Not Ranked
Having worked for some 40 years as a structural analysis on aircraft I agree with Rodger. For all critical applications (things you can get hurt from a failure) you should use at least AN Bolts (125ksi minimum). Make sure the "grip" is correct for the application. Try to avoid "bolt bending" as that can kill the fastener real quick. If possible upgrade to NAS level (160 - 180 ksi) for areas you are really nervous about.
For reference a AN4 (.25 dia) has a shear strength of 3680 lb and a tension strength of 4080 lb.
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Bob McLinden
ERA FIA 2080 SOLD
Kirkham KMPS036
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