TR2/3/3A TR3A solenoid jam nuts

[Tinkerman]

I seem to recall some discussion about these little jewels but can't seem to find it. I bought a solenoid from eBay years ago. It is a replica and some how while in storage all but one jam nut took a hike. I can tell you that they are not SAE fine or coarse. Can any one tell me what they are?

Thanks, Tinkerman

 

[sp53]

Hi Dick and yes they are something different. I am not sure exactly what perhaps Britishwittworth or perhaps metric. I just remember having the same problem and how I almost striped the stud.
Steve

 

[martx-5]

I remember that discussion. I think they turned out to be Brtish Standard Fine...

 

[luke44]

That would be this thread here, and yes, BSF - 5/16 (22 tpi)....

https://www.britishcarforum.com/bcforum/ubbthreads.php/topics/685644/Solenoid_nuts#Post685644

 

[Tinkerman]

I just checked the tpi with my antique General thread checker and 22tpi is perfect so I guess the originals were BSF. Replicas are probably metric grrrrr.

Dick

 

[Moseso]

Replicas are probably metric grrrrr.

At least, you can FIND those...