Thread pitch (was: Multimeter recomendations

[Fred Cisin]

On Fri, 24 Sep 2010, Chuck Guzis wrote:
> 3.5" and 5.25" hard drives were mostly 6-32.  Japanese 5.25" and 3.5"
> floppies were mostly M3--some had two rows of holes in the casting--
> one imperial; the other, metric.


Yes
But what I can't remember, . . .
Was the Shugart SA400 (and SA390, etc.) imperial, and
would Shugart SA455, (&465,475) be considered an American/imperial drive,
or a Japanese one?