M7 X 1.0mm is commonly used on newer Taiwan-made stems, at least for the clamp bolts and some expanders, notably of the Profile brand.
I just checked a 1A stem and this appears to be M8 X 1.0 At least my caliper gives an OD of 7.9mm for the aluminum expander bolt. Aren't Campy Super Record post bolts also this very size?
David "Anticipating tomorrow's 6AM Fairfax vintage swap" Snyder Auburn, CA USA
> Yes, I checked Cinelli, TTT and an old AVA last night, and none match the
> M8 x 1.25. The Cinelli and TTT seem to me to be smaller than M8, but not
> as small a M7 (plus I,m not sure anyone makes M7 bolts). Is it possible
> Cinelli and TTT use an English bolt?
>
> Regards,
>
> Jerry Moos
>
>
> Ken Freeeman <freesound@comcast.net> wrote:
> I just went to the box o' stems to compare a Technomic and a Cinelli 1/A.
> No go! Diameter looks the same, but the Cinelli thread looks like a finer
> pitch, and possibly the thread depth is less (a result of the pitch?).
>
> Ken Freeman
> Ann Arbor, MI
>
> -----Original Message-----
> From: Jerome & Elizabeth Moos
> Subject: [CR]Stem expander thread
>
> I've just cut down a Nitto Technomic stem that was too long for a headtube
> on a 53cm frame with the bars set fairly low. Problem is, the expander
> bolt
> is only threaded the last few cm, so if I cut it to match the reduced stem
> length, I will cut off the threaded section. Fortuitously, it happens the
> Nitto expander uses a standard M8 x 1.25 thread and I've found a net site
> that sells stainless M8 x 1.25 socket head cap screws as long as 140mm,
> which should be sufficient. I will probably order one or two, but if these
> will work for most European and Japanese stems, I may order several more.
> Does anyone know if the M8 x 1.25 thread is common to all major European
> and
> Japanese stem expanders? Or does it vary from brand to brand? I imagine
> the older UK stems are probably English thread.
>
> Regards,
>
> Jerry Moos