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1mm — 200mm
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Bearing Suffixes
The designations of most rolling bearings follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes. Suffixes identify designs or variants, which differ in some way from the original design or from the current basic design.
The designations of most rolling bearings follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes. Suffixes identify designs or variants, which differ in some way from the original design or from the current basic design.
| Suffixes | Meaning |
| A |
Deviating or modified internal design with same boundary dimensio ns. As a
rule the significance of the letter is bound to the particular bearing or bearing
series
|
| AC | Single row angular contact ball bearing with 25° contact angle |
| AS | Needle roller bearing with lubrication hole(s) in outer ring. A figure following the AS indicates the number of holes |
| ASR | Needle roller bearing with annular groove and lubrication hole(s) in outer ring. A figure following the ASR indicates the number of holes |
| A xxx | A combined with a two or three-figure number identifies variants of the standard design, which cannot be identified by generally applicable suffixes |
| B |
1. Deviating or modified internal design with same boundary dimensions.
As a rule the significance of the letter is bound to the particular bearing or
bearing series
2. Taper roller bearing to ABMA standard with external flange on outer ring |
| B xxx | B combined with a two or three-figure number identifies variants of the standard design, which cannot be identified by generally applicable suffixes Example: /B20 Reduced width tolerance |
| C |
1. Deviating or modified internal design with same boundary dimensions. As a rule the significance of the letter is bound to the particular bearing
2. Y-bearing with cylindrical outside diameter, e.g. YET 205 C |
| CA | 1. Spherical roller bearing of C design, but with retaining flanges on inner ring and machined cage 2. Single row angular contact ball bearing for universal pairing in back-toback, face-to-face or tandem arrangement. When arranged back-to-back or face-to-face there will be a slight axial clearance |
| CAB | Spherical roller bearing of CA design but with pierced rollers and pin-type cage |
| CABC | Spherical roller bearing of CAB design but with enhanced roller guidance and correspondingly reduced friction |
| CAC | Spherical roller bearing of CA design but with enhanced roller guidance and correspondingly reduced friction |
| CB | Single row angular contact ball bearing for universal pairing in back-to-back, face-to-face or tandem arrangement. When arranged back-to-back or face-toface there will be an axial clearance greater than CA |
| CC | 1. Spherical roller bearing of C design but with enhanced roller guidance and correspondingly reduced friction 2. Single row angular contact ball bearing for universal pairing in back-toback, face-to-face or tandem arrangement. When arranged back-to-back or face-to-face there will be an axial clearance greater than CB |
| CLN | Taper roller bearing with reduced total (abutment) and ring width tolerances corresponding to ISO tolerance class 6X |
| CL0 | Inch-size taper roller bearing with increased accuracy to ISO tolerance class 0 specifications (ISO standard now withdrawn) = ANSI-ABMA Standard 19 tolerance class 0 |
| CL00 | Inch-size taper roller bearing with increased accuracy to ISO tolerance class 00 specifications (ISO Standard now withdrawn) = ANSI-ABMA Standard 19 tolerance class 00 |
| CL3 | Inch-size taper roller bearing with increased accuracy to ISO tolerance class 3 specifications (ISO Standard now withdrawn) = ANSI-ABMA Standard 19 tolerance class 3 |
| CL7A | Previous standard taper roller bearing quality for pinion bearing arrangements |
| CN |
Normal internal clearance, normally only used together with a second letter which identifies a reduced or displaced clearance range
|
| C1 | Bearing internal clearance smaller than C2 |
| C2 | Bearing internal clearance smaller than Normal |
| C3 | Bearing internal clearance greater than Normal |
| C4 | Bearing internal clearance greater than C3 |
| C5 | Bearing internal clearance greater than C4 A letter (H, M, L or P) following the clearance class is used to indicate that the clearance range is reduced or displaced, see under CN. |
| C01 | Reduced running accuracy tolerance range for inner ring |
| C02 | Reduced running accuracy tolerance range for inner ring, smaller than C01 |
| C03 | Reduced running accuracy tolerance range for outer ring |
| DB |
Two single row deep groove ball bearings, single row angular contact ball bearings or single row taper roller bearings matched for mounting in a backto- back arrangement; the letter(s) following the DB indicate the magnitude of the axial internal clearance or preload in the bearing before mounting; for paired taper roller bearings the design and arrangement of the intermediate rings between the inner and/or outer rings are identified by a two-figure number which follows immediately after DB
|
| DF | Two single row deep groove ball bearings, single row angular contact ball bearings or single row taper roller bearings matched for mounting in a faceto- face arrangement; the letter(s) following the DF are explained under DB |
| DG | Two single row angular contact ball bearings for universal pairing, i.e. paired for mounting in a back-to-back, face-to-face or tandem arrangement; supplementary designations for axial internal clearance and preload are explained under DB |
| DH | Single direction thrust bearing with two housing washers |
| DR | Two single row deep groove ball bearings or cylindrical roller bearings paired to achieve even radial load distribution |
| DS | 1. Single direction thrust bearing with two shaft washers 2. Split radial needle roller and cage assembly |
| DT | Two single row deep groove ball bearings, single row angular contact ball bearings or single row taper roller bearings matched for mounting in a tandem arrangement; for paired taper roller bearings the design and arrangement of the intermediate rings between the inner and/or outer rings are identified by a two-figure number which follows immediately after DT |
| D8 | Deep groove ball bearing of open design, also available as standard with shields or seals, but without seal recesses in the outer ring |
| E |
Deviating or modified internal design with same boundary dimensions; as a rule the significance of the letter is bound to the particular bearing or bearing series; usually indicates reinforced rolling element complement |
| EC | Single row cylindrical roller bearing with optimised internal design |
| FA | Machined steel or special cast iron cage; outer ring centred |
| FB | Machined steel or special cast iron cage; inner ring centred |
| 2F | Y-bearing with plain flinger at both sides |
| G | Single row angular contact ball bearing for universal pairing in a back-toback, face-to-face or tandem arrangement; when mounted back-to-back or face-to-face, the bearing pair will have a small axial clearance |
| GA | Single row angular contact ball bearing for universal pairing in a back-toback or face-to- face arrangement; when mounted the bearing pair will have a slight preload |
| GB | Single row angular contact ball bearing for universal pairing in a back-toback or face-to- face arrangement; when mounted the bearing pair will have a preload greater than GA |
| GC | Single row angular contact ball bearing for universal pairing in a back-toback or face-to- face arrangement; when mounted the bearing pair will have a preload greater than GB |
| H | 1. Pressed steel cage (snap-type), hardened 2. Needle roller bearing without inner ring with reduced inside diameter (under rollers) tolerance; followed by tolerance limits in μm, e.g. /H+20+27 |
| HA |
Case hardened bearing or bearing component; for closer identification HA is followed by one of the following figures
|
| HB | Bainite hardened bearing or bearing component; for closer identification HB is followed by one of the figures explained under HA |
| HE | Bearing or bearing component of vacuum remelted steel; for closer identification HE is followed by one of the figures explained under HA |
| HM | Martensite hardened bearing or bearing component; for closer identification HM is followed by one of the figures explained under HA |
| HT |
Grease for high temperatures (–20 to +130 °C), followed by a two-figure number which identifies the actual grease; grease quantities which differ from the standard fill are identified by a letter following HTxx:
More recently A, B and C have been replaced by F followed by one figure;
F1 = A, F7 = B and F9 = C; the figures have the same significance as those
used with the new grease codes Gxx
|
| HV | Bearing or bearing component of hardenable stainless steel; for closer identification HV is followed by one of the figures explained under HA |
| IS | Needle roller bearing with lubricating hole(s) in inner ring; a figure following IS identifies the number of holes |
| J | Pressed steel cage, unhardened; different designs or materials are identified by a figure, e.g. J1 |
| JR | Pressed steel cage consisting of two flat unhardened washers riveted together (for large thrust bearings) |
| JW | Pressed steel cage, unhardened, welded |
| K | Tapered bore; taper 1:12 on diameter |
| K30 | Tapered bore; taper 1:30 on diameter |
| L | Machined light alloy cage; different designs or materials are identified by a figure, e.g. L1 |
| LA | Machined light alloy cage, outer ring centred |
| LB | Machined light alloy cage, inner ring centred |
| LHT | Grease for low and high temperatures (–40 to +140 °C), followed by a twofigure number which identifies the actual grease; grease quantities which differ from the standard fill are identified by a letter following LHTxx, or by Fx as explained under HT |
| LO | Bearing without preservative, but coated with low viscosity oil; the actual oil is identified by figures following the LO, e.g. LO10 |
| LP | Light alloy window-type cage, with punched or reamed pockets, inner or outer ring centred |
| LPS | As LP but with lubrication grooves in the guiding surfaces |
| LS | Land riding seal at one side of bearing; rubbing seal, usually of sheet steel reinforced synthetic rubber, seals against inner ring shoulder |
| M | Machined brass cage; different designs or materials are identified by a figure, e.g. M2 |
| MA | Machined brass cage, outer ring centred |
| MAS | As MA but with lubrication grooves in the guiding surfaces |
| MB | Machined brass cage, inner ring centred |
| MBS | As MB but with lubrication grooves in the guiding surfaces |
| MO | Bearing without preservative, but coated with medium viscosity oil; the actual oil is identified by figures following the MO, e.g. MO10 |
| MP | Machined brass window-type cage, with punched or reamed pockets, inner or outer ring centred |
| MPS | As MP but with lubrication grooves in the guiding surfaces |
| MT | Grease for medium temperatures (–30 to +110 °C), followed by a two-figure number which identifies the actual grease; grease quantities which differ from the standard fill are identified by a letter following MTxx, or by Fx as explained under HT |
| N | Snap ring groove in outer ring |
| NR | As N but with snap ring |
| N1 | One locating slot in outer ring |
| N2 | Two locating slots in outer ring at 180° to each other |
| P | Moulded glass fibre reinforced polyamide 6,6 cage |
| P4 | Dimensional and running accuracy to ISO tolerance class 4 (better than P5) |
| P4A | Dimensional accuracy to ISO tolerance class 4 and running accuracy to ABMA tolerance class ABEC 9 |
| P5 | Dimensional and running accuracy to ISO tolerance class 5 (better than P6) |
| P6 | Dimensional and running accuracy to ISO tolerance class 6 (better than Normal) |
| PA9 | Dimensional and running accuracy to ABMA tolerance class ABEC 9 (better than P4) |
| PA9B | As PA9 but running accuracy better than ABMA tolerance class ABEC 9 |
| QBC | Set of four matched deep groove or angular contact ball bearings; two bearings arranged back-to-back with the other two arranged outside the backto- back pair in tandem with them, i.e. two tandem pairs arranged back-toback |
| QBT | Set of four matched deep groove or angular contact ball bearings; two bearings arranged back-to-back and the other two in tandem at one side of the back-to-back pair, i.e. three bearings in tandem and back-to-back with fourth bearing |
| QFC | Set of four matched deep groove or angular contact ball bearings; as /QBC but with central pair arranged face-to-face, i.e. two tandem pairs arranged face-to-face |
| QFT | Set of four matched deep groove or angular contact ball bearings; as /QBT but with face-to-face pair at one side, i.e. three bearings in tandem and faceto- face with fourth bearing |
| QR | Set of four single row deep groove ball or cylindrical roller bearing matched for equal distribution of radial load |
| QT | Set of four matched deep groove or angular contact ball bearings arranged in tandem |
| R | 1. External flange on outer ring 2. Crowned runner surface of support rollers |
| RS | Rubbing seal of nitrile rubber at one side of bearing (needle roller bearings) |
| RS1 | Rubbing seal of nitrile rubber with sheet steel reinforcement at one side of bearing |
| RS2 | Rubbing seal of fluoro rubber with sheet steel reinforcement at one side of bearing |
| 2RS | RS seal at both sides of bearing (needle roller bearing) |
| 2RS1 | RS1 seal at both sides of bearing |
| 2RS2 | RS2 seal at both sides of bearing |
| RZ | Low- friction rubbing seal of nitrile rubber with sheet steel reinforcement at one side of bearing |
| 2RZ | RZ seal at both sides of bearing |
| SM | Needle roller bearing with grease. The two- figure number following identifies the actual grease |
| SORT | Tolerance grade of needle rollers of a needle roller and cage assembly; the figures following give the actual limits in μm, e.g. /SORT-2-4 |
| SP | Special tolerance class for machine tool spindle bearings; dimensional accuracy approximately to ISO tolerance class 5 and running accuracy approximately to ISO tolerance class 4 |
| S0 | Bearing rings (or washers) dimensionally stabilised for use at operating temperatures up to +150 °C |
| S1 | Bearing rings (or washers) dimensionally stabilised for use at operating temperatures up to +200 °C |
| S2 | Bearing rings (or washers) dimensionally stabilised for use at operating temperatures up to +250 °C |
| S3 | Bearing rings (or washers) dimensionally stabilised for use at operating temperatures up to +300 °C |
| S4 | Bearing rings (or washers) dimensionally stabilised for use at operating temperatures up to +350 °C |
| T | Machined fabric reinforced phenolic resin cage |
| TA | Machined fabric reinforced phenolic resin cage, outer ring centred |
| TB | Machined fabric reinforced phenolic resin cage, inner ring centred |
| TBT | Set of three matched single row deep groove or angular contact ball bearings; two bearings arranged back-to-back and the third in tandem |
| TFT | Set of three matched single row deep groove or angular contact ball bearings; two bearings arranged face-to-face and the third in tandem |
| TH | Machined cage of fabric reinforced phenolic resin |
| TN | Moulded cage of plastic; different designs or materials are identified by a figure following the TN
|
| TR | Three single row deep groove ball or cylindrical roller bearings, matched to give equal distribution of radial load |
| TT | Set of three matched single row deep groove or angular contact ball bearings arranged in tandem |
| U | 1. Y-bearing without locking collar 2. Y-bearing locking collar without grub screw |
| UP | Special tolerance class for machine tool spindle bearings; dimensional accuracy approximately to ISO tolerance class 4 and running accuracy better than ISO class 4 |
| V | Full complement bearing (without cage) |
| W | Bearing without relubrication facility |
| W20 | Three lubrication holes in outer ring |
| W26 | Six lubrication holes in inner ring |
| W33 | Annular groove and three lubrication holes in outer ring |
| W33X | Annular groove and six lubrication ho les in outer ring |
| X | 1. Boundary dimensions altered to conform to ISO standards 2. Cylindrical runner surface (support rollers, cam followers) |
| Y | Pressed brass cage; different designs or materials are identified by a figure following the Y, e.g. Y1 |
| Z | 1. Combined needle roller bearings with cover 2. Shield (non-rubbing seal) at one side of bearing |
| 2Z | Z shield at both sides of bearing |
| ZW | Double row needle roller and cage assembly |
