CRES Fastener passivation

[wylde21]

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.

 

[CoryPad]

According to MIL-DTL-1222J DETAIL SPECIFICATION - STUDS, BOLTS, SCREWS AND NUTS FOR APPLICATIONS WHERE A HIGH DEGREE OF RELIABILITY IS REQUIRED; GENERAL SPECIFICATION FOR

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

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[KENAT]

Sounds like Cory has you covered. However, a standard note we use on many SS manufactured parts is:

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 may be relevant.

http://www.stellarsolutions.net/spec.htm

KENAT, probably the least qualified checker you'll ever meet...