Because of metal fatigue.

Metal fatigue, old equipment.

There's metal fatigue in all the load-bearing members.

Handcuffs, like anything metal, are vulnerable to metal fatigue.

Handcuffs, like anything metal, are vulnerable to metal fatigue.

I was going to test for metal fatigue and age in the morning.

It was a result of oxidation and age, so that resulted in metal fatigue.

There's serious metal fatigue in all the load-bearing members... the wiring is completely inadequate for our power needs... and the neighborhood is like a demilitarized zone.