BSC threads, which the Williams axles probably are, are not Witworth threads and have a thread angle of 60 degrees, like metric threads, so that is not a problem.
Joe Bender-Zanoni Great Notch, NJ
Geoff Duke wrote:
> Mark Buliger wrote
>
> 8mm is a TINY bit bigger than 5/16" (two and a half thousandths of an
> inch bigger), enough to take out some of the wiggle that the Williams
> bolt had. And 1.25 mm thread pitch works out to 20.3 TPI - close enough
> to 20 TPI that the bolt doesn't begin to bind noticeably over the
> half-inch or so length of engagement, despite being slightly overs
>
> While this is correct and the bolt may actually do the job the real
> difference in the two bolts lie in the angle of the thread.A Whitworth
> thread of any size has a thread angle of 55 degrees while a Metric
> thread has a thread angle of 60 degrees.A properly formed new thread
> will have the faces of the threads matching and will bind against a
> thread of a different angle.Of course a worn thread may find a mate
> more easily and not have any problems.
> Just attempting to delay anyone damaging a thread inadvertantly,
> Geoff Duke in Melbourne Australia, with summer rain today