SKF W 20 Lock Washer | High-Precision Anti-Rotation Washer for KM/HM 20 Lock Nuts

The SKF W 20 Lock Washer is a vital component engineered to ensure the absolute security and rotational stability of industrial bearing arrangements utilizing adapter or withdrawal sleeves. Designed specifically for use with KM 20 or HM 20 series lock nuts, the W 20 prevents loosening under severe operational conditions involving heavy vibration, high speed, and frequent start/stop cycles. Manufactured from high-grade, resilient steel and precision-stamped, this anti-rotation device features external tabs that fold securely into the keyway slot of the shaft or sleeve, effectively locking the nut position and maintaining critical axial pre-load. Consistent use of genuine lock washers is mandatory to protect the bearing arrangement's integrity and extend the lifespan of costly components. Investing in the W 20 Lock Washer guarantees maximum operational uptime and minimizes the risk of catastrophic bearing failure caused by self-loosening components. As a low-cost, high-impact accessory, its adherence to stringent SKF quality standards ensures a perfect fit and dependable locking mechanism in critical industrial machinery, including conveyor systems, pumps, textile equipment, and general transmission applications. The simplicity of installation and inspection, combined with unparalleled reliability, makes the W 20 the default choice for maintenance professionals seeking robust, secure mounting of spherical, tapered, and self-aligning bearings on smooth shafts. It is the essential last step in precise bearing mounting.

Key Features

• Precision-stamped steel construction ensures robust integrity and tight fit.
• Anti-rotation tab design prevents lock nut loosening under severe dynamic loads and vibration.
• Mandatory accessory for KM 20 and HM 20 lock nuts on industrial shafts and sleeves.
• Essential for maintaining precise axial preload in spherical roller and tapered roller bearing applications.
• Simple, reliable installation and visual inspection of security.

Technical Specifications