Back To Index

Lock nuts with locking screw

Lock nuts with locking screw Lock nuts with locking screw (fig 1) are designated KMFE. The locking screw presses a small part of the nut thread onto the shaft thread and prevents the nut from turning (fig 2).

Mounting and dismounting are simple and the axial location effective and reliable. Neither additional locking washers nor keyway in the shaft are required. The KMFE nuts can be re-used.

The KMFE nuts have slots in the outside diameter so that they can be tightened using a hook or impact spanner. A hexagonal wrench is needed to tighten the grub screw. Appropriate sizes of the spanner are provided in the product table. Tighten the grub screw, until the recommended tightening torque quoted in the product table is obtained.

Dimensions The dimensions and the thread of KMFE nuts are in accordance with ISO 2982-2:1995, except for the width. The grub screw correspond to ISO 4026:1993, material class 45H.

Tolerances The metric ISO thread is machined to tolerance 5H according to ISO 965-3:1998.

The maximum runout between the thread and the locating face is 0,04 mm.

Material SKF lock nuts in the KMFE series are made of steel and are protected by a solventless rust inhibitor.

Mating shaft threads

SKF recommends that the mating thread on the shaft be made to 6g according to ISO 965-3:1998.


Bearing accessories | Adapter sleeves | Withdrawal sleeves | Lock nuts | Lock nuts with locking washer or clip | Lock nuts with locking screw | Lock nuts with integral locking device | Precision lock nuts with locking pins | Hydraulic nuts