29296 bearing: complete specifications & equivalents
The 29296 is a ISO 104 radial bearing sized 480 x 650 x 103 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 480 mm |
| Outer diameter D | 650 mm |
| Width B | 103 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2350 kN |
| Basic static load rating C0 | 11800 kN |
| Fatigue load limit Pu | 950 kN |
| Reference speed (thermal) | 560 rpm |
| Limiting speed (mechanical) | 900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 98000 g |
| Manufacturer designation | 29296 |
| 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 & 29200-series range
| Bore d | 18.898 in |
|---|---|
| Outer diameter D | 25.591 in |
| Width B | 4.055 in |
| ISO bore code | 96 |
| Radial section height (D−d)/2 | 85 mm |
| Smallest bore in 29200-series | 150 mm |
| Largest outer diameter in 29200-series | 1060 mm |
| Width range across 29200-series | 39–155 mm |
| Bore position in 29200-series (smallest first) | 17 of 23 |
| Bore above smallest 29200-series size | 330 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29296 model number is decoded
Where a cylindrical roller thrust bearing would edge-load under deflection, 29296 aligns itself: 480×650×103 mm envelope, 11800 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29296 is the steel cage of the earlier standard 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 11800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 13) 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
- 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
- roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)
- housing-washer rotation scored into an unmachined or loose seating face
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
- condensation pitting in machines that run intermittently in humid environments
- smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established
Selection pitfalls — read before you substitute
- Above 300 mm bore the minimum load is large (A 13 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 650 mm washer track.
- 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 29296.
- 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 2350/11800 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 13 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.
- The 2350/11800 kN ratings and 98000 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 do E, EM and EF mean on 29296?
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 29296 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 13 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 900 r/min.
Which dimensions does the 29296 have?
A 29296 measures 480 mm bore × 650 mm outside diameter × 103 mm width (18.898 × 25.591 × 4.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2350 kN, static C0 11800 kN, fatigue limit Pu 950 kN, reference speed 560 r/min, limiting speed 900 r/min, mass about 98000 g. Minimum axial load factor A 13 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.