2B2673 Nut Slotted Fits Caterpillar ModelsOne New Aftermarket Replacement Slotted Nut (Castle Nut) for Caterpillar (Cat) Motor Graders and Track Type Equipment This 2B2673 slotted hex nut (also known as a castle nut) is a heavy duty fastener used throughout Caterpillar motor graders, track type tractors, and track skidders. It serves as a secondary fastening and locking component in structural, undercarriage, and drivetrain assemblies, helping to secure circle segment elements and other