29238 bearing: complete specifications & equivalents
The 29238 is a ISO 104 radial bearing sized 190 x 270 x 48 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 190 mm |
| Outer diameter D | 270 mm |
| Width B | 48 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 585 kN |
| Basic static load rating C0 | 2230 kN |
| Fatigue load limit Pu | 184 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 8800 g |
| Manufacturer designation | NTN 29238 |
| 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 | 7.48 in |
|---|---|
| Outer diameter D | 10.63 in |
| Width B | 1.89 in |
| ISO bore code | 38 |
| Radial section height (D−d)/2 | 40 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) | 5 of 26 |
| Bore above smallest 29200-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29238 | 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 29238 model number is decoded
29238 is the 190 mm member of NTN's light-section 29200 spherical-thrust family: 270 mm over the housing washer, 48 mm tall. NTN builds the number from 292 is the dimension series (light-section 29200 spherical-thrust family); 38 encodes the 190 mm bore (bore code x 5). A machined cage guided on the shaft-washer sleeve keeps the roller set spaced at the 1,400 r/min oil rating. For oscillating or slow heavy duty, size from C0a 2230 kN with the static safety factor rather than from the life equation. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat.
Typical equipment & failure modes
Common applications
- large marine propulsion thrust supports
- crane and excavator main slew bearings duty
- rotary kiln and furnace thrust positions
- large vertical mill and crusher main shafts
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
- cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces
- fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact
Selection pitfalls — read before you substitute
- At 190 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 190 mm bore it trades capacity for a smaller 270 mm OD and lower height.
- Oil is not optional at this rating: the 1,400 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.
- A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.
- Oil is not optional at this rating: the 1,400 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.
- The Ca 585/C0a 2230 kN ratings and 184 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29238; 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 29238?
29238 is a spherical roller thrust bearing to ISO 104: 190 mm shaft-washer bore, 270 mm outside diameter, 48 mm stack height (7.48 x 10.63 x 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 585 kN, C0a 2230 kN and a 184 kN fatigue load limit Pu; limiting speed 1,400 r/min with oil lubrication; mass about 8800 g.
How is the 29238 designation structured?
292 is the dimension series (light-section 29200 spherical-thrust family); 38 encodes the 190 mm bore (bore code x 5). The 270 mm OD and 48 mm height follow the ISO 104 boundary plan for that series.
Can 29238 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, 1,400 r/min, for 29238?
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 29238?
The 190/270/48 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 585 kN / C0a 2230 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.