Locking devices are used to locate high-precision bearings axially on a spindle or shaft. They should be made very accurately and provide even support around the whole circumference of the inner ring of the bearing. Locking devices should also be simple to mount and dismount.
Industrial design lock nuts with locking washers are not entirely suitable for high-precision applications because of the relatively wide manufacturing tolerances of the thread and abutment surfaces, which may lead to shaft deformations and alter the axis of rotation.
As a result, SKF has developed a full line of precision lock nuts
that are manufactured within very tight tolerances. These simple to mount devices that locate bearings and other components accurately and efficiently on the shaft, meet the requirements of machine tool applications, both technically and economically.
Precision lock nuts are part of the SKF standard product assortment and are generally available from stock.
For further details refer to the section "Precision lock nuts with locking pins" in the catalogue "Rolling bearings".
An alternate method of locating a high-precision bearing on a shaft is to use a stepped sleeve. A stepped sleeve is a pressure joint with two slightly different bore diameters that have an interference fit on a stepped shaft. These sleeves are typically used in high-speed, lightly loaded applications where shock loads are minimal. SKF designed the stepped sleeve for precision applications but does not manufacture or supply them.