Boeing 747 wing-to-fuselage MP35N bolt selection

Four MP35N bolts, ~300 ksi, hold each 747 wing on. Sourced from Standard Pressed Steel (Philadelphia).

First of all, it's non-magnetic, and I'll tell you why that's important to me. It's also — there are four bolts that are MP35N that hold the wing of the 747 onto the fuselage. Only four bolts. Now they're fair-sized bolts, but they're really high strength, like 300 ksi bolts. If you go to Standard Pressed Steel website — Standard Pressed Steel is down in Philadelphia, they make really high strength bolts — MP35N is one of the more expensive alloys, it is a pretty pricey alloy.