FAG bearing designation | nomenclature | prefix | suffix

Each FAG bearing has a designation that clearly indicates the type, dimensions, tolerances and internal clearance. The FAG bearing nomenclature consist of prefix, designation, and suffix. The basic FAG bearing number indicates the FAG bearing type and width and diameter. Prefix and suffix of FAG bearing identify cage styles, seal types, internal clearances, etc.

FAG bearings that have the same standardised designation are interchange­able with each other. In the case of separable bearings, it cannot always be ensured that individual parts with the same origin can be interchanged with each other. In Germany, the FAG bearing designations are standardised in DIN 623-1. These designations are also used in many other countries. Please refer to SKF bearing designation.

FAG bearing designation is identified as the table below:

Prefix Basic FAG bearing number Suffix

The basic designation of FAG bearing

The designation for the FAG bearing series comprises numbers and letters or letters and numbers. It indicates the type of FAG bearing, the diameter series and, in many cases, the width series too. The basic designation contains the symbols for the FAG bearing series and the bearing bore.

The basic designation of FAG bearing

The code of FAG bearing type

  • 0: Double row angular contact ball bearing
  • 1: Self-aligning ball bearing
  • 2: Spherical roller bearing, spherical roller thrust bearing
  • 3: Tapered roller bearing
  • 4: Double row deep groove ball bearing
  • 5: Axial deep groove ball bearing
  • 6: Single row deep groove ball bearing
  • 7: Single row angular contact ball bearing
  • 8: Axial cylindrical roller bearing
  • C: Toroidal roller bearing
  • N: Single row cylindrical roller bearing
  • NN: Double row cylindrical roller bearing
  • QJ: Four point contact bearing

The diameter and width series

Width and diameter series are described using numbers. In the case of radial bearings in accordance with DIN 616 and ISO 15, these are as follows:

  • For width series, the numbers 8, 9, 0, 1, 2, 3, 4, 5, 6, 7
  • For the designation of diameter series, the numbers 7, 8, 9, 0, 1, 2, 3, 4, 5

Dimension series for FAG radial bearings (excluding tapered roller and needle roller bearings)

Width series – increase in cross-sectional width
  8 9 0 1 2 3 4 5 6 7
Diameter series – increase in cross-sectional height 5 - - - - - - - - - -
4 - - 04 - 24 - - - - -
3 83 - 03 12 23 33 - - - -
2 82 - 02 12 22 32 42 52 62 -
1 - - 01 11 21 31 41 51 61 -
0 - - 00 10 20 30 40 50 60 -
9 - - 09 19 29 39 49 59 69 -
8 - - 08 18 28 38 48 58 68 -
7 - - - 17 27 37 47 - - -

The FAG bearing bore code

The FAG bearing bore code
The bore code is derived from the diameter d of the FAG bearing bore; with a factor of 5 or the addition of an oblique.

For d < 10 mm, the bore diameter is stated in the basic designation

For certain FAG bearing types, the bearing bores are stated directly or in an encoded form in accordance with DIN 623-1. Up to d < 10 mm, the bearing bore diameter is specified in the dimension-specific part of the designation (basic designation) directly as a number indicating the diameter.

For example: FAG deep groove ball bearing 608, bore diameter = 8mm.

The bore code describes the FAG bearing bore from d ≧ 10 mm

For nominal dimensions d ≧ 10 mm to d < 500 mm, the diameter is described by means of a bore code.

For bores from 10 mm to 17 mm, the following applies:

d = 10 mm, bore code 00
d = 12 mm, bore code 01
d = 15 mm, bore code 02
d = 17 mm, bore code 03.

For all FAG rolling bearings in the range from d = 20 mmto d = 480 mm (excluding double direction axial bearings), the bore code is formed by dividing the dimension of the bearing bore by 5.

For example: FAG 7314-B-TVP-UA Bearing, bore d = 70 mm divided by 5 (70:5), bore code = 14.

From d > 480 mm

From d > 480 mm, the unencoded bore diameter is given with an oblique after the bearing series, e.g. FAG 232/500-BEA-XL-MB1 bearing with bore diameter d = 500 mm.

Intermediate sizes

The intermediate sizes, such as bore diameter d = 22, 28 and d = 32 mm for example, are also given with an oblique as /22, /28 and /32.

Designations of FAG metric tapered roller bearings

Designation for FAG tapered roller bearings
The above figure describes as an example the structure of the designation for a FAG metric tapered roller bearing (dimension series to ISO 355, designation to ISO 10317). The 3 indicates the contact angle range. The first letter (F in this case) indicates a diameter series. Each diameter series has a certain ratio D/d (outside diameter to bore diameter). The second letter (E in this case) indicates a width series. Each width series has a certain ratio of bearing width T to the height of the bearing cross-section. The addition of the letter T (for tapered roller bearing) at the start and a three-digit number at the end for the bearing bore diameter in mm (in this case 120) gives the complete designation of a FAG tapered roller bearing.

FAG bearing prefix

The prefix normally identifies individual FAG bearing parts of complete bearings (in certain cases, this may also be part of the basic designation)

Prefix Description of prefix
GS Single part housing locating washer
K axial cylindrical roller and cage assembly
WS shaft locating washer
LS bearing washers, alternatively for shaft and housing locating washer

FAG bearing suffix

FAG deep groove ball bearing suffixes

Suffixes and corresponding descriptions, FAG single row deep groove ball bearings

Suffix Description of suffix
C Deep groove ball bearing, Generation C Standard
M Solid brass cage, ball-guided
MA Solid brass cage, guided on outer ring rib Available
by agreement
MB Solid brass cage, guided on inner ring rib
C2 Radial internal clearance C2 (smaller than normal) Available
by agreement
C3 Radial internal clearance C3 (larger than normal)
C4 Radial internal clearance C4 (larger than C3)
CM Radial internal clearance more closely toleranced
than normal
2BRS Non-contact seal on both sides (labyrinth seal) Standard
for Generation C
2HRS Contact seal on both sides (lip seal) Standard
for Generation C
2RSR Contact seal on both sides (lip seal) Standard
2RZ Non-contact seal on both sides
(rubberised gap seal)
Standard
2Z Non-contact sealing shield on both sides
(sheet metal gap seal) 
Standard
BRS Non-contact seal on one side (labyrinth seal) Available
by agreement
ELS Contact seal on one side (lip seal) Available
by agreement
for Generation C
2ELS Contact seal on both sides (lip seal) Available
by agreement
for Generation C
RSR Contact seal on one side (lip seal) Available
by agreement
RZ Non-contact seal on one side (rubberised gap seal) Available
by agreement
TVH Solid cage made from glass fibre reinforced polyamide PA66 Available
by agreement
Y Sheet brass cage Available
by agreement
Z Non-contact sealing shield on one side
(sheet metal gap seal)
Available
by agreement
S0 Dimensionally stabilised bearing
for operating temperatures up to +150 °C
Available
by agreement
S1 Dimensionally stabilised bearing
for operating temperatures up to +200 °C
Available
by agreement
S2 Dimensionally stabilised bearing
for operating temperatures up to +250 °C
Available
by agreement

Suffixes and corresponding descriptions, FAG double row deep groove ball bearings

Suffix Description of suffix
B Modified internal construction Standard
TVH Solid cage made from glass fibre reinforced polyamide PA66 Standard

FAG angular contact ball bearing suffixes

Suffixes and corresponding descriptions

Suffix Description of suffix
B Modified internal construction,
nominal contact angle α = 40°
Standard
JP Sheet steel cage Standard, dependent
on bore code
MP Solid brass cage
TVH, TVP Solid cage made from glass fibre reinforced polyamide PA66
P5 Bearing in tolerance class 5 Special design, available
by agreement
2RS Contact seal on both sides (lip seal) Standard
UA Universal design for fitting in pairs,
bearing pair has a small axial internal clearance
in O and X arrangement
UB Universal design for fitting in pairs,
bearing pair has a smaller axial internal clearance
in O and X arrangement than in UA
UH Universal design for fitting in pairs,
bearing pair has a high preload
in O and X arrangement
Available
by agreement
UL Universal design for fitting in pairs,
bearing pair has a light preload
in O and X arrangement
Standard
UM Universal design for fitting in pairs,
bearing pair has a moderate preload
in O and X arrangement
Available
by agreement
UO Universal design for fitting in pairs,
bearing pair is clearance-free
in O and X arrangement
Standard
XL X-life bearing, dependent on bore code and
bearing type
Standard

FAG four point contact bearing suffixes

Suffix Description of suffix
C2 Axial internal clearance C2
(smaller than normal)
Special design,
available by agreement
C3 Axial internal clearance C3
(larger than normal)
C4 Axial internal clearance C4
(larger than C3)
MPA Solid brass cage, guided on outer ring Standard,
cage material dependent on bearing series and bore code
TVP Solid cage made from
glass fibre reinforced polyamide PA66
XL X-life bearing Standard,
dependent on bore code and bearing type
N2 Two retaining slots in outer ring Standard for larger bearings

FAG self-aligning ball bearing suffixes

Suffix Description of suffix
C3 Radial internal clearance C3
(larger than normal)
Standard for bearings
with tapered bore
CN Radial internal clearance CN
(normal)
Special design for bearings
with tapered bore,
available by agreement
K Tapered bore Standard
M Solid brass cage Standard,
cage material dependent on bearing series and bore code
TVH Solid cage made from
glass fibre reinforced polyamide PA66
2RS Contact seal on both sides Dependent on bearing series

FAG cylindrical roller bearing suffixes

Suffix Description of suffix
C3 Radial internal clearance C3 (larger than normal) Available
by agreement
C4 Radial internal clearance C4 (larger than C3)
C5 Radial internal clearance C5 (larger than C4)
E Increased capacity design Standard
EX Increased capacity design, design modified
in accordance with standard (parts from these bearings must not be interchanged with parts from bearings
of the same size of the previous design E)
JP3 Sheet steel window cage, single-piece, roller-guided Available
by agreement
J30P Black oxide coated (Durotect B)
MPAX Solid brass cage, single-piece, rib-guided on outer ring
MPBX Solid brass cage, single-piece, rib-guided on inner ring
M1 Solid brass cage, two-piece, roller-guided Standard
M1A Solid brass cage, two-piece, rib-guided on outer ring Available
by agreement
M1B Solid brass cage, two-piece, rib-guided on inner ring
TB Bearing with increased axial loadcarrying capacity (toroidal crowned design) Standard, dependent on bearing size
TVP2 Solid window cage made from glass fibre reinforced polyamide PA66 Standard
XL X-life bearing

FAG tapered roller bearing suffixes

Suffix Description of suffix
A Modified internal construction (excluding bearings to ANSI/ABMA)
B Increased contact angle (for bearings to DIN)
DF-A..-.. Two tapered roller bearings matched in an X arrangement,
with an intermediate ring between the outer rings. Axial internal clearance between .. and .. in μm
X External dimensions matched to international standards
(for bearings to DIN)
XL X-life

FAG tapered roller bearing for special applications. Special designs, available by agreement

Suffix Description of suffix
DB-A..-.. Two tapered roller bearings matched in an O arrangement,
with an intermediate ring between the outer rings and the inner rings, axial internal clearance between .. and .. in μm
DT Two tapered roller bearings matched in a tandem arrangement,
with an intermediate ring between the outer rings
P5 Bearing in tolerance class 5

FAG barrel roller bearing suffixes

Suffix Description of suffix
C2 Radial internal clearance C2
(smaller than normal)
Special design,
available by agreement
C3 Radial internal clearance C3
(larger than normal)
Normally used for bearings
with tapered bore,
available by agreement
for bearings with cylindrical bore
C4 Radial internal clearance C4
(larger than C3)
Special design,
available by agreement
CN Radial internal clearance CN
(normal)
Standard for bearings
with cylindrical bore,
available by agreement
for bearings with tapered bore
K Tapered bore, taper 1:12 Standard
MB Solid brass cage, guided on inner ring Standard,
cage material dependent
on bore code
TVP Solid cage made from glass fibre
reinforced polyamide PA66

FAG spherical roller bearing suffixes

Suffix Description of suffix
A-MA,
AS-MA
Two brass cages,
guidance on outer ring, inner ring with two lateral retaining ribs and one central rib
Standard combinations
B-FB1  One steel cage,
guidance on inner ring, inner ring with two lateral retaining ribs and one central rib
BE-XL Two sheet steel cages,
surface hardened, guidance on inner ring, X-life
BE-XL-JPA Two sheet steel cages,
surface hardened, guidance on outer ring, X-life
BEA-XL-MB1 One brass double comb cage,
guidance on inner ring, inner ring with two lateral retaining ribs, X-life
E1-XL Two sheet steel cages,
surface hardened or coated, guidance on outer ring, X-life
E1-XL-TVPB Two window cages made from glass fibre reinforced polyamide, guidance on inner ring, X-life
E1A-XL-M One brass double comb cage,
guided by rollers, inner ring with two lateral retaining ribs, X-life
MB,
B-MB
Two brass cages,
guidance on inner ring, inner ring with two lateral retaining ribs and one central rib
MA1 One brass cage,
guidance on outer ring, inner ring with two lateral retaining ribs and one central rib
2RSR Contact seal (lip seal) on both sides with sheet steel reinforcement, made from nitrile rubber (NBR);
grease fill level 25% to 40%, filled with high pressure grease
Standard
2VSR Contact seal (lip seal) on both sides with sheet steel reinforcement, made from fluoro rubber (FKM);
grease fill level 60% to 100%, filled with high temperature grease
C2 Radial internal clearance C2 (smaller than normal) Available
by agreement
C3 Radial internal clearance C3 (larger than normal)
C4 Radial internal clearance C4 (larger than C3)
H40 Without lubrication groove and lubricationholes
H40CA 6 lubrication holes in the outer ring
H40AB 6 lubrication holes in the inner ring
H40AC 6 lubrication holes and one lubricationgroove
in the inner ring
H78(*) 3 uniformly distributed threaded holes in one end
face of the outer ring
(* weight-oriented module letter, please contact us)
H151 One 45° retaining slot in the outer ring
H151B One 15° retaining slot in the outer ring
K Tapered bore, taper 1:12
K30 Tapered bore, taper 1:30
P5 Dimensional and running accuracy in accordance
with ISO tolerance class 5
S Lubrication groove and lubrication holes in outer ring
SY 3 lubrication holes in the outer ring, no lubrication groove
T41A For oscillating load with restricted diameter tolerances, radial internal clearance C4
T41D For oscillating load with restricted diameter tolerances, radial internal clearance C4,
bore with thin chromium coating
W209B Inner ring made from case hardening steel
XL X-life bearing

FAG thrust ball bearing suffixes

FAG axial deep groove ball bearings suffixes

Suffix Description of suffix
MP Solid brass cage, ball-guided Standard
P5 Bearing in tolerance class 5 Special design,
available by agreement
P6 Bearing in tolerance class 6

FAG thrust roller bearing suffixes

FAG axial spherical roller bearings suffixes

Suffix Description of suffix
E1 Increased capacity design Standard
MB Solid brass cage
N1 One retaining slot
in the housing locating washer
N2 Two retaining slots offset by 180°
in the housing locating washer
THI 3 uniformly distributed threaded holes
in one end face of the shaft locating washer
THIE 3 uniformly distributed threaded holes
in one end face of the shaft locating washer,
incl. suitable eye bolts
THO 3 uniformly distributed threaded holes
in one end face of the housing locating washer
THOE 3 uniformly distributed threaded holes
in one end face of the housing locating washer,
incl. suitable eye bolts
XL X-life bearing

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