Lock nuts with integral locking

Lock nuts with integral locking reduce the cost of the shaft as no keyway is required. Installation is quicker and easier because no separate locking device is necessary.
KMFE lock nuts

KMFE lock nuts (fig. 1)

  • are designed to locate CARB toroidal roller bearings, sealed spherical roller bearings and sealed self-aligning ball bearings axially on a shaft
  • have appropriate contact faces for the intended bearings
  • are available for thread M 20x1 to M 200x3 (sizes 4 to 40)

KMFE lock nuts should not be used on shafts with a keyway. They should only be used with special adapter sleeves with a narrow slot. Damage to the nut can result if the grub screw aligns with a keyway or wide slot. KMFE lock nuts can be reused, provided they are not damaged.

Features and benefits

  • Maximum axial run out locating face to thread 0,020 to 0,030 mm
  • No keyway required
  • Simple to install
  • Simple and robust locking
  • Reusable
  • Appropriate contact faces for intended bearings
  • Equipped with visual marks for the use of tightening angles
KMK lock nuts

KMK lock nuts (fig. 2)

  • are intended to locate radial bearings in less demanding applications
  • are available for thread M 10x0,75 to M 100x2 (sizes 0 to 20)

KMK lock nuts should not be used on shafts with keyways or adapter sleeves with key slots. Damage to the locking device can result if it aligns with a keyway or slot. KMK lock nuts can be reused, provided they are not damaged.

The locking principle

Lock nuts with integral locking are locked by friction. The friction is sufficient to lock the nut in place.

KMFE lock nuts have an integral grub (set) screw, to lock the nut in place. When the grub screw is tightened, it causes the nut thread to deform and press against the shaft or sleeve thread (fig. 3).

KMK have a threaded steel insert in their bore. The threads on the insert match the lock-nut threads. The insert acts as a pressure plate when a grub screw, which runs through the body of the lock nut, is tightened (fig. 4).

SKF logo