29317 bearing: complete specifications & equivalents
The 29317 is a ISO 104 radial bearing sized 85 x 150 x 39 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 85 mm |
| Outer diameter D | 150 mm |
| Width B | 39 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 295 kN |
| Basic static load rating C0 | 820 kN |
| Fatigue load limit Pu | 78.5 kN |
| Limiting speed (mechanical) | 2300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2940 g |
| Manufacturer designation | NTN 29317 |
| 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 | 3.346 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 1.535 in |
| ISO bore code | 17 |
| Radial section height (D−d)/2 | 32.5 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) | 1 of 31 |
| Bore above smallest 29300-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29317-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×150×39 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 29317 model number is decoded
29317 is an NTN spherical roller thrust bearing of the medium-section 29300 spherical-thrust family: 85 mm bore, 150 mm outside diameter, 39 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Decoding 29317: 293 is the dimension series (medium-section 29300 spherical-thrust family), with 17 encodes the 85 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. Within the spherical-thrust plan, 292 is the light section and 294 the heavy one; stepping up from a 292 to a 294 at the same bore roughly doubles the C0a class. Fill the housing with the specified oil to the level that reaches the cage — these bearings are oil-bath or circulation machines, not grease machines.
Typical equipment & failure modes
Common applications
- ship propulsion and rudder thrust blocks
- large mixer, reactor and agitator vertical shafts
- bulk-handler stacker/reclaimer slew pivots
- vertical hydro-turbine and large pump thrust supports
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
- contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue
- cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces
Selection pitfalls — read before you substitute
- Bearings of 85 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 85 mm bore.
- The C0a of 820 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.
- Oil is not optional at this rating: the 2,300 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.
- Shock thrust above C0a 820 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.
- The Ca 295/C0a 820 kN ratings and 78.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29317; 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 29317?
29317 is a spherical roller thrust bearing to ISO 104: 85 mm shaft-washer bore, 150 mm outside diameter, 39 mm stack height (3.346 x 5.906 x 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 295 kN, C0a 820 kN and a 78.5 kN fatigue load limit Pu; limiting speed 2,300 r/min with oil lubrication; mass about 2940 g.
How is the 29317 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 17 encodes the 85 mm bore (bore code x 5). The 150 mm OD and 39 mm height follow the ISO 104 boundary plan for that series.
Can 29317 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, 2,300 r/min, for 29317?
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 29317?
The 85/150/39 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 295 kN / C0a 820 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.