3211-A-2Z bearing: complete specifications & equivalents
The 3211-A-2Z is a ISO 15 radial bearing sized 55 x 100 x 33.3 mm (bore x OD x width) with ZZ 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 | ZZ |
| 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) | 6300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 910 g |
| Manufacturer designation | 3211 A-2Z |
| 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-2RS1 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) 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-2Z model number is decoded
3211 A-2Z 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. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. 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 6,300 r/min limiting speed for this execution, catalogue mass 910 g. Sizing arithmetic on the 55 mm bore: 60 kN C divided by the 22.5 mm radial section height gives 2.7 kN per section millimetre; the 910 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 47.5 kN against C 60 kN gives a 0.79 ratio, typical of a steep-angle axial-oriented design; Pu 2 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 6,300 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.
Typical equipment & failure modes
Common applications
- lifetime-lubricated electric motor and gearbox positions
- agricultural machinery drives
- conveyor drum shafts
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
- grease escape past the non-contact shields in an overfilled or vertically mounted position
- two-direction thrust overload concentrating load on one row and spalling its raceway
- fretting corrosion on a loose rotating shaft seat
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- The capped speed ceiling is 6,300 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.
- The non-contact shields cap the speed with negligible drag: 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 3211: k5 on a 55 mm rotating shaft, radii clearing the chamfer.
- The non-contact shields cap the speed with negligible drag: 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-2Z as the double shielded 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-2Z?
3211 A-2Z 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 6,300 r/min limiting speed for this execution.
What does the A-2Z suffix mean?
A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance.
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-2Z 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.