29428 bearing: complete specifications & equivalents
The 29428 is a ISO 104 radial bearing sized 140 x 280 x 85 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 140 mm |
| Outer diameter D | 280 mm |
| Width B | 85 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 1240 kN |
| Basic static load rating C0 | 3750 kN |
| Fatigue load limit Pu | 252 kN |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 25200 g |
| Manufacturer designation | NTN 29428 |
| 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 | 5.512 in |
|---|---|
| Outer diameter D | 11.024 in |
| Width B | 3.346 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 70 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) | 12 of 46 |
| Bore above smallest 29400-series size | 80 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29428-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 140×280×85 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 29428 model number is decoded
From the heavy-section 29400 spherical-thrust family, 29428 measures 140 mm through the shaft washer, 280 mm over the outside and 85 mm in assembled height. The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 28 encodes the 140 mm bore (bore code x 5). At 85 mm of height the bearing packs the heavy-section capacity into a stack far shorter than a comparable multi-row ball arrangement. The 140/280/85 envelope follows ISO 104, so dimensional interchange holds between makers; osculation, roller profile and ratings do not automatically follow. The 140 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
- large vertical mill and crusher main shafts
- heavy stacker/reclaimer and shiploading pivots
- vertical hydro and pump-turbine main thrust blocks
- heavy rolling-mill and forging-press 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
- cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces
- contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue
Selection pitfalls — read before you substitute
- At 140 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 280 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.
- Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.
- Below the minimum axial load the rollers skid; at 1,200 r/min the Ca of 1240 kN never comes into play before the raceway is smeared.
- Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.
- The Ca 1240/C0a 3750 kN ratings and 252 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29428; 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 29428?
29428 is a spherical roller thrust bearing to ISO 104: 140 mm shaft-washer bore, 280 mm outside diameter, 85 mm stack height (5.512 x 11.024 x 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1240 kN, C0a 3750 kN and a 252 kN fatigue load limit Pu; limiting speed 1,200 r/min with oil lubrication; mass about 25200 g.
How is the 29428 designation structured?
294 is the dimension series (heavy-section 29400 spherical-thrust family); 28 encodes the 140 mm bore (bore code x 5). The 280 mm OD and 85 mm height follow the ISO 104 boundary plan for that series.
Can 29428 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, 1,200 r/min, for 29428?
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 29428?
The 140/280/85 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1240 kN / C0a 3750 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.