Bearing Locknut 0033657 – HW-559

This bearing locknut follows the N-11 and SFN-11 industry standard, a widely used size that cross-fits across multiple forklift brands including Hyster, Yale, Toyota, Caterpillar, Mitsubishi, Clark, and Crown wherever this bearing size is specified. Being an industry-standard part rather than a brand-specific one, it is manufactured by a range of bearing suppliers under the same N-11 designation.

The locknut is machined from steel with a 2.157 inch inside diameter, 2.9688 inch outside diameter, and 0.51 inch thickness, and weighs 0.5 pounds. Its function is to thread onto a shaft and clamp a bearing's inner race in place, preventing the bearing from shifting axially under load during operation.

As a threaded fastener under constant vibration and load, a locknut can loosen over time if not torqued to specification, which allows the bearing it secures to shift and develop play. A loose locknut on a load-bearing shaft typically shows up as increased wheel or shaft wobble and accelerated bearing wear. Because the N-11 size is standardized across the industry, this locknut is a practical stocking item for shops servicing a mixed fleet of forklift brands.