In a message dated 1/14/08 6:47:23 PM, gillies@cs.ubc.ca writes:
> On certain GB (raleigh mid-70's-type) stems, they used a whitworth nut
> and bolt for the handlebar clamp. I have found that M8x1.00 (fine
> pitch) metric bolts give something of a "class B" fit for these nuts.
> The difference in bolt diameter is tiny :
>
> M8 = .31496 inches
> 5/16 = .3125 inches
>
>
>
> (5/16 x standard pitch x zinc) vs.
> (M8 x 1.00(fine) x stainless)
>
> and so it is not commonly manufactured.
> Lots snipped
the key is the 55 degree angle on the thread form. Metric and whitworth both
use it. Phil Brown Berkeley, Claif
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