29326 bearing: complete specifications & equivalents
The 29326 is a ISO 104 radial bearing sized 130 x 225 x 58 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 130 mm |
| Outer diameter D | 225 mm |
| Width B | 58 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 685 kN |
| Basic static load rating C0 | 2100 kN |
| Fatigue load limit Pu | 168 kN |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 9760 g |
| Manufacturer designation | NTN 29326 |
| 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 | 5.118 in |
|---|---|
| Outer diameter D | 8.858 in |
| Width B | 2.283 in |
| ISO bore code | 26 |
| Radial section height (D−d)/2 | 47.5 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) | 6 of 31 |
| Bore above smallest 29300-series size | 45 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29326-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 130×225×58 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 29326 model number is decoded
NTN 29326 belongs to the medium-section 29300 spherical-thrust family of spherical roller thrust bearings: 130 / 225 / 58 mm (bore / OD / height). NTN builds the number from 293 is the dimension series (medium-section 29300 spherical-thrust family); 26 encodes the 130 mm bore (bore code x 5). The spherical housing raceway lets the shaft washer align itself as the seats settle — the property that keeps the 2100 kN static rating honest in real housings. If speed climbs toward the 1,500 r/min oil rating, the lubrication design — bath, circulation, cooling — becomes the real selection criterion. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 685 kN class thrust.
Typical equipment & failure modes
Common applications
- crane and excavator main slew bearings duty
- rotary kiln and furnace thrust positions
- large vertical mill and crusher main shafts
- heavy stacker/reclaimer and shiploading pivots
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
- fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact
- fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact
Selection pitfalls — read before you substitute
- At 130 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 130 mm bore.
- A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.
- A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.
- Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.
- The Ca 685/C0a 2100 kN ratings and 168 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29326; 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 29326?
29326 is a spherical roller thrust bearing to ISO 104: 130 mm shaft-washer bore, 225 mm outside diameter, 58 mm stack height (5.118 x 8.858 x 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 685 kN, C0a 2100 kN and a 168 kN fatigue load limit Pu; limiting speed 1,500 r/min with oil lubrication; mass about 9760 g.
How is the 29326 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 26 encodes the 130 mm bore (bore code x 5). The 225 mm OD and 58 mm height follow the ISO 104 boundary plan for that series.
Can 29326 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, 1,500 r/min, for 29326?
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 29326?
The 130/225/58 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 685 kN / C0a 2100 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.