6328-M bearing: complete specifications & equivalents
The 6328-M is a ISO 15 radial bearing sized 140 x 300 x 62 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 | 300 mm |
| Width B | 62 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 251 kN |
| Basic static load rating C0 | 245 kN |
| Fatigue load limit Pu | 7.1 kN |
| Reference speed (thermal) | 4800 rpm |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 21000 g |
| Manufacturer designation | 6328 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 & 6300-series range
| Bore d | 5.512 in |
|---|---|
| Outer diameter D | 11.811 in |
| Width B | 2.441 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 80 mm |
| Smallest bore in 6300-series | 2 mm |
| Largest outer diameter in 6300-series | 500 mm |
| Width range across 6300-series | 3–95 mm |
| Bore position in 6300-series (smallest first) | 32 of 40 |
| Bore above smallest 6300-series size | 138 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6328-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | NSK bearing NSK 6328ZZ on the same 140×300×62 mm envelope, but catalogue C/C0 differ (251/245 kN vs 278/246 kN) — envelope interchange only after a load check. |
| 6328 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6328 (open arrangement) shares the 140×300×62 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 6328-M model number is decoded
In the 6300-series, the last two digits encode the bore: 6328 carries code 28 = 140 mm (code × 5). The envelope is 140×300×62 mm (5.512×11.811×2.441 in) with a 80.0 mm radial section height, C 251 kN, C0 245 kN and Pu 7.1 kN. The open 6328 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 4300 r/min, catalogue mass 21000 g.
Typical equipment & failure modes
Common applications
- pulp and paper machinery
- marine deck machinery
- crusher auxiliary drives
- large industrial gearboxes
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- rolling-contact fatigue spalling once the catalogue L10 life is exceeded
- brinelling from static overload or hammer blows during mounting
Selection pitfalls — read before you substitute
- Catalogue ratings for 6328-M (C 251 kN, C0 245 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.
- Clearance suffixes follow the seal code in the designation stack (e.g. 6328-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.
- The M suffix on 6328-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 21000 g quoted mass includes the heavier cage.
- Open 6328-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 6328-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Assign interference to the rotating ring: on a conventional shaft-mounted 140 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.
Frequently asked questions
What are the dimensions of 6328-M?
The SKF 6328 M measures 140 mm bore × 300 mm OD × 62 mm width (5.512 × 11.811 × 2.441 in), mass about 21000 g. It is open, with no shields or seals.
How does the bore code in 6328 work?
The final two digits of 6328 are bore code 28, multiplied by 5 to give 140 mm.
How heavy is 6328-M?
Catalogue mass is 21000 g for 6328 M; seal and cage executions of the same envelope differ by a few grams.
What load can 6328-M take?
Catalogue values for 6328 M: dynamic C 251 kN, static C0 245 kN, fatigue limit Pu 7.1 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.