6028-M (brass cage) bearing: complete specifications & equivalents
The 6028-M is a ISO 15 radial bearing sized 140 x 210 x 33 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 140 mm |
| Outer diameter D | 210 mm |
| Width B | 33 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 111 kN |
| Basic static load rating C0 | 108 kN |
| Fatigue load limit Pu | 3.45 kN |
| Reference speed (thermal) | 6700 rpm |
| Limiting speed (mechanical) | 5300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4000 g |
| Manufacturer designation | 6028 M |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
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 & 6000-series range
| Bore d | 5.512 in |
|---|---|
| Outer diameter D | 8.268 in |
| Width B | 1.299 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 35 mm |
| Smallest bore in 6000-series | 4 mm |
| Largest outer diameter in 6000-series | 1150 mm |
| Width range across 6000-series | 4–155 mm |
| Bore position in 6000-series (smallest first) | 32 of 61 |
| Bore above smallest 6000-series size | 136 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6028-FAG | FAG | full Dimensions and internal design equivalent — standard interchange. | FAG counterpart FAG 6028 on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6028-2RS-FAG | FAG | full Dimensions and internal design equivalent — standard interchange. | FAG counterpart FAG 6028-2RSR on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6028-ZZ-FAG | FAG | full Dimensions and internal design equivalent — standard interchange. | FAG counterpart FAG 6028-2Z on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6028-2RS-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6028DDU on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6028-ZZ-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6028ZZ on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6028-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6028 on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6028-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart 6028 on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6028-2RS-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart 6028LLU on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6028-ZZ-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart 6028ZZ on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6028 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6028 (open arrangement) shares the 140×210×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6028-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6028-2RS1 (two contact elastomer seals) shares the 140×210×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6028-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6028-2Z (two non-contact shields) shares the 140×210×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
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 6028-M model number is decoded
In the 6000-series, the last two digits encode the bore: 6028 carries code 28 = 140 mm (code × 5). The envelope is 140×210×33 mm (5.512×8.268×1.299 in) with a 35.0 mm radial section height, C 111 kN, C0 108 kN and Pu 3.45 kN. The open 6028 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5300 r/min, catalogue mass 4000 g.
Typical equipment & failure modes
Common applications
- large industrial gearboxes
- heavy conveyor drives
- hoists and winches
- industrial fans and blowers
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- raceway smearing under marginal lubrication at start-up
- electrical pitting in VFD-driven motors without shaft grounding
Selection pitfalls — read before you substitute
- Do not preload 6028-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Catalogue ratings for 6028-M (C 111 kN, C0 108 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.
- The M suffix on 6028-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 4000 g quoted mass includes the heavier cage.
- Open 6028-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.
- Plan a relubrication interval for 6028-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Fillet radii must clear the 6028-M chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.
- Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.
Frequently asked questions
What are the dimensions of 6028-M?
The SKF 6028 M measures 140 mm bore × 210 mm OD × 33 mm width (5.512 × 8.268 × 1.299 in), mass about 4000 g. It is open, with no shields or seals.
How does the bore code in 6028 work?
The final two digits of 6028 are bore code 28, multiplied by 5 to give 140 mm.
What internal clearance does 6028-M have?
Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life.
How long can a greased 6028-M be stored?
Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly.
What load can 6028-M take?
Catalogue values for 6028 M: dynamic C 111 kN, static C0 108 kN, fatigue limit Pu 3.45 kN. Use C in life calculation and C0 for static checks at 140 mm bore.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.