29330 bearing: complete specifications & equivalents
The 29330 is a ISO 104 radial bearing sized 150 x 250 x 60 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 150 mm |
| Outer diameter D | 250 mm |
| Width B | 60 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 750 kN |
| Basic static load rating C0 | 2390 kN |
| Fatigue load limit Pu | 191 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 12000 g |
| Manufacturer designation | NTN 29330 |
| 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 | 5.906 in |
|---|---|
| Outer diameter D | 9.843 in |
| Width B | 2.362 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 50 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) | 8 of 31 |
| Bore above smallest 29300-series size | 65 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29330-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×250×60 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 29330 model number is decoded
From the medium-section 29300 spherical-thrust family, 29330 measures 150 mm through the shaft washer, 250 mm over the outside and 60 mm in assembled height. The designation is 293 is the dimension series (medium-section 29300 spherical-thrust family) plus 30 encodes the 150 mm bore (bore code x 5). The static/dynamic ratio of 3.19 tells the story of a roller raceway: enormous reserve for slow, shocked or oscillating thrust. Against a thrust ball bearing of the same 150 mm bore, this bearing carries many times the load at lower speed — the trade is oil lubrication and price. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 750 kN class thrust.
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
- 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 150 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 150 mm bore.
- Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29330 stack as a set.
- Below the minimum axial load the rollers skid; at 1,400 r/min the Ca of 750 kN never comes into play before the raceway is smeared.
- A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.
- The Ca 750/C0a 2390 kN ratings and 191 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29330; 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 29330?
29330 is a spherical roller thrust bearing to ISO 104: 150 mm shaft-washer bore, 250 mm outside diameter, 60 mm stack height (5.906 x 9.843 x 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 750 kN, C0a 2390 kN and a 191 kN fatigue load limit Pu; limiting speed 1,400 r/min with oil lubrication; mass about 12000 g.
How is the 29330 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 30 encodes the 150 mm bore (bore code x 5). The 250 mm OD and 60 mm height follow the ISO 104 boundary plan for that series.
Can 29330 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, 1,400 r/min, for 29330?
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 29330?
The 150/250/60 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 750 kN / C0a 2390 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.