Re: [CR]WTB/T British Seat Binder Bolt

(Example: Events:Cirque du Cyclisme:2004)

From: <Philcycles@aol.com>
Date: Mon, 14 Jan 2008 22:17:57 EST
Subject: Re: [CR]WTB/T British Seat Binder Bolt
To: gillies@cs.ubc.ca, classicrendezvous@bikelist.org


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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