6328 bearing: complete specifications & equivalents
The 6328 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 |
|---|---|
| Bore diameter d | 140 mm |
| Outer diameter D | 300 mm |
| Width B | 62 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 | 251 kN |
| Basic static load rating C0 | 245 kN |
| Fatigue load limit Pu | 7.1 kN |
| Reference speed (thermal) | 4800 rpm |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 18500 g |
| Manufacturer designation | SKF 6328 |
| 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 & 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 | 10 mm |
| Largest outer diameter in 6300-series | 400 mm |
| Width range across 6300-series | 11–78 mm |
| Bore position in 6300-series (smallest first) | 26 of 30 |
| Bore above smallest 6300-series size | 130 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6328 | 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 6328 model number is decoded
In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6328 carries bore code 28 = 140 mm. Outside diameter 300 mm and width 62 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
- industrial fans and blowers
- hoists and winches
- heavy conveyors
- pulp and paper machinery
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- raceway smearing under marginal lubrication at start-up
- edge loading from shaft deflection or housing misalignment
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 63xx medium series gains rating at 140 mm bore through a 300 mm OD and 62 mm width; the heavier rolling elements also trade away some speed versus a 6228.
- The open 6328 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×300×62 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6328 units.
- Shaft and housing fillets must clear the bearing chamfer so the 62 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.
- The open 6328 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6328-2Z (shields) and 6328-2RSH (contact seals), not suffix-free 6328.
- The 251/245 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 6328 bearing?
A 6328 deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
How does the 6328 bore code work?
The last two digits of 6328 are bore code 28, giving 28 × 5 = 140 mm bore. The 300 mm outside diameter and 62 mm width follow the ISO 15 diameter series, not the bore code alone.
What does no suffix on 6328 mean?
A bare 6328 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 6300 compare with other series at the same 140 mm bore?
The '3' is the medium diameter series: 300×62 mm, 80.0 mm radial section at 140 mm bore, carrying more load than a 6228 but needing a larger housing bore and giving up some speed.
What is the SKF designation and catalogue data for 6328?
In the SKF Rolling Bearings catalogue this size is listed as 6328 — the open (unsealed) execution, 140×300×62 mm per ISO 15. Quoted values: C 251 kN, C0 245 kN, Pu 7.1 kN, limiting speed 3000 r/min, mass 18500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6328.
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.