29260-NTN bearing: complete specifications & equivalents
The 29260-NTN is a ISO 104 radial bearing sized 300 x 420 x 73 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 | 420 mm |
| Width B | 73 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 1330 kN |
| Basic static load rating C0 | 5350 kN |
| Fatigue load limit Pu | 385 kN |
| Limiting speed (mechanical) | 870 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 30900 g |
| Manufacturer designation | NTN 29260 |
| 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 & 29200-series range
| Bore d | 11.811 in |
|---|---|
| Outer diameter D | 16.535 in |
| Width B | 2.874 in |
| ISO bore code | 60 |
| Radial section height (D−d)/2 | 60 mm |
| Smallest bore in 29200-series | 150 mm |
| Largest outer diameter in 29200-series | 1060 mm |
| Width range across 29200-series | 39–155 mm |
| Bore position in 29200-series (smallest first) | 11 of 26 |
| Bore above smallest 29200-series size | 150 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29260 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 300×420×73 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 29260-NTN model number is decoded
29260 is an NTN spherical roller thrust bearing of the light-section 29200 spherical-thrust family: 300 mm bore, 420 mm outside diameter, 73 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Reading the code: 292 is the dimension series (light-section 29200 spherical-thrust family), and 60 encodes the 300 mm bore (bore code x 5). The static/dynamic ratio of 4.02 tells the story of a roller raceway: enormous reserve for slow, shocked or oscillating thrust. Choose the light-section 29200 spherical-thrust family when heavy thrust meets misalignment: vertical turbines, mills and slew pivots are the classic homes. Fill the housing with the specified oil to the level that reaches the cage — these bearings are oil-bath or circulation machines, not grease machines.
Typical equipment & failure modes
Common applications
- crane and excavator main slew bearings duty
- rotary kiln and furnace thrust positions
- large vertical mill and crusher main shafts
- heavy stacker/reclaimer and shiploading pivots
Known failure patterns
- edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite
- 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
- fretting on the shaft seat after the washer crept under reversing axial shock
- fretting on the shaft seat after the washer crept under reversing axial shock
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 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 300 mm bore it trades capacity for a smaller 420 mm OD and lower height.
- A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.
- Below the minimum axial load the rollers skid; at 870 r/min the Ca of 1330 kN never comes into play before the raceway is smeared.
- A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.
- The Ca 1330/C0a 5350 kN ratings and 385 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29260; 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 29260?
29260 is a spherical roller thrust bearing to ISO 104: 300 mm shaft-washer bore, 420 mm outside diameter, 73 mm stack height (11.811 x 16.535 x 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1330 kN, C0a 5350 kN and a 385 kN fatigue load limit Pu; limiting speed 870 r/min with oil lubrication; mass about 30900 g.
How is the 29260 designation structured?
292 is the dimension series (light-section 29200 spherical-thrust family); 60 encodes the 300 mm bore (bore code x 5). The 420 mm OD and 73 mm height follow the ISO 104 boundary plan for that series.
Can 29260 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, 870 r/min, for 29260?
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 29260?
The 300/420/73 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1330 kN / C0a 5350 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.