29272 bearing: complete specifications & equivalents
The 29272 is a ISO 104 radial bearing sized 360 x 500 x 85 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 360 mm |
| Outer diameter D | 500 mm |
| Width B | 85 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1460 kN |
| Basic static load rating C0 | 6800 kN |
| Fatigue load limit Pu | 585 kN |
| Reference speed (thermal) | 750 rpm |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 52000 g |
| Manufacturer designation | 29272 |
| 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 | 14.173 in |
|---|---|
| Outer diameter D | 19.685 in |
| Width B | 3.346 in |
| ISO bore code | 72 |
| Radial section height (D−d)/2 | 70 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) | 11 of 23 |
| Bore above smallest 29200-series size | 210 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29272 model number is decoded
SKF supplies 29272 for very heavy one-direction axial load: 1460 kN dynamic and 6800 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. Reading the code: 292 gives the dimension series (high-speed 292 series) and 72 the 360 mm shaft washer bore (code 72 × 5); the unsuffixed standard execution 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 6800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.
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
- cage wear from rollers being dragged through unloaded zones under fluctuating thrust
- washer back-face fretting where the seat is too narrow to support the full ring face
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
- brinelling of washer raceways from impact or mounting force applied through the rolling elements
- 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 4.4 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 500 mm washer track.
- The 1460/6800 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 4.4 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.
- the 750 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is the mechanical ceiling; large 292 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 29272.
- The 1460/6800 kN ratings and 52000 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
What do E, EM and EF mean on 29272?
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 29272 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 4.4 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,200 r/min.
Which dimensions does the 29272 have?
A 29272 measures 360 mm bore × 500 mm outside diameter × 85 mm width (14.173 × 19.685 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1460 kN, static C0 6800 kN, fatigue limit Pu 585 kN, reference speed 750 r/min, limiting speed 1,200 r/min, mass about 52000 g. Minimum axial load factor A 4.4 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.