6312-M bearing: complete specifications & equivalents
The 6312-M is a ISO 15 radial bearing sized 60 x 130 x 31 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 60 mm |
| Outer diameter D | 130 mm |
| Width B | 31 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 85.2 kN |
| Basic static load rating C0 | 52 kN |
| Fatigue load limit Pu | 2.2 kN |
| Reference speed (thermal) | 11000 rpm |
| Limiting speed (mechanical) | 7000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2100 g |
| Manufacturer designation | 6312 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 | 2.362 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 1.22 in |
| ISO bore code | 12 |
| Radial section height (D−d)/2 | 35 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) | 19 of 40 |
| Bore above smallest 6300-series size | 58 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6312-RSR | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6312VV on the same 60×130×31 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 312 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 60×130×31 mm envelope as SKF 312, but catalogue C/C0 differ (85.2/52 kN vs 91.3/78 kN) — envelope match only after a load check. |
| 312-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 60×130×31 mm envelope as SKF 312-2Z, but catalogue C/C0 differ (85.2/52 kN vs 91.3/78 kN) — envelope match only after a load check. |
| 6312 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6312 (open arrangement) shares the 60×130×31 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6312-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6312-2Z (two non-contact shields) shares the 60×130×31 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6312-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6312-2RSH (two contact elastomer seals) shares the 60×130×31 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 6312-M model number is decoded
In the 6300-series, the last two digits encode the bore: 6312 carries code 12 = 60 mm (code × 5). The envelope is 60×130×31 mm (2.362×5.118×1.22 in) with a 35.0 mm radial section height, C 85.2 kN, C0 52 kN and Pu 2.2 kN. The open 6312 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 7000 r/min, catalogue mass 2100 g.
Typical equipment & failure modes
Common applications
- industrial fans
- compressor drives
- machine tool auxiliaries
- agricultural gearboxes
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
- At 60 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.
- Clearance suffixes follow the seal code in the designation stack (e.g. 6312-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.
- The M suffix on 6312-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 2100 g quoted mass includes the heavier cage.
- Open 6312-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 6312-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- The fatigue load limit is 2.2 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
Frequently asked questions
What are the dimensions of 6312-M?
The SKF 6312 M measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 2100 g. It is open, with no shields or seals.
How does the bore code in 6312 work?
The final two digits of 6312 are bore code 12, multiplied by 5 to give 60 mm.
How heavy is 6312-M?
Catalogue mass is 2100 g for 6312 M; seal and cage executions of the same envelope differ by a few grams.
What load can 6312-M take?
Catalogue values for 6312 M: dynamic C 85.2 kN, static C0 52 kN, fatigue limit Pu 2.2 kN. Use C in life calculation and C0 for static checks at 60 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.