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Schrader Tap

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Kevin F01/01/2019 17:49:05
96 forum posts
24 photos

Hello , I need to tap an internal thread for a valve cap 8v1 .307 X 32 tpi , now the question is do I need the schrader tap which is expensive or I’ve found a 5/16 x32 tpi tap at a very reasonable price ,would the unff tap be ok

Chris Evans 601/01/2019 18:36:39
1745 forum posts

I often make the round knurled retaining nuts for motorcycle inner tubes because new tubes tend to come with hexagon nuts and do not look right. I use 5/16" x 32 tap without problems.

Kevin F01/01/2019 20:23:05
96 forum posts
24 photos

Thanks Chris yes

mick H02/01/2019 08:47:33
726 forum posts
21 photos

Whilst on the subject of Scrader valves, what is the internal thread that takes the valve insert?


Howard Lewis02/01/2019 11:10:07
3605 forum posts
2 photos

I thought that Schrader valve threads are 0.75mm pitch, although if U S A manufacture are much more likely to be to an Imperial standard.

There was a similar discussion on here, some time ago.

If you can find it, that may be a help.


JasonB02/01/2019 11:27:22
18871 forum posts
2069 photos
1 articles

32 tpi for that diameter

I think the insert is 0.210" x 36 on a car size v8 valve

Edited By JasonB on 02/01/2019 11:45:48

Michael Gilligan02/01/2019 14:18:33
16363 forum posts
712 photos

Perhaps this summary would be useful: **LINK**

... unless, of course, someone has a more definitive source that contradicts it.


Edited By Michael Gilligan on 02/01/2019 14:19:01

mick H05/01/2019 13:08:32
726 forum posts
21 photos
Posted by mick H on 02/01/2019 08:47:33:

Whilst on the subject of Schrader valves, what is the internal thread that takes the valve insert?


Michael's link gives it at 5.30 x .7 something , but fiddling around this morning, !BA is as near as dammit and seems to work well.


Howard Lewis05/01/2019 21:25:45
3605 forum posts
2 photos

The Model Engineers Handbook gives 1 BA as having a top diameter of 5.3mm, and a pitch of 0.9mm


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