Does anybody know the provenance of this bolt?  It looks aerospacey.
The letters on the head are B30US8 and the other edge has a cursive
type 'A'
I was wondering about using them for mounting the motor.

Chris Cosman

This looks like a 12-point bolt that is fairly common in modern
automobiles.   They probably work well with automated insertion tools.
The  ones I've encountered seem to be about Grade 8 or a little less and
have good anti-rust characteristics.  There is also a spline drive
variant that has deeper, rectangular grip points.

Aubrey Thompson

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