As you progress from grade 5 up to grades 7 & 8, the commercial bolts

are even more

likely to fail catastrophically, as they are even more brittle. Hi

strength AN

hardware is much less likely to fail in this manner. In short, AN

hardware provides

a certain "safety net".

Let's see........ all six of my AN propeller bolts (1/2 VW-Wood Prop) failed
catastrophically/simultaneously.
Fortunately,  I was about 2500' over the airport when my prop splashed down
into the Ohio river, never to be seen again.  I was able to do a Bob Hoover
right into the hangar with the MiniMax.  No brakes on it either!

My six Grade8 bolts have now held tight for several years.

Bob Moore

 
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