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Found this of interest:
6. General Fasteners.
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USA industry is now using metric fasteners extensively. The remainder
of the world uses ISO metric fasteners almost exclusively, due to their
superiority in proportions, fatigue strength, pitch, size and specification
designations, and international availability.
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The Thomas Register lists hundreds of firms under Metric Fasteners, Metric
Screws, and Metric Bolts. The Industrial Fasteners Institute (IFI) has
guides for fastener types and producers.
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Metric fasteners for all aerospace applications are made readily and easily
available at "rock" bottom price to all NASA and contractor employees via NASA
GSFC Fastener
Inventory.
It appears from part c that there are metric fasteners available for use in
aerospace. Yet for some reason the link is a dead end.
Euric
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