6334-M bearing: complete specifications & equivalents
The 6334-M is a ISO 15 radial bearing sized 170 x 360 x 72 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 170 mm |
| Outer diameter D | 360 mm |
| Width B | 72 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 312 kN |
| Basic static load rating C0 | 340 kN |
| Fatigue load limit Pu | 8.8 kN |
| Reference speed (thermal) | 3800 rpm |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 35000 g |
| Manufacturer designation | 6334 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 | 6.693 in |
|---|---|
| Outer diameter D | 14.173 in |
| Width B | 2.835 in |
| ISO bore code | 34 |
| Radial section height (D−d)/2 | 95 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) | 35 of 40 |
| Bore above smallest 6300-series size | 168 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6334 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6334 (open arrangement) shares the 170×360×72 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 6334-M model number is decoded
In the 6300-series, the last two digits encode the bore: 6334 carries code 34 = 170 mm (code × 5). The envelope is 170×360×72 mm (6.693×14.173×2.835 in) with a 95.0 mm radial section height, C 312 kN, C0 340 kN and Pu 8.8 kN. The open 6334 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 3400 r/min, catalogue mass 35000 g.
Typical equipment & failure modes
Common applications
- mill and kiln auxiliaries
- pulp and paper machinery
- marine deck machinery
- crusher auxiliary drives
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- brinelling from static overload or hammer blows during mounting
- false brinelling from vibration while the shaft stands idle
Selection pitfalls — read before you substitute
- Do not preload 6334-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Clearance suffixes follow the seal code in the designation stack (e.g. 6334-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.
- The M suffix on 6334-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 35000 g quoted mass includes the heavier cage.
- Open 6334-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 6334-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Deep-groove geometry tolerates only minutes of misalignment; if the 360 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6334-M.
Frequently asked questions
What are the dimensions of 6334-M?
The SKF 6334 M measures 170 mm bore × 360 mm OD × 72 mm width (6.693 × 14.173 × 2.835 in), mass about 35000 g. It is open, with no shields or seals.
How does the bore code in 6334 work?
The final two digits of 6334 are bore code 34, multiplied by 5 to give 170 mm.
What is the speed rating of 6334-M?
SKF lists a 3800 r/min thermal reference speed and a 3400 r/min mechanical limiting speed for 6334 M; real limits also depend on lubrication and fits.
What is the difference between 6334-M and a same-bore 62-series bearing?
Section height differs: 6334-M has a 95 mm radial section and C 312 kN; always match d, D and B — same bore alone never makes two bearings interchangeable.
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.