PDP-8 screws

[Adrian Stoness]

also see em in the audio world for rack mounting equipmednt

On Sat, Oct 27, 2018 at 11:10 AM Adrian Stoness <tdk.knight at gmail.com>
wrote:

> 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 at 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
>>
>