29364 bearing: complete specifications & equivalents
The 29364 is a ISO 104 radial bearing sized 320 x 500 x 109 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 320 mm |
| Outer diameter D | 500 mm |
| Width B | 109 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 2470 kN |
| Basic static load rating C0 | 8800 kN |
| Fatigue load limit Pu | 605 kN |
| Limiting speed (mechanical) | 680 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 79900 g |
| Manufacturer designation | NTN 29364 |
| 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 | 12.598 in |
|---|---|
| Outer diameter D | 19.685 in |
| Width B | 4.291 in |
| ISO bore code | 64 |
| Radial section height (D−d)/2 | 90 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) | 19 of 31 |
| Bore above smallest 29300-series size | 235 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29364-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 320×500×109 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 29364 model number is decoded
29364 is the 320 mm member of NTN's medium-section 29300 spherical-thrust family: 500 mm over the housing washer, 109 mm tall. The designation is 293 is the dimension series (medium-section 29300 spherical-thrust family) plus 64 encodes the 320 mm bore (bore code x 5). Catalogue axial dynamic rating Ca is 2470 kN against C0a 8800 kN — the roller contact line is why a 320 mm bore here out-carries any thrust ball bearing of the same size. The 320/500/109 envelope follows ISO 104, so dimensional interchange holds between makers; osculation, roller profile and ratings do not automatically follow. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat.
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
- fretting on the shaft seat after the washer crept under reversing axial shock
- 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 320 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 320 mm bore.
- Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.
- The C0a of 8800 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.
- Below the minimum axial load the rollers skid; at 680 r/min the Ca of 2470 kN never comes into play before the raceway is smeared.
- The Ca 2470/C0a 8800 kN ratings and 605 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29364; 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 29364?
29364 is a spherical roller thrust bearing to ISO 104: 320 mm shaft-washer bore, 500 mm outside diameter, 109 mm stack height (12.598 x 19.685 x 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2470 kN, C0a 8800 kN and a 605 kN fatigue load limit Pu; limiting speed 680 r/min with oil lubrication; mass about 79900 g.
How is the 29364 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 64 encodes the 320 mm bore (bore code x 5). The 500 mm OD and 109 mm height follow the ISO 104 boundary plan for that series.
Can 29364 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, 680 r/min, for 29364?
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 29364?
The 320/500/109 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2470 kN / C0a 8800 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.