6330-M bearing: complete specifications & equivalents
The 6330-M is a ISO 15 radial bearing sized 150 x 320 x 65 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 150 mm |
| Outer diameter D | 320 mm |
| Width B | 65 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 276 kN |
| Basic static load rating C0 | 285 kN |
| Fatigue load limit Pu | 7.8 kN |
| Reference speed (thermal) | 4300 rpm |
| Limiting speed (mechanical) | 4000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 25500 g |
| Manufacturer designation | 6330 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 | 5.906 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 2.559 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 85 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) | 33 of 40 |
| Bore above smallest 6300-series size | 148 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6330-ZZ | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6330ZZ on the same 150×320×65 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6330 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6330 (open arrangement) shares the 150×320×65 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 6330-M model number is decoded
In the 6300-series, the last two digits encode the bore: 6330 carries code 30 = 150 mm (code × 5). The envelope is 150×320×65 mm (5.906×12.598×2.559 in) with a 85.0 mm radial section height, C 276 kN, C0 285 kN and Pu 7.8 kN. The open 6330 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 4000 r/min, catalogue mass 25500 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 6330-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Fillet radii must clear the 6330-M chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- The M suffix on 6330-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 25500 g quoted mass includes the heavier cage.
- Open 6330-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 6330-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Catalogue ratings for 6330-M (C 276 kN, C0 285 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.
Frequently asked questions
What are the dimensions of 6330-M?
The SKF 6330 M measures 150 mm bore × 320 mm OD × 65 mm width (5.906 × 12.598 × 2.559 in), mass about 25500 g. It is open, with no shields or seals.
How does the bore code in 6330 work?
The final two digits of 6330 are bore code 30, multiplied by 5 to give 150 mm.
Which fits should I use for 6330-M?
With a rotating inner ring use roughly m6 on the shaft and H7 in the 320 mm housing; reverse the interference if the outer ring rotates.
How heavy is 6330-M?
Catalogue mass is 25500 g for 6330 M; seal and cage executions of the same envelope differ by a few grams.
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.