Designation

                                                                                                                      

 

 

SKF-Bearing data - general

SKF-- Prefixes

SKF - Suffixes:  A-B C   D-F    G-K   L-N   P-S   T-Z

A. SKF-Bearing data - general

Designations - Identification of bearing type
0 Double row angular contact ball bearings
1 Self-aligning ball bearings
2 Spherical roller bearings, spherical roller thrust bearings
3 Tapered roller bearings
4 Double row deep groove ball bearings
5 Thrust ball bearings
6 Single row deep groove ball bearings
7 Single row angular contact ball bearings
8 Cylindrical roller thrust bearings
   
BK Drawn cup needle roller bearings with closed end
C CARB toroidal roller bearings
HK Drawn cup needle roller bearings with open ends
K Needle roller and cage thrust assemblies
N Cylindrical roller bearings
  A second and sometimes a third letter are used to identify the configuration of the flanges, e.g. NJ, NU, NUP; double or multi-row cylindrical roller bearing designations always start with NN.
NA Needle roller bearings with boundary dimensions to ISO 15
NK Needle roller bearings
QJ Four-point contact ball bearings
T Tapered roller bearings, a few metric sizes to ISO 355-1977
  Inch tapered roller bearings with dimensions to an ABMA series are designated according to a different system to ANSI-ABMA Standard 19 (see also under prefix K-)

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SKF-- Prefixes

Designations - Supplementary designations - Prefixes

Prefixes are used to identify components of a bearing and are usually then followed by the designation of the complete bearing, or to avoid confusion with other bearing designations. For example they are used in front of designations for tapered roller bearings according to a system described in ANSI/ABMA Standard 19 for (predominantly) inch bearings.

AR- Ball or roller and cage assembly
E2. SKF Energy Efficient bearings
GS Housing washer of a cylindrical roller thrust bearing
IR- Inner ring of radial bearing
K Cylindrical roller and cage thrust assembly
K- Inner ring with roller and cage assembly (cone) or outer ring (cup) of inch tapered roller bearing belonging to an ABMA standard series
L Separate inner or outer ring of a separable bearing
OR- Outer ring of radial bearing
R Inner or outer ring with roller (and cage) assembly of a separable bearing
W Stainless steel deep groove ball bearing
WF Deep groove ball bearing of stainless steel with external flange on outer ring
WS Shaft washer of a cylindrical roller thrust bearing
ZE Bearing with SensorMount feature

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SKF - Suffixes:

Suffixes are used to identify designs or variants which differ in some way from the original design, or which differ from the current standard design. The suffixes are divided into groups and when more than one special feature is to be identified; suffixes are provided in the order shown in the scheme in fig.

The most commonly used suffixes are listed in the following. Note that not all variants are available.

Suffixes A - B
A Deviating or modified internal design with same boundary dimensions. As a rule the significance of the letter is bound to the particular bearing or bearing series.
 
Examples: 4210 A Double row deep groove ball bearing without filling slots
  3320 A Double row angular contact ball bearing without filling slots
   
AC Single row angular contact ball bearing with a 25 contact angle
   
ACD Single row angular contact ball bearing, optimized internal design, 25 contact angle
   
ADA Wide snap ring grooves in the outer ring; a two-piece inner ring held together by a retaining ring
   
AS Needle roller bearing with lubrication hole(s) in the outer ring. A figure following the AS indicates the number of holes
   
ASR Needle roller bearing with annular groove and lubrication hole(s) in the outer ring. A figure following the ASR indicates the number of holes
   
Axx(x) A combined with a two or three-figure number identifies variants of the standard design which cannot be identified by generally applicable suffixes
   
B
1. Deviating or modified internal design with same boundary dimensions.
As a rule the significance of the letter is bound to the particular bearing series
 
Examples: 7210 B Single row angular contact ball bearing with a 40 contact angle
  32210 B Taper roller bearing with steep contact angle (steeper than 32210)
   
2. Taper roller bearing to ABMA standard with external flange on the outer ring
   
BE Single row angular contact ball bearing with a 40 contact angle and optimized internal design
   
BEJ Single row angular contact ball bearing with a 40 contact angle and optimized internal design, with ball centred pressed steel cage
   
BEM Single row angular contact ball bearing with a 40 contact angle and optimized internal design, with machined brass cage
   
BEP Single row angular contact ball bearing with a 40 contact angle and optimized internal design, with moulded cage of glass fibre reinforced polyamide 66
   
BEY Single row angular contact ball bearing with a 40 contact angle and optimized internal design, with ball centred pressed brass cage
   
Bxx(x) B combined with a two or three-figure number identifies variants of the standard design that cannot be identified by generally applicable suffixes
 
Example: B20 Reduced width tolerance

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Suffixes C
C
1. Deviating or modified internal design with same boundary dimensions. As a rule the significance of the letter is bound to the particular bearing series
 
Examples: 7210 C Single row angular contact ball bearing with 15 contact angle
  21306 C Spherical roller bearing with a flangeless inner ring, symmetrical rollers, loose guide ring and a pressed window-type steel cage
   
2. Y-bearing with cylindrical outside diameter, e.g. YET 205 C
   
CA
1. Spherical roller bearing of C design, but with retaining flanges on the inner ring and a machined cage
2. Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to- face will have an axial internal clearance smaller than Normal (CB) before mounting
   
CAC Spherical roller bearing of CA design but with enhanced roller guidance
   
CB 1. Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have a Normal axial internal clearance before mounting
  2. Controlled axial clearance of a double row angular contact ball bearing
   
CC
1. Spherical roller bearing of C design but with enhanced roller guidance
2. Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have an axial internal clearance larger than Normal (CB) before mounting
   
CD Single row angular contact ball bearing, optimized internal design, 15 contact angle
   
CLN Tapered roller bearing with tolerances corresponding to ISO tolerance class 6X
   
CL0 Inch tapered roller bearing with tolerances to class 0 according to ANSI-ABMA Standard 19.2:1994
   
CL00 Inch tapered roller bearing with tolerances to class 00 according to ANSI-ABMA Standard 19.2:1994
   
CL3 Inch tapered roller bearing with tolerances to class 3 according to ANSI-ABMA Standard 19.2:1994
   
CL7C Tapered roller bearing with special frictional behaviour and heightened running accuracy
   
CN Normal internal clearance, normally only used together with an additional letter that identifies a reduced or displaced clearance range
 
Examples: CNH Upper half of the Normal clearance range
  CNL Lower half of the Normal clearance range
  CNM Two middle quarters of the Normal clearance range
  CNP Upper half of the Normal and lower half of C3 clearance
  CNR Cylindrical roller bearings with Normal clearance range to DIN 620-4:1982
  The above letters H, L, M and P are also used together with the clearance classes C2, C3, C4 and C5, e.g. C2H
   
CV Full complement cylindrical roller bearing with modified internal design
   
CS Sheet steel reinforced contact seal of acrylonitrile-butadiene rubber (NBR) on one side of the bearing
   
2CS CS contact seal on both sides of the bearing
   
CS2 Sheet steel reinforced contact seal of fluoro rubber (FKM) on one side of the bearing
   
2CS2 CS2 contact seal on both sides of the bearing
   
CS5 Sheet steel reinforced contact seal of hydrogenated acrylonitrile-butadiene rubber (HNBR) on one side of the bearing
   
2CS5 CS5 contact seal on both sides of the bearing
   
C1 Bearing internal clearance smaller than C2
C2 Bearing internal clearance smaller than Normal
C3 Bearing internal clearance greater than Normal
C4 Bearing internal clearance greater than C3
C5 Bearing internal clearance greater than C4
   
C02 Reduced tolerance for running accuracy of inner ring of assembled bearing
   
C04 Reduced tolerance for running accuracy of outer ring of assembled bearing
   
C08 C02 + C04
   
C083 C02 + C04 + C3
   
C10 Reduced tolerance for the bore and outside diameters

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Suffixes D - F
D
1. Deviating or modified internal design with same boundary dimensions; as a rule the significance of the letter is bound to the particular bearing series
 
Examples: 
3310 D  Double row angular contact ball bearing with a two-piece inner ring
K 404517 D  Split needle roller and cage assembly (radial)
   
2. Inner ring with two roller and cage assemblies (double cone) or outer ring with two raceways (double cup) of double row tapered roller bearing to ABMA standard (normally inch-size)
   
DB Two single row deep groove ball bearings (1), single row angular contact ball bearings (2) or single row tapered roller bearings matched for mounting in a back-to-back arrangement. The letter(s) following the DB indicate the magnitude of the axial internal clearance or preload in the bearing pair before mounting.
 
A Light preload (2)
B Moderate preload (2)
C Heavy preload (2)
CA Axial internal clearance smaller than Normal (CB) (1, 2)
CB Normal axial internal clearance (1, 2)
CC Axial internal clearance larger than Normal (CB) (1, 2)
C Special axial internal clearance in μm
GA Light preload (1)
GB Moderate preload (1)
G Special preload in daN
   
DF Two single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings matched for mounting in a face-to-face arrangement; the letter(s) following the DF are explained under DB
   
DG Two single row angular contact ball bearings for universal pairing, i.e. paired for mounting in a back-to-back, face-to-face or tandem arrangement; supplementary designations for axial internal clearance and preload are explained under DB
   
DH Single direction thrust bearing with two housing washers
   
DR Two single row deep groove ball bearings or cylindrical roller bearings paired to achieve even radial load distribution
   
DS
1. Single direction thrust bearing with two shaft washers
2. Split radial needle roller and cage assembly
   
DT Two single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings matched for mounting in a tandem arrangement; for paired tapered roller bearings the design and arrangement of the intermediate rings between the inner and/or outer rings are identified by a two-figure number which follows immediately after DT
   
D8 Deep groove ball bearing of open design, also available as standard with shields or seals, but without seal recesses in the outer ring
   
E Deviating or modified internal design with same boundary dimensions; as a rule the significance of the letter is bound to the particular bearing series; usually indicates reinforced rolling element complement
  Example:
Single row angular contact ball bearing with a 40 contact angle and optimized internal design
   
EC Single row cylindrical roller bearing with an optimized internal design and with modified roller end/flange contact
   
ECA Spherical roller bearing of CA design but with reinforced rolling element complement
   
ECAC Spherical roller bearing of CAC design but with reinforced rolling element complement
   
Exx(x) E combined with a two or three-figure number identifies variants of the standard design which cannot be identified by generally applicable suffixes
   
F Machined steel or special cast iron cage, rolling element centred; different designs or material grades are identified by a figure following the F, e.g. F1
   
FA Machined steel or special cast iron cage; outer ring centred
   
FB Machined steel or special cast iron cage; inner ring centred
   
2F Y-bearing with plain flinger at both sides

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Suffixes G - K
G Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have a "Normal" axial clearance
   
G.. Grease filling. A second letter indicates the temperature range of the grease and a third letter identifies the actual grease. The significance of the second letter is as follows:
 
E Extreme pressure grease
F Food compatible grease
H, J High temperature grease, e.g. 20 to +130 C
L Low temperature grease, e.g. 50 to +80 C
M Medium temperature grease, e.g. 30 to +110 C
W, X Low/high temperature grease, e.g. 40 to +140 C
   
  A figure following the three-letter grease code indicates that the filling degree deviates from the standard: 1, 2 and 3 indicate smaller than standard, 4 to 9 a larger fill
   
 
Examples: GEA Extreme pressure grease, standard fill
  GLB2 Low temperature grease, 15 to 25% fill
   
GA Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have a light preload
   
GB Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have a moderate preload
   
GC Single row angular contact ball bearing for universal matching.
Two bearings arranged back-to-back or face-to-face will have a heavy preload
   
GJN Grease with a polyurea thickener of consistency 2 to the NLGI Scale for a temperature range 30 to +150 C (normal fill grade)
   
GXN Grease with a polyurea thickener of consistency 2 to the NLGI Scale for a temperature range 40 to +150 C (normal fill grade)
   
H
1. Pressed snap-type steel cage, hardened
2. Needle roller bearing without inner ring with reduced inside diameter (under rollers) tolerance; followed by tolerance limits in μ m, e.g. /H+20+27
   
HA Case-hardened bearing or bearing components. For closer identification HA is followed by one of the following figures:
 
0 Complete bearing
1 Outer and inner rings
2 Outer ring
3 Inner ring
4 Outer ring, inner ring and rolling elements
5 Rolling elements
6 Outer ring and rolling elements
7 Inner ring and rolling elements
   
HB Bainite-hardened bearing or bearing component. For closer identification HB is followed by one of the figures explained under HA
   
HC Bearing or bearing components of ceramic. For closer identification HC is followed by one of the figures explained under HA
   
HE Bearing or bearing component of vacuum remelted steel. For closer identification HE is followed by one of the figures explained under HA
   
HM Martensite-hardened bearing or bearing component. For closer identification HM is followed by one of the figures explained under HA
   
HT Grease fill for high temperatures (e.g. 20 to +130 C). HT or a two figure number following HT identifies the actual grease. Filling degrees other than standard are identified by a letter or letter/figure combination following HTxx:
 
A Filling degree less than standard
B Filling degree greater than standard
C Filling degree greater than 70%
F1 Filling degree less than standard
F7 Filling degree greater than standard
F9 Filling degree greater than 70%
Examples: HTB, HT22 or HT24B
   
HV Bearing or bearing component of hardenable stainless steel. For closer identification HV is followed by one of the figures explained under HA
   
IS Needle roller bearing with lubricating hole(s) in inner ring; a figure following IS identifies the number of holes
   
ISR Needle roller bearing with annular groove and lubricating hole(s) in inner ring; a figure following ISR identifies the number of holes
   
J Pressed steel cage, rolling element centred, unhardened; different designs are identified by a figure, e.g. J1
   
JHA Pressed steel cage, hardened, outer ring centred
   
JR Cage comprising of two flat washers of unhardened steel, riveted together
   
JW Pressed steel cage, unhardened, welded
   
K Tapered bore, taper 1:12
   
K30 Tapered bore, taper 1:30

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Suffixes L - N
L Machined light alloy cage; different designs or materials are identified by a figure, e.g. L1
   
LA Machined light alloy cage, outer ring centred
   
LB Machined light alloy cage, inner ring centred
   
LHT Grease fill for low and high temperatures (e.g. 40 to +140 C). A two-figure number following LHT identifies the actual grease. An additional letter or letter/figure combination as mentioned under "HT" identifies filling degrees other than standard. Examples: LHT23, LHT23C or LHT23F7
   
LO Bearing without preservative, but coated with low viscosity oil; the actual oil is identified by figures following the LO, e.g. LO10
   
LP Light alloy window-type cage, with punched or reamed pockets, inner or outer ring centred
   
LPS As LP but with lubrication grooves in the guiding surfaces
   
LS Contact seal of acrylonitrile-butadiene rubber (NBR) or polyurethane (AU) with or without sheet steel reinforcement, on one side of the bearing
   
2LS LS contact seal on both sides of the bearing
   
LT Grease fill for low temperatures (e.g. 50 to +80 C). identifies the actual grease. An additional letter or letter/figure combination as mentioned under "HT" identifies filling degrees other than standard. Examples: LT, LT10 or LTF1
   
L4B Bearing rings and rolling elements with special surface coating
   
L5B Rolling elements with special surface coating
   
L5DA NoWear bearing with coated rolling elements
   
L7DA NoWear bearing with coated rolling elements and inner ring raceway(s)
   
M Machined brass cage, rolling element centred; different designs or material grades are identified by a figure or a letter , e.g. M2, MC
   
MA Machined brass cage, outer ring centred
   
MAS As MA but with lubrication grooves in the guiding surfaces
   
MB Machined brass cage, inner ring centred
   
MBS As MB but with lubrication grooves in the guiding surfaces
   
ML Machined one-piece window-type brass cage, inner or outer ring centred
   
MO Bearing without preservative, but coated with medium viscosity oil; the actual oil is identified by figures following the MO, e.g. MO10
   
MP Machined one-piece window-type brass cage, with punched or reamed pockets, inner or outer ring centred
   
MPS As MP but with lubrication grooves in the guiding surfaces
   
MR Machined one-piece window-type brass cage, rolling element centred
   
MT Grease fill for medium temperatures (e.g. 30 to +110 C). A two-figure number following MT identifies the actual grease. An additional letter or letter/figure combination as mentioned under "HT" identifies filling degrees other than standard. Examples: MT33 or MT37F9
   
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 or housing washer
   
N2 Two locating slots (notches) 180 apart in one outer ring side face or housing washer

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Suffixes P - S
P Injection moulded cage of glass fibre reinforced polyamide 66, rolling element centred
   
PA9 Dimensional and running accuracy to ABMA tolerance class ABEC 9 (better than P4)
   
PA9A As PA9
   
PA9B As PA9 but running accuracy better than ABMA tolerance class ABEC 9
   
PH Injection moulded cage of glass fibre reinforced polyetheretherketone (PEEK), rolling element centred
   
PHA Injection moulded cage of glass fibre reinforced polyetheretherketone (PEEK), outer ring centred
   
PHAS Injection moulded cage of glass fibre reinforced polyetheretherketone (PEEK), outer ring centred, lubrication grooves in the guiding surfaces
   
PP Acrylonitrile butadiene rubber contact seals at both sides of track runner bearing
   
PPA Axial slide rings of polyamide 66 at both sides of track runner bearing and improved profile of the runner surface
   
P4 Dimensional and running accuracy to ISO tolerance class 4
   
P4A Dimensional accuracy to ISO tolerance class 4 and running accuracy to ABMA tolerance class ABEC 9
   
P5 Dimensional and running accuracy to ISO tolerance class 5
   
P6 Dimensional and running accuracy to ISO tolerance class 6
   
P43 P4 + C3
   
P52 P5 + C2
   
P62 P6 + C2
   
P63 P6 + C3
   
Q Optimized internal geometry and surface finish (tapered roller bearing)
   
QBC Set of four matched deep groove or angular contact ball bearings; two bearings arranged back-to-back with the other two arranged outside the back-to-back pair in tandem with them, i.e. two tandem pairs arranged back-to-back
   
QBT Set of four matched deep groove or angular contact ball bearings; two bearings arranged back-to-back and the other two in tandem at one side of the back-to-back pair, i.e. three bearings in tandem and back-to-back with fourth bearing
   
QFC Set of four matched deep groove or angular contact ball bearings; as /QBC but with central pair arranged face-to-face, i.e. two tandem pairs arranged face-to-face
   
QFT Set of four matched deep groove or angular contact ball bearings; as /QBT but with face-to-face pair at one side, i.e. three bearings in tandem and face-to-face with fourth bearing
   
QR Set of four single row deep groove ball or cylindrical roller bearing matched for equal distribution of radial load
   
QT Set of four matched deep groove or angular contact ball bearings arranged in tandem
   
R
1. Integral external outer ring flange
2. Crowned runner surface (track runner bearing)
   
RF Rubberised flinger (pressed steel flinger with vulcanised rubber sealing lip) at one side of Y-bearing
   
2RF RF flinger at both sides of Y-bearing
   
RS Contact seal of acrylonitrile-butadiene rubber (NRB) with or without sheet steel reinforcement on one side of the bearing
   
2RS RS contact seal on both sides of the bearing
   
RS1 Sheet steel reinforced contact seal of acrylonitrile-butadiene rubber (NBR) on one side of the bearing
   
2RS1 RS1 contact seal on both sides of the bearing
   
RS1Z Sheet steel reinforced contact seal of acrylonitrile-butadiene rubber (NBR) on one side and one shield on the other side of the bearing
   
RS2 Sheet steel reinforced contact seal of fluoro rubber (FKM) on one side of the bearing
   
2RS2 RS2 contact seal on both sides of the bearing
   
RSH Sheet steel reinforced contact seal of acrylonitrile-butadiene rubber (NBR) on one side of the bearing
   
2RSH RSH contact seal on both sides of the bearing
   
RSL Sheet steel reinforced low-friction contact seal of acrylonitrile-butadiene rubber (NBR) on one side of the bearing
   
2RSL RSL low-friction contact seal on both sides of the bearing
   
RZ Sheet steel reinforced low-friction seal of acrylonitrile-butadiene rubber (NBR)
   
2RZ RZ low-friction seal on both sides of the bearing
   
SM Needle roller bearing with grease. The two-figure number following identifies the actual grease
   
SORT Tolerance grade of needle rollers of a needle roller and cage assembly; the figures following give the actual limits in μm, e.g. /SORT-2-4
   
SP Special tolerance class for machine tool spindle bearings; dimensional accuracy approximately to ISO tolerance class 5 and running accuracy approximately to ISO tolerance class 4
   
S0 Bearing rings or washers dimensionally stabilized for use at operating temperatures up to +150 C
   
S1 Bearing rings or washers dimensionally stabilized for use at operating temperatures up to +200 C
   
S2 Bearing rings or washers dimensionally stabilized for use at operating temperatures up to +250 C
   
S3 Bearing rings or washers dimensionally stabilized for use at operating temperatures up to +300 C
   
S4 Bearing rings or washers dimensionally stabilized for use at operating temperatures up to +350 C

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Suffixes T - Z
T Window-type cage of fabric reinforced phenolic resin, rolling element centred
   
TA Window-type cage of fabric reinforced phenolic resin, outer ring centred
   
TB Window-type cage of fabric reinforced phenolic resin, inner ring centred
   
TBT Set of three matched single row deep groove or angular contact ball bearings; two bearings arranged back-to-back and the third in tandem
   
TFT Set of three matched single row deep groove or angular contact ball bearings; two bearings arranged face-to-face and the third in tandem
   
TH Snap-type cage of fabric reinforced phenolic resin, rolling element centred
   
TN Injection moulded cage of polyamide 66, rolling element centred; for needle roller bearings, the cage is glass fibre reinforced
   
TNH Injection moulded cage of glass fibre reinforced polyetheretherketone (PEEK), rolling element centred
   
TNHA Injection moulded cage of glass fibre reinforced polyetheretherketone (PEEK), outer ring centred
   
TN9 Injection moulded cage of glass fibre reinforced polyamide 66, rolling element centred
   
TR Three single row deep groove ball or cylindrical roller bearings, matched to give equal distribution of radial load
   
TT Set of three matched single row deep groove or angular contact ball bearings arranged in tandem
   
U
1. U combined with a one-figure number identifies a taper roller bearing, cone or cup, with reduced width tolerance. Examples:
U2: Width tolerance 0+0,05/0 mm
U4: Width tolerance 0+0,10/0 mm
2. Y-bearing without locking collar
3. Y-bearing locking collar without grub screw
   
UP Special tolerance class for machine tool spindle bearings; dimensional accuracy approximately to ISO tolerance class 4 and running accuracy better than ISO class 4
   
V Full complement bearing (without cage)
   
V... V combined with a second letter, identifies a variant group, and followed by a three- or four-figure number denotes variants not covered by "standard" designation suffixes. Examples:
VA Application oriented variants
V B Boundary dimension deviations
V E External or internal deviations
V L Coatings
V Q Quality and tolerances other than standard
V S Clearance and preload
V T Lubrication
V U Miscellaneous applications
   
VA201 Bearing for high-temperature applications (e.g. kiln trucks)
   
VA208 Bearing for high-temperature applications
   
VA216 Bearing for high-temperature applications
   
VA228 Bearing for high-temperature applications
   
VA301 Bearing for traction motors
VA305 Bearing for traction motors + special inspection routines
   
VA3091 Bearing for traction motors with aluminium oxide coated outside surface of outer ring for electrical resistance up to 1 000 V DC
   
VA320 Bearing for railway axleboxes according to EN 12080:1998
   
VA350 Bearing for railway axleboxes
VA380 Bearing for railway axleboxes according to EN 12080:1998
   
VA405 Bearing for vibratory applications
   
VA406 Bearing for vibratory applications with special PTFE bore coating
   
VA701 Bearing for paper machines
   
VA820 Bearing for railway axleboxes according to EN 12080:1998
   
VC025 Bearing with specially debris-heat-treated components for applications in heavily contaminated environments
VE240 CARB bearing modified for greater axial displacement
   
VE447 Shaft washer with three equally spaced threaded holes in one side face to accommodate hoisting tackle
   
VE552 Outer ring with three equally spaced threaded holes in one side face to accommodate hoisting tackle
   
VE553 Outer ring with three equally spaced threaded holes in both side faces to accommodate hoisting tackle
   
VE632 Housing washer with three equally spaced threaded holes in one side face to accommodate hoisting tackle
   
VG114 Surface-hardened pressed steel cage
   
   
VH Full complement cylindrical roller bearing with self-retaining roller set
   
VGS Inner ring raceway of cylindrical and needle roller bearings pre-ground only, for cylindrical roller bearings replaced by /VU001
   
VL0241 Aluminium oxide coated outside surface of outer ring for electrical resistance up to 1 000 V DC
   
VL0271 Aluminium oxide coated outside surface of inner ring for electrical resistance up to 1 000 V DC
   
VQ015 Inner ring with crowned raceway for increased permissible misalignment
VQ424 Running accuracy better than C08
   
VT143 Extreme pressure grease with a lithium thickener of consistency 2 to the NLGI Scale for a temperature range 20 to +110 C (normal fill grade)
   
VT378 Food grade grease with an aluminium thickener of consistency 2 to the NLGI Scale for a temperature range 25 to +120 C (normal fill grade)
   
   
VU001 Preground raceways
   
   
W Without annular groove and lubrication holes in outer ring
   
WT Grease fill for low as well as high temperatures (e.g. 40 to +160 C). WT or a two-figure number following WT identifies the actual grease. An additional letter or letter/ figure combination as mentioned under HT identifies filling degrees other than standard.
Examples: WT or WTF1
   
W20 Three lubrication holes in the outer ring
   
W26 Six lubrication holes in the inner ring
   
W33 Annular groove and three lubrication holes in the outer ring
   
W33X Annular groove and six lubrication holes in the outer ring
   
W513 Six lubrication holes in the inner ring and annular groove and three lubrication holes in the outer ring
   
W518 Six lubrication holes in inner ring and three lubrication holes in outer ring
   
W64 Solid Oil filling
   
W77 Plugged W33 lubrication holes
   
X
1. Boundary dimensions altered to conform to ISO standards
2. Cylindrical runner surface (track runner bearings)
   
Y Pressed brass cage, rolling element centred; different designs or material grades are identified by a figure following the Y, e.g. Y1
   
Z
1. Combined needle roller bearings with cover
2. Shield of pressed sheet steel on one side of the bearing
   
2Z Z-shield on both sides of the bearing
   
ZW Double row needle roller and cage assembly

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