Originally Posted by
Hanr3
I have seen them break!
I work at Caterpillar's testing facilities. Sometimes the purpose of the test is to determine how much force the bolt will take before failure, and failure comes in many forms. I get to paid to watch all sorts of Caterpillar testing.
As for bolts stretching, they all do when properly torqued to specifications. The purpose of torqueing a bolt/nut is to load the threads which stretches the bolt. This load is the mechanical bond. Over-torqueing bolts/nuts weakens the bolt. Too much load and it will shear in half. Not enough load and they will loosen.
Exactly why you do not reuse many CAT bolts in a new rebuild. The injector hold down bolts for instance, 42lbs...loosen....42lbs...your done. If you replace the injector, you replace the bolt as they are built to stretch during torquing. Good point Hanr!
"But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your ancestors served beyond the Euphrates, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the Lord.” Joshua 25:15