29236 bearing: complete specifications & equivalents
The 29236 is a ISO 104 radial bearing sized 180 x 250 x 42 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 | 250 mm |
| Width B | 42 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 500 kN |
| Basic static load rating C0 | 1920 kN |
| Fatigue load limit Pu | 160 kN |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 6270 g |
| Manufacturer designation | NTN 29236 |
| 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 & 29200-series range
| Bore d | 7.087 in |
|---|---|
| Outer diameter D | 9.843 in |
| Width B | 1.654 in |
| ISO bore code | 36 |
| Radial section height (D−d)/2 | 35 mm |
| Smallest bore in 29200-series | 150 mm |
| Largest outer diameter in 29200-series | 1060 mm |
| Width range across 29200-series | 39–155 mm |
| Bore position in 29200-series (smallest first) | 4 of 26 |
| Bore above smallest 29200-series size | 30 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29236-E | SKF | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
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 29236 model number is decoded
The light-section 29200 spherical-thrust family entry 29236 combines a spherical housing-washer raceway with asymmetric barrel rollers in 42 mm of stack height. Two fields make up the code — 292 is the dimension series (light-section 29200 spherical-thrust family) and 36 encodes the 180 mm bore (bore code x 5). Asymmetric rollers and the angled contact mean the bearing also tolerates radial load — the catalogue allows a radial share while axial load clearly dominates. 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. The 180 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
- 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
- roller skid smearing when axial load fell below the minimum while the shaft was still turning fast
- thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation
- thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation
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 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 180 mm bore it trades capacity for a smaller 250 mm OD and lower height.
- The 42 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.
- The 42 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.
- Shock thrust above C0a 1920 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.
- The Ca 500/C0a 1920 kN ratings and 160 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29236; 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 29236?
29236 is a spherical roller thrust bearing to ISO 104: 180 mm shaft-washer bore, 250 mm outside diameter, 42 mm stack height (7.087 x 9.843 x 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 500 kN, C0a 1920 kN and a 160 kN fatigue load limit Pu; limiting speed 1,600 r/min with oil lubrication; mass about 6270 g.
How is the 29236 designation structured?
292 is the dimension series (light-section 29200 spherical-thrust family); 36 encodes the 180 mm bore (bore code x 5). The 250 mm OD and 42 mm height follow the ISO 104 boundary plan for that series.
Can 29236 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, 1,600 r/min, for 29236?
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 29236?
The 180/250/42 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 500 kN / C0a 1920 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.