29368 bearing: complete specifications & equivalents
The 29368 is a ISO 104 radial bearing sized 340 x 540 x 122 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 340 mm |
| Outer diameter D | 540 mm |
| Width B | 122 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2710 kN |
| Basic static load rating C0 | 11000 kN |
| Fatigue load limit Pu | 950 kN |
| Reference speed (thermal) | 600 rpm |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 105000 g |
| Manufacturer designation | 29368 |
| 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 & 29300-series range
| Bore d | 13.386 in |
|---|---|
| Outer diameter D | 21.26 in |
| Width B | 4.803 in |
| ISO bore code | 68 |
| Radial section height (D−d)/2 | 100 mm |
| Smallest bore in 29300-series | 85 mm |
| Largest outer diameter in 29300-series | 1180 mm |
| Width range across 29300-series | 39–230 mm |
| Bore position in 29300-series (smallest first) | 20 of 31 |
| Bore above smallest 29300-series size | 255 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29368 model number is decoded
SKF supplies 29368 for very heavy one-direction axial load: 2710 kN dynamic and 11000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. 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; 29368 is the steel cage of the earlier standard design. A minimum axial load of factor A 11 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 105000 g mass and 122 mm axial height sit between 340 and 540 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 11) 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
- 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
- crane hook assemblies where the hook block turns under full load
Known failure patterns
- roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)
- shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder
- grease churning and overheating when a high-speed thrust position is over-packed
- false brinelling and rust-red witness marks on standby machines under external vibration
- 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 11 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 540 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 29368.
- 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.
- Minimum load factor A 11 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.
- 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 2710/11000 kN ratings and 105000 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 destroys a spherical roller thrust bearing?
Unloaded rotation below A 11 (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 29368 have?
A 29368 measures 340 mm bore × 540 mm outside diameter × 122 mm width (13.386 × 21.26 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2710 kN, static C0 11000 kN, fatigue limit Pu 950 kN, reference speed 600 r/min, limiting speed 1,100 r/min, mass about 105000 g. Minimum axial load factor A 11 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. 29368 is the medium 293 series, 340×540×122 mm.
What do E, EM and EF mean on 29368?
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.
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.