29492-EM bearing: complete specifications & equivalents
The 29492-EM is a ISO 104 radial bearing sized 460 x 800 x 206 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 | 800 mm |
| Width B | 206 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 9300 kN |
| Basic static load rating C0 | 33500 kN |
| Fatigue load limit Pu | 2450 kN |
| Reference speed (thermal) | 430 rpm |
| Limiting speed (mechanical) | 750 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 425000 g |
| Manufacturer designation | 29492 EM |
| 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 & 29400-series range
| Bore d | 18.11 in |
|---|---|
| Outer diameter D | 31.496 in |
| Width B | 8.11 in |
| ISO bore code | 92 |
| Radial section height (D−d)/2 | 170 mm |
| Smallest bore in 29400-series | 60 mm |
| Largest outer diameter in 29400-series | 1770 mm |
| Width range across 29400-series | 42–426 mm |
| Bore position in 29400-series (smallest first) | 31 of 46 |
| Bore above smallest 29400-series size | 400 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29492-EM model number is decoded
29492 EM is the classic hook-block and screw-end thrust bearing: 460 mm shaft washer bore, 800 mm OD, minimum axial load factor A 100, and free rotation under load thanks to the spherical geometry. The designation 29492 EM separates into 294 (series), 92 (460 mm bore) and EM; washers are separable for individual mounting. A minimum axial load of factor A 100 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. One direction only: 29492 EM cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Verify the minimum axial load (factor A 100) 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
- paper machine calender and refiner discs with combined axial and radial force
- crane hook assemblies where the hook block turns under full load
- injection moulding machine and extruder screw thrust positions
- vertical hydro generators and large vertical pump motors
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 100 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 800 mm washer track.
- the 430 r/min reference speed is the thermal criterion under load, the 750 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.
- Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29492 EM.
- Minimum load factor A 100 dominates commissioning: start the oil flow and preload before rotation, especially on 294 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 9300/33500 kN ratings and 425000 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
Why is the minimum axial load (A 100) so important?
Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 100 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs.
Can the 29492 EM also carry radial load?
Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust.
How is a 29492 EM mounted?
Tight shaft washer on the 460 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 100 preload verified at commissioning.
What are the dimensions and ratings of the 29492 EM?
A 29492 EM measures 460 mm bore × 800 mm outside diameter × 206 mm width (18.11 × 31.496 × 8.11 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9300 kN, static C0 33500 kN, fatigue limit Pu 2450 kN, reference speed 430 r/min, limiting speed 750 r/min, mass about 425000 g. Minimum axial load factor A 100 must be maintained in service.
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.