29460 bearing: complete specifications & equivalents
The 29460 is a ISO 104 radial bearing sized 300 x 540 x 145 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 300 mm |
| Outer diameter D | 540 mm |
| Width B | 145 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 3850 kN |
| Basic static load rating C0 | 13200 kN |
| Fatigue load limit Pu | 735 kN |
| Limiting speed (mechanical) | 590 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 147000 g |
| Manufacturer designation | NTN 29460 |
| 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 | 11.811 in |
|---|---|
| Outer diameter D | 21.26 in |
| Width B | 5.709 in |
| ISO bore code | 60 |
| Radial section height (D−d)/2 | 120 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) | 23 of 46 |
| Bore above smallest 29400-series size | 240 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29460-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 300×540×145 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 29460 model number is decoded
The heavy-section 29400 spherical-thrust family entry 29460 combines a spherical housing-washer raceway with asymmetric barrel rollers in 145 mm of stack height. The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 60 encodes the 300 mm bore (bore code x 5). At 145 mm of height the bearing packs the heavy-section capacity into a stack far shorter than a comparable multi-row ball arrangement. Minimum axial load matters here too: at speed the rollers skid on a lightly loaded bearing, so check the catalogue minimum-load formula before downsizing the thrust spring. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat.
Typical equipment & failure modes
Common applications
- vertical hydro and pump-turbine main thrust blocks
- heavy rolling-mill and forging-press thrust seats
- large marine propulsion thrust supports
- crane and excavator main slew bearings duty
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
- At 300 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.
- The 294 heavy section tops the plan at this bore with the largest 540 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.
- Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 590 r/min end of the range.
- Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.
- Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.
- The Ca 3850/C0a 13200 kN ratings and 735 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29460; 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 29460?
29460 is a spherical roller thrust bearing to ISO 104: 300 mm shaft-washer bore, 540 mm outside diameter, 145 mm stack height (11.811 x 21.26 x 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 3850 kN, C0a 13200 kN and a 735 kN fatigue load limit Pu; limiting speed 590 r/min with oil lubrication; mass about 147000 g.
How is the 29460 designation structured?
294 is the dimension series (heavy-section 29400 spherical-thrust family); 60 encodes the 300 mm bore (bore code x 5). The 540 mm OD and 145 mm height follow the ISO 104 boundary plan for that series.
Can 29460 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, 590 r/min, for 29460?
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 29460?
The 300/540/145 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 3850 kN / C0a 13200 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.