Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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 Posted: Wed Feb 09, 2011 12:27 pm Post subject: D-sub screws |
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Cheers,
No matter how you number/letter them, the D-sub series connectors (plugs/sockets) have captured threaded screws which lock pairs together. Bob Nuckols’ Aeroelectric connection described these as torments because the captured screws are often long thin (1/8”) jobs witha screwdriver slot at the end which is often unassailable – due mainly to confined spaces.
He proposed replacing them (they are over here anyway, #4-40 threads on the bottom 12mm=1/2 of the screw) by a device which combines 4/40 threads with an extended ‘nut’ which is in effect a hex column anywhere from 12mm to 37mm in length and having either internal or external threads. They are variously called ‘spacers’ or ‘standoffs’ (when used to separate circuit boards usually one end Male and the other female) or’ couplers ‘ or ‘coupling nuts’ when used to join lengths of threaded rods.
When the female end of the devices is populated with ½” lengths of 4-40 rod it can replace the difficult screws (para 1 above) with a turning hex of 3/16” diameter – so can be tightened or un- with a small wrench from the side or driven by a 3/16” socket from above. I need these because of the positioning of some of my D-sub plugs in difficult corners.
Ah, but caution! If you are too follow this regimen by fabricating these jobs, make sure the 4-40 ‘jackscrews/spacers/coupling nuts/standoffs’ are 3/16” across BECAUSE they are often flogged with ¼” bodies and these latter sizes jam against the body of the plug and are unuseable.....!
Best thoughts,
Ferg [quote][b]
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