An axle assembly comprising: an axle beam that includes: an upper surface; a lower surface disposed opposite the upper surface; a kingpin receiving hole that extends from the upper surface to the lower surface, wherein the kingpin receiving hole has a tapered portion (90, 90') that extends from the lower surface toward the upper surface and has a smaller diameter at the upper surface than at the lower surface; and a fastener hole that intersects the kingpin receiving hole; a kingpin disposed in the kingpin receiving hole that extends along a first axis, the kingpin having an angled notch; wherein the kingpin has a kingpin taper (108, 108') that mates with the tapered portion (90, 90') to inhibit movement of the kingpin toward the upper surface; and a fastener that is disposed in the fastener hole that engages the kingpin to inhibit movement of the kingpin, wherein the angled notch receives and engages the fastener, the angled notch having a first notch surface that is substantially planar and that is disposed in a nonparallel and non-perpendicular relationship with the first axis, and a second notch surface that extends from an end of the first notch surface, the first notch surface intersects the fastener hole, and the second notch surface is disposed in the kingpin receiving hole and outside of the fastener hole, the first axis is disposed in a center plane that bisects the axle beam, the angled notch is disposed substantially perpendicular to the center plane, the fastener has an angled contact surface that engages and is disposed substantially parallel to the first notch surface of the angled notch, and the fastener biases the kingpin toward the upper surface and away from the fastener hole, wherein the fastener inhibits movement of the kingpin away from the upper surface, and the axle assembly further comprises a steering knuckle that is rotatably disposed on the kingpin. an axle beam that includes: an upper surface; a lower surface disposed opposite the upper surface; a kingpin receiving hole that extends from the upper surface to the lower surface, wherein the kingpin receiving hole has a tapered portion (90, 90') that extends from the lower surface toward the upper surface and has a smaller diameter at the upper surface than at the lower surface; and a fastener hole that intersects the kingpin receiving hole; an upper surface; a lower surface disposed opposite the upper surface; a kingpin receiving hole that extends from the upper surface to the lower surface, wherein the kingpin receiving hole has a tapered portion (90, 90') that extends from the lower surface toward the upper surface and has a smaller diameter at the upper surface than at the lower surface; and a fastener hole that intersects the kingpin receiving hole; a kingpin disposed in the kingpin receiving hole that extends along a first axis, the kingpin having an angled notch; wherein the kingpin has a kingpin taper (108, 108') that mates with the tapered portion (90, 90') to inhibit movement of the kingpin toward the upper surface; and a fastener that is disposed in the fastener hole that engages the kingpin to inhibit movement of the kingpin, wherein the angled notch receives and engages the fastener, the angled notch having a first notch surface that is substantially planar and that is disposed in a nonparallel and non-perpendicular relationship with the first axis, and a second notch surface that extends from an end of the first notch surface, the first notch surface intersects the fastener hole, and the second notch surface is disposed in the kingpin receiving hole and outside of the fastener hole, the first axis is disposed in a center plane that bisects the axle beam, the angled notch is disposed substantially perpendicular to the center plane, the fastener has an angled contact surface that engages and is disposed substantially parallel to the first notch surface of the angled notch, and the fastener biases the kingpin toward the upper surface and away from the fastener hole, wherein the fastener inhibits movement of the kingpin away from the upper surface, and the axle assembly further comprises a steering knuckle that is rotatably disposed on the kingpin.