SKF deep groove ball bearing nomenclature

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 (SKF bearing designation)

Examples and the applicable options for SKF single row deep groove ball bearings are given below.

Examples:

E2.6306-2Z where E2. = 1
6306 = 2
-2Z = 4
60/670 N1MAS where 60/670 = 2
N1 = 4
MAS = 5

1, Prefixes

E2. SKF Energy Efficient bearing
ICOS- Oil sealed bearing unit

2, Basic designation

SKF bearing designation

Figure with four digits: drawing number identification
EE(B) Inch bearing
R Inch bearing
RLS Inch bearing
RMS Inch bearing
Bearing size for SKF inch bearings 

2

to

40 

(/8) 1/4 in. (6,35 mm) bore diameter

 

(/8) 5 in. (127 mm) bore diameter

3, Suffixes - Internal design

A, AA, C, D Deviating or modified internal design
E Reinforced ball set

4, Suffixes - External design (seals, snap ring groove etc.)

N Snap ring groove in the outer ring
NR Snap ring groove in the outer ring, with appropriate snap ring
N1 One locating slot (notch) in one outer ring side face
-RS1, -2RS1 Contact seal, NBR, on one or both sides
-RS2, -2RS2 Contact seal, FKM, on one or both sides
-RSH, -2RSH Contact seal, NBR, on one or both sides
-RSL, -2RSL Low-friction seal, NBR, on one or both sides
-RZ, -2RZ Non-contact seal, NBR, on one or both sides
-Z, -2Z Shield on one or both sides
-ZNR Shield on one side, snap ring groove in the outer ring, snap ring on the opposite side of the shield
-2ZNR Shield on both sides, snap ring groove in the outer ring, with snap ring

5, Suffixes - Cage design

Stamped steel cage, ball centred
M Machined 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.
TN PA66 cage, ball centred 
TN9 Glass fibre reinforced PA66 cage, ball centred
TNH Glass fibre reinforced PEEK cage, ball centred
VG1561 Glass fibre reinforced PA46 cage, ball centred

6.1, Suffixes - Materials, heat treatment

HA1 Case-hardened inner and outer rings

6.2, Suffixes - Accuracy, clearance, preload, quiet running

P5 Dimensional and running accuracy to P5 tolerance class
P6 Dimensional and running accuracy to P6 tolerance class
P52 P5 + C2
P62 P6 + C2
P63 P6 + C3
CN Normal 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
C1 Radial internal clearance smaller than C2
C2 Radial internal clearance smaller than Normal
C3 Radial internal clearance greater than Normal
C4 Radial internal clearance greater than C3
C5 Radial internal clearance greater than C4
CA Matched bearing set with small axial internal clearance
GA Matched bearing set with light preload
VQ658 Quiet running properties

6.3, Suffixes - Bearing sets, matched bearings

DB Two bearings matched for mounting back-to-back
DF Two bearings matched for mounting face-to-face
DT Two bearings matched for mounting in tandem 

6.4, Suffixes - Stabilization

SO Bearing rings heat stabilized for operating temperatures ≤ 150 °C (300 °F)
S1 Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390 °F)

6.5, Suffixes - Lubrication

GJN 
HT 
LHT23 
LT 
LT10 
MT33 
MT47 
WT
Grease suffixes

Technical specifications of SKF standard and special greases for capped deep groove ball bearings
SKF standard and special greases for capped deep groove ball bearings

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