29452 bearing: complete specifications & equivalents
The 29452 is a ISO 104 radial bearing sized 260 x 480 x 132 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 | 480 mm |
| Width B | 132 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 3050 kN |
| Basic static load rating C0 | 10000 kN |
| Fatigue load limit Pu | 610 kN |
| Limiting speed (mechanical) | 670 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 108000 g |
| Manufacturer designation | NTN 29452 |
| 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 | 10.236 in |
|---|---|
| Outer diameter D | 18.898 in |
| Width B | 5.197 in |
| ISO bore code | 52 |
| Radial section height (D−d)/2 | 110 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) | 21 of 46 |
| Bore above smallest 29400-series size | 200 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29452-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 260×480×132 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 29452 model number is decoded
NTN 29452 belongs to the heavy-section 29400 spherical-thrust family of spherical roller thrust bearings: 260 / 480 / 132 mm (bore / OD / height). The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 52 encodes the 260 mm bore (bore code x 5). At 132 mm of height the bearing packs the heavy-section capacity into a stack far shorter than a comparable multi-row ball arrangement. Selection starts from the load case: axial must dominate, and any radial share must stay within the catalogue combined-load rule while the bearing self-aligns. 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
- 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
- oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage
- flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates
- fretting on the shaft seat after the washer crept under reversing axial shock
- 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 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 294 heavy section tops the plan at this bore with the largest 480 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.
- Below the minimum axial load the rollers skid; at 670 r/min the Ca of 3050 kN never comes into play before the raceway is smeared.
- Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.
- 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 3050/C0a 10000 kN ratings and 610 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29452; 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 29452?
29452 is a spherical roller thrust bearing to ISO 104: 260 mm shaft-washer bore, 480 mm outside diameter, 132 mm stack height (10.236 x 18.898 x 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 3050 kN, C0a 10000 kN and a 610 kN fatigue load limit Pu; limiting speed 670 r/min with oil lubrication; mass about 108000 g.
How is the 29452 designation structured?
294 is the dimension series (heavy-section 29400 spherical-thrust family); 52 encodes the 260 mm bore (bore code x 5). The 480 mm OD and 132 mm height follow the ISO 104 boundary plan for that series.
Can 29452 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, 670 r/min, for 29452?
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 29452?
The 260/480/132 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 3050 kN / C0a 10000 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.