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Does anybody know what the thread size is on a bicycle pump connector, such as this one?

enter image description here

Note: I'm not talking about the female end that goes on the valve stem on the bike (that's a Schrader valve thread), I'm talking about the male end that connects with the pump. It looks almost like an M5, but doesn't quite fit in an M5 female connector.

I have spent quite a bit of time googling the question, but have drawn a blank so far.

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  • $\begingroup$ As it is usually in soft metal, the UNC or Whitworth spring to mind... $\endgroup$
    – Solar Mike
    Nov 23 '17 at 12:04
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    $\begingroup$ Maybe this question is more suitable for bicycles.stackexchange.com $\endgroup$
    – False Identity
    Nov 23 '17 at 14:24
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I'm pretty sure it's the same thread as a Presta valve thread.

Which is defined by ISO 4570 designation "5v2", and is similar to "12-24 UNC"

(edit to add ISO reference)

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  • $\begingroup$ So it is! Thank you. You don't happen to know if there any off-the-shelf thread adapters between say M5 and Presta threads? $\endgroup$
    – am304
    Nov 28 '17 at 12:40
  • $\begingroup$ no, sorry I don't. $\endgroup$
    – LittleNose
    Nov 28 '17 at 13:05
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3/16 BSF (3/16in dia 32 turns per inch)

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    $\begingroup$ Do you have any reference to go with this? There is already an accepted answer that differs from what you gave. $\endgroup$
    – hazzey ♦
    Jun 20 '18 at 21:35

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