Rustproofing bolts?

[black88coupe]

Who did those? Look great!

PM sent Joe

You want a zinc dichromate coating.
Usually done in clear, yellow, green, or black.

These are now yellow zinc dichromate. 4140 steel.

 

[painlessauto]

Who did those? Look great!

Plymouth Plating did the coating

I designed them and used two build shops to get them made up. They are parts for my supercharger drive off the crank.