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Old 24th August 2019, 11:04 PM   #1
Ylli is offline Ylli  United States
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Default Pal-nuts

Looking for some dimensions on a pal-nut that fits a standard potentiometer. I believe the threads would be 3/8" x 32. Picture attached. What I need is the *internal* flat to flat distance. [would be the outside flat to flat - 2x material thickness].
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Old 24th August 2019, 11:11 PM   #2
rayma is offline rayma  United States
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There's no real reason for that to be standardized to just one value.
Also, these are stamped, so there are loose tolerances at best.
Why not use a regular 3/8" nut and lockwasher?

Last edited by rayma; 24th August 2019 at 11:22 PM.
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Old 25th August 2019, 01:38 AM   #3
Ylli is offline Ylli  United States
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Quote:
Originally Posted by rayma View Post
There's no real reason for that to be standardized to just one value.
Also, these are stamped, so there are loose tolerances at best.
Why not use a regular 3/8" nut and lockwasher?
Trying to remove the electronics from a 1969 Magnavox Astro-Sonic 300 console. To get the tuner/amp out, one must first remove the faceplate which is held on by 4 recessed inverted pal-nuts. There is no way to get a socket around the outside of these nuts, one must work from the inside. Magnavox had a special tool for this, but I don't want to spend $$$ on a special tool for one operation.

Figure if I know the inside flat to flat I can make a crude tool that should work. (Basically just a long nut with the threads drilled out that fits inside the inverted pal-nut. Then a nut driver on the long nut from the top.)

Last edited by Ylli; 25th August 2019 at 01:40 AM.
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Old 25th August 2019, 01:49 AM   #4
rayma is offline rayma  United States
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That's a real pain. They should have installed that essential tool somewhere in the chassis for future repairs.
I guess you could cut-and-try one, but those dimensions are not precise at all. Can you post a photo of this arrangement?

Last edited by rayma; 25th August 2019 at 01:53 AM.
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Old 25th August 2019, 02:05 AM   #5
Ylli is offline Ylli  United States
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Trying to do something better than using 'two screw drivers' or 'needled nosed pliers'.

Oh, and the console itself is at the home of an across town acquaintance, so I don't have ready access to it.

Last edited by Ylli; 25th August 2019 at 02:07 AM.
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Old 25th August 2019, 02:20 AM   #6
rayma is offline rayma  United States
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Quote:
Originally Posted by Ylli View Post
Trying to do something better than using 'two screw drivers' or 'needled nosed pliers'. Oh, and the console itself is at the home of an across town acquaintance, so I don't have ready access to it.
I would go the needle nose pliers route and just remove one. Then see if you can make a tool from that nut.
Maybe a friend at a local university or maker space can 3D print one for you.

Last edited by rayma; 25th August 2019 at 02:41 AM.
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Old 25th August 2019, 03:24 AM   #7
tsmith1315 is offline tsmith1315  United States
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Some Astrosonics will fool you into extra work- the faceplate will pop off revealing a couple of screws holding the receiver in place, no need to remove the pal-nuts.

A couple of ideas that I've heard to work on them: " clear gas line, trim the OD to shape. A hex coupler or turnbuckle, or even a hex nut of fortunate size dropped in over the shaft.

Good luck!
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Old 25th August 2019, 03:46 AM   #8
Ylli is offline Ylli  United States
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Originally Posted by tsmith1315 View Post
Some Astrosonics will fool you into extra work- the faceplate will pop off revealing a couple of screws holding the receiver in place, no need to remove the pal-nuts.

A couple of ideas that I've heard to work on them: " clear gas line, trim the OD to shape. A hex coupler or turnbuckle, or even a hex nut of fortunate size dropped in over the shaft.

Good luck!
The screws to remove the electronics are under the face plate. It won't pop off, I tried that. Your last suggestion is what I am trying to do, but it would be nice to know the internal flat to flat of typical pal-nut. Otherwise, I am going to drill out both a 7/16" and a 1/2" hex coupler (I called it a long nut) to clear the pot threads.

I did find one description that listed the outside hex of the pal-nut at 0.562 (9/16) and the material thickness as 0.017. That would make the internal about 0.562 - 0.034 = 0.528 - so the 1/2" *should* work. But I am going to drill out a 7/16 too just in case.

Wish me luck.

Last edited by Ylli; 25th August 2019 at 03:52 AM.
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Old 25th August 2019, 03:52 AM   #9
wiseoldtech is online now wiseoldtech  United States
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Boy, I'm so glad I never tossed my handy-dandy Magnavox nut removal tool!
Part number 170953-2
Given to me free by Magnavox when I was an authorized servicer for them.
Across the flats it's exactly 7/16", with a core opening of 3/8".
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Old 25th August 2019, 03:52 AM   #10
tsmith1315 is offline tsmith1315  United States
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Sorry I missed the "long nut", that's what I get for reading posts on my phone.
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