On Mon, 7 Aug 2017 05:02:56 -0700 (PDT),
wrote:

Sorry friend. Triumphs, just like American vehicles, used Unified threads back in the sixties. If you are in the spares business you would know that.


Sorry friend...Triump motorcycles didnt go to Unified theads until the
late 1960s

Most bolts on a Triumph made before '68 will be BSC thread (formerly
known as CEI thread).
Any bolts/screws less than 1/4" thread diameter will be B.A. thread
which has metric pitch but an unusual diameter.

BSC threads up to 1/2" diameter are 26 tpi. At 1/2" diameter it could
also be 20 tpi, and any diameter above 1/2" is likely to be 20 tpi.
Some threads, like on fork stanchions, are bigger than 1/2" diameter
but still 26 tpi.

Studs that screw into aluminium, like cylinder base studs, will have
Whitworth threads on the part that screws into the aluminium casting.

And yes..I have English bikes


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