Precision Lock Nuts are used to preload, adjust, and secure bearings, gears and other power transmission products to shafts and spindles with a high degree of stiffness. These are machined as sturdy faces and internal threads that offer a strong metal to metal locking without distortion of it. Precision Lock Nuts are also known as shaft lock nuts are used to secure bearings onto a shaft and are designed to prevent the loosening of components due to vibration and rotation.