1774658 Nut-Bearing Fits Caterpillar ModelsOne New Aftermarket Replacement Bearing Lock Nut for Caterpillar (Cat) Equipment This bearing lock nut (Caterpillar part number 1774658 177 4658) is a 2 7 8" 12 threaded fastener used to secure and retain bearings on a shaft or spindle assembly. Bearing lock nuts maintain precise bearing positioning, prevent axial movement, and hold bearing preload settings during operation. This type of fastener is commonly found in axle, drivetrain, and wheel end