29380 bearing: complete specifications & equivalents
The 29380 is a ISO 104 radial bearing sized 400 x 620 x 132 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 400 mm |
| Outer diameter D | 620 mm |
| Width B | 132 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 3450 kN |
| Basic static load rating C0 | 14600 kN |
| Fatigue load limit Pu | 1200 kN |
| Reference speed (thermal) | 530 rpm |
| Limiting speed (mechanical) | 950 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 150000 g |
| Manufacturer designation | 29380 |
| Standard | ISO 104 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 29300-series range
| Bore d | 15.748 in |
|---|---|
| Outer diameter D | 24.409 in |
| Width B | 5.197 in |
| ISO bore code | 80 |
| Radial section height (D−d)/2 | 110 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) | 23 of 31 |
| Bore above smallest 29300-series size | 315 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29380 model number is decoded
Where a cylindrical roller thrust bearing would edge-load under deflection, 29380 aligns itself: 400×620×132 mm envelope, 14600 kN static rating, one load direction. Reading the code: 293 gives the dimension series (medium 293 series) and 80 the 400 mm shaft washer bore (code 80 × 5); the unsuffixed standard execution sets the cage design. A minimum axial load of factor A 20 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 150000 g mass and 132 mm axial height sit between 400 and 620 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 400 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3450 kN working load.
Typical equipment & failure modes
Common applications
- coal mill, cement mill and sugar mill thrust bearings under shock load
- marine shaft and rudder-style thrust positions with seat deflection
- paper machine calender and refiner discs with combined axial and radial force
- crane hook assemblies where the hook block turns under full load
Known failure patterns
- smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established
- washer back-face fretting where the seat is too narrow to support the full ring face
- grease churning and overheating when a high-speed thrust position is over-packed
- rolling-contact fatigue spalling after the catalogue L10 life is exhausted
- cage wear from rollers being dragged through unloaded zones under fluctuating thrust
Selection pitfalls — read before you substitute
- Above 300 mm bore the minimum load is large (A 20 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 620 mm washer track.
- The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.
- the 530 r/min reference speed is the thermal criterion under load, the 950 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.
- The 3450/14600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.
- Minimum load factor A 20 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.
- The 3450/14600 kN ratings and 150000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only.
Frequently asked questions
What is the difference between 292, 293 and 294 series?
292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29380 is the medium 293 series, 400×620×132 mm.
What do E, EM and EF mean on 29380?
They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design.
Where is the 29380 typically used?
Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection.
What destroys a spherical roller thrust bearing?
Unloaded rotation below A 20 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 950 r/min.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings on 2026-09-27. Read our editorial & correction policy.