SKF Cylindrical roller bearings are available in a wide range of designs, series, variants and sizes. The designation of SKF cylindrical roller bearings follow SKF bearing nomenclature. The complete SKF cylindrical roller bearing designation may consist of a basic designation with or without one or more supplimentary prefixes and suffixes.
| Prefix | Basic designation | SKF bearing suffixes | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prefix | Bear Type | Series | Bore code | Internal design | External design | Cage design | Materials, heat treatment | Tolerance, clearance, preload, quiet running | Bearing sets, matched bearings | Stabilization | Lubrication | Other variants |
SKF single row cylindrical roller bearings nomenclature
Example: NU 205 ECP
Prefixes
L
Separate inner or outer ring of a separable bearing
R
Inner or outer ring with roller and cage assembly of a separable bearing
Basic designation
Please refer to SKF bearing designation and SKF single row cylindrical roller bearings for more details.
CRL
Inch bearing
CRM
Inch bearing
HJ
Angle ring
Suffixes
Internal design
A
Deviating or modified internal design
EC
Optimized internal design incorporating more and/or larger rollers and with modified roller end / flange contact
External design
k
Tapered bore, taper 1:12
N
Snap ring groove in the outer ring
NR
Snap ring groove in the outer ring, with associated snap ring
N1
One locating slot (notch) in one outer ring side face
N2
Two locating slots (notches) in one outer ring side face, 180° apart
Cage design
FR
Pin-type steel cage, pierced rollers
J
Stamped steel cage, roller centred
L
Machined light alloy cage, roller centred
LA
Machined light alloy cage, outer ring centred
LB
Machined light alloy cage, inner ring centred
LL
Machined light alloy cage, window-type, inner or outer ring centred (depending on bearing design)
M
Machined brass cage, roller centred
MA(S)
Machined brass cage, outer ring centred. The S indicates a lubrication groove in the guiding surface.
MB
Machined brass cage, inner ring centred
ML
Machined brass cage, window-type, inner or outer ring centred (depending on bearing design)
MP
Machined brass cage, window-type, inner or outer ring centred (depending on bearing size)
MR
Machined brass cage, window-type, roller centred
P
Glass fibre reinforced PA66 cage, roller centred
PA
Glass fibre reinforced PA66 cage, outer ring centred
PH
Glass fibre reinforced PEEK cage, roller centred
PHA
Glass fibre reinforced PEEK cage, outer ring centred
Materials, heat treatment
HA1
Case-hardened inner and outer rings
HA2
Case-hardened outer ring
HA3
Case-hardened inner ring
HB1
Bainite-hardened inner and outer rings
HB3
Bainite-hardened inner ring
HN1
Inner and outer rings with special surface heat treatment
Accuracy, clearance, preload, quiet running
CN
Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range
C2
Radial internal clearance smaller than Normal
C3
Radial internal clearance greater than Normal
C4
Radial internal clearance greater than C3
Bearing sets, matched bearings
DR
Set of two matched bearings
TR
Set of three matched bearings
QR
Set of four matched bearings
Stabilization
S1
Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390 °F)
S2
Bearing rings heat stabilized for operating temperatures ≤ 250 °C (480 °F)
Lubrication
W33
Annular groove and three lubrication holes in the outer ring
SKF double row cylindrical roller bearings nomenclature
SKF double row cylindrical roller bearings are available in several designs:
- NNU design bearings
- NN design bearings
- NNUP design bearings
Example: NNU 4156 M/W33
Basic designation
Please refer to SKF bearing designation
Suffixes
Internal design
A , B , C
Deviating or modified internal design
External design
G
Helical groove in inner ring bore
K
Tapered bore, taper 1:12
K30
Tapered bore, taper 1:30
Cage design
F
Machined steel cage, roller centred
M
Machined brass cage, roller centred
Materials, heat treatment
HA1
Case-hardened inner and outer rings
HA4
Case-hardened inner and outer rings and rollers
HA5
Case-hardened rollers
HB1
Bainite-hardened inner and outer rings
Accuracy, clearance, preload, quiet running
CN
Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range
C2
Radial internal clearance smaller than Normal
C3
Radial internal clearance greater than Normal
C4
Radial internal clearance greater than C3
Bearing sets, matched bearings
DR
Set of two matched bearings
TR
Set of three matched bearings
QR
Set of four matched bearings
Stabilization
S1
Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390°F)
S2
Bearing rings heat stabilized for operating temperatures ≤ 250 °C (480°F)
Lubrication
W33(X)
Annular groove and lubrication holes in the outer ring
W20
Lubrication holes in the outer ring
SKF four-row cylindrical roller bearings nomenclature
SKF four-row cylindrical roller bearings are available in several designs:
- With a cylindrical or tapered bore
- Open or sealed
For SKF four-row cylindrical roller bearings nomenclature, Drawing numbers are commonly used as the basic designation. The basic designation may be supplemented with prefixes and suffixes. The drawing number itself does not provide any information about the bearing design or features.
Basic designation
...
6-digit drawing number, no information about bearing design
BC2B ...
Drawing number beginning with BC2B: two matched double row cylindrical roller bearings
BC4...
Drawing number beginning with BC4: four-row cylindrical roller bearing
NNUD
Four-row cylindrical roller bearing based on two NNU design double row bearings
Suffixes
Internal design
A , B , C , D , E
Deviating or modified internal design. Combinations of these letters are also used, e.g. DC. The actual modification is specific to the individual bearing and is given on the drawing.
EC
Optimized internal design incorporating more and/or larger rollers and with modified roller end / flange contact
External design
G
Helical groove in inner ring bore
K
Tapered bore, taper 1:12
K30
Tapered bore, taper 1:30
Cage design
F
Machined steel cage, roller centred
FA
Machined steel cage, outer ring centred
M
Machined brass cage, roller centred
MA(S)
Machined brass cage, outer ring centred. The S indicates a lubrication groove in the guiding surface
Materials, heat treatment
HA1
Case-hardened inner and outer rings
HA2
Case-hardened outer ring
HA3
Case-hardened inner ring
HA4
Case-hardened inner and outer rings and rollers
HA5
Case-hardened rollers
HA6
Case-hardened outer ring(s) and rollers
HA7
Case-hardened inner ring(s) and rollers
HB1
Bainite-hardened inner and outer rings
HB2
Bainite-hardened outer ring(s)
HB3
Bainite-hardened inner ring(s)
Accuracy, clearance, preload, quiet running
CN
Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range
C2
Radial internal clearance smaller than Normal
C3
Radial internal clearance greater than Normal
C4
Radial internal clearance greater than C3
Stabilization
S1
Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390°F)
S2
Bearing rings heat stabilized for operating temperatures ≤ 250 °C (480°F)
Lubrication
W33(X)
Annular groove and lubrication holes in the outer ring
W20
Lubrication holes in the outer ring
SKF single row full complement cylindrical roller bearings nomenclature
The SKF standard assortment of single row full complement cylindrical roller bearings provided here includes NCF and NJG design bearings.
The designations of SKF single row full complement cylindrical roller bearings follow SKF bearing designation system.
Example: NCF 3004 CV
Suffixes
Internal design
CV
Modified internal design, full complement roller set
Cage design
V
Full complement of rollers (no cage)
VH
Full complement of rollers (no cage), self-retaining
Materials, heat treatment
HA1
Case-hardened inner and outer rings
HB1
Bainite-hardened inner and outer rings
L4B
Bearing rings and rollers black oxidized
Accuracy, clearance, preload, quiet running
CN
Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range
C2
Radial internal clearance smaller than Normal
C3
Radial internal clearance greater than Normal
C4
Radial internal clearance greater than C3
Bearing sets, matched bearings
DR
Set of two matched bearings
TR
Set of three matched bearings
QR
Set of four matched bearings
SKF double row full complement cylindrical roller bearings nomenclature
SKF double row full complement cylindrical roller bearings include:
- NNCL design
- NNCF design
- NNC design
- NNF design
Example: NNF5008ADB-2LSV
Suffixes
Internal design
CV
Modified internal design, full complement roller set
External design
ADA
Modified internal design and standard PUR seal (for NNF 50 series)
ADB
Modified internal design and seal (for NNF 50 series)
B
Improved H-ECOPUR seal
DA
Modified internal design and standard PUR seal (for 3194.. series)
-2LS
Contact seal on both sides
Cage design
V
Full complement of rollers (no cage)
Materials, heat treatment
HB1
Bainite-hardened inner and outer rings
L4B
Bearing rings and rollers black oxidized
Accuracy, clearance, preload, quiet running
CN
Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range
C2
Radial internal clearance smaller than Normal
C3
Radial internal clearance greater than Normal
C4
Radial internal clearance greater than C3
Bearing sets, matched bearings
DR
Set of two matched bearings
TR
Set of three matched bearings
QR
Set of four matched bearings