29268 bearing: complete specifications & equivalents
The 29268 is a ISO 104 radial bearing sized 340 x 460 x 73 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 | 460 mm |
| Width B | 73 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1130 kN |
| Basic static load rating C0 | 5400 kN |
| Fatigue load limit Pu | 480 kN |
| Reference speed (thermal) | 850 rpm |
| Limiting speed (mechanical) | 1300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 33500 g |
| Manufacturer designation | 29268 |
| 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 | 13.386 in |
|---|---|
| Outer diameter D | 18.11 in |
| Width B | 2.874 in |
| ISO bore code | 68 |
| Radial section height (D−d)/2 | 60 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) | 10 of 23 |
| Bore above smallest 29200-series size | 190 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 29268 model number is decoded
29268 is the classic hook-block and screw-end thrust bearing: 340 mm shaft washer bore, 460 mm OD, minimum axial load factor A 2.8, and free rotation under load thanks to the spherical geometry. In 29268, the 292 series fixes the 460 mm OD and 73 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 68 selects the 340 mm seat. 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 5400 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 2.8) 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
- 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
- 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
- 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 2.8 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 460 mm washer track.
- 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 1130/5400 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.
- 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 29268.
- Minimum load factor A 2.8 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.
- The 1130/5400 kN ratings and 33500 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
How is a 29268 mounted?
Tight shaft washer on the 340 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 2.8 preload verified at commissioning.
What are the dimensions and ratings of the 29268?
A 29268 measures 340 mm bore × 460 mm outside diameter × 73 mm width (13.386 × 18.11 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1130 kN, static C0 5400 kN, fatigue limit Pu 480 kN, reference speed 850 r/min, limiting speed 1,300 r/min, mass about 33500 g. Minimum axial load factor A 2.8 must be maintained in service.
How is the 29268 designation read?
292 is the dimension series (high-speed 292 series) and 68 the 340 mm bore (code 68 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment.
Why is the minimum axial load (A 2.8) so important?
Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 2.8 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs.
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.