Bolt grade marking F8 325
Bolt grade marking F8 325
(OP)
I am evaluating a structure some ~50 years old and don't have general notes so I'm checking bolt strength by look at the grade stamped on the head. I have three lines indicating medium carbon steel, but then the grade is F8 325. Am I correct in calling this A325? Photo attached. Hopefully a stupid question...






RE: Bolt grade marking F8 325
RE: Bolt grade marking F8 325
Could F8 be FB; possibly a manufacturer? Attached is a fastener identification guide from Illinois DOT - it's the most extensive guide I've ever come across - anyway there's no F8 or FB listed.
RE: Bolt grade marking F8 325
RE: Bolt grade marking F8 325
RE: Bolt grade marking F8 325
RE: Bolt grade marking F8 325
RE: Bolt grade marking F8 325