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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: 9,308

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.
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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