The concept of a “safety factor” is way over rated. Next time you are on an airliner, look out the window at the engine. If you are lucky, there are 4 bolts that hold the engine on the wing, some designs only have 3.
If any of the bolts fail, the engine “should” depart the aircraft without smashing into it, or setting it on fire.
But, don’t worry, those are really good bolts!