Lock nuts

  • Lock nuts are used to position the bearing on the shaft. In addition, they can be used to mount bearings with tapered bores to tapered bushings and retaining sleeves, and to remove bearings from withdrawal sleeves. Locknuts are also often used to secure gears, pulleys and other machine components.
  • Locknuts must be secured to prevent accidental loosening by a locking mechanism that engages with a keyway on the shaft or a keyway in the cinching sleeve.
    or a locking mechanism integrated in the nut.
  • SKF locknuts offer a variety of ways to secure the nut to the shaft. The locknuts listed here make up the basic SKF range. Locknuts with other locking methods are available upon request. For more information, please contact SKF.
  • Locknuts with integral locking reduce the cost of the shaft, as no keyway is required. Installation is faster and easier because a separate locking device is not required.
  • However, the loosening torque of these locknuts requires more attention. For information on the loosening torque, please refer to the product data section of the various locknut series.
Lock nuts


In focus of Lock nuts

Lock nuts requiring a keyway

Easy to install, the locking principle used to engage the keyway in the threads of the shaft or cinching sleeve involves simple, stable and reliable fastening elements – locking washers, locking clips or locking plates.

Lock nuts with integral locking

The friction is sufficient to lock the nut in place and installation is faster and easier because no separate locking device is required, and the cost of the shaft is reduced because no keyway is required.

Precision lock nuts

Designed for applications that require high precision, simple assembly and reliable locking with locking pins to lock the nut to the shaft.

Features and Benefits

  • There are many factors that should be considered when selecting or replacing locknuts. They include, but are not limited to
  • Space – axial and radial
  • Shaft rotation – one or both directions
  • Axial load
  • Dynamic behavior of the application
  • Cost and downtime of machining keyways on shafts versus other locking methods
  • Ease and frequency of assembly and disassembly
  • Accuracy


Loads are defined by their direction. Loads perpendicular to the shaft are called radial loads and loads parallel to the shaft are called axial (thrust) loads.

DGBB can carry axial loads in both directions, whereas angular contact ball bearings can only carry axial loads in one direction.

  • Seals and shields provide additional protection for the bearing components and help to improve and maintain lubrication.
  • In terms of sealing performance, sealed bearings rank best, followed by shielded bearings and finally open bearings.

Deep groove ball bearings are available in a large number of sizes with different seals, shields, cages, and greases.

Successful mounting is critical to the life cycle of your bearing. Proper bearing dismounting can safeguard other machine components and maintenance workers.

The bearing is at the heart of all rotating equipment, and the condition of the bearing often reflects how well a machine is running. Learn more about bearing damage and bearing failure – and how to prevent it.

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