29240 bearing: complete specifications & equivalents
The 29240 is a ISO 104 radial bearing sized 200 x 280 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 | 200 mm |
| Outer diameter D | 280 mm |
| Width B | 48 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 595 kN |
| Basic static load rating C0 | 2300 kN |
| Fatigue load limit Pu | 183 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 9140 g |
| Manufacturer designation | NTN 29240 |
| 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 | 7.874 in |
|---|---|
| Outer diameter D | 11.024 in |
| Width B | 1.89 in |
| ISO bore code | 40 |
| 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) | 6 of 26 |
| Bore above smallest 29200-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29240-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 200×280×48 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 29240 model number is decoded
29240 is an NTN spherical roller thrust bearing of the light-section 29200 spherical-thrust family: 200 mm bore, 280 mm outside diameter, 48 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Decoding 29240: 292 is the dimension series (light-section 29200 spherical-thrust family), with 40 encodes the 200 mm bore (bore code x 5). Catalogue axial dynamic rating Ca is 595 kN against C0a 2300 kN — the roller contact line is why a 200 mm bore here out-carries any thrust ball bearing of the same size. 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. The 200 mm shaft washer normally mounts with a tight shaft fit; support the housing washer so it stays free to align on its spherical seat.
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
- cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue
- roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing
- 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
- cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces
Selection pitfalls — read before you substitute
- At 200 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 200 mm bore it trades capacity for a smaller 280 mm OD and lower height.
- The C0a of 2300 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.
- 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.
- Below the minimum axial load the rollers skid; at 1,400 r/min the Ca of 595 kN never comes into play before the raceway is smeared.
- The Ca 595/C0a 2300 kN ratings and 183 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29240; 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 29240?
29240 is a spherical roller thrust bearing to ISO 104: 200 mm shaft-washer bore, 280 mm outside diameter, 48 mm stack height (7.874 x 11.024 x 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 595 kN, C0a 2300 kN and a 183 kN fatigue load limit Pu; limiting speed 1,400 r/min with oil lubrication; mass about 9140 g.
How is the 29240 designation structured?
292 is the dimension series (light-section 29200 spherical-thrust family); 40 encodes the 200 mm bore (bore code x 5). The 280 mm OD and 48 mm height follow the ISO 104 boundary plan for that series.
Can 29240 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 29240?
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 29240?
The 200/280/48 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 595 kN / C0a 2300 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.