Calling out MS hardware as Black Oxide fin if spec does not recognize?

[apekim]

I am interested in hearing how others are calling out MS hardware (specifically: MS35307 and MS35308) with a black oxide finish (MS35307-308B) if the Mil spec does not offer a finish code.

Thx.

 

[tbuelna]

apekim,

If you want to be formal, you can prepare an Altered Item Drawing. Specify the MS part number and the appropriate black oxide coating process for the part's material (such as MIL-DTL-13924, class 4 for 300 series cres) on the drawing.

The altered part should then be assigned a new part number.

Black oxide coating is only cosmetic in nature and does not provide corrosion protection. That is why it is not widely used in aerospace.

Hope that helped.
Terry