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Old February 5, 2013, 11:16 AM   #3
Technosavant
Senior Member
 
Join Date: May 29, 2007
Location: St. Louis, MO area
Posts: 3,928
Yeah, Carpenter 158 is the steel to look for. If possible, individual HPT and MPI (High Pressure Testing and Magnetic Particle Inspection) are also preferable.

As for a used bolt, I'd be extremely cautious and would prefer a new one.
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