29356 bearing: complete specifications & equivalents
The 29356 is a ISO 104 radial bearing sized 280 x 440 x 95 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 280 mm |
| Outer diameter D | 440 mm |
| Width B | 95 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 2010 kN |
| Basic static load rating C0 | 7250 kN |
| Fatigue load limit Pu | 480 kN |
| Limiting speed (mechanical) | 790 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 54600 g |
| Manufacturer designation | NTN 29356 |
| 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 & 29300-series range
| Bore d | 11.024 in |
|---|---|
| Outer diameter D | 17.323 in |
| Width B | 3.74 in |
| ISO bore code | 56 |
| Radial section height (D−d)/2 | 80 mm |
| Smallest bore in 29300-series | 85 mm |
| Largest outer diameter in 29300-series | 1180 mm |
| Width range across 29300-series | 39–230 mm |
| Bore position in 29300-series (smallest first) | 17 of 31 |
| Bore above smallest 29300-series size | 195 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29356-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 280×440×95 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 29356 model number is decoded
At 280 x 440 x 95 mm, NTN 29356 sits in the medium-section 29300 spherical-thrust family of the spherical-thrust programme. The designation is 293 is the dimension series (medium-section 29300 spherical-thrust family) plus 56 encodes the 280 mm bore (bore code x 5). Catalogue axial dynamic rating Ca is 2010 kN against C0a 7250 kN — the roller contact line is why a 280 mm bore here out-carries any thrust ball bearing of the same size. Choose the medium-section 29300 spherical-thrust family when heavy thrust meets misalignment: vertical turbines, mills and slew pivots are the classic homes. 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
- heavy stacker/reclaimer and shiploading pivots
- vertical hydro and pump-turbine main thrust blocks
- heavy rolling-mill and forging-press thrust seats
- large marine propulsion thrust supports
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
- contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue
- 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 280 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 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 280 mm bore.
- Oil is not optional at this rating: the 790 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.
- Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 790 r/min end of the range.
- Below the minimum axial load the rollers skid; at 790 r/min the Ca of 2010 kN never comes into play before the raceway is smeared.
- The Ca 2010/C0a 7250 kN ratings and 480 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29356; 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 29356?
29356 is a spherical roller thrust bearing to ISO 104: 280 mm shaft-washer bore, 440 mm outside diameter, 95 mm stack height (11.024 x 17.323 x 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2010 kN, C0a 7250 kN and a 480 kN fatigue load limit Pu; limiting speed 790 r/min with oil lubrication; mass about 54600 g.
How is the 29356 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 56 encodes the 280 mm bore (bore code x 5). The 440 mm OD and 95 mm height follow the ISO 104 boundary plan for that series.
Can 29356 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, 790 r/min, for 29356?
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 29356?
The 280/440/95 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2010 kN / C0a 7250 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.