89438-M bearing: complete specifications & equivalents
The 89438-M is a ISO 104 radial bearing sized 190 x 380 x 115 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 190 mm |
| Outer diameter D | 380 mm |
| Width B | 115 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 1960 kN |
| Basic static load rating C0 | 9000 kN |
| Fatigue load limit Pu | 720 kN |
| Reference speed (thermal) | 380 rpm |
| Limiting speed (mechanical) | 750 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 65500 g |
| Manufacturer designation | 89438 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 | 7.48 in |
|---|---|
| Outer diameter D | 14.961 in |
| Width B | 4.528 in |
| ISO bore code | 38 |
| Radial section height (D−d)/2 | 95 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) | 5 of 7 |
| Bore above smallest 89400-series size | 110 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 89438-M model number is decoded
SKF supplies 89438 M as a separable thrust bearing: the 190 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 380 mm housing washer (GS) can be ordered and mounted individually. The designation 89438 M states 894 series, 190 mm bore, machined brass M cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 6.5. The 65500 g mass and 115 mm axial height sit between 190 and 380 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 6.5) is present without clamping the rollers.
Typical equipment & failure modes
Common applications
- extruder and injection press screw thrust blocks at low speed
- 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
Known failure patterns
- smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established
- washer back-face fretting where the seat is too narrow to support the full ring face
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
- 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
- At 190 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 115 mm.
- Factor A 6.5 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.
- the 380 r/min reference speed is the thermal criterion under load, the 750 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.
- The 1960/9000 kN ratings assume flat, full-support washer seats; a housing face narrower than the 380 mm washer OD invalidates the rating through edge stress.
- The 1960/9000 kN ratings and 65500 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
What are the dimensions and ratings of the 89438 M?
A 89438 M measures 190 mm bore × 380 mm outside diameter × 115 mm width (7.48 × 14.961 × 4.528 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1960 kN, static C0 9000 kN, fatigue limit Pu 720 kN, reference speed 380 r/min, limiting speed 750 r/min, mass about 65500 g. Raceway diameters Ea 212 mm / Eb 371 mm and minimum load factor A 6.5 guide the seat design.
How is the 89438 M designation read?
The first three digits 894 give the dimension series (extra-heavy 894 series); 38 encodes the 190 mm bore (code 38 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately.
Why does 89438 M need a minimum axial load?
Below factor A 6.5 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts.
Can the 89438 M take reversing thrust?
No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load.
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.