29436 bearing: complete specifications & equivalents
The 29436 is a ISO 104 radial bearing sized 180 x 360 x 109 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 180 mm |
| Outer diameter D | 360 mm |
| Width B | 109 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 2050 kN |
| Basic static load rating C0 | 6200 kN |
| Fatigue load limit Pu | 400 kN |
| Limiting speed (mechanical) | 890 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 52900 g |
| Manufacturer designation | NTN 29436 |
| 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 | 7.087 in |
|---|---|
| Outer diameter D | 14.173 in |
| Width B | 4.291 in |
| ISO bore code | 36 |
| Radial section height (D−d)/2 | 90 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) | 16 of 46 |
| Bore above smallest 29400-series size | 120 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29436-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 180×360×109 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 29436 model number is decoded
29436 is an NTN spherical roller thrust bearing of the heavy-section 29400 spherical-thrust family: 180 mm bore, 360 mm outside diameter, 109 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 36 encodes the 180 mm bore (bore code x 5). At 109 mm of height the bearing packs the heavy-section capacity into a stack far shorter than a comparable multi-row ball arrangement. Against a thrust ball bearing of the same 180 mm bore, this bearing carries many times the load at lower speed — the trade is oil lubrication and price. 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
- large marine propulsion thrust supports
- crane and excavator main slew bearings duty
- rotary kiln and furnace thrust positions
- large vertical mill and crusher main shafts
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
- 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 180 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 360 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.
- Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29436 stack as a set.
- Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29436 was chosen for.
- 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 2050/C0a 6200 kN ratings and 400 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29436; 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 29436?
29436 is a spherical roller thrust bearing to ISO 104: 180 mm shaft-washer bore, 360 mm outside diameter, 109 mm stack height (7.087 x 14.173 x 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2050 kN, C0a 6200 kN and a 400 kN fatigue load limit Pu; limiting speed 890 r/min with oil lubrication; mass about 52900 g.
How is the 29436 designation structured?
294 is the dimension series (heavy-section 29400 spherical-thrust family); 36 encodes the 180 mm bore (bore code x 5). The 360 mm OD and 109 mm height follow the ISO 104 boundary plan for that series.
Can 29436 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, 890 r/min, for 29436?
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 29436?
The 180/360/109 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2050 kN / C0a 6200 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.