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Probably isn't just this simple, but...
Grade 2 bolts------no markings----yield 55k psi tensile 74k psi
Grade 5 bolts------3 radial lines---yield 92k tensile 120k
Grade 8 bolts------6 radial lines---yield 130k tensile 150k
I think you are fine with the ones you have...
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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