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FAG bearing model FAG bearing prefix and suffix code meaning explanation
Source: this site     Release time:2021-12-23

FAG Bearing code consists of basic code, pre-code and post-code.
The basic code indicates the basic type, structure and size of the bearing.
The prefix code means that the bearing parts are placed before the basic code.
The post code indicates the supplementary code added after the basic code of the bearing when there are changes in the bearing structure, size, seal, cage, tolerance, clearance, heat treatment, packaging, technical requirements, etc.
Basic composition of rolling bearing code
Rolling bearing code——Prefix
Rolling bearing code——Suffix
——Prefix code
Prefix code R is placed directly before the basic code of the bearing, and the other codes are used Small dots are separated from the base code.
GS.——Thrust Cylindrical Roller Bearing Race. Example: GS.81112.
K.—— Combination of rolling element and cage. Example: The combination of thrust cylindrical roller and cage K.81108
R - bearing without separable inner or outer ring. Example: RNU207——NU207 bearing without inner ring.
WS—— Thrust Cylindrical Roller Bearing Shaft Washer. Example: WS.81112.
—— Internal design
—— Outer dimension and deformation design
—— Seal
—— Cage
—— Tolerance
—— Clearance
—— Heat treatment
—— Special design
—— Machine tool spindle bearing
—— Low noise bearing

—— Post code
The post code is placed in the basic code behind. When there are multiple sets of postcodes, they should be arranged from left to right in the order of postcodes listed in the bearing code table. Some post-code names are separated from the base code by a small dot.

Post code—internal structure
A, B, C, D, E—internal structure change
Example: Angular contact ball bearing 7205C, 7205E, 7205B, C—15 ° contact angle , E-25 ° antenna, B-40 ° contact angle.
Example: Cylindrical Roller, Spherical Roller and Thrust Spherical Roller Bearings N309E , 21309 E , 29412E - Enhanced design, increased bearing load capacity.
VH—— Roller self-locking full complement cylindrical roller bearing (roller diameter is different from the standard bearing of the same type).
Example: NJ2312VH.
Post code — Bearing dimensions and external structure
DA — Separable double row angular contact ball bearing with double half inner ring. Example: 3306DA.
DZ—— Cylindrical outer diameter roller bearing. Example: ST017DZ.
K—— Taper bore bearing, taper 1:12. Example: 2308K.
K30- Tapered bore bearing, taper 1:30. Example: 24040 K30.
2LS——Double row cylindrical roller bearing with double inner ring with dust cover on both sides. Example: NNF5026VC.2LS.V——Internal structure change, double inner ring, with dust cover on both sides, full complement double row cylindrical roller bearing.
N——Bearing with snap groove on outer ring. Example: 6207N.
NR - Bearings with snap grooves and snap rings on the outer ring. Example: 6207 NR.
N2-——Four-point contact ball bearing with two retaining grooves on the outer ring. Example: QJ315N2.
S——The bearing with lubricating oil groove and three lubricating oil holes in the outer ring. Example: 23040 S. Spherical roller bearings with bearing outer diameter D ≥ 320mm are not marked with S .
X——The dimensions conform to international standards. Example: 32036X
Z - technical conditions for special structures. Arranged downwards from Z11 onwards. Example: Z15——Stainless steel bearing (W-N01.3541).
ZZ——The roller bearing has two retaining rings that guide the outer ring.

Post code —— Sealing and dustproof
RSR—— Bearing with sealing ring on one side. Example: 6207 RSR
.2RSR——The bearing has seals on both sides. Example: 6207.2RSR.
ZR—— The bearing has a dust cover on one side. Example: 6207 ZR
.2ZR Bearing with dust cover on both sides. Example: 6207.2ZR
ZRN—— The bearing has a dust cover on one side and a stop groove on the outer ring on the other side. Example: 6207 ZRN.
.2ZRN—— Bearing with dust cover on both sides, with stop groove on the outer ring. Example: 6207.2ZRN.

Post code - cage and its material
1 Solid cage.
A or B is placed after the cage code, A means the cage is guided by the outer ring, B means the cage is guided by the inner ring.
F—— Steel solid cage, guided by rolling elements.
FA—— Steel solid cage, outer ring guide.
FAS—— Steel solid cage, outer ring guide, with lubricating groove.
FB—— Steel solid cage, inner ring guide.
FBS—— Steel solid cage, inner ring guide, with lubricating groove.
FH—— Steel solid cage, carburized and quenched.
H, H1—— Carburizing and quenching cage.
FP—— Steel solid window cage.
FPA—— Steel solid window cage, outer ring guide.
FPB—— Steel solid window cage, inner ring guide.
FV , FV1——Steel solid window cage, treated with aging and tempering.
L—— Light metal solid cage, guided by rolling elements.
LA—— Light metal solid cage, outer ring guide.
LAS—— Light metal solid cage, outer ring guide, with lubricating groove.
LB—— Light metal solid cage, inner ring guide.
LBS—— Light metal solid cage, inner ring guide, with lubricating groove.
LP—— Light metal solid window cage.
LPA—— Light metal solid window cage, outer ring guide.
LPB—— Light metal solid window cage, inner ring guide (thrust roller bearing is shaft guide).
M, M1—— Brass solid cage.
MA—— Brass solid cage, outer ring guide.
MAS—— Brass solid cage, outer ring guide, with lubricating groove.
MB—— Brass solid cage, guided by inner ring (thrust spherical roller bearing is guided by shaft ring).
MBS—— Brass solid cage, inner ring guide, with lubricating groove.
MP—— Brass solid straight pocket cage.
MPA—— Brass solid straight pocket and cage, outer ring guide.
MPB—— Brass solid straight pocket cage, inner ring guide.
T—— Phenolic laminated tube solid cage, guided by rolling elements.
TA—— Phenolic laminated tube solid cage, outer ring guide.
TB—— Phenolic laminated cloth tube solid cage, inner ring guide.
THB—— Phenolic laminated cloth tube pocket cage, inner ring guide.
TP—— Phenolic layer burial tube straight pocket cage.
TPA—— Phenolic Laminated Fabric Tube Straight Pocket Cage, Guided by Outer Ring.
TPB—— Phenolic Laminated Tube Straight Pocket Cage, Guided by Inner Ring.
TN—— Engineering plastic moulded cage, guided by rolling elements, with additional numbers indicating different materials.
TNH—— Engineering plastic self-locking pocket cage.
TV—— Glass fiber reinforced polyamide solid cage, guided by steel balls.
TVH—— Glass fiber reinforced polyamide self-locking pocket solid cage, guided by steel balls.
TVP—— Glass fiber reinforced polyamide window solid cage, guided by steel balls.
TVP2—— Glass fiber reinforced polyamide solid cage, roller guided.
TVPB—— Glass fiber reinforced polyamide solid cage, guided by inner ring (thrust roller bearing is guided by shaft).
TVPB1 - glass fiber reinforced polyamide solid window cage, shaft guide (thrust roller bearing).
Stamping cage
J—— Steel stamping cage.
JN—— Deep groove ball bearing riveted cage.
Cage change
The number added after the cage code, or inserted in the middle of the cage code, indicates that the cage structure has been changed. These numbers are for transitional periods only, eg: NU1008M 1 .
Rear Code — Cageless Bearings
V — Full Complement Rolling Element Bearings. Example: NU207V.
VT - full complement rolling element bearing with spacer balls or rollers. Example: 51120VT.

Post-code —— Tolerance class (dimensional accuracy and rotation accuracy)
P0—— Tolerance class conforms to the 0 class specified by the international standard ISO, which is omitted in the code and does not indicate.
P6——Tolerance class conforms to class 6 specified by the international standard ISO.
P6X - Grade 6 tapered roller bearings with tolerance class in accordance with the international standard ISO.
P5 - Tolerance class 5 according to the international standard ISO.
P4 - Tolerance class 4 according to international standard ISO.
P2 - Tolerance class according to international standard ISO class 2 (excluding tapered roller bearings).
SP—— Dimensional accuracy equivalent to class 5 and rotational accuracy equivalent to class 4 (double row cylindrical roller bearings).
UP - Dimensional accuracy equivalent to class 4, rotational accuracy higher than class 4 (double row cylindrical roller bearings).
HG—— Dimensional accuracy equivalent to class 4, rotational accuracy higher than class 4 and lower than class 2 (spindle bearings).

Postcode - Clearance
C1 - Clearance meets standard 1 group, less than 2 groups.
C2—— The clearance conforms to the standard 2 groups, less than 0 groups.
C0—— Group 0 whose clearance conforms to the standard, omitted in the code, not indicated.
C3——The clearance conforms to the 3 groups specified by the standard, and the clearance is greater than 0 group.
C4—— The clearance conforms to the 4 groups specified by the standard, and the clearance is greater than 3 groups.
C5—— The clearance conforms to the 5 groups specified in the standard, and the clearance is greater than 4 groups.

When the tolerance class code and clearance code need to be expressed at the same time, take the tolerance class code (P0 class not expressed) and the clearance group number (0 group not expressed) combined to express.
Example: P63=P6+C3 , which means the bearing tolerance class is P6 class, with 3 groups of radial clearance.
P52=P5+C2 , which means bearing tolerance class P5, radial clearance group 2.
Non-standard clearance, when special radial clearance and axial clearance are required, the limit value should be in μm after the letter R (radial clearance) or A (axial clearance). Indicates that the numbers should be separated by small dots.
Example: 6210.R10.20——6210 bearing, radial clearance 10 μm to 20 μm.
6212.A120.160—6212 bearing, axial clearance 120 μm to 160 μm.

Post Code — Bearing for Noise Testing
F3 — Low Noise Bearing. Mainly refers to cylindrical roller bearings and deep groove ball bearings with inner diameter d > 60mm. Example: 6213.F3 .
G—— Low noise bearing. Mainly refers to deep groove ball bearings with inner diameter d ≤ 60mm. Example: 6207.G

Post code —— Heat treatment
S0—— The bearing ring has been tempered at high temperature, and the working temperature can reach 150 ℃.
S1—— The bearing ring is tempered at high temperature, and the working temperature can reach 200 ℃.
S2—— The bearing ring is tempered at high temperature, and the working temperature can reach 250 ℃.
S3—— The bearing ring is tempered at high temperature, and the working temperature can reach 300 ℃.
S4—— The bearing ring is tempered at high temperature, and the working temperature can reach 350 ℃.

Post-Code — Special Specifications
F··——Manufacturing Specifications for Consecutive Numbering. Example: F80—— Bearing inner and outer diameter tolerance and radial clearance compression.
K··—— Continuously numbered inspection technical conditions. Example K5 - bearing inner and outer diameter tolerance compression.
.ZB—— Cylindrical roller with crown with diameter greater than 80mm. Example: NU 364.ZB.
.ZB2—— The convexity at both ends of the needle roller is larger than the general technical requirements. Example: K18 × 26 × 20F .ZB2.
ZW—— Double row needle roller and cage assembly. Example: K20 × 25 × 40FZW.
.700···—— Specifications with consecutive numbers starting with 700000.
Z52JN.790144—— Bearing can be used for high temperature and low speed, after special heat treatment, steel plate stamping and riveting cage, large clearance, phosphating treatment, grease injection, the operating temperature can exceed 270 ℃.

Post code—Special technical conditions
KDA—Split inner ring
K—Tapered bore 1:12
K30—Tapered bore 1:30
>N——circular in the outer ring for snap ring
S——The suffix has been cancelled in the new E1 series! Outer ring oil grooves and oil holes are now standard.
N2 two retaining grooves for retaining the outer ring

Post code — paired bearings and machine tool spindle bearings
1) Paired bearings that meet the K technical conditions, the following special technologies The conditions are related to paired bearings:
K1—— Two sets of deep groove ball bearings are installed in pairs to bear one-way axial load.
K2—— Two sets of deep groove ball bearings are installed in pairs to bear bidirectional axial load.
K3—— Two sets of deep groove ball shafts are installed back-to-back without play (O-type installation).
K4—— Two sets of deep groove ball bearings are installed face to face without clearance (X type installation).
K6—— Two sets of angular contact ball bearings are installed in pairs to bear unidirectional axial load.
K7—— Two sets of angular contact ball bearings are installed back-to-back without clearance (O-type installation).
K8—— Two sets of angular contact ball bearings are installed face to face without clearance (X-type installation)
K9—— Two sets of tapered roller bearings with spacers between inner and outer rings are installed in pairs to withstand a single Axial load.
K10—— Two sets of tapered roller bearings with spacers between inner and outer rings are installed back-to-back without clearance (O-type installation)
K11—— Two sets of tapered roller bearings with spacers between outer rings Bearings are mounted face to face without play (X-mount).

Bearings arranged in pairs or groups need to be packaged together for delivery, or marked as a pair. Bearings of different groups are not interchangeable. When installing bearings belonging to the same group, the installation should be carried out according to the marks and positioning lines. If each pair of bearings is arranged according to a certain amount of axial or radial clearance, the clearance should be marked according to item 1 (2) in item (7) after the K specification. For example, 31314A .K11.A100.140 means two sets of 31314A single row tapered roller bearings, mounted face to face, with spacers at a certain distance between the outer rings, and the axial clearance of the bearings is between 100 μm and 140 μm before assembly. Backlash is zero.

Universal paired bearings
Can be installed in any (tandem, face-to-face or back-to-back) pairing, the rear code is UA , UO and UL .
.UA—— Small axial clearance when the bearings are mounted face to face or back to back.
.UO—— No play when the bearings are mounted face to face or back to back.
.UL - Slight pre-interference when the bearings are mounted face-to-face or back-to-back. For example, B 7004C .TPA.P4.K5.UL
represents an angular contact ball bearing with a contact angle of 15o for the main shaft, a phenolic laminated tube with a straight pocket solid cage, outer ring guide, bearing tolerance class 4, The inner and outer diameter tolerances are narrowed, and the general structure is installed in pairs. The bearings have slight pre-interference when they are installed back-to-back or face-to-face.

Post code — machine tool spindle bearings
KTPA.HG This pocket solid cage, outer ring guide, accuracy class HG. TPA.HG.K5.UL solid cage with cloth pockets, outer ring guide, accuracy class HG, bearing outer and inner diameter tolerances narrowed, whole body structure installed in pairs, bearings are installed face-to-face or back-to-back with a slight prestress Interference.
TPA.P2.K5.UL Clamped cloth pocket solid cage, outer ring guide, accuracy class HG, bearing outer and inner diameter tolerances narrowed, whole body structure installed in pairs, bearings are installed face-to-face or back-to-back with Slight interference.
TPA.P2 UL solid cage with pockets, outer ring guide, accuracy class HG, bearing outer and inner diameter tolerances narrowed, whole body structure installed in pairs, bearings installed face-to-face or back-to-back with a slight bias Interference.

Post code — Machine tool spindle bearing
TPA.P2.K5.UL Clamped pocket solid cage, outer ring guide, accuracy class HG, universal structure for paired installation, bearing in Install face-to-face or back-to-back with light interference.
C Contact Angle 15' 'C.
D Contact Angle 25' 'C .
Suffix code - symbol with special meaning
F1
F2
J 20A ,J 20A
T 41A ,T41B
Suffixes and technical details of rolling bearings in paper industry
Suffix description
C2 Internal radial clearance less than normal value
C3 Internal radial clearance greater than normal value
C4 Internal radial clearance greater than C3
C5 Internal radial clearance greater than C4
E , ED Improved internal structure
H40 bearing outer ring has no lubrication groove or lubrication hole
H40AB spherical roller bearing inner ring has 6 lubrication holes
H40AC spherical roller bearing inner ring has 6 lubrication holes Holes and Lubrication Slots
H40CA Spherical Roller Bearing Outer Ring with 6 Lubrication Holes and Lubrication Slots
H44S Outer Ring with Lubrication Holes and Plugged with Aluminum Plugs
H44SA With 3 Aluminum Plugs for Plugging Hold the lubrication holes on the outer ring
H44SB with 6 aluminum plugs to plug the lubrication holes on the inner ring (only in combination with H40AC)
H88 The running accuracy of the inner ring is P5, the outer ring is P4+J26C +M15NZ+ Width tolerance limited by outer ring
H140 Combination of H40AC, H44SA, H44SB and T52BW
H157 Combination of H40 and H40AC+ grease nipple
J26A The radial runout point is marked on the inner ring or sleeve
J26B Runout points marked on outer ring
J26C Runout points marked on inner and outer rings
M Machined brass cage, roller guided
MB Two-piece machined brass cage Cage, Inner Ring Guided
MB1 Single-piece Machined Brass Cage, Inner Ring Guided
MB2 Improved Two-Piece Machined Brass Cage, Inner Ring Guided
M15NZ with Talyrond Figures and Series Measurement report of number
M17D Inner ring crack inspection
T27 Cylindrical roller with convex outer diameter
T50H Limited outer diameter tolerance (both upper and lower deviations are negative)
T52BW Inner and outer ring P5 The running accuracy (+J26C)
W10A outer ring isotemp quenching
W10D inner and outer ring isotemp quenching
W209B inner ring is made of case hardened steel
Common combination:
C3.H40AB.T52BW
C3.H40AC.T52BW
C3.H140
C3.T52BW
C5.M17D.T27.W10A.W209B
C5.M17D.T27.W10D
H40AB.T52BW
>H40AC.T52BW
H44S.T52BW

—— Seal
—— Cage
—— Tolerance
—— Clearance
—— Heat Treatment
—— Special Design
—— Machine Tool Spindle Bearings
—— Low Noise Bearings

—— Post Code
The suffix code is placed after the base code. When there are multiple sets of postcodes, they should be arranged from left to right in the order of postcodes listed in the bearing code table. Some post-code names are separated from the base code by a small dot.

Post code—internal structure
A, B, C, D, E—internal structure change
Example: Angular contact ball bearing 7205C, 7205E, 7205B, C—15 ° contact angle , E-25 ° antenna, B-40 ° contact angle.
Example: Cylindrical Roller, Spherical Roller and Thrust Spherical Roller Bearings N309E , 21309 E , 29412E - Enhanced design, increased bearing load capacity.
VH—— Roller self-locking full complement cylindrical roller bearing (roller diameter is different from the standard bearing of the same type).
Example: NJ2312VH.
Post code — Bearing dimensions and external structure
DA — Separable double row angular contact ball bearing with double half inner ring. Example: 3306DA.
DZ—— Cylindrical outer diameter roller bearing. Example: ST017DZ.
K—— Taper bore bearing, taper 1:12. Example: 2308K.
K30- Tapered bore bearing, taper 1:30. Example: 24040 K30.
2LS——Double row cylindrical roller bearing with double inner ring with dust cover on both sides. Example: NNF5026VC.2LS.V——Internal structure change, double inner ring, with dust cover on both sides, full complement double row cylindrical roller bearing.
N——Bearing with snap groove on outer ring. Example: 6207N.
NR - Bearings with snap grooves and snap rings on the outer ring. Example: 6207 NR.
N2-——Four-point contact ball bearing with two retaining grooves on the outer ring. Example: QJ315N2.
S——The bearing with lubricating oil groove and three lubricating oil holes in the outer ring. Example: 23040 S. Spherical roller bearings with bearing outer diameter D ≥ 320mm are not marked with S .
X——The dimensions conform to international standards. Example: 32036X
Z - technical conditions for special structures. Arranged downwards from Z11 onwards. Example: Z15——Stainless steel bearing (W-N01.3541).
ZZ——The roller bearing has two retaining rings that guide the outer ring.

Post code —— Sealing and dustproof
RSR—— Bearing with sealing ring on one side. Example: 6207 RSR
.2RSR——The bearing has seals on both sides. Example: 6207.2RSR.
ZR—— The bearing has a dust cover on one side. Example: 6207 ZR
.2ZR Bearing with dust cover on both sides. Example: 6207.2ZR
ZRN—— The bearing has a dust cover on one side and a stop groove on the outer ring on the other side. Example: 6207 ZRN.
.2ZRN—— Bearing with dust cover on both sides, with stop groove on the outer ring. Example: 6207.2ZRN.

Post code - cage and its material
1 Solid cage.
A or B is placed after the cage code, A means the cage is guided by the outer ring, B means the cage is guided by the inner ring.
F—— Steel solid cage, guided by rolling elements.
FA—— Steel solid cage, outer ring guide.
FAS—— Steel solid cage, outer ring guide, with lubricating groove.
FB—— Steel solid cage, inner ring guide.
FBS—— Steel solid cage, inner ring guide, with lubricating groove.
FH—— Steel solid cage, carburized and quenched.
H, H1—— Carburizing and quenching cage.
FP—— Steel solid window cage.
FPA—— Steel solid window cage, outer ring guide.
FPB—— Steel solid window cage, inner ring guide.
FV , FV1——Steel solid window cage, treated with aging and tempering.
L—— Light metal solid cage, guided by rolling elements.
LA—— Light metal solid cage, outer ring guide.
LAS—— Light metal solid cage, outer ring guide, with lubricating groove.
LB—— Light metal solid cage, inner ring guide.
LBS—— Light metal solid cage, inner ring guide, with lubricating groove.
LP—— Light metal solid window cage.
LPA—— Light metal solid window cage, outer ring guide.
LPB—— Light metal solid window cage, inner ring guide (thrust roller bearing is shaft guide).
M, M1—— Brass solid cage.
MA—— Brass solid cage, outer ring guide.
MAS—— Brass solid cage, outer ring guide, with lubricating groove.
MB—— Brass solid cage, guided by inner ring (thrust spherical roller bearing is guided by shaft ring).
MBS—— Brass solid cage, inner ring guide, with lubricating groove.
MP—— Brass solid straight pocket cage.
MPA—— Brass solid straight pocket and cage, outer ring guide.
MPB—— Brass solid straight pocket cage, inner ring guide.
T—— Phenolic laminated tube solid cage, guided by rolling elements.
TA—— Phenolic laminated tube solid cage, outer ring guide.
TB—— Phenolic laminated cloth tube solid cage, inner ring guide.
THB—— Phenolic laminated cloth tube pocket cage, inner ring guide.
TP—— Phenolic layer burial tube straight pocket cage.
TPA—— Phenolic Laminated Fabric Tube Straight Pocket Cage, Guided by Outer Ring.
TPB—— Phenolic Laminated Tube Straight Pocket Cage, Guided by Inner Ring.
TN—— Engineering plastic moulded cage, guided by rolling elements, with additional numbers indicating different materials.
TNH—— Engineering plastic self-locking pocket cage.
TV—— Glass fiber reinforced polyamide solid cage, guided by steel balls.
TVH—— Glass fiber reinforced polyamide self-locking pocket solid cage, guided by steel balls.
TVP—— Glass fiber reinforced polyamide window solid cage, guided by steel balls.
TVP2—— Glass fiber reinforced polyamide solid cage, roller guided.
TVPB—— Glass fiber reinforced polyamide solid cage, guided by inner ring (thrust roller bearing is guided by shaft).
TVPB1—— Glass fiber reinforced polyamide solid window cage, shaft guided (thrust roller bearing).
Stamping cage
J—— Steel stamping cage.
JN—— Deep groove ball bearing riveted cage.
Cage change
The number added after the cage code, or inserted in the middle of the cage code, indicates that the cage structure has been changed. These numbers are for transitional periods only, eg: NU1008M 1 .
Rear Code — Cageless Bearings
V — Full Complement Rolling Element Bearings. Example: NU207V.
VT - full complement rolling element bearing with spacer balls or rollers. Example: 51120VT.

Post-code —— Tolerance class (dimensional accuracy and rotation accuracy)
P0—— Tolerance class conforms to the 0 class specified by the international standard ISO, which is omitted in the code and does not indicate.
P6——Tolerance class conforms to class 6 specified by the international standard ISO.
P6X - Grade 6 tapered roller bearings with tolerance class in accordance with the international standard ISO.
P5 - Tolerance class 5 according to the international standard ISO.
P4 - Tolerance class 4 according to international standard ISO.
P2 - Tolerance class according to international standard ISO class 2 (excluding tapered roller bearings).
SP—— Dimensional accuracy equivalent to class 5 and rotational accuracy equivalent to class 4 (double row cylindrical roller bearings).
UP - Dimensional accuracy equivalent to class 4, rotational accuracy higher than class 4 (double row cylindrical roller bearings).
HG—— Dimensional accuracy equivalent to class 4, rotational accuracy higher than class 4 and lower than class 2 (spindle bearings).

Postcode - Clearance
C1 - Clearance meets standard 1 group, less than 2 groups.
C2—— The clearance conforms to the standard 2 groups, less than 0 groups.
C0—— Group 0 whose clearance conforms to the standard, omitted in the code, not indicated.
C3——The clearance conforms to the 3 groups specified by the standard, and the clearance is greater than 0 group.
C4—— The clearance conforms to the 4 groups specified by the standard, and the clearance is greater than 3 groups.
C5—— The clearance conforms to the 5 groups specified in the standard, and the clearance is greater than 4 groups.

When the tolerance class code and clearance code need to be expressed at the same time, take the tolerance class code (P0 class not expressed) and the clearance group number (0 group not expressed) combined to express.
Example: P63=P6+C3 , which means the bearing tolerance class is P6 class, with 3 groups of radial clearance.
P52=P5+C2 , which means bearing tolerance class P5, radial clearance group 2.
Non-standard clearance, when special radial clearance and axial clearance are required, the limit value should be in μm after the letter R (radial clearance) or A (axial clearance). Indicates that the numbers should be separated by small dots.
Example: 6210.R10.20——6210 bearing, radial clearance 10 μm to 20 μm.
6212.A120.160—6212 bearing, axial clearance 120 μm to 160 μm.

Post Code — Bearing for Noise Testing
F3 — Low Noise Bearing. Mainly refers to cylindrical roller bearings and deep groove ball bearings with inner diameter d > 60mm. Example: 6213.F3 .
G—— Low noise bearing. Mainly refers to deep groove ball bearings with inner diameter d ≤ 60mm. Example: 6207.G

Post code —— Heat treatment
S0—— The bearing ring has been tempered at high temperature, and the working temperature can reach 150 ℃.
S1—— The bearing ring is tempered at high temperature, and the working temperature can reach 200 ℃.
S2—— The bearing ring is tempered at high temperature, and the working temperature can reach 250 ℃.
S3—— The bearing ring is tempered at high temperature, and the working temperature can reach 300 ℃.
S4—— The bearing ring is tempered at high temperature, and the working temperature can reach 350 ℃.

Post-Code — Special Specifications
F··——Manufacturing Specifications for Consecutive Numbering. Example: F80—— Bearing inner and outer diameter tolerance and radial clearance compression.
K··—— Continuously numbered inspection technical conditions. Example K5 - bearing inner and outer diameter tolerance compression.
.ZB—— Cylindrical roller with crown with diameter greater than 80mm. Example: NU 364.ZB.
.ZB2—— The convexity at both ends of the needle roller is greater than the general technical requirements. Example: K18 × 26 × 20F .ZB2.
ZW—— Double row needle roller and cage assembly. Example: K20 × 25 × 40FZW.
.700···—— Specifications with consecutive numbers starting with 700000.
Z52JN.790144—— Bearing can be used for high temperature and low speed, after special heat treatment, steel plate stamping and riveting cage, large clearance, phosphating treatment, grease injection, the operating temperature can exceed 270 ℃.

Post code—Special technical conditions
KDA—Split inner ring
K—Tapered bore 1:12
K30—Tapered bore 1:30
>N——circular in the outer ring for snap ring
S——The suffix has been cancelled in the new E1 series! Outer ring oil grooves and oil holes are now standard.
N2 two retaining grooves for retaining the outer ring

Post code — paired bearings and machine tool spindle bearings
1) Paired bearings that meet the K technical conditions, the following special technologies The conditions are related to paired bearings:
K1—— Two sets of deep groove ball bearings are installed in pairs to bear one-way axial load.
K2—— Two sets of deep groove ball bearings are installed in pairs to bear bidirectional axial load.
K3—— Two sets of deep groove ball shafts are installed back-to-back without play (O-type installation).
K4—— Two sets of deep groove ball bearings are installed face to face without clearance (X type installation).
K6—— Two sets of angular contact ball bearings are installed in pairs to bear unidirectional axial load.
K7—— Two sets of angular contact ball bearings are installed back-to-back without clearance (O-type installation).
K8—— Two sets of angular contact ball bearings are installed face to face without clearance (X-type installation)
K9—— Two sets of tapered roller bearings with spacers between inner and outer rings are installed in pairs to withstand a single Axial load.
K10—— Two sets of tapered roller bearings with spacers between inner and outer rings are installed back-to-back without clearance (O-type installation)
K11—— Two sets of tapered roller bearings with spacers between outer rings Bearings are mounted face to face without play (X-mount).
Bearings arranged in pairs or groups need to be packed together for delivery, or marked as a pair. Bearings of different groups are not interchangeable. When installing bearings belonging to the same group, the installation should be carried out according to the marks and positioning lines.

If each pair of bearings is configured according to a certain amount of axial or radial clearance, the clearance should be marked after the K technical conditions according to item 1 (2) in item (7). For example, 31314A .K11.A100.140 means two sets of 31314A single row tapered roller bearings, mounted face to face, with spacers at a certain distance between the outer rings, and the axial clearance of the bearings is between 100 μm and 140 μm before assembly. Backlash is zero.  

Universal paired bearings
Can be installed in any (tandem, face to face or back to back) pairing, the rear code is UA , UO and UL .
.UA—— Small axial clearance when the bearings are mounted face to face or back to back.
.UO—— No play when the bearings are mounted face to face or back to back.
.UL - Slight pre-interference when the bearings are mounted face-to-face or back-to-back. For example, B 7004C .TPA.P4.K5.UL
represents an angular contact ball bearing with a contact angle of 15o for the main shaft, a phenolic laminated tube with a straight pocket solid cage, outer ring guide, bearing tolerance class 4, The inner and outer diameter tolerances are narrowed, and the general structure is installed in pairs. The bearings have slight pre-interference when they are installed back-to-back or face-to-face.

Post code — machine tool spindle bearings
KTPA.HG This pocket solid cage, outer ring guide, accuracy class HG. TPA.HG.K5.UL solid cage with cloth pockets, outer ring guide, accuracy class HG, bearing outer and inner diameter tolerances narrowed, whole body structure installed in pairs, bearings are installed face-to-face or back-to-back with a slight prestress Interference.
TPA.P2.K5.UL Clamped cloth pocket solid cage, outer ring guide, accuracy class HG, bearing outer and inner diameter tolerances narrowed, whole body structure installed in pairs, bearings are installed face-to-face or back-to-back with Slight interference.
TPA.P2 UL solid cage with pockets, outer ring guide, accuracy class HG, bearing outer and inner diameter tolerances narrowed, whole body structure installed in pairs, bearings installed face-to-face or back-to-back with a slight bias Interference.

Post code — Machine tool spindle bearing
TPA.P2.K5.UL Clamped pocket solid cage, outer ring guide, accuracy class HG, universal structure for paired installation, bearing in Install face-to-face or back-to-back with light interference.
C Contact Angle 15' 'C.
D Contact Angle 25' 'C .
Suffix code - symbol with special meaning
F1
F2
J 20A ,J 20A
T 41A ,T41B
Suffixes and technical details of rolling bearings in paper industry
Suffix description
C2 Internal radial clearance less than normal value
C3 Internal radial clearance greater than normal value
C4 Internal radial clearance greater than C3
C5 Internal radial clearance greater than C4
E , ED Improved internal structure
H40 bearing outer ring has no lubrication groove or lubrication hole
H40AB spherical roller bearing inner ring has 6 lubrication holes
H40AC spherical roller bearing inner ring has 6 lubrication holes Holes and Lubrication Slots
H40CA Spherical Roller Bearing Outer Ring with 6 Lubrication Holes and Lubrication Slots
H44S Outer Ring with Lubrication Holes and Plugged with Aluminum Plugs
H44SA With 3 Aluminum Plugs for Plugging Hold the lubrication holes on the outer ring
H44SB with 6 aluminum plugs to plug the lubrication holes on the inner ring (only in combination with H40AC)
H88 The running accuracy of the inner ring is P5, the outer ring is P4+J26C +M15NZ+ Width tolerance limited by outer ring
H140 Combination of H40AC, H44SA, H44SB and T52BW
H157 Combination of H40 and H40AC+ grease nipple
J26A The maximum point of radial runout is marked on the inner ring or on the sleeve
J26B Maximum point of radial runout marked on outer ring
J26C Maximum point of radial runout marked on inner and outer ring
M Machined brass cage, roller guide
MB Two-piece machined Brass Cage, Inner Ring Guided
MB1 Single-piece Machined Brass Cage, Inner Ring Guided
MB2 Improved Two-Piece Machined Brass Cage, Inner Ring Guided
M15NZ with Talyrond Measurement report of drawing and serial number
M17D Inner ring crack inspection
T27 Cylindrical roller with convex outer diameter
T50H Limited outer diameter tolerance (both upper and lower deviations are negative)
T52BW Running accuracy of inner and outer ring P5 (+J26C)
W10A outer ring isotemp quenching
W10D inner and outer ring isotemp quenching
W209B inner ring made of case hardened steel
Common combination:
C3. H40AB.T52BW
C3.H40AC.T52BW
C3.H140
C3.T52BW
C5.M17D.T27.W10A.W209B
C5.M17D.T27.W10D
H40AB. T52BW
H40AC.T52BW
H44S.T52BW

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