Stop in for a cup of coffee
This pic tells me everything.
The outer band indicates that the stud was over-torqued at some point causing a circumferential fracture that is evidenced by the corrosssion in the outer band.
The inner “clean metal” core was then torqued to the level indicated for the entire diameter stud...but being only half that size with diameter reduced by the previous fracture, it was also way over torqued for its true diameter resulting in sudden catastrophic failure.
This pic tells me everything.
The outer band indicates that the stud was over-torqued at some point causing a circumferential fracture that is evidenced by the corrosssion in the outer band.
The inner “clean metal” core was then torqued to the level indicated for the entire diameter stud...but being only half that size with diameter reduced by the previous fracture, it was also way over torqued for its true diameter resulting in sudden catastrophic failure.
