Installation and removal

KMK and KMFE lock nuts are easy to install. Each nut is provided with four equally spaced slots around its circumference to accommodate a hook spanner. The designations of the appropriate spanners are listed in the product table. For more information about the appropriate spanner, refer to Bearing fitting tools.

KMK and KMFE lock nuts can be reused, provided they are not damaged.


Mounting bearings on a tapered seat or special adapter sleeve (KMFE)

  1. Slide the bearing onto its tapered seat.
  2. With the contact face toward the bearing, screw the nut onto the shaft.
  3. Tighten the nut with a hook or impact spanner, until the required internal clearance in the bearing is obtained.
  4. Tighten the grub (set) screw to the torque value listed in the product table.

Locking bearings on a cylindrical seat

  1. With the bearing in position, screw the lock nut into place.
  2. Tighten the nut against the bearing with a hook spanner, making sure to not over tighten it.
  3. Tighten the grub (set) screw to the torque value listed in the product table.
  1. To remove the lock nut, loosen the grub screw. Even when the grub screw is removed, the lock nut will generate a limited locking torque.
  2. In order to completely release the locking system and facilitate the reuse of the lock nut, tap the areas near the grub screw with a hammer and soft bar. Do not damage the threaded bores for the grub screw.
  3. Unscrew the lock nut using a hook spanner.
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