Thanks so much for the info Odd. Does this mean that the bolts could be
replaced with modern metric bolts or was there a peculiar thread rate as
well? I would like to know, because a friend has offered me a box of old
"Whitworth" nuts and bolts to use on my Lagonda restoration. However, he
mentioned that they had come off a TD and a late '40s Riley among others.
John
>Hi friends,
>as a small comment to the recent thread on odd or such threads...
>
>John McEwen skrev:
>...
>> Most LBCs prior to the sixties used Whitworth fasteners - except
>> Standard-Triumph.
>
>And except all the MG T-series! They used the "Mad Metric" type in
>their engines! The most weird of all standardized fasteners ever!!!
>
>Mad Metric was [is] a line of fasteners that emerged after the
>Nuffield Group purchase of the French Hotchkiss engine plant in
>the early thirties... To save on production and handtooling costs
>they kept the metric size threads BUT changed the heads to standard
>Whitworth size heads!?! ;-(
>So Nuffield group engines from around 1936 up to 195x something had
>these weird Mad Metric fasteners. How typically British.
>
>It really does wonders for ones spare part storing system! ;-)
>Not only we have to stock UNF, UNC, Whitworth and Metric bolts, set-
>screws, nuts and nyloc nuts... We also have to stock a horrible half-
>breed between Whitworth and [a few really odd French] Metric sizes.
>And not the ordinary M4, M6, M8, M10 etc sizes to that. No, the
>French had to use the in-between sizes of M7, M9 etc [which is OK and
>legal standard in the metric thread system, BUT definitely] not used
>anywhere in the rest of the metric civilization...
>
>Just my two coins worth of thoughts...
>
>But I do recommend the SI system of measurements!!!
>As long as we do not let the French use it into the extreme, then
>such accidents happen as the M7 and M9 threaded bolts... ;-)
>
>Yours
>/Odd
>
>
>--
>
>Odd Hedberg
>Pomonagatan 4
>S-74236 Östhammar International liaison secretary,
>Sweden Triumph Club of Sweden
> '70 Spitfire Mk3 FD82497LO Signal Red
> E-mail: odd@triumphclub.se / odd.hedberg@bigfoot.com
> Club URL: http://www2.passagen.se/triumph/
> Home Telephone: Int+ 46-1731 7131
>Geographical Position: N 60deg15min E 18deg23min
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