Found it: http://www.metalworld.com/trade/rs192881.html
CNAArndt@aol.com wrote:
> Chuck
>
> A couple of questions first. What year is your Lambert Bicycle? What is the
> size of the hex head of these bolt (if you even have a sample)? If it
> doesn't fit your American or metric wrenches then it is a Whitworth Form
> Thread. It sounds like this is a coarse thread which might make it BSW
> (British Standard Whitworth). If it is a 3/8" bolt it will have 16 TPI just
> like an American bolt however the angle of the threads will be 55 degrees
> with rounded crests and roots (tops and bottoms) versus 60 degrees with flat
> tops and bottoms of an American bolt, read NOT interchangeable.
>
> To confuse the issue even more many British motorcycles used CEI (Cycle
> Engineers Institue/British Standard Cycle) threads, but these were a fine
> thread (all sizes I believe had 26 TPI but early cycle threads were 20 TPI)
> and it sounds like your bolt has coarse threads.
>
> The first place that I would call is British Toll & Fastener in Los Osos,
> California. Phillip Brown is the owner and a wealth of knowledge all of the
> British thread forms.
> His number is (805) 528-0418. I know he has a web site but I don't have the
> address.
>
> I hope this helps.
>
> Cheers
>
> Curt Arndt
> Carlsbad, CA
> '55 BN1, '60 AN5
>
> In a message dated 3/2/01 8:43:32 AM Pacific Standard Time,
> chuckc@attglobal.net writes:
>
> << I'm appealing to the collective wisdom of the list to solve this
> one. I need a bolt. Two would be nice. It's somewhere
> between a 3/8 nc uUS thread and a M8 (8 mm diameter)
> 1.25 pitch metric. I believe it to be Whitworth, or something
> similar. I'm restoring an old British Lambert racing bicycle
> and these are (or would be) the crank bolts.
>
> I would like to know a) what the correct size is likely to be, and
> 2) where I might find a pair.
>
> Thanks in advance ... >>
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