SKF AN 38 Standard Retaining Nut | High-Precision Slotted Bearing Lock Nut | Aerospace Grade Quality

The AN 38 series retaining nut (also known as a castellated or slotted nut) is a precision-engineered component essential for securing industrial bearings on a shaft against axial movement. Manufactured to strict AN (Air Force-Navy) standards, this component ensures maximum seating accuracy and reliability, crucial for high-speed or critical machinery applications. The slotted design permits the use of a key-locking washer (such as an ANW or MB series) that bends into the slot, preventing loosening due to dynamic loads, heavy vibration, and temperature fluctuations. This robust locking method ensures the correct preload and positional integrity of the bearing assembly, maximizing operational life and minimizing unexpected downtime. As an SKF quality accessory, the AN 38 retaining nut guarantees superior strength and dimensional consistency, translating directly into enhanced machine performance and easier maintenance procedures. Ideal for applications in gearboxes, heavy pump systems, electric motors, and precision equipment requiring aerospace-grade fastening standards. Choosing SKF accessories ensures perfect interchangeability and seamless compatibility with corresponding shafts and bearing seating requirements, offering product managers the assurance of a dependable solution that upholds safety and operational longevity in the most demanding industrial environments.

Key Features

• High-precision slot alignment for optimal locking washer engagement.
• Guaranteed resistance to loosening under severe vibration and dynamic loads.
• Manufactured to strict AN standards for critical, high-reliability applications.
• Provides precise axial location and retention for roller and ball bearings.
• SKF certified quality ensures material integrity and extended service life.

Technical Specifications