On 5/20/2019 5:55 PM, Bob La Londe wrote:
... I am
concerned about shearing off threads on an 1144 bolt, ...

Reality check: how much torque/tension do you expect to put on this
locking bolt? Unless your tightening wrench is going to be a foot or
more long, the torque & tension is going to be small-ish. You could
_probably_ use aluminum and not shear the threads. IMO