29352 bearing: complete specifications & equivalents
The 29352 is a ISO 104 radial bearing sized 260 x 420 x 95 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 260 mm |
| Outer diameter D | 420 mm |
| Width B | 95 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 1910 kN |
| Basic static load rating C0 | 6800 kN |
| Fatigue load limit Pu | 445 kN |
| Limiting speed (mechanical) | 810 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 52000 g |
| Manufacturer designation | NTN 29352 |
| 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 | 10.236 in |
|---|---|
| Outer diameter D | 16.535 in |
| Width B | 3.74 in |
| ISO bore code | 52 |
| Radial section height (D−d)/2 | 80 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) | 16 of 31 |
| Bore above smallest 29300-series size | 175 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29352-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 260×420×95 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 29352 model number is decoded
29352 is an NTN spherical roller thrust bearing of the medium-section 29300 spherical-thrust family: 260 mm bore, 420 mm outside diameter, 95 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Reading the code: 293 is the dimension series (medium-section 29300 spherical-thrust family), and 52 encodes the 260 mm bore (bore code x 5). Catalogue mass is about 52 kg for the full washer-and-roller stack. For oscillating or slow heavy duty, size from C0a 6800 kN with the static safety factor rather than from the life equation. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 1910 kN class thrust.
Typical equipment & failure modes
Common applications
- large vertical mill and crusher main shafts
- heavy stacker/reclaimer and shiploading pivots
- vertical hydro and pump-turbine main thrust blocks
- heavy rolling-mill and forging-press thrust seats
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
- fretting on the shaft seat after the washer crept under reversing axial shock
Selection pitfalls — read before you substitute
- At 260 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 260 mm bore.
- The C0a of 6800 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 810 r/min the Ca of 1910 kN never comes into play before the raceway is smeared.
- The 95 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 1910/C0a 6800 kN ratings and 445 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29352; 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 29352?
29352 is a spherical roller thrust bearing to ISO 104: 260 mm shaft-washer bore, 420 mm outside diameter, 95 mm stack height (10.236 x 16.535 x 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1910 kN, C0a 6800 kN and a 445 kN fatigue load limit Pu; limiting speed 810 r/min with oil lubrication; mass about 52000 g.
How is the 29352 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 52 encodes the 260 mm bore (bore code x 5). The 420 mm OD and 95 mm height follow the ISO 104 boundary plan for that series.
Can 29352 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, 810 r/min, for 29352?
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 29352?
The 260/420/95 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1910 kN / C0a 6800 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.