29392 bearing: complete specifications & equivalents
The 29392 is a ISO 104 radial bearing sized 460 x 710 x 150 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 460 mm |
| Outer diameter D | 710 mm |
| Width B | 150 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 4310 kN |
| Basic static load rating C0 | 19000 kN |
| Fatigue load limit Pu | 1500 kN |
| Reference speed (thermal) | 450 rpm |
| Limiting speed (mechanical) | 800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 215000 g |
| Manufacturer designation | 29392 |
| 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 | 18.11 in |
|---|---|
| Outer diameter D | 27.953 in |
| Width B | 5.906 in |
| ISO bore code | 92 |
| Radial section height (D−d)/2 | 125 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) | 26 of 31 |
| Bore above smallest 29300-series size | 375 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29392 model number is decoded
29392 is the classic hook-block and screw-end thrust bearing: 460 mm shaft washer bore, 710 mm OD, minimum axial load factor A 34, and free rotation under load thanks to the spherical geometry. Reading the code: 293 gives the dimension series (medium 293 series) and 92 the 460 mm shaft washer bore (code 92 × 5); the unsuffixed standard execution sets the cage design. A minimum axial load of factor A 34 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. Minimum axial load is explicit at factor A 34: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 34) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.
Typical equipment & failure modes
Common applications
- vertical hydro generators and large vertical pump motors
- 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
Known failure patterns
- cage wear from rollers being dragged through unloaded zones under fluctuating thrust
- shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder
- grease churning and overheating when a high-speed thrust position is over-packed
- condensation pitting in machines that run intermittently in humid environments
- roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)
Selection pitfalls — read before you substitute
- Above 300 mm bore the minimum load is large (A 34 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 710 mm washer track.
- The 4310/19000 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 34 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.
- 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 450 r/min reference speed is the thermal criterion under load, the 800 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.
- The 4310/19000 kN ratings and 215000 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. 29392 is the medium 293 series, 460×710×150 mm.
What do E, EM and EF mean on 29392?
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 29392 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 34 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 800 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.