NTN rolling bearing part numbers indicate bearing type, dimensions, tolerances, internal construction, and other related specifications. Please refer to bearing nomenclature.
NTN bearing numbers are comprised of a “basic number” followed by “supplementary codes.”
The NTN basic number of rolling bearing indicates general information about a NTN bearing, such as its fundamental type, boundary dimensions, series number, bore diameter code and contact angle.
The supplementary codes derive from prefixes and suffixes which indicate a bearing's tolerances, internal clearances, and related specifications.
“ULTAGE” (a name created from the combination of “ultimate,” signifying refinement, and “stage,” signifying NTN's intention that this series of products be employed in diverse applications) is the general name for NTN's new generation of bearings that are noted for their industry leading performance.
The makeup and order of NTN bearing numbers is shown below:
NTN supplementary prefix code nomenclature
- 4T-: 4T tapered roller bearings
- E-: Bearings using carburizing (case hardened) steel
- F-: Stainless steel bearings
- TS2-: Dimension stabilized bearing for high temperature use (to 160 °C)
- TS3-: Dimension stabilized bearing for high temperature use (to 200 °C)
- TS4-: Dimension stabilized bearing for high temperature use (to 250 °C)
NTN basic number nomenclature
| Bearing series | Bore diameter code | Contact angle code | ||||
|---|---|---|---|---|---|---|
| NTN bearing series code | Dimension series code | |||||
| Width/height series | Diameter series | Code | Bore diameter mm | Code | Contact angle | |
| Deep groove ball bearings (type code 6) | /0.6 | 0.6 | ||||
| 67 | (1) | 7 | /1.5 | 1.5 | ||
| 68 | (1) | 8 | /2.5 | 2.5 | ||
| 69 | (1) | 9 | ||||
| 160 | (0) | 0 | 1 | 1 | ||
| 60 | (1) | 0 | ... | ... | ||
| 62 | (0) | 2 | 9 | 9 | ||
| 63 | (0) | 3 | ||||
| Angular contact ball bearings (type code 7) | 00 | 10 | Angular contact ball bearing | |||
| 78 | (1) | 8 | 01 | 12 | (A) | contact angle 30° |
| 79 | (1) | 9 | 02 | 15 | B | contact angle 40° |
| 70 | (1) | 0 | 03 | 17 | C | contact angle 15° |
| 72 | (0) | 2 | ||||
| 73 | (0) | 3 | /22 | 22 | ||
| Self aligning ball bearings (type code 1, 2) | /28 | 28 | ||||
| 12 | (0) | 2 | /32 | 32 | ||
| 13 | (0) | 3 | ||||
| 22 | (2) | 2 | 04 | 20 | ||
| 23 | (2) | 3 | 05 | 25 | ||
| Cylindrical roller bearings (type code NU, N, NF, NNU, NN, etc.) | 06 | 30 | ||||
| NU10 | 1 | 0 | ... | ... | ||
| NU2 | (0) | 2 | 88 | 440 | ||
| NU22 | 2 | 2 | 92 | 460 | ||
| NU3 | (0) | 3 | 96 | 480 | ||
| NU23 | 2 | 3 | ||||
| NU4 | (0) | 4 | /500 | 500 | ||
| NNU49 | 4 | 9 | /530 | 530 | ||
| NN30 | 3 | 0 | /560 | 560 | ||
| Tapered roller bearings (type code 3) | ... | ... | Tapered roller bearing | |||
| 329X | 2 | 9 | /2360 | 2360 | (B) | Contact angle over 10° to/including 17° |
| 320X | 2 | 0 | /2500 | 2500 | C | Contact angle over 17° to/including 24° |
| 302 | 0 | 2 | D | Contact angle over 24° to/including 32° | ||
| 322 | 2 | 2 | ||||
| 303 | 0 | 3 | ||||
| 303D | 0 | 3 | ||||
| 313X | 1 | 3 | ||||
| 323 | 2 | 3 | ||||
| Spherical roller bearings (type code 2) | ||||||
| 239 | 3 | 9 | ||||
| 230 | 3 | 0 | ||||
| 240 | 4 | 0 | ||||
| 231 | 3 | 1 | ||||
| 241 | 4 | 1 | ||||
| 222 | 2 | 2 | ||||
| 232 | 3 | 2 | ||||
| 213 | 1 | 3 | ||||
| 223 | 2 | 3 | ||||
| Single direction thrust ball bearings (type code 5) | ||||||
| 511 | 1 | 1 | ||||
| 512 | 1 | 2 | ||||
| 513 | 1 | 3 | ||||
| 514 | 1 | 4 | ||||
| Thrust cylindrical roller bearings (type code 8) | ||||||
| 811 | 1 | 1 | ||||
| 812 | 1 | 2 | ||||
| 893 | 9 | 3 | ||||
| Thrust spherical roller bearings (type code 2) | ||||||
| 292 | 9 | 2 | ||||
| 293 | 9 | 3 | ||||
| 294 | 9 | 4 | ||||
Note: Codes in ( ) are not shown in nominal numbers.
NTN bearing supplementary suffix codes
1, Internal modifications code
- U: Internationally interchangeable tapered roller bearings
- R: Noninternationally interchangeable tapered roller bearings
- ST: Low torque tapered roller bearings
- HT: Angular contact ball bearings and cylindrical roller bearings for high axial loads
- E: High load capacity cylindrical roller bearing
- EA: ULTAGE series cylindrical roller bearings
- E: ULTAGE series spherical roller bearings
- UTG: ULTAGE series Large size tapered roller bearing
2, Cage code
- L1: High strength, machined brass cage
- F1: Machined carbon steel cage
- G1: High strength machined brass rivetless cage with square holes
- G2: Pin type cage
- J: Pressed steel cage
- T2: Resin cage
- A: Pressed steel cage (ULTAGE series spherical roller bearings)
- M: High strength, machined brass cage (ULTAGE series spherical roller bearings)
3, Seal / Shield code
- LB: One-side synthetic rubber seal (non-contact type)
- LLB: Double-side synthetic rubber seal (non-contact type)
- LU: One-side synthetic rubber seal (contact type)
- LLU: Double-side synthetic rubber seal (contact type)
- LH: One-side synthetic rubber seal (low-torque type)
- LLH: Double-side synthetic rubber seal (low-torque type)
- Z: One-side steel Shield
- ZZ: Double-side steel Shield
4, Raceway external configuration code
- K: Tapered inner ring bore, standard taper ratio 1:12
- K30: Tapered inner ring bore, standard taper ratio 1:30
- N: With snap ring groove
- NR: Snap ring
- D: With oil inlet
- D1: With oil inlet and oil groove
5, Duplex arrangement code
- DB: Back-to-back arrangement
- DF: Face-to-face arrangement
- DT: Tandem arrangement
- D2: Two matched, paired bearings
- +&alpha Spacer (&alpha = spacer's standard width dimensions)
6, Internal clearance Preload code
- C2: Internal clearance less than normal
- (CN): Normal clearance
- C3: Internal clearance greater than normal
- C4: Internal clearance greater than C3
- C5: Internal clearance greater than C4
- CM: Radial internal clearance for electric motor use
- /GL: Light preload
- /GN: Normal preload
- /GM: Medium preload
- /GH: Heavy preload
7, Tolerance code
- (P0): JIS Class 0
- P6: JIS Class 6
- P5: JIS Class 5
- P4: JIS Class 4
- P2: JIS Class 2
- -4: ABMA Class 4
- -2: ABMA Class 2
- -3: ABMA Class 3
- -0: ABMA Class 0
- -00: ABMA Class 00
8, Lubrication
- /2AS: Alvania Grease S2
- /3AS: Alvania Grease S3
- /8A: Alvania EP Grease 2
- /5K: Multemp SRL
- /LX11: Barrierta JFE552
- /LP03: Solid grease