CRES Fastener passivation
CRES Fastener passivation
(OP)
Hello,
I am having difficult time finding information on common (commercially available) imperial sized fastener specifications and configurations. Particularly with regard to CRES fasteners used in the USA.
Are CRES fasteners that are purchased 'off the shelf' normally passivated? If not, is there a specification for prior to purchase fasteners that are passivated (maybe for the aerospace industry?). I am trying to avoid having to create manufactured parts for hundreds of CRES screws/nuts/washers we use in various machine designs that may need to be passivated for various applications.
Also, if I am forced to specify a fastener and then a passivation process, what is the most common (to USA) passivation specification that I should reference? I see that MIL-S-5002 is sometimes used, but when I looked it up that MIL spec is inactivated/cancelled.
Thank you much.
I am having difficult time finding information on common (commercially available) imperial sized fastener specifications and configurations. Particularly with regard to CRES fasteners used in the USA.
Are CRES fasteners that are purchased 'off the shelf' normally passivated? If not, is there a specification for prior to purchase fasteners that are passivated (maybe for the aerospace industry?). I am trying to avoid having to create manufactured parts for hundreds of CRES screws/nuts/washers we use in various machine designs that may need to be passivated for various applications.
Also, if I am forced to specify a fastener and then a passivation process, what is the most common (to USA) passivation specification that I should reference? I see that MIL-S-5002 is sometimes used, but when I looked it up that MIL spec is inactivated/cancelled.
Thank you much.





RE: CRES Fastener passivation
3.6.4 Corrosion-resistant steels. Corrosion-resistant steel fasteners
shall be descaled, cleaned and passivated in accordance with ASTM A 380.
ASTM A 380 Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
is available from ASTM International here:
http://www.astm.org
Regards,
Cory
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RE: CRES Fastener passivation
FINISH: CLEAN & PASSIVATE TO SAE AMS 2700.
We researched this about 2 years ago and it sounded about right but I think there's actually more to the story.
FYI thread1135-153287: AMS 2700: Which Type with Which Grade? may be relevant.
http://www.stellarsolutions.net/spec.htm
KENAT, probably the least qualified checker you'll ever meet...