29328 bearing: complete specifications & equivalents
The 29328 is a ISO 104 radial bearing sized 140 x 240 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 | 140 mm |
| Outer diameter D | 240 mm |
| Width B | 60 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 760 kN |
| Basic static load rating C0 | 2360 kN |
| Fatigue load limit Pu | 182 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 11400 g |
| Manufacturer designation | NTN 29328 |
| 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 | 5.512 in |
|---|---|
| Outer diameter D | 9.449 in |
| Width B | 2.362 in |
| ISO bore code | 28 |
| 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) | 7 of 31 |
| Bore above smallest 29300-series size | 55 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29328-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 140×240×60 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 29328 model number is decoded
At 140 x 240 x 60 mm, NTN 29328 sits in the medium-section 29300 spherical-thrust family of the spherical-thrust programme. Reading the code: 293 is the dimension series (medium-section 29300 spherical-thrust family), and 28 encodes the 140 mm bore (bore code x 5). Catalogue mass is about 11 kg for the full washer-and-roller stack. Selection starts from the load case: axial must dominate, and any radial share must stay within the catalogue combined-load rule while the bearing self-aligns. Fill the housing with the specified oil to the level that reaches the cage — these bearings are oil-bath or circulation machines, not grease machines.
Typical equipment & failure modes
Common applications
- vertical hydro and pump-turbine main thrust blocks
- heavy rolling-mill and forging-press thrust seats
- large marine propulsion thrust supports
- crane and excavator main slew bearings duty
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
- contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue
- fretting on the shaft seat after the washer crept under reversing axial shock
Selection pitfalls — read before you substitute
- At 140 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 140 mm bore.
- Below the minimum axial load the rollers skid; at 1,400 r/min the Ca of 760 kN never comes into play before the raceway is smeared.
- Oil is not optional at this rating: the 1,400 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.
- The 60 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 760/C0a 2360 kN ratings and 182 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29328; 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 29328?
29328 is a spherical roller thrust bearing to ISO 104: 140 mm shaft-washer bore, 240 mm outside diameter, 60 mm stack height (5.512 x 9.449 x 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 760 kN, C0a 2360 kN and a 182 kN fatigue load limit Pu; limiting speed 1,400 r/min with oil lubrication; mass about 11400 g.
How is the 29328 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 28 encodes the 140 mm bore (bore code x 5). The 240 mm OD and 60 mm height follow the ISO 104 boundary plan for that series.
Can 29328 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 29328?
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 29328?
The 140/240/60 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 760 kN / C0a 2360 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.