6313-M bearing: complete specifications & equivalents
The 6313-M is a ISO 15 radial bearing sized 65 x 140 x 33 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 65 mm |
| Outer diameter D | 140 mm |
| Width B | 33 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 97.5 kN |
| Basic static load rating C0 | 60 kN |
| Fatigue load limit Pu | 2.5 kN |
| Reference speed (thermal) | 10000 rpm |
| Limiting speed (mechanical) | 6700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2550 g |
| Manufacturer designation | 6313 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 | 2.559 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 1.299 in |
| ISO bore code | 13 |
| Radial section height (D−d)/2 | 37.5 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) | 20 of 40 |
| Bore above smallest 6300-series size | 63 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6313-RSR | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6313VV on the same 65×140×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 313 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 65×140×33 mm envelope as SKF 313, but catalogue C/C0 differ (97.5/60 kN vs 102/90 kN) — envelope match only after a load check. |
| 313-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 65×140×33 mm envelope as SKF 313-2Z, but catalogue C/C0 differ (97.5/60 kN vs 102/90 kN) — envelope match only after a load check. |
| 6313 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6313 (open arrangement) shares the 65×140×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6313-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6313-2Z (two non-contact shields) shares the 65×140×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6313-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6313-2RS1 (two contact elastomer seals) shares the 65×140×33 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 6313-M model number is decoded
In the 6300-series, the last two digits encode the bore: 6313 carries code 13 = 65 mm (code × 5). The envelope is 65×140×33 mm (2.559×5.512×1.299 in) with a 37.5 mm radial section height, C 97.5 kN, C0 60 kN and Pu 2.5 kN. The open 6313 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 6700 r/min, catalogue mass 2550 g.
Typical equipment & failure modes
Common applications
- material-handling equipment
- industrial fans
- compressor drives
- machine tool auxiliaries
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- electrical pitting in VFD-driven motors without shaft grounding
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- Mount by heating the inner ring (max 120 °C) — driving 6313-M home through the outer ring or balls brinells the raceways.
- The fatigue load limit is 2.5 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- The M suffix on 6313-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 2550 g quoted mass includes the heavier cage.
- Open 6313-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 6313-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Do not preload 6313-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
Frequently asked questions
What are the dimensions of 6313-M?
The SKF 6313 M measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2550 g. It is open, with no shields or seals.
How does the bore code in 6313 work?
The final two digits of 6313 are bore code 13, multiplied by 5 to give 65 mm.
What load can 6313-M take?
Catalogue values for 6313 M: dynamic C 97.5 kN, static C0 60 kN, fatigue limit Pu 2.5 kN. Use C in life calculation and C0 for static checks at 65 mm bore.
What is the speed rating of 6313-M?
SKF lists a 10000 r/min thermal reference speed and a 6700 r/min mechanical limiting speed for 6313 M; real limits also depend on lubrication and fits.
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.