6228 bearing: complete specifications & equivalents
The 6228 is a ISO 15 radial bearing sized 140 x 250 x 42 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 140 mm |
| Outer diameter D | 250 mm |
| Width B | 42 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 165 kN |
| Basic static load rating C0 | 150 kN |
| Fatigue load limit Pu | 4.55 kN |
| Reference speed (thermal) | 5300 rpm |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 7750 g |
| Manufacturer designation | SKF 6228 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-24 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-24
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); 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 & 6200-series range
| Bore d | 5.512 in |
|---|---|
| Outer diameter D | 9.843 in |
| Width B | 1.654 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 55 mm |
| Smallest bore in 6200-series | 10 mm |
| Largest outer diameter in 6200-series | 400 mm |
| Width range across 6200-series | 9–65 mm |
| Bore position in 6200-series (smallest first) | 26 of 33 |
| Bore above smallest 6200-series size | 130 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6228 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 6228 model number is decoded
In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.
Typical equipment & failure modes
Common applications
- medium and heavy industrial drives
- large gearboxes
- industrial fans and blowers
- hoists and winches
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- electrical pitting in VFD-driven motors without grounding protection
- raceway smearing under marginal lubrication at start-up
Selection pitfalls — read before you substitute
- Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.
- The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.
- The open 6228 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×250×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6228 units.
- A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.
- The open 6228 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6228-2Z (shields) and 6228-2RSH (contact seals), not suffix-free 6228.
- The 165/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives.
Frequently asked questions
What are the dimensions of a 6228 bearing?
A 6228 deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
How does the 6228 bore code work?
The last two digits of 6228 are bore code 28, giving 28 × 5 = 140 mm bore. The 250 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone.
What does no suffix on 6228 mean?
A bare 6228 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication.
How does the 6200 compare with other series at the same 140 mm bore?
The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated.
What is the SKF designation and catalogue data for 6228?
In the SKF Rolling Bearings catalogue this size is listed as 6228 — the open (unsealed) execution, 140×250×42 mm per ISO 15. Quoted values: C 165 kN, C0 150 kN, Pu 4.55 kN, limiting speed 3400 r/min, mass 7750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6228.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-24. Read our editorial & correction policy.