29430 bearing: complete specifications & equivalents
The 29430 is a ISO 104 radial bearing sized 150 x 300 x 90 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 150 mm |
| Outer diameter D | 300 mm |
| Width B | 90 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 1430 kN |
| Basic static load rating C0 | 4350 kN |
| Fatigue load limit Pu | 280 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 30500 g |
| Manufacturer designation | NTN 29430 |
| 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 | 5.906 in |
|---|---|
| Outer diameter D | 11.811 in |
| Width B | 3.543 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 75 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) | 13 of 46 |
| Bore above smallest 29400-series size | 90 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29430-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×300×90 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 29430 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 29430 appears as a heavy-section 29400 spherical-thrust family bearing with a 150 mm shaft washer, 300 mm across the housing washer and 90 mm of height. NTN builds the number from 294 is the dimension series (heavy-section 29400 spherical-thrust family); 30 encodes the 150 mm bore (bore code x 5). With Ca 1430 kN and C0a 4350 kN, each mm of bore carries about 9.53 kN of dynamic axial rating. Where the shaft also needs radial location, pair this bearing with a spherical roller or cylindrical radial bearing — the thrust bearing is not a radial guide. 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
- rotary kiln and furnace thrust positions
- large vertical mill and crusher main shafts
- heavy stacker/reclaimer and shiploading pivots
- vertical hydro and pump-turbine main thrust blocks
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
- fretting on the shaft seat after the washer crept under reversing axial shock
- 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 150 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 294 heavy section tops the plan at this bore with the largest 300 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.
- Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.
- Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.
- The C0a of 4350 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.
- The Ca 1430/C0a 4350 kN ratings and 280 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29430; 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 29430?
29430 is a spherical roller thrust bearing to ISO 104: 150 mm shaft-washer bore, 300 mm outside diameter, 90 mm stack height (5.906 x 11.811 x 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1430 kN, C0a 4350 kN and a 280 kN fatigue load limit Pu; limiting speed 1,100 r/min with oil lubrication; mass about 30500 g.
How is the 29430 designation structured?
294 is the dimension series (heavy-section 29400 spherical-thrust family); 30 encodes the 150 mm bore (bore code x 5). The 300 mm OD and 90 mm height follow the ISO 104 boundary plan for that series.
Can 29430 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, 1,100 r/min, for 29430?
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 29430?
The 150/300/90 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1430 kN / C0a 4350 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.