3310-A-2RS1 bearing: complete specifications & equivalents
The 3310-A-2RS1 is a ISO 15 radial bearing sized 50 x 110 x 44.4 mm (bore x OD x width) with 2RS sealing. 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 | 44.4 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 90 kN |
| Basic static load rating C0 | 64 kN |
| Fatigue load limit Pu | 2.75 kN |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1700 g |
| Manufacturer designation | 3310 A-2RS1 |
| 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 & 3300-series range
| Bore d | 1.969 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 1.748 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 30 mm |
| Smallest bore in 3300-series | 15 mm |
| Largest outer diameter in 3300-series | 240 mm |
| Width range across 3300-series | 19–92.1 mm |
| Bore position in 3300-series (smallest first) | 9 of 20 |
| Bore above smallest 3300-series size | 35 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 3310-DNRCBM | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 DNRCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs. |
| 3310-A | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs. |
| 3310-ATN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs. |
| 3310-DMA | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (90/64 kN vs 93.6/85 kN) — boundary dimensions match, not a load-rating equivalent. |
| 3310-A-2Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs. |
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 3310-A-2RS1 model number is decoded
3310 A-2RS1 is the capped double-row angular-contact ball bearing for a 50 mm shaft, 50×110×44.4 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 50×110×44.4 mm (1.969×4.331×1.748 in), 30.0 mm radial section height, C 90 kN, C0 64 kN, Pu 2.75 kN.SKF publishes only the 4,300 r/min limiting speed for this execution, catalogue mass 1700 g. Load balance: C0 64 kN against C 90 kN gives a 0.71 ratio, typical of a steep-angle axial-oriented design; Pu 2.75 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,300 r/min and no separate thermal reference is published; at dm ≈ 80.0 mm the corresponding dn is approximately 344k mm·r/min. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 4,300 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.
Typical equipment & failure modes
Common applications
- material-handling equipment
- lifetime-lubricated electric motor and gearbox positions
- agricultural machinery drives
Known failure patterns
- shield rubbing after misalignment or overheating of a 2Z execution
- grease loss when the sealed-for-life cavity is overheated with no relubrication path
- seal-lip wear and grease loss after fine abrasive dust reaches the lip contact
- snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring
- electrical pitting on VFD-driven shafts without grounding protection
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- The capped speed ceiling is 4,300 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.
- Fit and fillet rules are unchanged from the open double-row 3310: k5 on a 50 mm rotating shaft, radii clearing the chamfer.
- The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.
- Fit and fillet rules are unchanged from the open double-row 3310: k5 on a 50 mm rotating shaft, radii clearing the chamfer.
- Catalogue ratings are SKF PUB BU/P1 17000 figures for 3310 A-2RS1 as the double contactsealed execution; the other order numbers of the 3310 size are different products and may carry different ratings — always quote the full designation when purchasing.
Frequently asked questions
What are the dimensions and catalogue data of 3310-A-2RS1?
3310 A-2RS1 measures 50 mm bore × 110 mm OD × 44.4 mm width (1.969 × 4.331 × 1.748 in), mass about 1700 g. SKF 17000 ratings: C 90 kN, C0 64 kN, Pu 2.75 kN, SKF publishes only the 4,300 r/min limiting speed for this execution.
What does the A-2RS1 suffix mean?
A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling.
Can I wash or repack a capped 3310?
No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools.
What loads can 3310-A-2RS1 take?
The same bidirectional combined loads as the open double-row 3310: C 90 kN, C0 64 kN, Pu 2.75 kN. Capping changes sealing and speed, not the basic ratings.
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.