SU used BSF & BSP until about 1950, then standardised on the American
based UNF ( ANF,) and UNC (ANC.) The XPAG is full of very old METRIC
threads, due to MORRIS buying up the French HOTCHKISS factory in the UK,
who actually made GUNS for WW1, ( England 1, Germany nil.) The threads
are nearly all unique, and the term 'MAD METRIC' a good one!!!!
The tappet chest is 6mm thread on a 1mm pitch. This is almost the same
as the current ISO metric used today. You can still buy these over the
counter, and also the nuts. It is not uncommon to find people have
fitted longer studs, using nuts and fibre washers.
"Mad Metrics" on UK 01932 243534 stocks the 'soft' alloy nuts, as do
Moss and NGT.
Neil
Dave Houser wrote:
>
> Anyone who has overtightened these beauties knows that sickening feeling
> when you went too far.
> Made of aluminum or pot metal, they snap easily when you're trying to
> stop the flow of oil out the bottom corners. Anyone know of a stronger
> bolt to use here? The bolt that holds the float bowl in an SU is a bit
> shorter but may have a similiar thread. Will they work?
> Any help appreciated,
> Cheers,
> Dave(Taking the A coupe to Lime Rock Sat)
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