29234 bearing: complete specifications & equivalents
The 29234 is a ISO 104 radial bearing sized 170 x 240 x 42 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 170 mm |
| Outer diameter D | 240 mm |
| Width B | 42 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 475 kN |
| Basic static load rating C0 | 1770 kN |
| Fatigue load limit Pu | 146 kN |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 6020 g |
| Manufacturer designation | NTN 29234 |
| 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 | 6.693 in |
|---|---|
| Outer diameter D | 9.449 in |
| Width B | 1.654 in |
| ISO bore code | 34 |
| Radial section height (D−d)/2 | 35 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) | 3 of 26 |
| Bore above smallest 29200-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29234 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 29234 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 29234 appears as a light-section 29200 spherical-thrust family bearing with a 170 mm shaft washer, 240 mm across the housing washer and 42 mm of height. The designation is 292 is the dimension series (light-section 29200 spherical-thrust family) plus 34 encodes the 170 mm bore (bore code x 5). NTN prints 475 kN axial dynamic and 1770 kN axial static for this size and a 146 kN fatigue load limit Pu. 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. 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
- heavy rolling-mill and forging-press thrust seats
- large marine propulsion thrust supports
- crane and excavator main slew bearings duty
- rotary kiln and furnace thrust positions
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
- 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 170 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 170 mm bore it trades capacity for a smaller 240 mm OD and lower height.
- The C0a of 1770 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.
- Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29234 stack as a set.
- Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29234 stack as a set.
- The Ca 475/C0a 1770 kN ratings and 146 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29234; 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 29234?
29234 is a spherical roller thrust bearing to ISO 104: 170 mm shaft-washer bore, 240 mm outside diameter, 42 mm stack height (6.693 x 9.449 x 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 475 kN, C0a 1770 kN and a 146 kN fatigue load limit Pu; limiting speed 1,600 r/min with oil lubrication; mass about 6020 g.
How is the 29234 designation structured?
292 is the dimension series (light-section 29200 spherical-thrust family); 34 encodes the 170 mm bore (bore code x 5). The 240 mm OD and 42 mm height follow the ISO 104 boundary plan for that series.
Can 29234 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, 1,600 r/min, for 29234?
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 29234?
The 170/240/42 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 475 kN / C0a 1770 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.