M5x.8 is "standard" for 99% of bike applications - dropout eyelets,
down tube shifter brazeons, etc. Not.sure why (or if in fact you
should be doing so!) your tap doesn't play nice w/ your frame - but,
careful Will Robinson!
M5x1.0 is a very obscure ("French") threading- some Simplex
retrofrictions used this.
=- Joe Bunik
Walnut Creek CA
On 9/1/16, John Hawrylak <[email protected]> wrote:
> What is the correct thread pitch for the 4mm and 5mm taps for common
> bicycle threads???
>
> I just want them to clean the threads, not do actual threading.
>
> I bought a 5mm tap with 0.8mm pitch (fine ). It will not thread into the
> dropout eyelets. Is the treading a 1.0mm pitch (coarse)?? If so, I will
> have to buy the 5mm x 1.0mmpitch.
>
> Also, bought a 4mm with 0.7mm pitch. Is this the correct pitch for 4mm
> threads??
>
> TIA
>
> John Hawrylak
> Woodstown NJ
>
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