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Schraeder valve threads

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Dougie Swan13/01/2021 12:44:06
214 forum posts
53 photos


Can anyone tell me what size the thread is on the outside of a schraeder valve



Jeff Dayman13/01/2021 12:47:37
2200 forum posts
45 photos

They are .302" x 32 TPI on the outside.

David Marks 213/01/2021 13:35:12
16 forum posts

Tracy Tools quote two sizes on their website.

noel shelley13/01/2021 13:56:47
995 forum posts
19 photos

.302 sounds wrong ! 2 sizes ! There is the one used on smaller vehicles .202 od and a larger one for BIG vehicles. Cant find one at the moment. Noel   Ah yes ! Valve cap size is .306" X32 or.8mm for cars.

Edited By noel shelley on 13/01/2021 14:25:44

Chris Evans 613/01/2021 14:14:04
1999 forum posts

All the sizes are on the net. I get away with 5/16" x 32 tpi for the bigger ones when making motorcycle retaining nuts. The bespoke taps and dies are pricey for the odd nut.

JasonB13/01/2021 14:21:51
21967 forum posts
2531 photos
1 articles

Don't know what you class as a small vehicle Noel but this is a mountain bike tube, same fitting as all the cars I've ever hadsmiley


noel shelley13/01/2021 14:31:42
995 forum posts
19 photos

I was thinking schrader valve not valve cap, so Yes jason your right ! That one is under size according to my schrader,michelin tool, .306". See edit. noel

Clive Brown 113/01/2021 14:46:12
743 forum posts
37 photos

There's also a Presta valve. 6mm od, Better for modern, very narrow rims.

Bo'sun13/01/2021 15:45:29
576 forum posts
2 photos

Going off topic, but don't forget Woods/Dunlop valves.

Mick B113/01/2021 15:53:05
2082 forum posts
121 photos
Posted by Chris Evans 6 on 13/01/2021 14:14:04:

All the sizes are on the net. I get away with 5/16" x 32 tpi for the bigger ones when making motorcycle retaining nuts. The bespoke taps and dies are pricey for the odd nut.

Yep, that works fine to connect tyre inflators to run my stationary engines.

old mart13/01/2021 15:54:15
3487 forum posts
213 photos

Wikipedia has info on Schrader valves. I have seen them used in compressed air regulators at 3000psi, and the cores look just like the short version and are the same size.

DC31k13/01/2021 17:53:41
586 forum posts
1 photos

For reference, including the term 'DIN 7756' in searches relating to tyre valve threads produces some good results.

Dougie Swan13/01/2021 22:31:45
214 forum posts
53 photos


Thankyou for all the rapid replies

This forum never fails to deliver


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