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I was an aircraft structures mechanic after doing composites for over a decade. Aircraft fasteners will always be in SAE, not metric, at least in the US. The shank part (un-threaded) are in 1/32" increments. For cars, used aircraft fasteners would be OK, but larger sizes would be really hard to come by, unless you're well connected. I'm not anymore. Bummer. But the weight savings, just to do a motorcycle is somewhere in the $3500 range for a savings of only about 3 pounds, and that includes special hollow axles. In which case spending money on heavy revolving parts, like wheels (MOI), would be a bargain. Works on cars, too. Just my spin, no pun intended.
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