u can still get em see them on modern racks from time to time
On Sat, Oct 27, 2018 at 11:07 AM Jon Elson via cctalk <cctalk@classiccmp.org>
wrote:
> On 10/26/2018 09:19 PM, Steve Malikoff via cctalk wrote:
> > William said
> >> One the original PDP-8 ("Straight 8"), the front panel has two aluminum
> >> strips on the sides, one on the left and one on the right. Each should
> have
> >> a pair of flathead countersunk screws, likwly Phillips head.
> >>
> >> Can someone tell me the exact specs, basically thread, length, head, and
> >> material of the screws?
> >
> > I have no idea what the straight eight screws are, but for comparison
> the sort of screws in
> >
> The screws in 19" relay racks are almost all 10-32.
> Flat-heads come in 60, 82, 90 and 110 degree angles. I'm
> guessing these might be 82 degree, that is quite standard.
> To avoid marring the panels, there were things that had a
> nylon "washer" or ring that was capped by a metal "washer".
> These both had an internal angle that matched the screw
> angle. The metal washer was shorter than the nylon one, so
> ONLY the nylon washer touched the panel. The metal washer
> was to prevent the nylon one from being squashed by the
> screw. I have NO IDEA where you would find these things
> today, maybe they still make them. But, they used to be
> quite common where equipment racks were used.
>
> Jon
>
