20,000lbs means you may need to pull over 20Gs to shear the bolt.
It is difficult to pull even 2Gs in a hard turn.
Vance;n1134070 said:Based on a quick search of the internet it appears to me a 3/8 inch grade eight bolt has a single shear strength of around 9,900 pounds.
In my opinion a grade eight bolt is not the best choice for a teeter bolt.
I use an AN-6 bolt on the teeter that appears to me based on my limited information to have a single shear strength of a little over 10,000 pounds.
In my opinion teeter bolt is in double shear.
If you are building a gyroplane from plans I feel it is best to use the hardware called out in the plans.
If you are designing a gyroplane I feel there is a lot to be learned about hardware before making a selection.