Re: Torque wrench recommendations

  The reason to stay with the same grade bolt as was originally supplied
is that it's the only way to make the mfr's torque figures apply. 
Torque figured are meant to stretch the fastener to the middle of its
tensile strength.  Change the elasticity of the fastener and you change
the torque spec.  Then you don't know what the correct figure is for the
application.  

  The above is why I doubt what you said about the fastener losing its
tensile strength when torqued to the right spec.  

  Regards,

  CR