29415 bearing: complete specifications & equivalents
The 29415 is a ISO 104 radial bearing sized 75 x 160 x 51 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 75 mm |
| Outer diameter D | 160 mm |
| Width B | 51 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 465 kN |
| Basic static load rating C0 | 1190 kN |
| Fatigue load limit Pu | 102 kN |
| Limiting speed (mechanical) | 2100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5070 g |
| Manufacturer designation | NTN 29415 |
| Standard | ISO 104 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & 29400-series range
| Bore d | 2.953 in |
|---|---|
| Outer diameter D | 6.299 in |
| Width B | 2.008 in |
| ISO bore code | 15 |
| Radial section height (D−d)/2 | 42.5 mm |
| Smallest bore in 29400-series | 60 mm |
| Largest outer diameter in 29400-series | 1770 mm |
| Width range across 29400-series | 42–426 mm |
| Bore position in 29400-series (smallest first) | 4 of 46 |
| Bore above smallest 29400-series size | 15 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29415-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 75×160×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 29415 model number is decoded
29415 is an NTN spherical roller thrust bearing of the heavy-section 29400 spherical-thrust family: 75 mm bore, 160 mm outside diameter, 51 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 15 encodes the 75 mm bore (bore code x 5). Shaft and housing washers separate, so the 75 mm shaft washer can be mounted on the shaft before the roller set and housing washer follow. Against a thrust ball bearing of the same 75 mm bore, this bearing carries many times the load at lower speed — the trade is oil lubrication and price. On vertical shafts, confirm the minimum axial load from the rotor weight plus any spring preload before the first run at speed.
Typical equipment & failure modes
Common applications
- large mixer, reactor and agitator vertical shafts
- bulk-handler stacker/reclaimer slew pivots
- vertical hydro-turbine and large pump thrust supports
- rolling-mill screwdown and backup-roll thrust positions
Known failure patterns
- cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue
- roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing
- roller skid smearing when axial load fell below the minimum while the shaft was still turning fast
- thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation
- contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue
Selection pitfalls — read before you substitute
- Bearings of 75 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.
- The 294 heavy section tops the plan at this bore with the largest 160 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.
- A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.
- Oil is not optional at this rating: the 2,100 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.
- Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29415 was chosen for.
- The Ca 465/C0a 1190 kN ratings and 102 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29415; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 29415?
29415 is a spherical roller thrust bearing to ISO 104: 75 mm shaft-washer bore, 160 mm outside diameter, 51 mm stack height (2.953 x 6.299 x 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 465 kN, C0a 1190 kN and a 102 kN fatigue load limit Pu; limiting speed 2,100 r/min with oil lubrication; mass about 5070 g.
How is the 29415 designation structured?
294 is the dimension series (heavy-section 29400 spherical-thrust family); 15 encodes the 75 mm bore (bore code x 5). The 160 mm OD and 51 mm height follow the ISO 104 boundary plan for that series.
Can 29415 handle misalignment and radial load?
Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing.
Why does NTN print only an oil speed, 2,100 r/min, for 29415?
Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run.
What should be checked before substituting another make for 29415?
The 75/160/51 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 465 kN / C0a 1190 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.