N lock nuts are used to locate bearings onto a shaft. They have inch threads and four, equally spaced slots around their circumference to accommodate a spanner. They should be locked by a lock washer or locking plate to prevent unintentional loosening. N lock nuts can be reused, provided they are not damaged.

• Simple, stable and reliable fastening element
• Easy to install and remove
• Reusable with a new locking device
• Require a keyway in the shaft or adapter sleeve