Each letter has one or more meanings, such as FAG bearings,
1. Pre-code
The front code R is placed directly before the basic code of the bearing, and the rest of the front code is separated from the basic code with a small dot.
GS—thrust cylindrical roller bearing race. Example: GS.81112
K-The combination of rolling element and cage. Example: The combination of thrust cylindrical roller and cage K.81108.
R --- Bearings without separable inner or outer rings. Example: RNU207-NU207 bearing without inner ring.
WS—thrust cylindrical roller bearing shaft ring. Example: WS.81112.
2 Post code
The post code is placed behind the basic code. When there are multiple groups of post codes, they should be arranged from left to right in the order of the post codes listed in the bearing code table. Some postcodes are separated from the basic code with a small dot in front of them.
(1) Internal structure
A, B, C, D, E internal structure changes
Example 1: Angular contact ball bearings 7205C, 7205E, 7205B, C-15 degree contact angle, E-25 degree contact angle, B-40 degree contact angle.
Example 2: Cylindrical roller, spherical roller and thrust spherical roller bearings N309E, 21309E, 29412E-reinforced design, the bearing load capacity is improved.
VH-roller self-locking full complement cylindrical roller bearing (the diameter of the double circle of the roller is different from the standard bearing of the same model). Example: NJ2312VH
(2) The external dimensions and external structure of the bearing
DA-Separable double row angular contact ball bearing with double half inner ring. Example: 3306DA
DZ-cylindrical outer diameter roller bearing. Example: ST017DZ
K-tapered bore bearing, taper 1:12. Example: 2308K.
K30-tapered bore bearing, taper 1:30. Example: 24040K30.
2LS-Double inner ring, double row cylindrical roller bearing with dust cover on both sides. Example: NNF5026C.2LS.V- internal structure change, double inner ring, dust cover on both sides, full complement double row cylindrical roller bearing.
N-bearing with a stop groove on the outer ring. Example: 6207N.
NR-Bearing with stop groove and stop ring on the outer ring. Example: 6207NR.
N2-Four-point contact ball bearing with two stop grooves on the outer ring. Example: QJ315N2.
S-Bearing with lubricating oil groove and three lubricating holes in the outer ring. Example: 23040 is. Spherical roller bearings whose outer diameter D is greater than or equal to 320 mm are not marked with S.
X-outer dimensions comply with international standards. Example: 32036X.
Z..-Technical conditions for special structures. Arranged downwards from Z11. Example: Z15-stainless steel bearing (W-N01.3541).
ZZ-roller bearings have two retaining rings that guide the outer ring.
(3) Sealing and dustproof
RSR-bearing has a sealing ring on one side. Example: 6207RSR.
ZR-bearing has a dust cover on one side. Example: 6207ZR.
2ZR-Bearings are equipped with sealing covers on both sides. Example: 62072ZR.
ZRN-bearing has a dust cover on one side and a stop groove on the outer ring on the other side. Example: 6207ZRN.
2ZRN-Bearings are equipped with dust caps on both sides and stop grooves on the outer ring. Example: 62072ZRN.
(4) Cage and its materials
1) Physical cage.
A or B is placed after the cage code, A means the cage is guided by the outer ring, and 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 lubrication groove.
FB-steel solid cage, inner ring guide.
FBS-steel solid cage, inner ring guide, with lubrication groove.
FH-steel solid cage, carburized and quenched.
H, H1- carburizing and quenching cage.
FP-steel solid window type cage.
FPA-steel solid window type cage, outer ring guide.
FPB-steel solid window type cage, inner ring guide.
FV, FV1-Steel solid window cage, aging and quenching and tempering treatment.
L-light metal solid cage, guided by rolling elements.
LA-light metal solid cage, guided by the outer ring.
LAS-light metal solid cage, outer ring guide, with lubrication groove.
LB-light metal solid cage, inner ring guide.
LBS-light metal solid cage, inner ring guide, with lubrication groove.
LP-light metal solid window type cage.
LPA-light metal solid window type cage, outer ring guide.
LPB-light metal solid window type 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 lubrication groove.
MB-brass solid cage, inner ring guide (thrust spherical roller bearing is shaft ring guide).
MBS-brass solid cage, inner ring guide, with lubrication groove.
MP-brass solid straight pocket hole cage.
MPA-brass solid straight pocket hole cage, outer ring guide.
MPB-brass solid straight pocket cage, inner ring guide.
T-phenolic laminated cloth tube solid cage, guided by rolling elements.
TA-phenolic laminated cloth tube solid cage, outer ring guide.
TB-phenolic laminated cloth tube solid cage, inner ring guide.
THB-phenolic laminated cloth tube pocket type cage, inner ring guide.
TP-phenolic laminated cloth tube straight pocket holder.
TPA-phenolic laminated cloth tube straight pocket cage, outer ring guide.
TPB-phenolic laminated cloth tube straight pocket cage, inner ring guide.
TN-engineering plastic injection molding cage, rolling element guide, with additional numbers to indicate different materials.
TNH-engineering plastic self-locking pocket holder.
TV-glass fiber reinforced polyamide solid cage, guided by steel balls.
TVH-glass fiber reinforced polyamide self-locking pocket type solid cage, guided by steel balls.
TVP-glass fiber reinforced polyamide window type solid cage, guided by steel balls.
TVP2-glass fiber reinforced polyamide solid cage, roller guide.
TVPB-glass fiber reinforced polyamide solid cage, inner ring guide (thrust roller bearing is shaft guide).
TVPB1-glass fiber reinforced polyamide solid window cage, shaft guide (thrust roller bearing).
2) Stamping cage
J-steel stamping cage.
JN-deep groove ball bearing riveted cage.
3) Change of cage
The number added after the cage code or inserted in the middle of the cage code indicates that the cage structure has undergone changes. These figures are only used during the transition period, for example: NU1008M1.
(5) Bearing without cage
V-full complement rolling element bearings. Example: NU207V.
VT-Full complement rolling element bearing with isolated balls or rollers. Example: 51120VT.
(6) Tolerance grade (including dimensional accuracy and rotation accuracy)
P0-tolerance level conforms to the 0 level specified by the international standard ISO, and the code is omitted and not indicated.
The P6-tolerance class conforms to the level 6 specified by the international standard ISO.
P6X-Tolerance class conforms to the 6X tapered roller bearing specified by the international standard ISO.
P5-tolerance class conforms to the 5th class specified by international standard ISO.
P4-tolerance level conforms to level 4 specified by the international standard ISO.
P2-tolerance class conforms to the international standard ISO class 2 (not including tapered roller bearings).
SP-dimensional accuracy is equivalent to level 5, and rotation accuracy is equivalent to level 4 (double row cylindrical roller bearings).
UP-The dimensional accuracy is equivalent to level 4, and the rotation accuracy is higher than level 4 (double row cylindrical roller bearings).
HG-dimensional accuracy is equivalent to level 4, rotation accuracy is higher than level 4 and lower than level 2 (spindle bearing).
(7) Clearance
C1-Clearance meets the 1 group specified by the standard, and is less than 2 groups.
C2-Clearance meets the 2 groups specified by the standard, and is less than 0 group.
C0-Clearance conforms to the 0 group specified by the standard, and the code is omitted and not indicated.
C3-clearance meets the 3 groups specified by the standard, and is greater than 0 group.
C4- Clearance meets the 4 groups specified by the standard and is greater than 3 groups.
C5-Clearance meets the 5 groups specified by the standard and is greater than 4 groups.
1) When the tolerance grade code and the clearance code need to be expressed at the same time, take the tolerance grade code (not indicated for P0) plus the upstream clearance group number (not indicated for 0 group).
Example: P63=P6+C3, which means the bearing tolerance level is P6, and the radial clearance is 3 groups.
2) Non-standard clearance, in the case of special radial clearance and axial clearance, the relevant limit value should be expressed in microns after the letter R (radial clearance) or A (axial clearance), Use small dots to separate the numbers.
Example: 6210.R10.20-6210 bearing, the radial clearance is 10 to 20 microns.
(8) Testing noise bearing
F3-Low noise bearing. Mainly refers to cylindrical roller bearings and deep groove ball bearings with an inner diameter d greater than 60 mm. Example: 6213.F3.
G-low noise bearing. Mainly refers to deep groove ball bearings with inner diameter d less than or equal to 60 mm. Example: 6207.G.
(9) Heat treatment
S0-bearing ring has been subjected to high temperature tempering treatment, and the working temperature can reach 150 degrees Celsius.
S1-Bearing rings are subjected to high temperature tempering treatment, and the working temperature can reach 200 degrees Celsius.
S2-bearing rings have been subjected to high temperature tempering treatment, and the working temperature can reach 250 degrees Celsius.
S3-bearing rings have been subjected to high temperature tempering treatment, and the working temperature can reach 300 degrees Celsius.
S4-Bearing rings have been subjected to high temperature tempering treatment, and the working temperature can reach 350 degrees Celsius.
(10) Special technical conditions
F..-Sequentially numbered manufacturing technical conditions. Example: F80-bearing inner and outer diameter tolerance and radial clearance compression.
K..-Sequentially numbered inspection technical conditions. Example: K5-bearing inner, outer diameter tolerance is compressed.
.ZB-Cylinder rollers with convexity with a diameter greater than 80 mm. Example: NU364.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...Sequentially numbered technical conditions starting with 700000.
Z52JN.790144-bearing can be used for high temperature and low speed, after special heat treatment, steel stamping and riveting cage, large clearance, after phosphating treatment, grease injection, the use temperature can exceed 270 degrees Celsius.
Z52JN.790191-bearing can be used for high temperature and low speed, after special heat treatment, steel stamping and riveting cage, large clearance, phosphating treatment, grease injection, the use temperature can reach 270 degrees Celsius.
(11) Paired bearings
1) For paired bearings that meet K technical conditions, the following special technical conditions are related to paired bearings:
K1-Two sets of deep groove ball bearings are installed in pairs to withstand 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 bearings are installed back to back without clearance (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 withstand one-way 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 the inner and outer rings are installed in pairs to withstand unidirectional axial load.
K10-Two sets of tapered roller bearings with spacers between the inner and outer rings are installed back to back without clearance (O-type installation).
K11-Two sets of tapered roller bearings with spacers between the outer rings are installed face to face without clearance (X-type installation).
Bearing inquiry and sale Mobei.com
Bearings configured in pairs or groups need to be delivered together with the package word 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 in accordance with the markings and positioning. If each pair of bearings is configured with a certain amount of axial or radial clearance, the clearance should be indicated after the K technical condition according to item 1 2) in item (7). For example, 31314A.K11.A100.140 means that two sets of 31314A single row tapered roller bearings are installed face to face with a certain distance between the outer rings. The axial clearance before assembly of the bearing is between 100 microns and 140 microns, and the clearance after assembly is zero.
2) Universal matching bearings, which can be installed in pairs (in series, face-to-face or back-to-back). The rear codes are UA, UO and UL.
.UA-There is a small axial clearance when the bearings are installed face-to-face or back-to-back.
.UO-There is no play when the bearings are installed face to face or back to back.
UL-Slight pre-interference when the bearings are installed face to face or back to back. For example, B7004.TPA.P4.K5.UL means angular contact ball bearings with a contact angle of 15 degrees for spindles, phenolic laminated cloth tube straight pocket solid cages, outer ring guidance, bearing tolerance class 4, inner diameter and outer diameter The diameter tolerance is reduced, and the universal structure is installed in pairs. The bearings have a slight pre-interference when they are installed back to back or face to face.
(12) Lubrication
L..- Grease. Example: L64=Arcanol brand naji saponified fat.
L9..-Lubricating oil.
(13) Packaging
KS-sheet metal container packaging.