29252-NTN bearing: complete specifications & equivalents
The 29252-NTN is a ISO 104 radial bearing sized 260 x 360 x 60 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 260 mm |
| Outer diameter D | 360 mm |
| Width B | 60 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 960 kN |
| Basic static load rating C0 | 3950 kN |
| Fatigue load limit Pu | 296 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 18600 g |
| Manufacturer designation | NTN 29252 |
| 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 | 10.236 in |
|---|---|
| Outer diameter D | 14.173 in |
| Width B | 2.362 in |
| ISO bore code | 52 |
| Radial section height (D−d)/2 | 50 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) | 9 of 26 |
| Bore above smallest 29200-series size | 110 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29252 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 260×360×60 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 29252-NTN model number is decoded
NTN 29252 belongs to the light-section 29200 spherical-thrust family of spherical roller thrust bearings: 260 / 360 / 60 mm (bore / OD / height). Reading the code: 292 is the dimension series (light-section 29200 spherical-thrust family), and 52 encodes the 260 mm bore (bore code x 5). With Ca 960 kN and C0a 3950 kN, each mm of bore carries about 3.69 kN of dynamic axial rating. Choose the light-section 29200 spherical-thrust family when heavy thrust meets misalignment: vertical turbines, mills and slew pivots are the classic homes. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 960 kN class thrust.
Typical equipment & failure modes
Common applications
- large vertical mill and crusher main shafts
- heavy stacker/reclaimer and shiploading pivots
- vertical hydro and pump-turbine main thrust blocks
- heavy rolling-mill and forging-press thrust seats
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
- fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact
- fretting on the shaft seat after the washer crept under reversing axial shock
Selection pitfalls — read before you substitute
- At 260 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 260 mm bore it trades capacity for a smaller 360 mm OD and lower height.
- The 60 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.
- Below the minimum axial load the rollers skid; at 1,100 r/min the Ca of 960 kN never comes into play before the raceway is smeared.
- The C0a of 3950 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.
- The Ca 960/C0a 3950 kN ratings and 296 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29252; 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 29252?
29252 is a spherical roller thrust bearing to ISO 104: 260 mm shaft-washer bore, 360 mm outside diameter, 60 mm stack height (10.236 x 14.173 x 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 960 kN, C0a 3950 kN and a 296 kN fatigue load limit Pu; limiting speed 1,100 r/min with oil lubrication; mass about 18600 g.
How is the 29252 designation structured?
292 is the dimension series (light-section 29200 spherical-thrust family); 52 encodes the 260 mm bore (bore code x 5). The 360 mm OD and 60 mm height follow the ISO 104 boundary plan for that series.
Can 29252 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, 1,100 r/min, for 29252?
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 29252?
The 260/360/60 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 960 kN / C0a 3950 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.