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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).
Examples and the applicable options for single row deep groove ball bearings are given below.
Basic bearing designation system

Examples

E2.6306-2ZwhereE2. =Test Designation 1
6306 =Test Designation 2
-2Z =Test Designation 4
60/670 N1MASwhere60/670 =Test Designation 2
N1 =Test Designation 4
MAS =Test Designation 5
Test Designation 1Prefixes
E2.SKF Energy Efficient bearing
ICOS-Oil sealed bearing unit

Test Designation 2Basic designation
Listed in table 1
Figure with four digits: drawing number identification
EE(B)Inch bearing
RInch bearing
RLSInch bearing
RMSInch bearing
Bearing size for inch bearings

2

to

40

(/8) 1/4 in. (6,35 mm) bore diameter


(/8) 5 in. (127 mm) bore diameter


Catalogue image - Test Designation 3Suffixes - Internal design
A, AA, C, DDeviating or modified internal design
EReinforced ball set

Test Designation 4Suffixes - External design (seals, snap ring groove etc.)
NSnap ring groove in the outer ring
NRSnap ring groove in the outer ring, with appropriate snap ring
N1One locating slot (notch) in one outer ring side face
-RS1, -2RS1Contact seal, NBR, on one or both sides
-RS2, -2RS2Contact seal, FKM, on one or both sides
-RSH, -2RSHContact seal, NBR, on one or both sides
-RSL, -2RSLLow-friction seal, NBR, on one or both sides
-RZ, -2RZNon-contact seal, NBR, on one or both sides
-Z, -2ZShield on one or both sides
-ZNRShield on one side, snap ring groove in the outer ring, snap ring on the opposite side of the shield
-2ZNRShield on both sides, snap ring groove in the outer ring, with snap ring

Catalogue image - Test Designation 5Suffixes - Cage design
Stamped steel cage, ball centred
MMachined brass cage, ball centred; different designs or material grades are identified by a number following the M, e.g. M2
MA(S)Machined brass cage, outer ring centred. The S indicates a lubrication groove in the guiding surface.
MB(S)Machined brass cage, inner ring centred. The S indicates a lubrication groove in the guiding surface.
TNPA66 cage, ball centred
TN9Glass fibre reinforced PA66 cage, ball centred
TNHGlass fibre reinforced PEEK cage, ball centred
VG1561Glass fibre reinforced PA46 cage, ball centred

Catalogue image - Test Designation 6.1Suffixes - Materials, heat treatment
HA1Case-hardened inner and outer rings

Test Designation 6.2Suffixes - Accuracy, clearance, preload, quiet running
P5Dimensional and running accuracy to P5 tolerance class
P6Dimensional and running accuracy to P6 tolerance class
P52P5 + C2
P62P6 + C2
P63P6 + C3
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
  • P = 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
C1Radial internal clearance smaller than C2
C2Radial internal clearance smaller than Normal
C3Radial internal clearance greater than Normal
C4Radial internal clearance greater than C3
C5Radial internal clearance greater than C4
CAMatched bearing set with small axial internal clearance
GAMatched bearing set with light preload
VQ658Quiet running properties

Catalogue image - Test Designation 6.3Suffixes - Bearing sets, matched bearings
DBTwo bearings matched for mounting back-to-back
DFTwo bearings matched for mounting face-to-face
DTTwo bearings matched for mounting in tandem

Test Designation 6.4Suffixes - Stabilization
SOBearing rings heat stabilized for operating temperatures ≤ 150 °C (300 °F)
S1Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390 °F)

Test Designation 6.5Suffixes - Lubrication
GJN
HT
LHT23
LT
LT10
MT33
MT47
WT
Grease suffixes (table 2)

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