England.
Re: tyre valve thread size
«
Reply #1 on:
December 21, 2009, 01:19:13 PM »
Jim,
There are some things in this life, it is better not to know.....
I once thought about those sizes, when I was an apprentice learning to measure things.
I never did find out....... That was 50 yrs ago!
David D
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David.
Still drilling holes... Sometimes, in the right place!
Still modifying bits of metal... Occasionally, making an improvement!
sbwhart
Global Moderator
Hero Member
Posts: 3530
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Smile, Be Happy, Have Fun and Rock Until you Drop
Re: tyre valve thread size
«
Reply #2 on:
December 21, 2009, 01:42:29 PM »
Jim
Thats near as dam it 3/16 * 32 Model Engineering thread you can get taps and dies from a number of suppliers try Tracey Tools.
Hope this helps
Srew
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A little bit of clearance never got in the road
Location:- Crewe Cheshire
mklotz
Sr. Member
Posts: 260
Country:
LA, CA, USA
Re: tyre valve thread size
«
Reply #3 on:
December 21, 2009, 02:06:28 PM »
Quote
Thats near as dam it 3/16 * 32
Huh? How's that?
3/16 = 0.1875 ~= 0.305 ?
Yep, true for small values of 0.3.
(or is this one of those weird British things like hundredweights that weigh 112 lbs?)
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tel
Jr. Member
Posts: 67
Country:
Re: tyre valve thread size
«
Reply #4 on:
December 21, 2009, 02:39:27 PM »
In my experience the threads on Schraeder valves are always 5/16" x 40 tpi - don't ask me why.
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sbwhart
Global Moderator
Hero Member
Posts: 3530
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Re: tyre valve thread size
«
Reply #5 on:
December 21, 2009, 04:00:03 PM »
Whoops I mean 5/16"
Some ones been swaping the little numbers around again.
Its been a long day
Stew
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A little bit of clearance never got in the road
Location:- Crewe Cheshire
Stilldrillin
Global Moderator
Hero Member
Posts: 4972
Country:
Staveley, Derbyshire. England.
Re: tyre valve thread size
«
Reply #6 on:
December 22, 2009, 02:27:53 AM »
I`m still confused......
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David.
Still drilling holes... Sometimes, in the right place!
Still modifying bits of metal... Occasionally, making an improvement!
Bluechip
Madmodder Committee
Hero Member
Posts: 1514
Country:
Derbyshire UK
Re: tyre valve thread size
«
Reply #7 on:
December 23, 2009, 07:09:31 AM »
More confusion for you ... see 'Dunlop' threads ..
That German site has errors in it .. although not on tyre valve threads it seems ..
http://www.watchman.dsl.pipex.com/thread.html
Dave BC
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I have a few modest talents. Knowing what I'm doing isn't one of them.
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tyre valve thread size