29420-E bearing: complete specifications & equivalents
The 29420-E is a ISO 104 radial bearing sized 100 x 210 x 67 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 100 mm |
| Outer diameter D | 210 mm |
| Width B | 67 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 980 kN |
| Basic static load rating C0 | 2500 kN |
| Fatigue load limit Pu | 275 kN |
| Reference speed (thermal) | 1700 rpm |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 10500 g |
| Manufacturer designation | 29420 E |
| 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 | 3.937 in |
|---|---|
| Outer diameter D | 8.268 in |
| Width B | 2.638 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 55 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) | 8 of 46 |
| Bore above smallest 29400-series size | 40 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29420-E model number is decoded
In SKF catalogue PUB BU/P1 17000, 29420 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 67 mm of axial section. Reading the code: 294 gives the dimension series (heavy 294 series) and 20 the 100 mm shaft washer bore (code 20 × 5); the E sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 2500 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 100 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 980 kN working load.
Typical equipment & failure modes
Common applications
- 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
- injection moulding machine and extruder screw thrust positions
Known failure patterns
- smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established
- shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
- hard-particle indentation where oil or grease filtration is inadequate
- cage wear from rollers being dragged through unloaded zones under fluctuating thrust
Selection pitfalls — read before you substitute
- At 100 mm bore the 294 bearing already weighs 10.5 kg and sits 67 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.
- 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 1,700 r/min reference speed is the thermal criterion under load, the 3,000 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.
- Minimum load factor A 0.59 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.
- 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 29420 E.
- The 980/2500 kN ratings and 10500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); 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. 29420 E is the heavy 294 series, 100×210×67 mm.
What do E, EM and EF mean on 29420 E?
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 stamped steel E window cage.
Where is the 29420 E 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 0.59 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 3,000 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.