PDP-8 screws

What is the thread? 6-32? 8-32? -- Will

On Oct 26, 2018 8:44 PM, "Bob Rosenbloom via cctalk" <cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>> wrote: On 10/26/2018 7:41 PM, Bob Rosenbloom via cctalk wrote: On 10/26/2018 7:19 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 PDP-11/05 are things like #6-32 x 1/2 phillips pan head, #10-32 x 5/16 phillips head truss, #8-32 x 3/8 phillips pan head nyloc, #2-56 x 1/2 phillips pan head, #4-40 x 3/8 phillips head flat. And so on it goes. I read somewhere DEC used a lot of stainless screws but that may not apply to all of them. Certainly the cheese head screws that the 11/15's 10-1/2" chassis pivots on are stainless, I checked that for curiosity's sake when I machined some special adapter washers to use with modern server slides. At any rate, you have that wondrous (but US only) fastener supplier's website to help you out. Steve. I have four straight-8 panels. All have flat head, stainless (at least non-magnetic) screws. Three have Philips head screws and one has slotted head screws. All are 0.38" total length with about 0.28" thread length. Looks to be an 82 degree countersink. Bob I just noticed the three Philips head panels have the plastic front, my only glass front has the slotted screws. Bob -- Vintage computers and electronics www.dvq.com <http://www.dvq.com> www.tekmuseum.com <http://www.tekmuseum.com> www.decmuseum.org <http://www.decmuseum.org>