Do You Know The Basic Code Meaning Of FAG Bearings?

The basic code indicates the basic type, structure and size of FAG bearings.

The front code means that FAG bearing parts are placed before the basic code.

The post code indicates the supplementary code added after the basic code of the bearing when the FAG bearing structure shape, size, seal, cage, tolerance, clearance, heat treatment, packaging, technical requirements, etc. are changed.

See the table below for the arrangement rules of FAG bearing codes.

The basic composition of FAG bearing code

Rolling FAG bearing code

The basic composition of rolling FAG bearing code

Rolling FAG bearing code-prefix

Rolling FAG bearing code-suffix

——Pre-code

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

GS.——Thrust cylindrical roller FAG bearing race. Example: GS.81112.

K.——The combination of rolling element and cage. Example: Thrust cylindrical roller and cage assembly 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.81112.

——Internal Design

——Dimensions and deformation design

--special design

——FAG bearing for machine tool spindle

--seal

——Cage

--tolerance

-Clearance

——Heat treatment

——Low noise and province FAG bearing

——Post code

The post code is placed after the basic code. When there are multiple sets of post codes, they should be arranged from left to right in the order of the post codes listed in the FAG bearing code table. Some postcodes are separated from the basic code with a small dot in front of them.

Post code-internal structure

A, B, C, D, E-internal structure changes

Example: Angular contact ball FAG bearings 7205C, 7205E, 7205B, C-15° contact angle, E-25° antenna angle, B-40° contact angle.

Example: Cylindrical roller, spherical roller and thrust spherical roller FAG bearings N309E, 21309E, 29412E-enhanced design, FAG bearing load capacity is improved.

VH-Full complement cylindrical roller FAG bearings with self-locking rollers (the diameter of the complex circle of the rollers is different from the standard FAG bearings of the same model).

Example: NJ2312VH.

Post code-FAG bearing dimensions and external structure

DA-separable double row angular contact ball FAG bearing with double half inner ring. Example: 3306DA.

DZ-FAG roller bearing with cylindrical outer diameter. Example: ST017DZ.

K-FAG bearing with tapered bore, taper 1:12. Example: 2308K.

K30-taper bore FAG bearing, taper 1:30. Example: 24040K30.

2LS-Double row cylindrical roller FAG bearings with dust caps on both sides of the double inner ring. Example: NNF5026VC.2LS.V-internal structure change, double inner ring, dust cover on both sides, full complement 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 holes in the outer ring. Example: 23040S. S is not marked for spherical roller FAG bearings with bearing outer diameter D≥320mm.

X——The external dimensions meet the requirements of international standards. Example: 32036X

Z••——Technical conditions of special structure. Arranged downwards from Z11. Example: Z15-stainless steel FAG bearing (W-N01.3541).

ZZ-Roller FAG bearing with two retaining rings to guide the outer ring.

Post code-sealing and dustproof

RSR-FAG bearing has a sealing ring on one side. Example: 6207RSR

.2RSR-FAG bearing with sealing rings on both sides. Example: 6202RSR.

ZR-FAG bearing with a dust cover on one side. Example: 6207ZR

.2ZRFAG bearing with dust cover on both sides. Example: 6202ZR

ZRN——FAG bearing has a dust cover on one side, and a stop groove on the outer ring on the other side. Example: 6207ZRN.

.2ZRN-FAG bearing with dust cover on both sides, with stop groove on the outer ring. Example: 6202ZRN.

1 Post code-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, guided by inner ring.

FBS——Steel solid cage, inner ring guide, with lubrication groove.

FH——Steel solid cage, after carburizing and quenching.

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 hole cage, after 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, guided by inner ring.

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 FAG 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 FAG bearing is shaft ring guide).

MBS-brass solid cage, inner ring guide, with lubrication groove.

MP-brass solid straight pocket cage.

MPA-brass solid straight pocket also retains frame, 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 layer tomb cloth pipe 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-type cage.

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 FAG bearing is shaft guide).

TVPB1-glass fiber reinforced polyamide solid window cage, shaft guide (thrust roller FAG bearing).

Stamping cage

J——Steel stamping cage.

JN-deep groove ball FAG bearing riveted cage.

Cage changes

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.

Post code-FAG bearing without cage

V——Full complement of rolling element FAG bearings. Example: NU207V.

VT——Full complement rolling element FAG bearing with isolated balls or rollers. Example: 51120VT.

Post code-tolerance level (dimensional accuracy and rotation accuracy)

P0——The tolerance level is in line with the 0 level specified by the international standard ISO, and the code is omitted and not indicated.

P6-Tolerance level conforms to the level 6 specified by the international standard ISO.

P6X-Tolerance class 6 tapered roller FAG bearings in accordance with the international standard ISO regulations.

P5——The tolerance level is in line with the level 5 specified by the international standard ISO.

P4——The tolerance level is in line with the level 4 specified by the international standard ISO.

P2——The tolerance level is in line with the level 2 specified by the international standard ISO (excluding tapered roller FAG bearings).

SP——The dimensional accuracy is equivalent to level 5, and the rotation accuracy is equivalent to level 4 (double row cylindrical roller FAG bearings).

UP——The dimensional accuracy is equivalent to level 4, and the rotation accuracy is higher than level 4 (double row cylindrical roller FAG bearings).

HG——The dimensional accuracy is equivalent to level 4, and the rotation accuracy is higher than level 4 and lower than level 2 (spindle FAG bearing).

2 Post code-clearance

C1——The clearance meets the standard requirement of 1 group, less than 2 groups.

C2——The clearance meets the standard 2 groups, less than 0 group.

C0——Clearance conforms to the 0 group specified by the standard, omitted in the code, not indicated.

C3——The clearance meets the 3 groups specified by the standard, and is greater than 0 group.

C4——The clearance conforms to the 4 groups specified by the standard, and is greater than 3 groups.

C5——The clearance meets the 5 groups specified by the standard, and is greater than 4 groups.

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 FAG bearing tolerance grade P6, radial clearance 3 groups.

P52=P5+C2, which means FAG bearing tolerance grade P5, radial clearance 2 groups.

Non-standard clearance, in the case of special radial clearance and axial clearance, the relevant limit value should be expressed in μm after the letter R (radial clearance) or A (axial clearance), and the number is Use small dots to separate the spaces.

Example: 6210.R10.20-6210FAG bearing, radial clearance 10μm to 20μm.

6212.A120.160——6212FAG bearing, the axial clearance is 120μm to 160μm.

3 Post code-FAG bearing for testing noise

F3-low noise FAG bearing. Mainly refers to cylindrical roller FAG bearings and deep groove ball FAG bearings with inner diameter d>60mm. Example: 6213.F3.

G-low noise FAG bearing. Mainly refers to the deep groove ball FAG bearing with inner diameter d≤60mm. Example: 620G

Post code-heat treatment

S0-FAG bearing ring has been subjected to high temperature tempering treatment, and the working temperature can reach 150℃.

S1-FAG bearing ring has been subjected to high temperature tempering treatment, and the working temperature can reach 200℃.

S2-FAG bearing ring has been subjected to high temperature tempering treatment, and the working temperature can reach 250℃.

S3-FAG bearing ring has been subjected to high temperature tempering treatment, and the working temperature can reach 300℃.

S4-FAG bearing ring has been subjected to high temperature tempering treatment, and the working temperature can reach 350℃.

4 Post code-special technical conditions

F••——Sequentially numbered manufacturing technical conditions. Example: F80-FAG bearing inner and outer diameter tolerance and radial clearance compression.

K••——Sequentially numbered inspection technical conditions. Example K5-FAG bearing inner and outer diameter tolerance compression.

.ZB-cylindrical roller with convexity with a diameter greater than 80mm. Example: NU364.ZB.

.ZB2——The convexity at both ends of the needle 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•••——The technical conditions of consecutive numbers starting with 700000.

Z52JN.790144-FAG 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 service temperature can exceed 270℃.

5 Post code-special technical conditions

KDA——Splitinnerring/; Split inner ring

K-Taperedbore taper hole 1:12

K30-Taperedbore taper hole 1:30

N——circularintheouterringforsnapring

S-Lubricatinggrooveandboresintheouterring

The "S" suffix has been cancelled in the new E1 series! The outer ring oil groove and oil hole have now become standard equipment.

6 Post code-paired bearings and machine tool spindle FAG 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 FAG bearings are installed in pairs to withstand 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 withstand 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 spacers between the inner and outer rings are installed in pairs to withstand unidirectional axial load.

K10-Two sets of tapered roller FAG 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 FAG bearings with spacers between the outer rings are installed face to face without clearance (X-type installation).

We have all the type  FAG bearings， Partial bearing show: