3212-ATN9 bearing: complete specifications & equivalents
The 3212-ATN9 is a ISO 15 radial bearing sized 60 x 110 x 36.5 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 60 mm |
| Outer diameter D | 110 mm |
| Width B | 36.5 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 73.5 kN |
| Basic static load rating C0 | 58.5 kN |
| Fatigue load limit Pu | 2.5 kN |
| Reference speed (thermal) | 6300 rpm |
| Limiting speed (mechanical) | 5600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1200 g |
| Manufacturer designation | 3212 ATN9 |
| 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 | 2.362 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 1.437 in |
| ISO bore code | 12 |
| Radial section height (D−d)/2 | 25 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) | 13 of 22 |
| Bore above smallest 3200-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 3212-A | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs. |
| 3212-A-2Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs. |
| 3212-A-2RS1 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 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 3212-ATN9 model number is decoded
3212 ATN9 is SKF's 60 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, 60×110×36.5 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 60×110×36.5 mm (2.362×4.331×1.437 in), 25.0 mm radial section height, C 73.5 kN, C0 58.5 kN, Pu 2.5 kN.reference speed 6,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical), catalogue mass 1200 g. Envelope economics: the 36.5 mm width over a 25.0 mm section yields 1.46 mm of ring width per section millimetre, and the bearing weighs 1200 g for 73.5 kN of dynamic capacity — about 16 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,600 r/min while thermal balance under catalogue load sets the 6,300 r/min reference; at dm ≈ 85.0 mm the corresponding dn is approximately 476k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 6,300 r/min against a 5,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.13.
Typical equipment & failure modes
Common applications
- paper-machine dryer-section gearing
- cement and mineral processing drives
- heavy gearbox shafts carrying reversing thrust
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
- TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling
- hard-particle indentation of the asymmetric raceway in unfiltered oil
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- The double-row 3212 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.
- The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.
- Compared with a single-row pair of the same bore, the double-row 3212 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.
- Interference goes on the rotating ring (about k5 at 60 mm bore); the wide 36.5 mm ring is sensitive to tilted seats, so check squareness before clamping.
- Catalogue ratings are SKF PUB BU/P1 17000 figures for 3212 ATN9 as the double atn9 execution; the other order numbers of the 3212 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 3212-ATN9?
3212 ATN9 measures 60 mm bore × 110 mm OD × 36.5 mm width (2.362 × 4.331 × 1.437 in), mass about 1200 g. SKF 17000 ratings: C 73.5 kN, C0 58.5 kN, Pu 2.5 kN, reference speed 6,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical).
What does the ATN9 suffix mean?
A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling.
Which fits should I use?
With a rotating inner ring use roughly k5 on the 60 mm shaft and H7 in the 110 mm housing; check the wide ring seats square because the 36.5 mm width is sensitive to tilt.
Why choose the double-row 3212 instead of two single-row bearings?
The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead.
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.