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Old 09-22-2020, 08:18 AM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,256
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The main concern is in situations where the plans call out the use of washers as spacers......

Even though both washer designations are aircraft grade hardware, the NAS part has a much tighter tolerance for thickness than the AN washers have.

This causes a lot of problems when calling out a specific # of washers for an assembly that they are used as spacers in.

So in instances where you are just using a washer for the common purpose of load distribution and abrasion protection AN960's are fine, but NAS should be used when it looks like a specified stack-up is dimensionally sensitive.
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Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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