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

Chris,
By the large radius under the head, it is most likely a structural bolt.
If you have a spare, you could hardness test it. Probably way stronger than
you need.
Larry

Its a nickel alloy 718 bolt, 1/2-20 UNJF-3A thread, with 220 ksi min
tensile and 125 kis min shear strength (very strong, well above grade
8). If its used in high fatigue applications, it should be limited to
about 114 ksi.

John Bell


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