Lower control arm rear shaft nut

[Joseph A.]

I am looking for some info on the rear lower control arm shaft nut 3742251 for a 1965 Corvette. Should this nut be copper flashed or is it Cad plated?

[Ron G.]

[Joe L.]

Re: Lower control arm rear shaft nut

Don’t believe it is copper flashed. My opinion is it would be a silver cadmium. Some others may reply with a different description, but I believe that the nut was a dull silver. Definitely not shiny.

Ron------

I get conflicting finish information on the 3742251 nut. Both cadmium and "copper flash" are shown in GM-sourced information. So, it might take someone with an original 1963-65 to report in.

By the way, 1963-65 used a different nut than later. The 3742251 was a standard 9/16-18 hex nut used in combination with a split lockwasher. 1966-82 used a prevailing torque lock nut with, of course, no lockwasher. That nut was definitely dull zinc plated.

[Tony S.]

Re: Lower control arm rear shaft nut

Silver cad or zinc.