Need thread spec for GM 9420261 nut

[Michael V.]

Re: Need thread spec for GM 9420261 nut

I just took the rear tail housing off my super original 1969 Camaro and those nuts were what was holding the inner taillight housing to the body.

[Gary B.]

Re: Need thread spec for GM 9420261 nut

Michael,

Just curious. What were those nuts screwed onto? A pot metal stud that was not threaded originally? Or some sort of steel screw or bolt?

Gary

[Michael V.]

Re: Need thread spec for GM 9420261 nut

a steel bolt.

[Gary B.]

[James W.]

Re: Need thread spec for GM 9420261 nut

Gary,

The Pal nuts you show in your original post are the same nuts that were on my late production '65 coupe and I plan to put them back on. I used Evaporust, Simple Green and a brass brush to clean them up. The picture is from my database of Corvette restoration photos.

James

[Gary B.]

[James W.]

Re: Need thread spec for GM 9420261 nut

I took Mike M's advice and used a die nut to make some treads on my new Trim Parts tail light assemblies studs to aid in threading the Pal nuts onto the new studs. Worked like a charm!

James

James,

The Pal nuts are definitely the most common finding. I know of a grand total of three ‘66s, including mine, that used the uncommon Keps nuts.

For whatever reason my original Keps nuts don’t clean up nicely with Simple Green, followed by EvapoRust. I soaked them in EvapoRust for 24 hours on two occasions, and the rust stains just don’t go away even after scrubbing with a brass bristle brush. I’m going to use steel wool or fine sand paper and then paint them to simulate gray phosphate, which I think it what they were originally. I may never use them if the risk of shearing off a lamp housing stud feels imminent, which is what another person described to me.

Gary

[Gary B.]

Re: Need thread spec for GM 9420261 nut

James,

Exactly what die nut did you use?

Gary