Self Lubricating Rod End Plain Bearing
Self Lubricating Rod End Plain Bearing
2021年12月11日
Selection Of Rolling Bearing Type
Selection Of Rolling Bearing Type
2021年12月11日

Basic Code Meaning Of FAG Bearing

It is composed of basic code, pre code and post code. The basic code indicates the basic type, structure and size of fag bearing. The leading code indicates that fag bearing parts are placed before the basic code. The post code refers to the supplementary code added after the basic code of fag bearing when the structural shape, size, seal, cage, tolerance, clearance, heat treatment, packaging, technical requirements, etc. of fag bearing are changed.

 

The arrangement rules of fag bearing codes are shown in the table below.

Basic composition of fag bearing code
Code of rolling fag bearing
Basic composition of rolling fag bearing code
Rolling fag bearing code – prefix
Rolling fag bearing code suffix

——Prefix code

The front code R is directly placed before the basic code of fag bearing, and the other codes are separated from the basic code by small dots.

GS.—— Thrust cylindrical roller fag bearing race. Example: GS 81112。
K. – assembly of rolling element and cage. Example: assembly of thrust cylindrical roller and cage k.81108
R – fag bearing without separable inner ring or outer ring. Example: rnu207 – fagnu207 bearing without inner ring.
Ws – thrust cylindrical roller fag bearing shaft ring. Example: WS eighty-one thousand one hundred and twelve
——Internal design
——Overall dimension and deformation design
——Sealing
——Cage
——Tolerance
——Clearance
——Heat treatment
——Special design
——Machine tool spindle fag bearing
——Low noise fag bearing
——Post code

The post code is placed after the basic code. When there are multiple groups of post codes, they shall be arranged from left to right in the order of post codes listed in fag bearing code table. Some post codes are separated from the basic code by small round dots.

Post code – internal structure
A. B, C, D, e – internal structure change
Example: angular contact ball fag bearings 7205C, 7205e, 7205b, C-15 ° contact angle, E-25 ° contact angle, B-40 ° contact angle.
For example: cylindrical roller, self-aligning roller and thrust self-aligning roller fag bearings n309e, 21309e and 29412e – enhanced design, and the load capacity of fag bearing is improved.
VH – roller self-locking full loaded cylindrical roller fag bearing (the diameter of the roller is different from the standard fag bearing of the same model).
Example: nj2312vh.
Post code – overall dimension and external structure of fag bearing
Da — separable double row angular contact ball fag bearing with double half inner ring. Example: 3306da.
DZ – roller fag bearing with cylindrical outer diameter. Example: st017dz.
K – fag bearing with tapered hole, taper 1:12. Example: 2308k.
K30 tapered hole fag bearing, taper 1:30. Example: 24040k30.
2LS – double row cylindrical roller fag bearing with dust cover on both sides of double inner ring. Example: nnf5026vc 2LS. V – internal structure change, double inner rings, dust cover on both sides, full roller double row cylindrical roller fag bearing.
N – fag bearing with stop groove on the outer ring. Example: 6207n.
NR – fag bearing with stop groove and stop ring on the outer ring. Example: 6207nr.
N2 – four point contact ball fag bearing with two stop grooves on the outer ring. Example: qj315n2.
S – fag bearing with lubricating oil groove and three lubricating oil holes on the outer ring. Example: 23040s. S is not marked for self-aligning roller fag bearings with bearing outer diameter D ≥ 320mm.
X – the overall dimension shall comply with the provisions of international standards. Example: 32036x
Z •• – technical conditions of special structures. Arrange downward from Z11. Example: z15 – stainless steel fag bearing (w-n01.3541).
ZZ – retaining ring of roller fag bearing with two outer rings.
Post code – sealing and dustproof
RSR – one side of fag bearing is provided with sealing ring. Example: 6207rsr
. 2rsr – fag bearing with sealing ring on both sides. Example: 6202rsr
Zr – one side of fag bearing is provided with dust cover. Example: 6207zr
. 2zrfag bearing is provided with dust cover on both sides. Example: 6202zr
ZrN – fag bearing is provided with dust cover on one side and stop groove on the outer ring on the other side. Example: 6207zrn.
. 2zrn – fag bearing with dust cover on both sides and stop groove on the outer ring. Example: 6202zrn.

Basic Code Meaning Of FAG Bearing
1. Rear code – cage and its material: solid cage.

A or B is placed after the cage code. A indicates that the cage is from the outer ring and B indicates that the cage is from the inner ring.
F – steel solid cage, rolling element.
Fa – steel solid cage, outer ring.
Fas – steel solid cage, outer ring, with lubrication groove.
FB – steel solid cage, inner ring.
FBS – steel solid cage, inner ring, with lubrication groove.
FH – steel solid cage, carburized and quenched.
H. H1 — carburized and quenched cage.
FP – steel solid window cage.
FPA – steel solid window cage, outer ring.
FPB – steel solid window cage, inner ring.
FV, Fv1 – steel solid window hole cage, aged, Quenched and tempered.
L – light metal solid cage, rolling element.
La — light metal solid cage, outer ring.
Las – light metal solid cage, outer ring, with lubrication groove.
LB — light metal solid cage, inner ring.
Lbs – light metal solid cage, inner ring, with lubrication groove.
LP – light metal solid window cage.
LPA – light metal solid window cage, outer ring.
LPB – light metal solid window cage, inner ring (thrust roller fag bearing is shaft).
M. M1 – Brass solid cage.
Ma – Brass solid cage, outer ring.
MAS – Brass solid cage, outer ring, with lubrication groove.
MB – Brass solid cage, inner ring (thrust self-aligning roller fag bearing is shaft ring).
MBS – Brass solid cage, inner ring, with lubrication groove.
MP – Brass solid straight pocket cage.
MPA – Brass solid straight pocket cage, outer ring.
MPB – Brass solid straight pocket cage, inner ring.
T — phenolic laminated cloth pipe solid cage, rolling element.
Ta – phenolic laminated pipe solid holder, outer ring.
TB – phenolic laminated cloth pipe solid cage, inner ring.
THB – phenolic laminated cloth pocket hole cage, inner ring.
TP — straight pocket holder of phenolic layer grave cloth pipe.
TPA – phenolic laminated cloth pipe straight pocket cage, outer ring.
TPB – phenolic laminated cloth pipe straight pocket cage, inner ring.
TN — engineering plastic injection cage, rolling element, different materials are represented by additional numbers.
TnH – engineering plastic self-locking pocket hole cage.
TV – glass fiber reinforced polyamide solid cage, steel ball.
TVH – glass fiber reinforced polyamide self-locking pocket hole solid cage, steel ball.
TVP – glass fiber reinforced polyamide window type solid cage, steel ball.
Tvp2 – glass fiber reinforced polyamide solid cage, roller.
Tvpb – glass fiber reinforced polyamide solid cage, inner ring (thrust roller fag bearing is shaft).
Tvpb1 – glass fiber reinforced polyamide solid window cage, shaft (thrust roller fag bearing).
Stamping cage
J – steel plate stamping cage.
Jn – riveted cage of deep groove ball fag bearing.

 
Cage change

The number added after the cage code or inserted in the middle of the cage code indicates that the cage structure has changed. These figures are only used for the transition period, for example: nu1008m1.
Post code – cage free fag bearing
V – fully loaded rolling element fag bearing. Example: nu207v.
Vt – full loaded rolling element fag bearing with isolation ball or roller. Example: 51120vt.
Post code – tolerance class (dimensional accuracy and rotation accuracy)
P0 — the tolerance grade conforms to grade 0 specified in the international standard ISO, which is omitted in the code and does not indicate.
P6 – the tolerance grade conforms to grade 6 specified in the international standard ISO.
P6x – grade 6 tapered roller fag bearing with tolerance grade conforming to international standard ISO.
P5 – the tolerance grade conforms to grade 5 specified in the international standard ISO.
P4 – the tolerance grade conforms to grade 4 specified in the international standard ISO.
P2 – the tolerance grade conforms to grade 2 specified in the international standard ISO (excluding tapered roller fag bearing).
Sp – the dimensional accuracy is equivalent to grade 5, and the rotation accuracy is equivalent to grade 4 (double row cylindrical roller fag bearing).
Up — the dimensional accuracy is equivalent to grade 4, and the rotation accuracy is higher than grade 4 (double row cylindrical roller fag bearing).
Hg — the dimensional accuracy is equivalent to grade 4, and the rotation accuracy is higher than grade 4 and lower than grade 2 (main shaft fag bearing).
2 post code – clearance
C1 – one group with clearance conforming to the standard, less than two groups.
C2 – 2 groups with clearance conforming to the standard, less than 0 group.
C0 – group 0 with clearance conforming to the standard, omitted from the code and not indicated.
C3 – 3 groups with clearance conforming to the standard, greater than 0 group.
C4 – 4 groups with clearance conforming to the standard, greater than 3 groups.
C5 – 5 groups with clearance conforming to the standard, greater than 4 groups.

 

When the tolerance grade code and clearance code need to be expressed at the same time, the combination of tolerance grade code (not represented by grade P0) and clearance group number (not represented by group 0) is used.
Example: p63 = P6 + C3, indicating fag bearing tolerance grade P6, radial clearance 3 groups.
P52 = P5 + C2, indicating fag bearing tolerance grade P5 and radial clearance 2 groups.
Non standard clearance. When special radial clearance and axial clearance are required, the relevant limit value shall be used after the letter R (radial clearance) or a (axial clearance) μ M number indicates that the numbers should be separated by small round dots.
Example: 6210 R10. 20-6210fag bearing, radial clearance 10 μ M to 20 μ m。
6212.A120. 160 – 6212fag bearing, axial clearance 120 μ M to 160 μ m。
3 post code – fag bearing for testing noise
F3 – low noise fag bearing. It mainly refers to cylindrical roller fag bearing and deep groove ball fag bearing with inner diameter d > 60mm. Example: 6213 F3。
G – low noise fag bearing. It mainly refers to deep groove ball fag bearing with inner diameter D ≤ 60mm. Example: 620g
Post code – heat treatment
S0 – fag bearing ring is tempered at high temperature, and the working temperature can reach 150 ℃.
S1 – fag bearing ring is tempered at high temperature, and the working temperature can reach 200 ℃.
S2 – fag bearing ring is tempered at high temperature, and the working temperature can reach 250 ℃.
S3 – fag bearing ring is tempered at high temperature, and the working temperature can reach 300 ℃.
S4 – fag bearing ring is tempered at high temperature, and the working temperature can reach 350 ℃.
4 post code – special technical conditions
F •• – manufacturing technical conditions of consecutive numbers. Example: F80 – fag bearing inner and outer diameter tolerance and radial clearance compression.
K •• – continuously numbered inspection technical conditions. Example K5 – fag bearing inner and outer diameter tolerance compression.
. ZB — cylindrical roller with convexity with diameter greater than 80mm. Example: nu364 ZB。
. ZB2 – the convexity at both ends of the needle roller is greater than the general technical requirements. Example: K18 × twenty-six × 20F. ZB2.
ZW – double row needle roller and cage assembly. Example: K20 × twenty-five × 40FZW。
. 700 •• – technical conditions of consecutive numbers beginning with 700000.
Z52JN. 790144 – fag bearing can be used for high temperature and low speed. After special heat treatment, steel plate stamping and riveting cage, large clearance, phosphating treatment and grease injection, the service temperature can exceed 270 ℃.

5. post code – special technical conditions
KDA——Splitinnerring/; Split inner ring
K — taper hole of taperedbore 1:12
K30 taperedbore tapered hole 1:30
N——circularintheouterringforsnapring
S——Lubricatinggrooveandboresintheouterring
The suffix “s” has been completely cancelled in the new E1 series! The outer ring oil filling groove and oil hole have become standard configuration.

6. post code – paired bearing and machine tool spindle fag bearing
1) For paired bearings that meet the technical conditions of K, the following special technical conditions are related to paired bearings:
K1 – two sets of deep groove ball fag bearings are installed in pairs to bear unidirectional axial load.
K2 – two sets of deep groove ball fag bearings are installed in pairs to bear bidirectional axial load.
K3 – two sets of deep groove ball fag bearings are installed back-to-back without clearance (O-type installation).
K4 – two sets of deep groove ball fag bearings are installed face to face without clearance (X-type installation).
K6 – two sets of angular contact ball fag bearings are installed in pairs to bear unidirectional axial load.
K7 – two sets of angular contact ball fag bearings are installed back-to-back without clearance (O-type installation).
K8 – two sets of angular contact ball fag bearings are installed face to face without clearance (X-type installation)
K9 – two sets of tapered roller fag bearings with spacer between inner and outer rings are installed in pairs to bear unidirectional axial load.
K10 – two sets of tapered roller fag bearings with spacer between inner and outer rings shall be installed back-to-back without clearance (O-type installation)
K11 – two sets of tapered roller fag bearings with spacer ring between outer rings shall be installed face to face without clearance (X-type installation).

Fag bearings configured in pairs or groups need to be packaged and delivered together, or marked as belonging to a pair. Fag bearings of different groups are not interchangeable. When installing the bearings belonging to the same group, the installation shall be carried out according to the mark and positioning line. If each pair of fag bearings is configured according to a certain axial or radial clearance, the clearance shall be indicated according to Article 1 (2) in Item (7) after technical conditions K. For example, 31314a K11. A100. 140 refers to two sets of 31314a single row tapered roller fag bearings, which are installed face to face, with a certain distance spacer between the outer rings, and the axial clearance before bearing assembly is 100 μ M to 140 μ M, the clearance is zero after assembly.

7. universal matched fag bearing
It can be installed in any pair (series, face-to-face or back-to-back), and the rear code is UA, uo and UL.
. UA – small axial clearance when fag bearing is installed face-to-face or back-to-back.
. Uo – no clearance when fag bearing is installed face to face or back to back.
. Ul – slight pre interference when fag bearing is installed face-to-face or back-to-back. For example, b7004c TPA. P4. K5. UL
It refers to the angular contact ball fag bearing with a contact angle of 15O for the main shaft, phenolic laminated cloth pipe straight pocket solid cage, outer ring, bearing tolerance grade 4, reduced inner and outer diameter tolerances, general structure installed in pairs, FAG bearing has slight pre interference when installed back-to-back or face-to-face

8. post code – fag bearing of machine tool spindle
KTPA. Hg cloth clamping and delivery pocket solid cage, outer ring, accuracy grade Hg. TPA. HG. K5. UL clamping cloth is handed over to this pocket solid cage, outer ring, accuracy grade Hg, FAG bearing outer diameter and inner diameter tolerance are reduced, the whole body structure is installed in pairs, and fag bearings are installed face-to-face or back-to-back with slight pre interference.
TPA. P2. K5. UL clamping cloth is handed over to this pocket solid cage, outer ring, accuracy grade Hg, FAG bearing outer diameter and inner diameter tolerance are reduced, the whole body structure is installed in pairs, and fag bearings are installed face-to-face or back-to-back with slight pre interference.
TPA. P2ul clamping cloth is handed over to this pocket solid cage, outer ring, accuracy grade Hg, FAG bearing outer diameter and inner diameter tolerance are reduced, the whole body structure is installed in pairs, and fag bearing is slightly pre interference installed face-to-face or back-to-back.
Post code – fag bearing of machine tool spindle

TPA. P2. K5. UL cloth clamping and cross pocket solid cage, outer ring, accuracy grade Hg, general structure installed in pairs, FAG bearing has slight pre interference in face-to-face or back-to-back installation.
Ccoulactangle / contact angle 15 “C.
Dcoulactangle / contact angle 25 “C.
P4StoeranceclassP4S。