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Designation system

The designations of most SKF rolling bearings follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes (→ Basic bearing designation system).
An example and the applicable options for double row full complement cylindrical roller bearings are given below.
Basic bearing designation system


NNF 5016 B-2LSwhereNNF 5016 =
B =
-2LS =
Test Designation 1Prefixes (n.a.)

Test Designation 2Basic designation
Listed in table 1 or drawing number identification

Catalogue image - Test Designation 3Suffixes - Internal design
CVModified internal design, full complement roller set

Test Designation 4Suffixes - External design (seals, snap ring groove, etc.)
Modified internal design and seal (for NNF 50 series)
BImproved seal and grease
DAModified internal design and seal (for 3194.. series)
-2LSContact seal, PUR, on both sides

Catalogue image - Test Designation 5Suffixes - Cage design
VFull complement of rollers (no cage)

Catalogue image - Test Designation 6.1Suffixes - Materials, heat treatment
Bainite-hardened inner and outer rings
L4BBearing rings and rollers black oxidized

Test Designation 6.2Suffixes - Accuracy, clearance, preload, quiet running
CNNormal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range
  • H = Reduced clearance range corresponding to the upper half of the actual clearance range
  • L = Reduced clearance range corresponding to the lower half of the actual clearance range
  • M = Displaced clearance range comprising the upper half of the actual clearance range plus the lower half of the next larger clearance range
The above letters are also used together with the clearance classes C2, C3, C4 and C5, e.g. C2H.
C2Radial internal clearance smaller than Normal
C3Radial internal clearance greater than Normal
C4Radial internal clearance greater than C3
C5Radial internal clearance greater than C4

Catalogue image - Test Designation 6.3Suffixes - Bearing sets, matched bearings
DRSet of two matched bearings
TRSet of three matched bearings
QRSet of four matched bearings

Test Designation 6.4Suffixes - Stabilization (n.a.)

Test Designation 6.5Suffixes - Lubrication (n.a.)

Test Designation 6.6Suffixes - Other variants (n.a.)
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