6348-M bearing: complete specifications & equivalents
The 6348-M is a ISO 15 radial bearing sized 240 x 500 x 95 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 240 mm |
| Outer diameter D | 500 mm |
| Width B | 95 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 442 kN |
| Basic static load rating C0 | 585 kN |
| Fatigue load limit Pu | 12.9 kN |
| Reference speed (thermal) | 2600 rpm |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 97000 g |
| Manufacturer designation | 6348 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 | 9.449 in |
|---|---|
| Outer diameter D | 19.685 in |
| Width B | 3.74 in |
| ISO bore code | 48 |
| Radial section height (D−d)/2 | 130 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) | 40 of 40 |
| Bore above smallest 6300-series size | 238 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6348 | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | NSK bearing NSK 6348 on the same 240×500×95 mm envelope, but catalogue C/C0 differ (442/585 kN vs 515/625 kN) — envelope interchange only after a load check. |
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 6348-M model number is decoded
In the 6300-series, the last two digits encode the bore: 6348 carries code 48 = 240 mm (code × 5). The envelope is 240×500×95 mm (9.449×19.685×3.74 in) with a 130.0 mm radial section height, C 442 kN, C0 585 kN and Pu 12.9 kN. The open 6348 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 2400 r/min, catalogue mass 97000 g.
Typical equipment & failure modes
Common applications
- crusher auxiliary drives
- large industrial gearboxes
- heavy conveyor drives
- hoists and winches
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- false brinelling from vibration while the shaft stands idle
- fretting corrosion on a creeping shaft or housing seat
Selection pitfalls — read before you substitute
- Mount by heating the inner ring (max 120 °C) — driving 6348-M home through the outer ring or balls brinells the raceways.
- Do not preload 6348-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- The M suffix on 6348-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 97000 g quoted mass includes the heavier cage.
- Open 6348-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 6348-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 240 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 6348-M?
The SKF 6348 M measures 240 mm bore × 500 mm OD × 95 mm width (9.449 × 19.685 × 3.74 in), mass about 97000 g. It is open, with no shields or seals.
How does the bore code in 6348 work?
The final two digits of 6348 are bore code 48, multiplied by 5 to give 240 mm.
What is the difference between 6348-M and a same-bore 62-series bearing?
Section height differs: 6348-M has a 130 mm radial section and C 442 kN; always match d, D and B — same bore alone never makes two bearings interchangeable.
Which fits should I use for 6348-M?
With a rotating inner ring use roughly m6 on the shaft and H7 in the 500 mm housing; reverse the interference if the outer ring rotates.
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.