Summary of the Meaning of FAG Bearing Suffixes

FAG's bearing code consists of a basic code, a prefix code and a suffix code. The basic code indicates the basic type structure and size of the bearing. The prefix code indicates that the bearing parts are placed before the basic code. The suffix code indicates that the supplementary code is added after the basic code of the bearing when there are changes in the bearing structure shape, size, seal, cage, tolerance, clearance, heat treatment, packaging, technical requirements, etc.

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

GS - thrust cylindrical roller bearing race. Example: GS. 81112

K - combination of rolling element and cage. Example: K.81108, combination of thrust cylindrical roller and cage.

R - bearing without separable inner ring or outer ring. Example: RNU207 - NU207 bearing without inner ring.

WS - thrust cylindrical roller bearing shaft ring. Example: WS. 81112.

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

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, bearing load capacity is improved.

VH-roller self-locking full roller cylindrical roller bearing (roller complex diameter is different from the standard bearing of the same model). Example: NJ2312VH

DA - separable double row angular contact ball bearing with double semi-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 changes, double inner ring, dust cover on both sides, full roller double row cylindrical roller bearing.

N - Bearing with retaining groove on the outer ring. Example: 6207N.

NR - Bearing with retaining groove and retaining ring on the outer ring. Example: 6207NR.

N2 - Four-point contact ball bearing with two retaining grooves on the outer ring. Example: QJ315N2.

S - Bearing with lubricating oil groove and three lubricating oil holes on the outer ring. Example: 23040. Spherical roller bearings with bearing outer diameter D greater than or equal to 320 mm are not marked with S.

X - External dimensions meet the requirements of international standards. Example: 32036X.

Z.. - Technical conditions for special structures. Arranged from 211 downwards. Example: 215-Stainless steel bearing (W-N01.3541).

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

RSR - Bearing with a sealing ring on one side. Example: 6207RSR.

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

2ZR - bearing with sealing covers on both sides. Example: 62072ZR.

ZRN - bearing with dust cover on one side and retaining groove on the outer ring on the other side. Example: 6207ZRN.

2ZRN - bearing with dust cover on both sides and retaining groove on the outer ring. Example: 62072ZRN.

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, rolling element guided.

FA - Steel solid cage, outer ring guided.

FAS - Steel solid cage, outer ring guided, with lubrication groove.

FB - Steel solid cage, inner ring guided.

FBS - Steel solid cage, inner ring guided, 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 guided.

FPPB - Steel solid window cage, inner ring guided.

FV, FV1 - Steel solid window hole cage, aging and tempering.

L - Light metal solid cage, rolling element guided.

LA - Light metal solid cage, outer ring guided.

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 cage.

MPA - Brass solid straight pocket cage, outer ring guide.

MPB - Brass solid straight pocket cage, inner ring guide.

T - Phenolic laminated cloth tube solid cage, rolling element guide.

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 cage, inner ring guide.

TP - Phenolic laminated cloth tube straight pocket cage.

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 molded cage, rolling element guided, with additional numbers to indicate different materials.

TNH - Engineering plastic self-locking pocket hole type cage.

TV - Glass fiber reinforced polyamide solid cage, steel ball guided.

TVH - Glass fiber reinforced polyamide self-locking pocket hole type solid cage, steel ball guided.

TVP - Glass fiber reinforced polyamide window type solid cage, steel ball guided.

TVP2 - Glass fiber reinforced polyamide solid cage, roller guided.

TVPB - Glass fiber reinforced polyamide solid cage, inner ring guided (thrust roller bearing is shaft guided).

TVPB1 - Glass fiber reinforced polyamide solid window type cage, shaft guided (thrust roller bearing).

2) Stamped cage

J - Stamped steel cage.

JN - Riveted cage for deep groove ball bearings.

3) 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 numbers are only used in the transition period, for example: NU1008M1.

(4) Bearings without cage

V - Full complement rolling element bearing. For example: NU207V.

VT - Full complement rolling element bearing with isolation balls or rollers. For example: 51120VT.

(5) Tolerance grade (including dimensional accuracy and rotational accuracy)

PO - Tolerance grade meets the international standard ISO 0, omitted in the code and not indicated.

P6 - Tolerance grade meets the international standard ISO 6.

P6X - Tolerance grade meets the international standard ISO 6X tapered roller bearing.

P5 - Tolerance grade meets the international standard ISO 5.

P4 - Tolerance grade complies with the international standard ISO specified level 4.

P2 - Tolerance grade complies with the international standard ISO level 2 (excluding tapered roller bearings).

SP - Dimensional accuracy is equivalent to level 5, rotation accuracy is equivalent to level 4 (double-row cylindrical roller bearings).

UP - Dimensional accuracy is equivalent to level 4, 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 bearings).

(6) Clearance

C1 - Clearance meets the standard requirements for Group 1, less than Group 2.

C2 - Clearance meets the standard requirements for Group 2, less than Group 0.

CO - Clearance meets the standard requirements for Group 0, omitted in the code and not indicated.

C3  - Clearance meets the standard requirements for Group 3, greater than Group 0.

C4 - Clearance meets the standard requirements for Group 4, greater than Group 3.

C5 - Clearance meets the standard requirements for Group 5, greater than Group 4.

1) When the tolerance grade code and the clearance code need to be indicated at the same time, the tolerance grade code (PO grade is not indicated) plus the clearance group code (0 group is not indicated) are used to indicate the combination.

Example: P63=P6+C3, indicating that the bearing tolerance grade is P6 and the radial clearance is Group 3.

2) Non-standard clearance, when special radial clearance and axial clearance are required, the relevant limit value should be expressed in microns after the letter R (radial clearance) or A (axial clearance), and the numbers should be separated by small dots.

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

(7) Bearings tested for noise

F3 - Low noise bearings. Mainly refers to cylindrical roller bearings and deep groove ball bearings with inner diameter d greater than 60 mm. Example: 6213.F3.

G - Low noise bearings. Mainly refers to deep groove ball bearings with inner diameter d less than or equal to 60 mm. Example: 6207.G.

(8) Heat treatment

SO - Bearing rings are subjected to high temperature tempering treatment, and the operating temperature can reach 150 degrees Celsius.

S1 - Bearing rings are subjected to high temperature tempering treatment, and the operating temperature can reach 200 degrees Celsius.

S2 - Bearing rings are subjected to high temperature tempering treatment, and the operating temperature can reach 250 degrees Celsius.

S3 - Bearing rings are subjected to high temperature tempering treatment, and the operating temperature can reach 300 degrees Celsius.

S4 - Bearing rings are subjected to high temperature tempering treatment, and the operating temperature can reach 350 degrees Celsius.

(9) Special technical conditions

F.. - Manufacturing technical conditions with consecutive numbers. Example: F80-bearing inner and outer diameter tolerances and radial clearance compression.

K.. - continuously numbered inspection technical conditions. Example: K5-bearing inner and outer diameter tolerance compression.

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

.ZB2 - the convexity of 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...continuously numbered technical conditions starting with 700000.

Z52JN. 790144 - bearings can be used at high temperatures and low speeds, with special heat treatment, steel plate stamping and riveting cages, large clearance, phosphating treatment, grease injection, and the operating temperature can exceed 270 degrees Celsius.

Z52JN. 790191 - bearings can be used at high temperature and low speed, after special heat treatment, steel plate stamping riveted cage, large clearance, phosphating treatment, grease injection, the use temperature can reach 270 degrees Celsius.

(10) Paired bearings

1) Paired bearings that meet the 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 bear unidirectional axial loads.

K2 - Two sets of deep groove ball bearings are installed in pairs to bear bidirectional axial loads.

K3 - Two sets of deep groove ball bearings are installed back to back without clearance (0-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 loads.

K7 - Two sets of angular contact ball bearings are installed back to back without clearance (0-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 bear unidirectional axial loads.

K10 - Two sets of tapered roller bearings with spacers between the inner and outer rings are installed back to back without clearance (type 0 installation).

K11 -Two sets of tapered roller bearings with a spacer between the outer rings are installed face to face without clearance (X-type installation).

Bearings arranged in pairs or groups need to be delivered together with packaging or marked as belonging to a pair. Bearings in different groups are not interchangeable. When installing bearings belonging to the same group, the installation should be carried out according to the markings and positioning. If each pair of bearings is arranged according to a certain axial or radial clearance, its clearance should be indicated after the K technical conditions according to item 1, 2) in (7). For example, 31314A. K11. A100.140 means two sets of 31314A single-row tapered roller bearings, installed face to face, with a certain distance between the outer rings, the axial clearance of the bearings before assembly is between 100 microns and 140 microns, and the clearance is zero after assembly.

2) Universal matching bearings, which can be matched and installed in any way (in series, face to face or back to back), with the suffix codes UA, UO and UL.

UA - There is a small axial clearance when the bearings are matched or installed back to back.

UO - No clearance when the bearings are matched or installed back to back.

UL - There is a 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 cage, outer ring guide, bearing tolerance grade 4, reduced inner and outer diameter tolerances, universal structure for installation in pairs, and there is a slight pre-interference when the bearings are installed back to back or face to face.

(11) Lubrication

L.. - Grease. Example: L64-Arcanol brand sodium saponified grease.

L9.. - Lubricating oil.

(12) Packaging

KS - Metal plate container packaging.

If you have other FAG bearing questions, please contact alita@sgsabearing.com