Did you know that you can adjust a marginal joint by going outside the torque tables? Most bolting applications define bolt torques using standard tables and try to bring bolts up to slightly less than yield, say 3/4 of proof load.
You need to stay well below yield when using this torquing technique because a torque wrench’s gauge doesn’t read any higher once a bolt yields.
But a bolt lives because it’s preload is so far above the fluctuating applied load that it seems static.
By applying some expert math and the turn-of-the-nut torquing method, we were able to bring these bolts up above yield without bolt failure. The applied load was insignificant from a stress point of view and enabled the bolt to live in a difficult environment.