It is not a question of better tolerances or better thread. In aviation
the US standard threads are used as the US dominated aviation for so
long, nuts and bolts are generally produced in UNF in aviation quality
and rightly so to keep down production costs and uniformity of
inspections and standards.
A similar thing happens to bolts for the attachment of seatbelt anchors.
All over the world 7/16"UNF.
Kees Oudesluijs
[demime 1.01d removed an attachment of type text/x-vcard which had a name of
coudesluijs.vcf]
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