310 bearing: complete specifications & equivalents
The 310 is a ISO 15 radial bearing sized 50 x 110 x 27 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 50 mm |
| Outer diameter D | 110 mm |
| Width B | 27 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 64.4 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 | 1150 g |
| Manufacturer designation | 310 |
| 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 | 1.969 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 1.063 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 30 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) | 6 of 14 |
| Bore above smallest 300-series size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6310-RSR | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | NSK bearing NSK 6310VV on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68/38.5 kN) — envelope interchange only after a load check. |
| 6310-M | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 50×110×27 mm envelope as SKF 6310 M, but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match only after a load check. |
| 310-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 50×110×27 mm envelope and equivalent catalogue ratings; 310-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| 6310 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6310 shares the 50×110×27 mm envelope but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match, not a load-rating equivalent. |
| 6310-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6310-2Z shares the 50×110×27 mm envelope but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match, not a load-rating equivalent. |
| 6310-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6310-2RSH shares the 50×110×27 mm envelope but catalogue C/C0 differ (64.4/52 kN vs 65/38 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 310 model number is decoded
310 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 310 carries code 10 = 50 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 50×110×27 mm envelope its C 64.4 kN and C0 52 kN ratings (Pu 2.2 kN). The open 310 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 7000 r/min, mass 1150 g. These bearings are built for high purely-radial loads at moderate speeds.
Typical equipment & failure modes
Common applications
- slew drives
- material-handling winches
- slow heavy gearboxes
- farm machinery and harvesters
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
- raceway smearing under marginal lubrication at start-up
- electrical pitting in VFD-driven motors without shaft grounding
Selection pitfalls — read before you substitute
- Limiting speed is just 7000 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 50×110 mm envelope, which is why 310 reaches C 64.4 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.
- The slots sit at one angular position: on 310, never pass the full radial load across the slot zone during mounting or the ring lip can crack.
- 310 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 310 exactly when ordering replacements.
- Limiting speed is just 7000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.
- Assign interference to the rotating ring: on a conventional shaft-mounted 50 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 310?
Filling-slot bearing 310 measures 50×110×27 mm (1.969×4.331×1.063 in), about 1150 g.
What does the designation 310 mean?
It is the legacy 200/300 filling-slot numbering: series 300 and bore code 10 = 50 mm. Filling-slot bearings predate the 6xxx deep-groove spelling.
Why use an old 300-series bearing instead of a 62xx?
For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better.
What fails on 310?
Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 7000 r/min limiting speed are the typical failure modes.
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.