293-800-EM bearing: complete specifications & equivalents
The 293-800-EM is a ISO 104 radial bearing sized 800 x 1180 x 230 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 800 mm |
| Outer diameter D | 1180 mm |
| Width B | 230 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 11300 kN |
| Basic static load rating C0 | 55000 kN |
| Fatigue load limit Pu | 3900 kN |
| Reference speed (thermal) | 240 rpm |
| Limiting speed (mechanical) | 450 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 810000 g |
| Manufacturer designation | 293/800 EM |
| 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 | 31.496 in |
|---|---|
| Outer diameter D | 46.457 in |
| Width B | 9.055 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 190 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) | 31 of 31 |
| Bore above smallest 29300-series size | 715 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 293-800-EM model number is decoded
293/800 EM is the classic hook-block and screw-end thrust bearing: 800 mm shaft washer bore, 1180 mm OD, minimum axial load factor A 290, and free rotation under load thanks to the spherical geometry. The designation 293/800 EM separates into 293 (series), 800 mm (slash-size) (800 mm bore — bore 800 mm is written directly after the slash) and EM; washers are separable for individual mounting. A minimum axial load of factor A 290 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 810000 g mass and 230 mm axial height sit between 800 and 1180 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 290) 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
- 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
- At 800 mm bore and 810 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.
- Minimum load factor A 290 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 240 r/min reference speed is the thermal criterion under load, the 450 r/min limiting speed is the mechanical ceiling; large 293 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 293/800 EM.
- The 11300/55000 kN ratings and 810000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); 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
Can the 293/800 EM also carry radial load?
Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust.
How is a 293/800 EM mounted?
Tight shaft washer on the 800 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 290 preload verified at commissioning.
What are the dimensions and ratings of the 293/800 EM?
A 293/800 EM measures 800 mm bore × 1180 mm outside diameter × 230 mm width (31.496 × 46.457 × 9.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11300 kN, static C0 55000 kN, fatigue limit Pu 3900 kN, reference speed 240 r/min, limiting speed 450 r/min, mass about 810000 g. Minimum axial load factor A 290 must be maintained in service.
How is the 293/800 EM designation read?
293 is the dimension series (medium 293 series) and 800 mm (slash-size) the 800 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment.
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.