29424-E bearing: complete specifications & equivalents
The 29424-E is a ISO 104 radial bearing sized 120 x 250 x 78 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 120 mm |
| Outer diameter D | 250 mm |
| Width B | 78 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1370 kN |
| Basic static load rating C0 | 3450 kN |
| Fatigue load limit Pu | 375 kN |
| Reference speed (thermal) | 1500 rpm |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 17500 g |
| Manufacturer designation | 29424 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 | 4.724 in |
|---|---|
| Outer diameter D | 9.843 in |
| Width B | 3.071 in |
| ISO bore code | 24 |
| Radial section height (D−d)/2 | 65 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) | 10 of 46 |
| Bore above smallest 29400-series size | 60 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29424-E model number is decoded
In SKF catalogue PUB BU/P1 17000, 29424 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 78 mm of axial section. In 29424 E, the 294 series fixes the 250 mm OD and 78 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 24 selects the 120 mm seat. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Selection arithmetic: C 1370 kN against C0 3450 kN gives a C0/C ratio of 2.52 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.
Typical equipment & failure modes
Common applications
- 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
- coal mill, cement mill and sugar mill thrust bearings under shock load
Known failure patterns
- cage wear from rollers being dragged through unloaded zones under fluctuating thrust
- housing-washer rotation scored into an unmachined or loose seating face
- grease churning and overheating when a high-speed thrust position is over-packed
- electrical erosion of raceways on VFD-driven shafts without grounding or insulation
- roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)
Selection pitfalls — read before you substitute
- At 120 mm bore the 294 bearing already weighs 17.5 kg and sits 78 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.
- the 1,500 r/min reference speed is the thermal criterion under load, the 2,600 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 29424 E.
- 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.
- Minimum load factor A 1.1 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.
- The 1370/3450 kN ratings and 17500 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
Why is the minimum axial load (A 1.1) so important?
Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 1.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs.
Can the 29424 E 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 29424 E mounted?
Tight shaft washer on the 120 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 1.1 preload verified at commissioning.
What are the dimensions and ratings of the 29424 E?
A 29424 E measures 120 mm bore × 250 mm outside diameter × 78 mm width (4.724 × 9.843 × 3.071 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1370 kN, static C0 3450 kN, fatigue limit Pu 375 kN, reference speed 1,500 r/min, limiting speed 2,600 r/min, mass about 17500 g. Minimum axial load factor A 1.1 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.