29230 bearing: complete specifications & equivalents
The 29230 is a ISO 104 radial bearing sized 150 x 215 x 39 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 150 mm |
| Outer diameter D | 215 mm |
| Width B | 39 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 380 kN |
| Basic static load rating C0 | 1340 kN |
| Fatigue load limit Pu | 122 kN |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4560 g |
| Manufacturer designation | NTN 29230 |
| 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 | 5.906 in |
|---|---|
| Outer diameter D | 8.465 in |
| Width B | 1.535 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 32.5 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) | 1 of 26 |
| Bore above smallest 29200-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29230-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×215×39 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 29230 model number is decoded
At 150 x 215 x 39 mm, NTN 29230 sits in the light-section 29200 spherical-thrust family of the spherical-thrust programme. Reading the code: 292 is the dimension series (light-section 29200 spherical-thrust family), and 30 encodes the 150 mm bore (bore code x 5). Shaft and housing washers separate, so the 150 mm shaft washer can be mounted on the shaft before the roller set and housing washer follow. If speed climbs toward the 1,800 r/min oil rating, the lubrication design — bath, circulation, cooling — becomes the real selection criterion. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 380 kN class thrust.
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
- 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
- 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 150 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 150 mm bore it trades capacity for a smaller 215 mm OD and lower height.
- Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 1,800 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.
- Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29230 was chosen for.
- The Ca 380/C0a 1340 kN ratings and 122 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29230; 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 29230?
29230 is a spherical roller thrust bearing to ISO 104: 150 mm shaft-washer bore, 215 mm outside diameter, 39 mm stack height (5.906 x 8.465 x 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 380 kN, C0a 1340 kN and a 122 kN fatigue load limit Pu; limiting speed 1,800 r/min with oil lubrication; mass about 4560 g.
How is the 29230 designation structured?
292 is the dimension series (light-section 29200 spherical-thrust family); 30 encodes the 150 mm bore (bore code x 5). The 215 mm OD and 39 mm height follow the ISO 104 boundary plan for that series.
Can 29230 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, 1,800 r/min, for 29230?
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 29230?
The 150/215/39 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 380 kN / C0a 1340 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.