29414 bearing: complete specifications & equivalents
The 29414 is a ISO 104 radial bearing sized 70 x 150 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 | 70 mm |
| Outer diameter D | 150 mm |
| Width B | 48 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 405 kN |
| Basic static load rating C0 | 1040 kN |
| Fatigue load limit Pu | 87.5 kN |
| Limiting speed (mechanical) | 2200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4190 g |
| Manufacturer designation | NTN 29414 |
| 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 | 2.756 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 1.89 in |
| ISO bore code | 14 |
| Radial section height (D−d)/2 | 40 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) | 3 of 46 |
| Bore above smallest 29400-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29414-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 70×150×48 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 29414 model number is decoded
From the heavy-section 29400 spherical-thrust family, 29414 measures 70 mm through the shaft washer, 150 mm over the outside and 48 mm in assembled height. NTN builds the number from 294 is the dimension series (heavy-section 29400 spherical-thrust family); 14 encodes the 70 mm bore (bore code x 5). With Ca 405 kN and C0a 1040 kN, each mm of bore carries about 5.79 kN of dynamic axial rating. Within the spherical-thrust plan, 292 is the light section and 294 the heavy one; stepping up from a 292 to a 294 at the same bore roughly doubles the C0a class. After filling with oil, rotate slowly and watch torque and temperature; a misrouted oil feed shows up in the first minutes of running.
Typical equipment & failure modes
Common applications
- pellet-mill and grinder main-shaft thrust seats
- ship propulsion and rudder thrust blocks
- large mixer, reactor and agitator vertical shafts
- bulk-handler stacker/reclaimer slew pivots
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
- flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates
- fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact
- 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 70 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 150 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.
- The 48 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.
- Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29414 was chosen for.
- The C0a of 1040 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.
- The Ca 405/C0a 1040 kN ratings and 87.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29414; 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 29414?
29414 is a spherical roller thrust bearing to ISO 104: 70 mm shaft-washer bore, 150 mm outside diameter, 48 mm stack height (2.756 x 5.906 x 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 405 kN, C0a 1040 kN and a 87.5 kN fatigue load limit Pu; limiting speed 2,200 r/min with oil lubrication; mass about 4190 g.
How is the 29414 designation structured?
294 is the dimension series (heavy-section 29400 spherical-thrust family); 14 encodes the 70 mm bore (bore code x 5). The 150 mm OD and 48 mm height follow the ISO 104 boundary plan for that series.
Can 29414 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, 2,200 r/min, for 29414?
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 29414?
The 70/150/48 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 405 kN / C0a 1040 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.