24 Sep
2010
24 Sep
'10
3:49 p.m.
On 24 Sep 2010 at 15:20, Fred Cisin wrote:
Some computer parts have metric fasteners, some
don't.
I don't remember, but I would guess that Shugart 8" and full height
5.25" drives are not metric, but their half-height and 3.5" frives
were metric?
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.
8" floppy drives are largely imperial, mounted with 8-32 screws,
although some Japanese drives used metric.
Brass threaded PCB standoffs in early Taiwanese systems were
sometimes an interesting mixed bag--the threaded stud was often
imperial, while the threaded hole was metric.
In some Compaq Deskpro tower systems, Torx, cheese-head bolts are
used as part of the guide for mouthing drives in the case. Compaq
considerately provided a couple of rows of holes drilled in the
chassis that held Torx-head screws in both 6-32 and M3 in two labeled
rows.
--Chuck