29336 bearing: complete specifications & equivalents
The 29336 is a ISO 104 radial bearing sized 180 x 300 x 73 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 | 300 mm |
| Width B | 73 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 1110 kN |
| Basic static load rating C0 | 3600 kN |
| Fatigue load limit Pu | 272 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 21200 g |
| Manufacturer designation | NTN 29336 |
| 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 | 7.087 in |
|---|---|
| Outer diameter D | 11.811 in |
| Width B | 2.874 in |
| ISO bore code | 36 |
| Radial section height (D−d)/2 | 60 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) | 11 of 31 |
| Bore above smallest 29300-series size | 95 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29336-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 180×300×73 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 29336 model number is decoded
29336 is the 180 mm member of NTN's medium-section 29300 spherical-thrust family: 300 mm over the housing washer, 73 mm tall. Reading the code: 293 is the dimension series (medium-section 29300 spherical-thrust family), and 36 encodes the 180 mm bore (bore code x 5). Catalogue mass is about 21 kg for the full washer-and-roller stack. Minimum axial load matters here too: at speed the rollers skid on a lightly loaded bearing, so check the catalogue minimum-load formula before downsizing the thrust spring. 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
- 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
- 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
- fretting on the shaft seat after the washer crept under reversing axial shock
- fretting on the shaft seat after the washer crept under reversing axial shock
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 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 180 mm bore.
- Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 1,100 r/min end of the range.
- Shock thrust above C0a 3600 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.
- The 73 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 Ca 1110/C0a 3600 kN ratings and 272 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29336; 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 29336?
29336 is a spherical roller thrust bearing to ISO 104: 180 mm shaft-washer bore, 300 mm outside diameter, 73 mm stack height (7.087 x 11.811 x 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1110 kN, C0a 3600 kN and a 272 kN fatigue load limit Pu; limiting speed 1,100 r/min with oil lubrication; mass about 21200 g.
How is the 29336 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 36 encodes the 180 mm bore (bore code x 5). The 300 mm OD and 73 mm height follow the ISO 104 boundary plan for that series.
Can 29336 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 29336?
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 29336?
The 180/300/73 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1110 kN / C0a 3600 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.