29276 bearing: complete specifications & equivalents
The 29276 is a ISO 104 radial bearing sized 380 x 520 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 | 380 mm |
| Outer diameter D | 520 mm |
| Width B | 85 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1580 kN |
| Basic static load rating C0 | 7650 kN |
| Fatigue load limit Pu | 655 kN |
| Reference speed (thermal) | 700 rpm |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 53000 g |
| Manufacturer designation | 29276 |
| 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 | 14.961 in |
|---|---|
| Outer diameter D | 20.472 in |
| Width B | 3.346 in |
| ISO bore code | 76 |
| 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) | 12 of 23 |
| Bore above smallest 29200-series size | 230 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29276 model number is decoded
Where a cylindrical roller thrust bearing would edge-load under deflection, 29276 aligns itself: 380×520×85 mm envelope, 7650 kN static rating, one load direction. Reading the code: 292 gives the dimension series (high-speed 292 series) and 76 the 380 mm shaft washer bore (code 76 × 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 7650 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
- 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
- abrasive paste forming as dust bypasses the housing seals into the open washer set
- brinelling of washer raceways from impact or mounting force applied through the rolling elements
- cage wear from rollers being dragged through unloaded zones under fluctuating thrust
Selection pitfalls — read before you substitute
- Above 300 mm bore the minimum load is large (A 5.6 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 520 mm washer track.
- 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 700 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.
- Minimum load factor A 5.6 dominates commissioning: start the oil flow and preload before rotation, especially on 292 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 29276.
- The 1580/7650 kN ratings and 53000 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
Where is the 29276 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 5.6 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,100 r/min.
Which dimensions does the 29276 have?
A 29276 measures 380 mm bore × 520 mm outside diameter × 85 mm width (14.961 × 20.472 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1580 kN, static C0 7650 kN, fatigue limit Pu 655 kN, reference speed 700 r/min, limiting speed 1,100 r/min, mass about 53000 g. Minimum axial load factor A 5.6 must be maintained in service.
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. 29276 is the high-speed 292 series, 380×520×85 mm.
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.