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Source for hardened AN960 washers

Source for hardened AN960 washers

Source for hardened AN960 washers

(OP)
Where can I find hardened AN960 (aka NAS1149) washers?  Zinc or cad plated, or stainless.  1/4" and 5/16" nominal, Rc 35 - 45.

I've tried the following without success:

McMaster-Carr
Bolt Depot
Barnhill Bolt
Aircraft Spruce & Speciality
Many others from Google searches

NAS1149E is a nice hard stainless series, but Google gives no hits on it.

RE: Source for hardened AN960 washers

See page 3130 of McMaster's on-line catalog

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