89440-M bearing: complete specifications & equivalents
The 89440-M is a ISO 104 radial bearing sized 200 x 400 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 | 200 mm |
| Outer diameter D | 400 mm |
| Width B | 122 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 2160 kN |
| Basic static load rating C0 | 10000 kN |
| Fatigue load limit Pu | 800 kN |
| Reference speed (thermal) | 360 rpm |
| Limiting speed (mechanical) | 700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 75000 g |
| Manufacturer designation | 89440 M |
| Standard | ISO 104 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical 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. 11.1 cylindrical 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 & 89400-series range
| Bore d | 7.874 in |
|---|---|
| Outer diameter D | 15.748 in |
| Width B | 4.803 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 100 mm |
| Smallest bore in 89400-series | 80 mm |
| Largest outer diameter in 89400-series | 420 mm |
| Width range across 89400-series | 54–122 mm |
| Bore position in 89400-series (smallest first) | 6 of 7 |
| Bore above smallest 89400-series size | 120 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 89440-M model number is decoded
The extra-heavy 894 series bearing 89440 M carries pure axial load at low to moderate speed: 2160 kN dynamic and 10000 kN static across a 200×400 mm washer pair, 122 mm overall height. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 89440 M sits in the extra-heavy 894 series. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 2160 kN rating assumes oil or grease reaching the full washer face. Static safety matters for shock duty: compare peak axial force against C0 10000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.
Typical equipment & failure modes
Common applications
- rolling-mill screwdown mechanisms and press adjusters
- slewing and turntable pivots with predominantly axial force
- crane hook crossheads carrying pure hook thrust while the hook swivels
- screw jack and lifting screw thrust positions under slow, steady load
Known failure patterns
- roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)
- housing-washer rotation scored into an unmachined or loose seating face
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
- 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 200 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 122 mm.
- The 2160/10000 kN ratings assume flat, full-support washer seats; a housing face narrower than the 400 mm washer OD invalidates the rating through edge stress.
- Factor A 8 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most "mysterious" early thrust failures are unloaded running.
- Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.
- Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89440 M need different minimum load and lubrication despite the shared 200×400 mm outline.
- The 2160/10000 kN ratings and 75000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only.
Frequently asked questions
Can a thrust ball bearing replace the 89440 M?
They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting.
What ruins a 89440 M in service?
Unloaded running below factor A 8 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 700 r/min limiting.
Which dimensions does the 89440 M have?
A 89440 M measures 200 mm bore × 400 mm outside diameter × 122 mm width (7.874 × 15.748 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2160 kN, static C0 10000 kN, fatigue limit Pu 800 kN, reference speed 360 r/min, limiting speed 700 r/min, mass about 75000 g. Raceway diameters Ea 224 mm / Eb 391 mm and minimum load factor A 8 guide the seat design.
What is the difference between 811 and 812 series?
811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 89440 M belongs to the extra-heavy 894 series, 200×400×122 mm.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings on 2026-09-27. Read our editorial & correction policy.