3211-A-2RS1 bearing: complete specifications & equivalents
The 3211-A-2RS1 is a ISO 15 radial bearing sized 55 x 100 x 33.3 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 | 55 mm |
| Outer diameter D | 100 mm |
| Width B | 33.3 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 60 kN |
| Basic static load rating C0 | 47.5 kN |
| Fatigue load limit Pu | 2 kN |
| Limiting speed (mechanical) | 4500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 910 g |
| Manufacturer designation | 3211 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 & 3200-series range
| Bore d | 2.165 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 1.311 in |
| ISO bore code | 11 |
| Radial section height (D−d)/2 | 22.5 mm |
| Smallest bore in 3200-series | 10 mm |
| Largest outer diameter in 3200-series | 200 mm |
| Width range across 3200-series | 14–69.8 mm |
| Bore position in 3200-series (smallest first) | 12 of 22 |
| Bore above smallest 3200-series size | 45 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 3211-A | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs. |
| 3211-ATN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs. |
| 3211-A-2Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 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 3211-A-2RS1 model number is decoded
3211 A-2RS1 is the capped double-row angular-contact ball bearing for a 55 mm shaft, 55×100×33.3 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 55×100×33.3 mm (2.165×3.937×1.311 in), 22.5 mm radial section height, C 60 kN, C0 47.5 kN, Pu 2 kN.SKF publishes only the 4,500 r/min limiting speed for this execution, catalogue mass 910 g. Mass and section check: 910 g inside the 55×100×33.3 mm outline leaves a 22.5 mm radial section, and the 47.5 kN static rating is 0.79× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 4,500 r/min the mean pitch diameter dm ≈ 77.5 mm implies a dn value around 349k mm·r/min; only the limiting speed is published for this execution. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 4,500 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
- agricultural machinery drives
- conveyor drum shafts
- fan and blower positions
Known failure patterns
- contamination trapped for life when a capped bearing is mounted with dirty hands or tools
- contact-seal lip hardening and grease-life expiry after long high-temperature service
- seal-lip wear and grease loss after fine abrasive dust reaches the lip contact
- loss of controlled axial clearance (CB) after thermal growth removes residual play
- rolling-contact fatigue spalling after the rated L10 life is exceeded
- raceway staining from water in the lubricant during idle periods
Selection pitfalls — read before you substitute
- The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.
- Fit and fillet rules are unchanged from the open double-row 3211: k5 on a 55 mm rotating shaft, radii clearing the chamfer.
- Fit and fillet rules are unchanged from the open double-row 3211: k5 on a 55 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.
- Catalogue ratings are SKF PUB BU/P1 17000 figures for 3211 A-2RS1 as the double contactsealed execution; the other order numbers of the 3211 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 3211-A-2RS1?
3211 A-2RS1 measures 55 mm bore × 100 mm OD × 33.3 mm width (2.165 × 3.937 × 1.311 in), mass about 910 g. SKF 17000 ratings: C 60 kN, C0 47.5 kN, Pu 2 kN, SKF publishes only the 4,500 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 3211?
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 3211-A-2RS1 take?
The same bidirectional combined loads as the open double-row 3211: C 60 kN, C0 47.5 kN, Pu 2 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.