29324 bearing: complete specifications & equivalents
The 29324 is a ISO 104 radial bearing sized 120 x 210 x 54 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 120 mm |
| Outer diameter D | 210 mm |
| Width B | 54 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 595 kN |
| Basic static load rating C0 | 1770 kN |
| Fatigue load limit Pu | 151 kN |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 7920 g |
| Manufacturer designation | NTN 29324 |
| 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 | 4.724 in |
|---|---|
| Outer diameter D | 8.268 in |
| Width B | 2.126 in |
| ISO bore code | 24 |
| Radial section height (D−d)/2 | 45 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) | 5 of 31 |
| Bore above smallest 29300-series size | 35 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29324-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 120×210×54 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 29324 model number is decoded
29324 is an NTN spherical roller thrust bearing of the medium-section 29300 spherical-thrust family: 120 mm bore, 210 mm outside diameter, 54 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Two fields make up the code — 293 is the dimension series (medium-section 29300 spherical-thrust family) and 24 encodes the 120 mm bore (bore code x 5). At 54 mm of height the bearing packs the medium-section capacity into a stack far shorter than a comparable multi-row ball arrangement. Against a thrust ball bearing of the same 120 mm bore, this bearing carries many times the load at lower speed — the trade is oil lubrication and price. Lift the bearing by the washers, never through the roller set; a 7.9 kg stack punishes improvisation.
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
- 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
- cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces
- thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation
Selection pitfalls — read before you substitute
- At 120 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 120 mm bore.
- Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29324 stack as a set.
- The 54 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.
- 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 595/C0a 1770 kN ratings and 151 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29324; 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 29324?
29324 is a spherical roller thrust bearing to ISO 104: 120 mm shaft-washer bore, 210 mm outside diameter, 54 mm stack height (4.724 x 8.268 x 2.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 595 kN, C0a 1770 kN and a 151 kN fatigue load limit Pu; limiting speed 1,600 r/min with oil lubrication; mass about 7920 g.
How is the 29324 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 24 encodes the 120 mm bore (bore code x 5). The 210 mm OD and 54 mm height follow the ISO 104 boundary plan for that series.
Can 29324 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 29324?
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 29324?
The 120/210/54 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 595 kN / C0a 1770 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.