Abstract: A fastener assembly for securing a first structure to a second structure. The fastener assembly generally includes a bolt, a nut, and a locking washer. The locking washer has a plurality of side walls and corner regions. The locking washer has an eccentric aperture, meaning an aperture that is off-center or not aligned with the center of the locking washer. The locking washer is rotatable between an initial position wherein a first side wall does not engage the second structure, an intermediate position wherein a first corner slidably engages the second structure, and a locked position wherein a second side wall engages the second structure. The side walls have numerous teeth configured to engage the second structure in the locked position. In the locked position, the locking washer exerts both a clamping force and a gripping force to fixedly secure the first structure and the second structure.