Designation system

The designations of SKF super-precision bearings follow a system that consists of a basic designation with or without one or more prefixes and/or suffixes.

Examples and the applicable options for angular contact ball bearings are given below.

Basic bearing designation system

Examples

Single bearing:
71922 CDGBTNHA/PA9ALwhere71922 =
CD =
GB =
TNHA =
PA9A =
L =

Matched bearing set:
S7010 ACD/HCP4AQBCCwhereS =
7010 =
ACD =
HC =
P4A =
QBC =
C =

Applicable options for angular contact ball bearings

Test Designation 1
Prefixes
Open bearing (no designation prefix)
SSealed bearing
VBearing with NitroMax steel rings and bearing grade silicon nitride Si3N4 balls (hybrid bearing)

Test Designation 2
Basic designation
Bearing series
718In accordance with ISO dimension series 18
719In accordance with ISO dimension series 19
70In accordance with ISO dimension series 10
72In accordance with ISO dimension series 02
Bearing size
66 mm bore diameter
77 mm bore diameter
88 mm bore diameter
99 mm bore diameter
0010 mm bore diameter
0112 mm bore diameter
0215 mm bore diameter
0317 mm bore diameter
04
to
72
(x5) 20 mm bore diameter

(x5) 360 mm bore diameter

Catalogue image - Test Designation 3
Suffixes - Internal design
CD15° contact angle, high-capacity design
ACD25° contact angle, high-capacity design
CE15° contact angle, high-speed E design
FE18° contact angle, high-speed E design
ACE25° contact angle, high-speed E design
CB15° contact angle, high-speed B design
FB18° contact angle, high-speed B design
ACB25° contact angle, high-speed B design

Test Designation 4
Suffixes - External design (seals, snap ring groove etc.) Single bearing – execution and preload 
Single standalone bearing (no designation suffix) (718 .. D, 719 .. D, 70 .. D, 72 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series)
GASingle, universally matchable, extra light preload (719 .. D, 70 .. D and 72 .. D series)
GASingle, universally matchable, light preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series)
GBSingle, universally matchable, light preload (719 .. D, 70 .. D and 72 .. D series)
GBSingle, universally matchable, moderate preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series)
GCSingle, universally matchable, moderate preload (719 .. D, 70 .. D and 72 .. D series)
GCSingle, universally matchable, heavy preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series)
GDSingle, universally matchable, heavy preload (719 .. D, 70 .. D and 72 .. D series)

Catalogue image - Test Designation 5
Suffixes - Cage design

Cotton fabric reinforced phenolic resin or carbon fibre reinforced PEEK, outer ring centred (no designation suffix)
MAMachined brass, outer ring centred
TNHAGlass fibre reinforced PEEK, outer ring centred

Catalogue image - Test Designation 6.1
Suffixes - Materials, heat treatment
Carbon chromium steel (no designation suffix)
HCBalls made of bearing grade silicon nitride Si3N4 (hybrid bearing)

Test Designation 6.2
Suffixes - Accuracy, clearance, preload, quiet running, direct oil-air lubrication features
Accuracy
P4Dimensional and running accuracy in accordance with ISO tolerance class 4
P4ADimensional accuracy in accordance with ISO tolerance class 4, running accuracy better than ISO tolerance class 4
P2Dimensional and running accuracy in accordance with ISO tolerance class 2
PA9ADimensional and running accuracy in accordance with ISO tolerance class 2
Direct oil-air lubrication features
HTwo lubrication holes on the non-thrust side of the outer ring
H1Two lubrication holes on the thrust side of the outer ring
LAnnular groove with two lubrication holes on the non-thrust side of the outer ring and two annular grooves fitted with O-rings in the outer ring
L1Annular groove with two lubrication holes on the thrust side of the outer ring and two annular grooves fitted with O-rings in the outer ring

Catalogue image - Test Designation 6.3
Suffixes - Bearing sets, matched bearings
Arrangement
DBSet of two bearings arranged back-to-back <>
DFSet of two bearings arranged face-to-face ><
DTSet of two bearings arranged in tandem <<
DGSet of two bearings for universal matching
TBTSet of three bearings arranged back-to-back and tandem <>>
TFTSet of three bearings arranged face-to-face and tandem ><<
TTSet of three bearings arranged in tandem <<<
TGSet of three bearings for universal matching
QBCSet of four bearings arranged tandem back-to-back <<>>
QFCSet of four bearings arranged tandem face-to-face >><<
QBTSet of four bearings arranged back-to-back and tandem <>>>
QFTSet of four bearings arranged face-to-face and tandem ><<<
QTSet of four bearings arranged in tandem <<<<
QGSet of four bearings for universal matching
PBCSet of five bearings arranged tandem back-to-back <<>>>
PFCSet of five bearings arranged tandem face-to-face >><<<
PBTSet of five bearings arranged back-to-back and tandem <>>>>
PFTSet of five bearings arranged face-to-face and tandem ><<<<
PTSet of five bearings arranged in tandem <<<<<
PGSet of five bearings for universal matching 
Preload
AExtra light preload (719 .. D, 70 .. D and 72 .. D series)
ALight preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series)
LLight preload – only for matched bearings sets in TBT, TFT, QBT and QFT arrangements (718 .. D, 719 .. E and 70 .. E series)
BLight preload (719 .. D, 70 .. D and 72 .. D series)
BModerate preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series)
MModerate preload – only for matched bearings sets in TBT, TFT, QBT and QFT arrangements (718 .. D, 719 .. E and 70 .. E series)
CModerate preload (719 .. D, 70 .. D and 72 .. D series)
CHeavy preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series)
FHeavy preload – only for matched bearings sets in TBT, TFT, QBT and QFT arrangements (718 .. D, 719 .. E and 70 .. E series)
DHeavy preload (719 .. D, 70 .. D and 72 .. D series)
G...Special preload, expressed in daN e.g. G240 (718 .. D, 719 .. D, 70 .. D, 72 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series)

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


Suffixes - Lubrication (See 6.2)

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