29422 bearing: complete specifications & equivalents
The 29422 is a ISO 104 radial bearing sized 110 x 230 x 73 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 110 mm |
| Outer diameter D | 230 mm |
| Width B | 73 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 940 kN |
| Basic static load rating C0 | 2620 kN |
| Fatigue load limit Pu | 193 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 15000 g |
| Manufacturer designation | NTN 29422 |
| 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 | 4.331 in |
|---|---|
| Outer diameter D | 9.055 in |
| Width B | 2.874 in |
| ISO bore code | 22 |
| Radial section height (D−d)/2 | 60 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) | 9 of 46 |
| Bore above smallest 29400-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29422-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 110×230×73 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 29422 model number is decoded
29422 is an NTN spherical roller thrust bearing of the heavy-section 29400 spherical-thrust family: 110 mm bore, 230 mm outside diameter, 73 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. NTN builds the number from 294 is the dimension series (heavy-section 29400 spherical-thrust family); 22 encodes the 110 mm bore (bore code x 5). With Ca 940 kN and C0a 2620 kN, each mm of bore carries about 8.55 kN of dynamic axial rating. For oscillating or slow heavy duty, size from C0a 2620 kN with the static safety factor rather than from the life equation. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 940 kN class thrust.
Typical equipment & failure modes
Common applications
- vertical hydro-turbine and large pump thrust supports
- rolling-mill screwdown and backup-roll thrust positions
- large crane and excavator slew thrust rings
- pellet-mill and grinder main-shaft thrust seats
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
- roller skid smearing when axial load fell below the minimum while the shaft was still turning fast
- contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue
- fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact
Selection pitfalls — read before you substitute
- Bearings of 110 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.
- The 294 heavy section tops the plan at this bore with the largest 230 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.
- 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 73 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.
- The C0a of 2620 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.
- The Ca 940/C0a 2620 kN ratings and 193 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29422; 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 29422?
29422 is a spherical roller thrust bearing to ISO 104: 110 mm shaft-washer bore, 230 mm outside diameter, 73 mm stack height (4.331 x 9.055 x 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 940 kN, C0a 2620 kN and a 193 kN fatigue load limit Pu; limiting speed 1,400 r/min with oil lubrication; mass about 15000 g.
How is the 29422 designation structured?
294 is the dimension series (heavy-section 29400 spherical-thrust family); 22 encodes the 110 mm bore (bore code x 5). The 230 mm OD and 73 mm height follow the ISO 104 boundary plan for that series.
Can 29422 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 29422?
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 29422?
The 110/230/73 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 940 kN / C0a 2620 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.