3210-A bearing: complete specifications & equivalents
The 3210-A is a ISO 15 radial bearing sized 50 x 90 x 30.2 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 | 90 mm |
| Width B | 30.2 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 51 kN |
| Basic static load rating C0 | 42.5 kN |
| Fatigue load limit Pu | 1.8 kN |
| Reference speed (thermal) | 8000 rpm |
| Limiting speed (mechanical) | 7000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 650 g |
| Manufacturer designation | 3210 A |
| 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 | 1.969 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 1.189 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 20 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) | 11 of 22 |
| Bore above smallest 3200-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 3210-ATN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs. |
| 3210-A-2Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs. |
| 3210-A-2RS1 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 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 3210-A model number is decoded
3210 A is SKF's 50 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 50×90×30.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 50×90×30.2 mm (1.969×3.543×1.189 in), 20.0 mm radial section height, C 51 kN, C0 42.5 kN, Pu 1.8 kN.reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), catalogue mass 650 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,000 r/min while thermal balance under catalogue load sets the 8,000 r/min reference; at dm ≈ 70.0 mm the corresponding dn is approximately 490k mm·r/min. Envelope economics: the 30.2 mm width over a 20.0 mm section yields 1.51 mm of ring width per section millimetre, and the bearing weighs 650 g for 51 kN of dynamic capacity — about 13 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 8,000 r/min against a 7,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.14.
Typical equipment & failure modes
Common applications
- centrifugal pump shafts
- elevator and hoist machinery
- printing and converting machinery
Known failure patterns
- loss of controlled axial clearance (CB) after thermal growth removes residual play
- tilted mounting that loads one double row more heavily than the other
- stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive
- mounting score marks when the bearing is cocked over a burr or keyway
- hard-particle indentation of the asymmetric raceway in unfiltered oil
Selection pitfalls — read before you substitute
- Interference goes on the rotating ring (about k5 at 50 mm bore); the wide 30.2 mm ring is sensitive to tilted seats, so check squareness before clamping.
- A capped 3210-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.
- Interference goes on the rotating ring (about k5 at 50 mm bore); the wide 30.2 mm ring is sensitive to tilted seats, so check squareness before clamping.
- Compared with a single-row pair of the same bore, the double-row 3210 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.
- Catalogue ratings are SKF PUB BU/P1 17000 figures for 3210 A as the double a steel execution; the other order numbers of the 3210 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 3210-A?
3210 A measures 50 mm bore × 90 mm OD × 30.2 mm width (1.969 × 3.543 × 1.189 in), mass about 650 g. SKF 17000 ratings: C 51 kN, C0 42.5 kN, Pu 1.8 kN, reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical).
What does the A suffix mean?
A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage.
What does the D mean in A?
D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB).
Does the 3210 double-row bearing need pairing?
No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment.
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.