At 01:49 PM 8/27/06 -0600, Bob Hanson wrote:
>So, I escalated to a larger 5/32" bit which I figured might actually be
>enough to clear a 4mm bolt. I have spare stainless steel nuts bolts and
>washers, so this seemed like a good size to use and it would keep from
>enlarging the eyelet hole excessively.
>
>After I was half way through the remains of the stuck 5mm bolt, the
>drill just punched through. And, on the end of the bit was wound all
>that was left of the screw itself. 95% of this threaded "shell" of the
>original screw was still intact at the end of my bit, the tiny portion
>which was missing from what otherwise would have been a complete
>cylinder of screw thread for it's entire length,
Ha! That's how I thought it would go.
>I'm still left wondering now whether someone had not previously just
>tapped the holes either originally, or certainly at least many years
>ago, with a BCS or SAE thread. And, remember, that frameset is of
>British origin. If anyone happens to know off hand whether there is in
>fact a fairly common NON-metric bolt size slightly smaller than a 5mm
>but with essentially the same threads per inch please do let me know?
An SAE 10-32 screw is a loose fit in a M5x0.8m hole. I'm sure common 10-32 screws have been used to mount fender stays and bottle cages when metric fasteners were harder to find.
John Betmanis <johnb@oxford.net>
Woodstock, ON Canada