29456-E bearing: complete specifications & equivalents
The 29456-E is a ISO 104 radial bearing sized 280 x 520 x 145 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 280 mm |
| Outer diameter D | 520 mm |
| Width B | 145 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 4900 kN |
| Basic static load rating C0 | 15300 kN |
| Fatigue load limit Pu | 1320 kN |
| Reference speed (thermal) | 670 rpm |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 135000 g |
| Manufacturer designation | 29456 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 | 11.024 in |
|---|---|
| Outer diameter D | 20.472 in |
| Width B | 5.709 in |
| ISO bore code | 56 |
| Radial section height (D−d)/2 | 120 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) | 22 of 46 |
| Bore above smallest 29400-series size | 220 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29456-E model number is decoded
SKF supplies 29456 E for very heavy one-direction axial load: 4900 kN dynamic and 15300 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. In 29456 E, the 294 series fixes the 520 mm OD and 145 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 56 selects the 280 mm seat. A minimum axial load of factor A 22 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. Minimum axial load is explicit at factor A 22: 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. Mounting: fit the shaft washer tight on the 280 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 4900 kN working load.
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
- smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established
- housing-washer rotation scored into an unmachined or loose seating face
- abrasive paste forming as dust bypasses the housing seals into the open washer set
- 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
- At 280 mm bore, oil flow becomes the design variable: the 4900 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.
- E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.
- The 4900/15300 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.
- 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 670 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.
- The 4900/15300 kN ratings and 135000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); 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 22) so important?
Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 22 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs.
Can the 29456 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 29456 E mounted?
Tight shaft washer on the 280 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 22 preload verified at commissioning.
What are the dimensions and ratings of the 29456 E?
A 29456 E measures 280 mm bore × 520 mm outside diameter × 145 mm width (11.024 × 20.472 × 5.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4900 kN, static C0 15300 kN, fatigue limit Pu 1320 kN, reference speed 670 r/min, limiting speed 1,200 r/min, mass about 135000 g. Minimum axial load factor A 22 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.