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Designation system

The designations of SKF bearing accessories follow a system that consists of a product type and size identification with or without a suffix:

An example and the applicable options for lock nuts with integral locking are listed below.
Basic bearing designation system
whereKMFE =
5 =
L =

KMK 13
whereKMK =
13 =

Applicable options for lock nuts with integral locking screws

Test Designation 2
Product type
Lock nut with an integral locking screw, contact face designed for CARB toroidal roller bearings, sealed spherical roller bearings and sealed self-aligning ball bearings
Lock nut with an integral locking device

Test Designation 2
Size identification
010 mm thread diameter
12 mm thread diameter
15 mm thread diameter
17 mm thread diameter
4 to
(x5) 20 mm thread diameter
(x5) 200 mm thread diameter

Catalogue image - Test Designation 3
Suffixes (only applicable for KMFE lock nuts)
HBigger contact diameter
LSmaller contact diameter
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