9285-9220 bearing: complete specifications & equivalents
The 9285-9220 is a ISO 355 radial bearing sized 76.2 x 161.925 x 49.212 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 76.2 mm |
| Outer diameter D | 161.925 mm |
| Width B | 49.212 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 318 kN |
| Basic static load rating C0 | 335 kN |
| Fatigue load limit Pu | 38 kN |
| Reference speed (thermal) | 3000 rpm |
| Limiting speed (mechanical) | 4000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4400 g |
| Manufacturer designation | SKF 9285/9220 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB |
| Last verified | 2026-09-28 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB) · extracted 2026-09-28
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB); 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 & 9200-series range
| Bore d | 3 in |
|---|---|
| Outer diameter D | 6.375 in |
| Width B | 1.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 42.9 mm |
| Smallest bore in 9200-series | 76.2 mm |
| Largest outer diameter in 9200-series | 161.925 mm |
| Width range across 9200-series | 49.212–49.212 mm |
| Bore position in 9200-series (smallest first) | 1 of 1 |
| Bore above smallest 9200-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 9285-9220 | Timken | full Dimensions and internal design equivalent — standard interchange. | Same inch-series cone/cup boundary envelope (d/D/T); load ratings and speed limits are brand-specific and may differ. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 9285-9220 model number is decoded
Dimensional interchange map: within the 92800 series at 76.2 mm bore, the 161.925 mm OD and 49.212 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 42.9 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 4400 g mass is the minimum—sealed or snap-ring executions add rotating weight above that catalogue baseline. From a specification standpoint the 9220 cup is the controlling half of 9285 for housing design — it sets the 161.925 mm OD and the outer abutment diameter — while the 9285 cone controls shaft fit at the 76.2 mm bore; the 49.212 mm width is the result of the two together.Ordering number SKF 9285/9220 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 76.2 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 9285 reads as cone reference / cup reference in the 9200-series inch series; the 76.2 mm bore, 161.925 mm OD and 49.212 mm width are the metric equivalents of the original inch boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. ); it is the dimensional series, not a separate part number. With C 318 kN and C0 335 kN, the 9285 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 4,000 r/min. For a 76.2 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 9285 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.
Typical equipment & failure modes
Common applications
- construction machinery drives
- marine deck machinery shafts
- heavy industrial gearboxes and speed reducers
- large process pump and compressor shafts
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- false brinelling on idle paired sets exposed to machine vibration
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- hard-particle indentation of the tapered raceway in unfiltered oil
Selection pitfalls — read before you substitute
- Mount the 76.2 mm bore 9285 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.
- The 9200-series inch series at 76.2 mm bore (161.925×49.212 mm) follows the Timken cone/cup convention; substitutions must match both the cone and cup reference exactly — interchanging with another series or a metric 3xxxx bearing of the same bore changes OD, width and contact angle, so re-run the pair setting and shoulder-diameter checks before swapping.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the 9285 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 9285 mounting error.
- Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 161.925 mm cup race release as noise within the first running hours.
- The 318/335 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of 9285 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 9285/9220 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What shaft and housing fits suit 9285?
For a rotating shaft under normal load, seat the cone on a k5 shaft fit; the cup is usually a loose-to-transition fit in the housing so it can creep slightly and distribute wear. Chamfer and shoulder diameters must clear the bearing rings so the 49.212 mm-wide cup seats square; the mounting setting (end play or preload) is set by the axial position of the cup relative to the cone.
Is 9285 interchangeable with other brands?
Inch-series tapered roller bearings follow a long-standing industry boundary plan, so cones and cups of the same basic number are generally dimensionally interchangeable across manufacturers. However, internal geometry, cage design and load ratings differ by brand, so for paired or precision applications keep both halves of the set from one manufacturer — or re-verify ratings and setting when mixing.
What are the dimensions and catalogue data of 9285?
The SKF 9285/9220 is a single-row tapered roller bearing with 76.2 mm bore, 161.925 mm outer diameter and 49.212 mm width (3 × 6.375 × 1.937 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 318 kN, C0 335 kN, fatigue load limit Pu 38 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 4400 g. It is an open, separable bearing with a pressed-steel cage.
How does the 9285 inch-series designation work?
Inch-series tapered roller bearings use a Timken-style cone/cup convention: the number before the slash identifies the cone (inner ring with roller and cage assembly), the number after the slash identifies the cup (outer ring), and the 9200-series code marks the dimensional series. The metric dimensions 76.2×161.925×49.212 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in 9285 mean?
The cone number (before the slash) identifies the inner ring, rollers and cage; the cup number (after the slash) identifies the outer ring. Both are quoted together because a single-row tapered roller bearing is a matched separable pair — the cone and cup are ground to work together and are not interchangeable with arbitrary other parts. The series prefix (9200-series) groups sizes that share the same boundary-dimension plan.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB on 2026-09-28. Read our editorial & correction policy.