313 bearing: complete specifications & equivalents
The 313 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 | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 102 kN |
| Basic static load rating C0 | 90 kN |
| Fatigue load limit Pu | 3.75 kN |
| Reference speed (thermal) | 9000 rpm |
| Limiting speed (mechanical) | 5300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2300 g |
| Manufacturer designation | 313 |
| 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 & 300-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 300-series | 25 mm |
| Largest outer diameter in 300-series | 190 mm |
| Width range across 300-series | 17–43 mm |
| Bore position in 300-series (smallest first) | 9 of 14 |
| Bore above smallest 300-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6313-RSR | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | NSK bearing NSK 6313VV on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 102/60 kN) — envelope interchange only after a load check. |
| 6313-M | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 65×140×33 mm envelope as SKF 6313 M, but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match only after a load check. |
| 313-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 65×140×33 mm envelope and equivalent catalogue ratings; 313-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| 6313 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6313 shares the 65×140×33 mm envelope but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match, not a load-rating equivalent. |
| 6313-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6313-2Z shares the 65×140×33 mm envelope but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match, not a load-rating equivalent. |
| 6313-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6313-2RS1 shares the 65×140×33 mm envelope but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match, not a load-rating equivalent. |
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 313 model number is decoded
313 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 313 carries code 13 = 65 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 65×140×33 mm envelope its C 102 kN and C0 90 kN ratings (Pu 3.75 kN). The open 313 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 5300 r/min, mass 2300 g. These bearings are built for high purely-radial loads at moderate speeds.
Typical equipment & failure modes
Common applications
- hoists and winch gear trains
- eccentric and vibratory conveyors
- legacy machinery repairs
- slew drives
Known failure patterns
- spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading
- dirt entering through the open slot area when external sealing is neglected
- cage damage from running beyond the limiting speed
- raceway smearing under marginal lubrication at start-up
Selection pitfalls — read before you substitute
- 313 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 313 exactly when ordering replacements.
- Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 102/90 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.
- Shields on 313 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.
- Limiting speed is just 5300 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.
- Filling slots let more balls be packed into the 65×140 mm envelope, which is why 313 reaches C 102 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.
- Mount by heating the inner ring (max 120 °C) — driving 313 home through the outer ring or balls brinells the raceways.
Frequently asked questions
What are the dimensions of 313?
Filling-slot bearing 313 measures 65×140×33 mm (2.559×5.512×1.299 in), about 2300 g.
What does the designation 313 mean?
It is the legacy 200/300 filling-slot numbering: series 300 and bore code 13 = 65 mm. Filling-slot bearings predate the 6xxx deep-groove spelling.
Is 313 available sealed?
Shielded executions (-2Z, listed here as 313-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family.
What is a filling-slot bearing?
The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 102 kN for 313). The slots also make the rings separable.
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.