FAG (Schaeffler) KM21 Locknut

FAG (Schaeffler) KM21 Locknut is a precision locking nut from FAG's bearing-division lineup, designed to secure components in shaft and bearing assemblies. The KM21 designation identifies the specific locknut model within Schaeffler’s catalog, enabling reliable mating with compatible components following FAG’s engineering standards. By providing axial retention and resistance to loosening under vibration and dynamic loads, the KM21 helps maintain preload and alignment in rotating hardware. As an OEM-grade fastener from a trusted supplier, it supports dependable performance in precision machinery and automated systems that rely on secure, repeatable assembly. When selecting KM21, engineers should verify compatibility with the corresponding shafts, adapters, or bearing housings per FAG’s documentation and follow proper installation procedures to ensure effective locking action. For exact dimensions and fit, refer to FAG’s official specifications.