Supplementary code Suffix meaning of SKF bearing
The suffix of SKF bearing designation （types）is used to indicate a variant that have different structures and/or other characteristics from the basic design. When it is necessary to express more than one bearing characteristic, the suffix is regularly divided into several groups.
A: The internal design has been improved or slightly changed. The dimensions are the same. Usually have different meanings for different types or series of SKF bearings. For example: 4210 A: indicates a double- row deep groove ball bearing without a filling ball notch; 3220 A indicates a double row angular contact ball bearing with a contact angle of 30°.
AC: Single row angular contact ball bearing with a contact angle of 25°
ADA: The stop groove on the outer ring has been improved, and the split inner ring is fixed by a fixed ring.
B: An improved or slightly changed internal design, the same external dimensions, usually has different meanings for different types or series of SKF bearings. For example: 7224 B represents a single row angular contact ball bearing with a contact angle of 40°; 32210 B represents a tapered roller bearing with larger contact angles.
Bxx(x): B is combined with a two-digit or three-digit number to indicate some variants without a suitable suffix.
For example: B20: narrowed width tolerance
C: An bearing has been improved or slightly altered interior design，but boundary dimensions are the same. It usually has different meanings for different types or series of bearings. For example: 21306 C stands for spherical roller bearings, with two window-type stamped steel plate cages, inner ring without ribs and with a guide ring guided by the inner ring
CA: 1, C-type of spherical roller bearing, with fork-shaped machined brass cage, ribs on both sides of the inner ring and a guide ring guided by the inner ring; 2, universally matched bearings, when its configuration is in back-to-back or face-to-face, the axial clearance is smaller than the normal group (CB)
CAC: CA type of spherical roller bearing, the guide of the roller has been improved.
CB: 1. universally matched bearings, when its configuration is in back-to-back or face-to-face configuration, the axial clearance is the ordinary group; 2. Double row angular contact ball bearings: it is designed with specific axial clearance.
CC: 1, C- type of spherical roller bearing, the roller guide has been improved; 2, the universal matching bearing, in the back-to-back or face-to-face configuration, the axial clearance is greater than that of the ordinary group (CB)
CLN: tapered roller bearings, tolerance zone with reduced ring width and total width in accordance with ISO tolerance class 6X
CL0: Accuracy complies with ANSI/ABMA 19.2:1994 standard tolerance class 0, used for inch tapered roller bearings
CL00: Accuracy meets ANSI/ABMA 19.2:1994 standard tolerance class 00, used for inch tapered roller bearings
CL3: Accuracy conforms to ANSI/ABMA 19.2:1994 standard tolerance class 3, used for inch tapered roller bearings
CL7C: used for tapered roller bearings, with special friction characteristics and higher rotation accuracy
CN: Normal group radial clearance; usually only used in combination with the following letters to indicate a narrow or offset clearance range
CNH: narrowed clearance range, equivalent to the upper half of the normal group clearance range
CNM: Narrowed clearance range, equivalent to half of the normal group clearance range
CNL: narrowed clearance range, equivalent to the lower half of the normal group clearance range
CNP: Offset clearance range, equivalent to the composition of the upper half of the normal group clearance range and the lower half of the C3 clearance range
CNR: Cylindrical roller bearings with normal group clearance in accordance with DIN 620-4: 1982
The above letters H, M, L and P are also applicable to the following clearance groups to form corresponding meanings: C2, C3, C4 and C5, such as C2H
CV: Improved internal design, full complements cylindrical roller bearings
CS: Nitrile rubber (NBR) contact seal ring with steel frame on one side of the bearing
CS2: A fluorine rubber (FPM) contact seal with a steel frame in the bearing
CS5: Hydrogenated nitrile rubber (HNBR) contact seal ring with steel frame on one side of the bearing
2CS: Nitrile rubber (NBR) contact seal ring with steel frame on both sides of the bearing
2CS2: Fluorine rubber (FPM) contact seal ring with steel frame on both sides of the bearing
2CS5: Hydrogenated cyanide rubber (HNBR) contact seal ring with steel frame on both sides of the bearing
C1: Radial clearance is less than C2
C2: Radial clearance is smaller than normal group (CN)
C3: Radial clearance is greater than the normal group (CN)
C4: Radial clearance is greater than C3
C5: Radial clearance is greater than C4
C02: Narrowed tolerance of inner ring rotation accuracy
C04: Narrowed tolerance of outer ring rotation accuracy
C08: C02+C04
C083: C02+C04+C3
C10: Narrowed tolerance of inner diameter and outer diameter
D: The internal design has been improved or slightly changed, and the external dimensions are the same. It usually has different meanings for different types or series of bearings. For example: 3310 D means double row angular contact ball bearing with split inner ring
DA: The improved stop groove on the outer ring and the split inner ring is fixed by a fixed ring
DB: Two (1) single row deep groove ball bearings, (2) single row angular contact ball bearings or (3) single row tapered roller bearings paired assembled by back to back. The letter following DB indicates the size of the axial clearance or axial preload of the paired bearing before installation.
A: Light preload (2)
B: Medium preload (2)
C: Heavy preload (2)
CA: small axial clearance (1, 2)
CB: Ordinary axial clearance (1, 2)
CC: Large axial clearance (1, 2)
C: Special axial clearance, plus um as the unit number to express (3)
GA: Light preload (1)
GB: Medium preload (1)
G: Special preload, plus um as the unit number to express (3)
For pair matched tapered roller bearings, there may be a two-digit number between DB and C or G to indicate the design and configuration of the spacer ring, such as 330224 J2 / DB31C250
DF: Two single row deep groove ball bearings single row angular contact ball bearings or single row tapered roller bearings that are paired face to face. The following letters of DF have the same meaning as that of DB.
DT: Two single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings paired in series. Tandem matching installation; for a pair of tapered roller bearings, there may be a two-digit number after DT to indicate the design and configuration of the spacer
E: The internal design has been improved or slightly changed, and the external dimensions are the same. It usually has different meanings for different types or series of bearings. For example: 7212 BE means optimized internal design and single row angular contact ball bearing with a contact angle of 40°
EC: Single row cylindrical roller bearing, optimized internal design, equipped with more and/or larger rollers, improved contact between the roller end face and the rib
ECA: CA type spherical roller bearing with enhanced roller set
ECAC: CAC type spherical roller bearing with enhanced roller set
F: Machined steel or special cast iron retention, rolling element guide, there may be a number after F, indicating different designs or materials, such as F1
FA: Machined steel or special cast iron cage, outer ring guide
FB: Machined steel or special cast iron cage, inner ring guide
G: Universally matched single row angular contact ball bearings, two bearingspaired back-to-back or face-to-face, and have a certain axial clearance before installation
G..: Used to describe the grease used in the bearing, the second letter indicates the operating temperature range of the grease, and the third letter indicates a certain actual grease.
The meaning of the second letter is as follows:
E: Extreme pressure grease
F: Food compatible grease
H, J: high temperature grease, -20 to +130°C
L: low temperature grease, -50 to +80°C
M: Medium temperature grease, -30 to +110°C
W, X low/high temperature grease, -40 to +140°C
The digits after the three-letter grease code indicate the amount of grease filling that is different from the standard: 1, 2, and 3 indicate that the filling amount is less than the standard, and 4 to 9 indicate that the filling amount is more than the standard. For example: GEA means extreme pressure grease, standard filling amount; GLB2 means low temperature grease, filling amount is 15% to 25% of the free space in the bearing
GA: Universally matched bearings, with light preloaded in back-to-back or face-to-face configuration
GB: Universally matched bearings, with medium preloaded in back-to-back or face-to-face configuration
GC: Universally matched bearings, with heavy preloaded in back-to-back or face-to-face configuration
GJN: Polyurea soap grease, NLGI consistency 2, working temperature range at -30 to +150°C
H: Hardened clamp type of stamping steel cage
HA: Surface hardened bearing or bearing component, the number following HA indicates the specific part
0: complete set of bearings
1: Inner ring and outer ring
2: Outer ring
3: inner circle
4: Inner ring, outer ring and rolling elements
5: Rolling body
6: Outer ring and rolling elements
7: Inner ring and rolling elements
HB: Bainite hardened bearing or bearing component, the number after HB indicates the specific part, and the part represented by the number is the same as that of HA
HC: Bearings or bearing parts made of ceramic materials, the number following HC indicates the specific part, and the part represented by the number is the same as that of HA
HE: Bearings or bearing parts made of vacuum remelted steel, the number following HE indicates the specific part, and the part represented by the number is the same as that of HA
HM: Martensite hardened bearing or bearing component, the number following HM indicates the specific part, and the part represented by the number is the same as that of HA
HN: bearing or bearing component with special surface treatment, the number following HN indicates the specific part, and the part represented by the number is the same as HA
HT: Used to describe the high temperature grease used in the bearing (operating temperature range from -20 to +130°C). Different from the specified standard grease but other greases in this temperature range, add a two-digit number following HT to indicate. The filling amount is different from the standard; it is expressed by a letter or a combination of letters and numbers after HTxx:
A: Less than the standard filling amount
B: greater than the standard filling amount
C: The filling amount is greater than 70% of the free space in the bearing
F1: Less than the standard filling amount
F7: greater than the standard filling amount
F9: Filling more than 70% of the free space in the bearing
For example: HTB, HT22 or HT24B
HV: Hardenable stainless steel bearings or bearing parts, the number following HV indicates the specific part, and the part represented by the number is the same as HA
J: Stamping steel cage, rolling element guide, not hardened, and then there may be a number to indicate a different design, such as J1
JR: The cage is two flat steel plates connected by rivets, without hardening
K: Conical bore, taper 1:12
K30: Conical bore, taper 1:30
LHT: Used to describe the high and low temperature (wide temperature) grease used in the bearing (operating temperature range from -40 to +140°C). A two-digit number following LHT indicates some kind of actual grease. The filling amount that is different from the standard is expressed by a letter or a combination of letters and numbers after LT. The code used is the same as that of HT. For example: LHT23, LHT23C or LHT23F7
LS: Contact seal with (or without) steel frame on one side of the bearing
2LS: Contact seal with (or without) steel frame on both sides of the bearing
LT: Used to describe the low temperature grease used in the bearing (operating temperature range -50 to +80°C). Different from the specified standard grease, other greases in this temperature range are indicated by adding a two-digit number after LT. The filling amount is different from the standard, it is expressed by a letter or a combination of letters and numbers after LT, and the code is used the same as that of HT. For example: LT, LT10 or LTF1
L4B: Bearing rings and rolling elements with special surface coating
L5B: Rolling elements with special surface coating
L5DA: NoWear -- non wear bearings, with ceramic-coated rolling elements
L7DA: NoWear -- non wear bearings, with ceramic-coated rolling elements and inner ring raceways
M: Machined brass cage, guided by rolling elements. Different designs and materials add digital logos after M, such as M2
MA: Machined brass cage, outer ring guide
MB: Inside-cut brass cage, inner ring guide
ML: Integral window-type brass cage, inner or outer ring guide
MP: Integral window-type brass cage, the opening is formed by milling, reaming or drilling, and the inner ring or outer ring is guided
MR: Integral window-type brass cage, rolling element guidance
MT: Used to describe the medium temperature grease used in the bearing (operating temperature range from -30 to +110°C). With other greases in the specified range, add a two-digit number following MT to indicate. The filling amount is different from the standard, it is expressed by a letter or a combination of letters and numbers after MT, and the code is used the same as HT. For example: MT33, MT37F9 or MT47
N: Outer ring with stop groove
NR: Outer ring with stop groove and stop ring
N1: A positioning groove on the outer ring
N2: The outer ring has two positioning grooves forming 180° each other
P: Injection glass fiber reinforced nylon 6,6 cage, rolling element guide
PH: injection molded polyether ether ketone (PEEK) cage, rolling element guide
PHA: injection molded polyether ether ketone (PEEK) cage, outer ring guide
P4: Dimensional accuracy and rotation accuracy comply with ISO tolerance level 4
P5: Dimensional accuracy and rotation accuracy comply with ISO tolerance level 5
P6: Dimensional accuracy and rotation accuracy comply with ISO tolerance level 6
P62: P6+C2
P63: P6+C3
Q: For tapered roller bearings, optimized geometric contact and surface treatment
R: 1, outer ring with flange; 2, curved roller surface (roller bearing)
RS: Nitrile butadiene rubber (NBR) contact seal with (or without) steel frame on one side of the bearing
RS1: Nitrile rubber (NBR) contact seal with steel frame on one side of the bearing
RS1Z: One side of the bearing has a steel framed nitrile rubber (NBR) contact seal, and the other side has a stamped steel dust cover
RS2: Fluorine rubber (FPM) contact seal with steel frame on one side of the bearing
RSH: Nitrile butadiene rubber (NBR) contact seal with steel frame on one side of the bearing
RSL: Nitrile butadiene rubber (NBR) low friction seal with steel frame on one side of the bearing
RZ: Nitrile butadiene rubber (NBR) low friction seal with steel frame on one side of the bearing
2RS: Nitrile butadiene rubber (NBR) contact seal with (or without) steel frame on both sides of the bearing
2RS1: Nitrile butadiene rubber (NBR) contact seal with steel frame on both sides of the bearing
2RS2: Nitrile rubber (FPM) contact seal with steel frame on both sides of the bearing
2RSH: Nitrile butadiene rubber (NBR) contact seal with steel frame on both sides of the bearing
2RSL: Nitrile butadiene rubber (NBR) low friction seal with steel frame on both sides of the bearing
2RZ: Nitrile butadiene rubber (NBR) low-friction seals with steel skeleton on both sides of the bearing
S0: Special heat treatment, the bearing ring maintains dimensional stability below +150°C
S1: Special heat treatment, the bearing ring maintains dimensional stability below +200°C
S2: Special heat treatment, the bearing ring maintains dimensional stability below +250°C
S3: Special heat treatment, the bearing ring maintains dimensional stability below +300°C
S4: Special heat treatment, the bearing ring maintains dimensional stability below +350°C
T: Machined fiber-reinforced phenolic resin cage, guided by rolling elements
TB: Window type fiber reinforced phenolic resin cage, inner ring guide
TH: Clamp type fiber reinforced phenolic resin cage, rolling element guide
TN: injection molded nylon 6,6 cage, rolling element guide
TNH: injection molded polyether ether ketone (PEEK) cage, rolling element guide
TNHA: injection molded glass fiber reinforced nylon 6,6 cage, outer ring guide
TN9: injection glass fiber reinforced nylon 66 cage, and rolling element guide
U: Add a number after U to indicate the narrowed width tolerance zone, used for tapered roller bearings, or its inner or outer ring, for example: U2: width tolerance +0.05/0mm; U4: width tolerance +0.10/ 0mm
V: Full roller bearing (without cage)
V...: Adding a letter after V is used to indicate a characteristic that is different from that of standard bearings, and adding a three-digit or four-digit number after V indicates its specific meaning. For example: VA: indicates a specific application; VB: difference in dimensions; VE: external or internal difference; VL: coating; VQ: quality and tolerance different from the standard; VS: clearance and preload; VT: Lubrication; VU: Various other characteristics
VA201: Bearings for high temperature applications (such as kiln cars)
VA208: Bearings for high temperature applications
VA228: Bearings for high temperature applications
VA301: Bearings for railway traction motors
VA305: VA301+ special inspection process
VA3091: VA301+VL0241
VA350: Bearings for railway axle boxes
VA405: Bearings for Vibration Machinery
VA406: Bearing for vibration machinery, inner bore with polytetrafluoroethylene (PTFE) coating
VA820: Railway axlebox bearings complying with EN 12080:1998
VC025: bearing parts heat-treated with chips, used in severely polluted working environments
VE240: CARB bearing that allows greater axial displacement
VE447: One side of the shaft ring is provided with three evenly distributed threads holes to connect the lifting device
VE552: One side of the outer ring is provided with three evenly distributed threaded holes to connect the lifting device
VE553: Three evenly distributed threaded holes are provided on both sides of the outer ring to connect the lifting device
VE632: Three evenly distributed threaded holes on one side of the seat ring to connect the lifting device
VG114: surface hardened stamped steel cage
VH: Full of rollers bearing, designed to prevent the rollers from slipping out
VL0241: The outer surface of the outer ring is coated with alumina, and the insulation capacity is up to 1000VDC
VL2071: The outer surface of the inner ring is coated with alumina, and the insulation capacity is up to 1000VDC
VQ015: The inner ring with convex arc raceway, which can allow larger alignment errors
VQ424: Rotation accuracy is higher than C08
VT143: filled with extreme pressure (EP) grease
W: the outer ring without a groove or hole for lubrication
WT: Used to describe the wide temperature grease range(operating temperature range from -40 to +160°C) used in the bearing. For other greases that are different from the specified standard grease but in this temperature range, only add a two-digit number after WT. The filling amount that different from the standard, is expressed by a letter or a combination of letters and numbers after WT, and the code used is the same as that of HT. For example: WT or WTF1
W20: Three lubrication holes on the outer ring
W26: Six lubrication holes in the inner ring
W33: Outer ring with lubrication groove and three lubrication holes
W33X: Outer ring with lubrication groove and six lubrication holes
W513: There are lubrication grooves and three lubrication holes on the outer ring and six lubrication holes on the inner ring
W64: Bearing without solid state
W77: Outer ring with lubrication groove and three lubrication holes with plugs
X: 1, the external dimensions are changed to the ISO standard; 2, the cylindrical rolling surface (roller bearing)
Y: Stamping brass cage, rolling element guide, and then there may be numbers to indicate different designs, such as Y1
Z: Stamped steel dust cover on one side of the bearing
2Z: Stamped steel dust cover on both sides of the bearing
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