Abstract: A reaction washer can include a castellated portion circumferentially disposed around a perimeter of the reaction washer and a main body portion defining an inner diameter that slidingly receives an associated threaded element therethrough. The castellated portion can include a plurality of castellations that cooperate to define an outer diameter of the reaction washer. Further, the main body can include a first side and a second side that face in opposite directions and an inner engagement ring that extends from the first side and is coaxially disposed between the inner diameter and the castellated portion. The inner engagement ring can include a plurality of serrations that each define a respective serration axis that do not intersect with the engagement axis.