King pins - REVISITED. So, in the center is an AN6 aircraft bolt that I removed from my rear truck after about 7 months of skating. Note that is is intact and did not break in that time! Well, in the quest for a potential replacement bolt, I decided to try an F911 bolt. While an AN bolt is rated at about 125Kpsi tensile and 75Kpsi shear strength, the F911 bolt comes in at 180Kpsi tensile and somewhere around 90kpsi shear strength. Since my estimates of bolt loading and stress cycles says that the AN bolt is surviving something in excess of 100K cycles which says the loading is just over half the shear strength, so maybe 38K-40Kpsi. What is important about that is that if you can keep the loading on a bolt below half it's yield stress, it can have potentially an infinite life under tha loading. Well half of 90Kpsi is 45Kpsi and if the analysis is correct, the F911 bolt may do the trick. Unlike AN bolts, they come with a long threaded portion, so I had to order a longer bolt and trim off the excess thread for the bolt I am using in the truck. My plan is to run it in the rear truck and just ride it until it either breaks or I decided it has been in there long enough (bolt installed 21.JAN.2013). So stay tuned, this may take a year or more for this "experiment" to take place, since if it takes say 6 months to hit 100K cycles, 1M cycles may take 5 years and I doubt I'll still be riding long enough to hit 10M cycles!   (62/70)