29320 bearing: complete specifications & equivalents
The 29320 is a ISO 104 radial bearing sized 100 x 170 x 42 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 100 mm |
| Outer diameter D | 170 mm |
| Width B | 42 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 385 kN |
| Basic static load rating C0 | 1160 kN |
| Fatigue load limit Pu | 96 kN |
| Limiting speed (mechanical) | 2100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3940 g |
| Manufacturer designation | NTN 29320 |
| 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 | 3.937 in |
|---|---|
| Outer diameter D | 6.693 in |
| Width B | 1.654 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 35 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) | 3 of 31 |
| Bore above smallest 29300-series size | 15 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29320-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 100×170×42 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 29320 model number is decoded
The medium-section 29300 spherical-thrust family entry 29320 combines a spherical housing-washer raceway with asymmetric barrel rollers in 42 mm of stack height. Decoding 29320: 293 is the dimension series (medium-section 29300 spherical-thrust family), with 20 encodes the 100 mm bore (bore code x 5). The single printed speed, 2,100 r/min, is an oil-lubrication figure: the catalogue greases these bearings only for the smallest duties, and this size is rated for oil. Choose the medium-section 29300 spherical-thrust family when heavy thrust meets misalignment: vertical turbines, mills and slew pivots are the classic homes. 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
- large mixer, reactor and agitator vertical shafts
- bulk-handler stacker/reclaimer slew pivots
- vertical hydro-turbine and large pump thrust supports
- rolling-mill screwdown and backup-roll thrust positions
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
- cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces
Selection pitfalls — read before you substitute
- Bearings of 100 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.
- The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 100 mm bore.
- Shock thrust above C0a 1160 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.
- The C0a of 1160 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.
- Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 2,100 r/min end of the range.
- The Ca 385/C0a 1160 kN ratings and 96 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29320; 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 29320?
29320 is a spherical roller thrust bearing to ISO 104: 100 mm shaft-washer bore, 170 mm outside diameter, 42 mm stack height (3.937 x 6.693 x 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 385 kN, C0a 1160 kN and a 96 kN fatigue load limit Pu; limiting speed 2,100 r/min with oil lubrication; mass about 3940 g.
How is the 29320 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 20 encodes the 100 mm bore (bore code x 5). The 170 mm OD and 42 mm height follow the ISO 104 boundary plan for that series.
Can 29320 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, 2,100 r/min, for 29320?
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 29320?
The 100/170/42 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 385 kN / C0a 1160 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.