Sputnik Locking Nut Size?

[Birdwatch66]

Long shot question; Does anyone know what the thread size is for the mounting bolt on an old Radio Shack 20-176 "Sputnik" antenna? I've searched here but didnt find anything.
Thanks.

 

[K4EET]

<snip> Does anyone know what the thread size is for the mounting bolt on an old Radio Shack 20-176 "Sputnik" antenna? <snip>

Whew! From the thread’s subject line, I actually thought you were asking for the “Locking Nut Size” on the world’s first orbiting satellite from 1957, the Russian 🇷🇺 satellite named Sputnik 1. That was going to be Radio Reference’s hardest question yet for us to answer… 😳😳😳

 

[flatfoot2421]

5/8 inch 24tpi UNEF standard for a SO239 which should be the coax interface for that antenna.

 

[merlin]

Back in those days, mounting hardware was common 1/4 x 20.
A photo of the part you are asking would help.

 

[Birdwatch66]

5/8 inch 24tpi UNEF standard for a SO239 which should be the coax interface for that antenna.

Thanks Flatfoot! I feel like a dope for not figuring that out based on the connector. Thanks again!