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It's a cantilever beam with a point mass of 347.4 oz. on its tip. The distance from the load to the other end is 2 in., and the beam has a radius of 1/8". This is the calculation I found for bending stress:

bending stress (psi) = bending moment (lbs. in.) * distance from load to edge (in.) / second moment of inertia (in^4)

I researched the second moment of inertia to be (pi/4)*r^4 for a solid cylinder. So I plugged that in...

((21.7125 lbs. * 2 in.) * 2in.) / (pi/4 * (1/8 in.)^4)

...and got a result of about 450,000 psi. This feels like way too high a number, so I'd like to know what I'm doing wrong here. Thank you!