Does anyone know what size lug nuts fit a 51 ford F1 pickup?

 

The same lug nuts were used from at least '48 all the way through '96. They are 1/2"- 20. Available in any flavor or style you desire.

 

Original part number: B-1012 replaced by: B-1012-A; C0AZ-1012-A, C9AZ-1012-A, E6DZ-1012-A, and current part number: E8AZ-1012-A

These same lugnuts also fit thru 2002 on E150's which did not go with metric wheels in 1997 like the F Series trucks did.

And they were used on a gazillion different passenger cars as well. 'Little Deuce Coupe' for one example, Crown Victoria for another.

 

The threads are 1/2" -20...... but be careful. If you buy new lug nuts you will find the hex itself to be a different size. The new ones take a 3/4" socket. The original larger ones are hard to find and take a 13/16". The ones you get from NAPA now are smaller ones and won't match your originals.

I got my larger ones from "Lug Nut King." They match.

Lugnutking

 

Agree with what's been said. In addition I'll add that the National Wheel and Rim # is X-1023R. The good originals are, as said, 13/16" hex and are 5/8" tall. They have a 60 degree chamfer angle. Stu

 

All I'd add is that there are lots and lots of really crappy cheap chinese pieces out there, very poorly cut threads and soft metal. I would rather scrounge old OEM nuts than take my chances. I've had several of the chromed nuts sold at Autozone and tire stores strip out at specified torque.