29244 bearing: complete specifications & equivalents
The 29244 is a ISO 104 radial bearing sized 220 x 300 x 48 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 220 mm |
| Outer diameter D | 300 mm |
| Width B | 48 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 620 kN |
| Basic static load rating C0 | 2480 kN |
| Fatigue load limit Pu | 198 kN |
| Limiting speed (mechanical) | 1300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 9940 g |
| Manufacturer designation | NTN 29244 |
| 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 & 29200-series range
| Bore d | 8.661 in |
|---|---|
| Outer diameter D | 11.811 in |
| Width B | 1.89 in |
| ISO bore code | 44 |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in 29200-series | 150 mm |
| Largest outer diameter in 29200-series | 1060 mm |
| Width range across 29200-series | 39–155 mm |
| Bore position in 29200-series (smallest first) | 7 of 26 |
| Bore above smallest 29200-series size | 70 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29244-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 220×300×48 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 29244 model number is decoded
At 220 x 300 x 48 mm, NTN 29244 sits in the light-section 29200 spherical-thrust family of the spherical-thrust programme. Two fields make up the code — 292 is the dimension series (light-section 29200 spherical-thrust family) and 44 encodes the 220 mm bore (bore code x 5). Asymmetric rollers and the angled contact mean the bearing also tolerates radial load — the catalogue allows a radial share while axial load clearly dominates. For oscillating or slow heavy duty, size from C0a 2480 kN with the static safety factor rather than from the life equation. After filling with oil, rotate slowly and watch torque and temperature; a misrouted oil feed shows up in the first minutes of running.
Typical equipment & failure modes
Common applications
- large marine propulsion thrust supports
- crane and excavator main slew bearings duty
- rotary kiln and furnace thrust positions
- large vertical mill and crusher main shafts
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
- thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation
Selection pitfalls — read before you substitute
- At 220 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 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 220 mm bore it trades capacity for a smaller 300 mm OD and lower height.
- Oil is not optional at this rating: the 1,300 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.
- Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.
- Shock thrust above C0a 2480 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.
- The Ca 620/C0a 2480 kN ratings and 198 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29244; 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 29244?
29244 is a spherical roller thrust bearing to ISO 104: 220 mm shaft-washer bore, 300 mm outside diameter, 48 mm stack height (8.661 x 11.811 x 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 620 kN, C0a 2480 kN and a 198 kN fatigue load limit Pu; limiting speed 1,300 r/min with oil lubrication; mass about 9940 g.
How is the 29244 designation structured?
292 is the dimension series (light-section 29200 spherical-thrust family); 44 encodes the 220 mm bore (bore code x 5). The 300 mm OD and 48 mm height follow the ISO 104 boundary plan for that series.
Can 29244 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, 1,300 r/min, for 29244?
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 29244?
The 220/300/48 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 620 kN / C0a 2480 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.