I have a spring supplier produce a custom design spring for me.
Material and finish is as follows;
- Material is 17-7PH per AMS 5678.
- Passivate per AMS 2700 method I, type 8.
I have a note on my drawing which states;
"shall conform to SAE-AS13572, Type I Grade A, less centerless ground wire per 3.1.1."
My question is this:
Would the spring manufacturer be required to apply supplementary preservation coating as defined in paragraph 3.4.2? or is the supplementary coating applicable to carbon steel rings only?