3201-ATN9 bearing: complete specifications & equivalents
The 3201-ATN9 is a ISO 15 radial bearing sized 12 x 32 x 15.9 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 12 mm |
| Outer diameter D | 32 mm |
| Width B | 15.9 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 10.1 kN |
| Basic static load rating C0 | 5.6 kN |
| Fatigue load limit Pu | 0.24 kN |
| Reference speed (thermal) | 24000 rpm |
| Limiting speed (mechanical) | 22000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 58 g |
| Manufacturer designation | 3201 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 | 0.472 in |
|---|---|
| Outer diameter D | 1.26 in |
| Width B | 0.626 in |
| ISO bore code | 01 |
| Radial section height (D−d)/2 | 10 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) | 2 of 22 |
| Bore above smallest 3200-series size | 2 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 3201-A-2Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 12×32×15.9 mm envelope with catalogue ratings within 10 %; 3201 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs. |
| 3201-A-2RS1 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 12×32×15.9 mm envelope with catalogue ratings within 10 %; 3201 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 3201-ATN9 model number is decoded
3201 ATN9 is SKF's 12 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, 12×32×15.9 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 12×32×15.9 mm (0.472×1.26×0.626 in), 10.0 mm radial section height, C 10.1 kN, C0 5.6 kN, Pu 0.24 kN.reference speed 24,000 r/min (thermal) and limiting speed 22,000 r/min (mechanical), catalogue mass 58 g. Selection figures for 3201 ATN9: the static-to-dynamic ratio C0/C is 0.55, Pu 0.24 kN is about 2 % of C, and catalogue mass works out to roughly 5 g per millimetre of bore. At the printed limiting speed of 22,000 r/min the mean pitch diameter dm ≈ 22.0 mm implies a dn value around 484k mm·r/min; the 24,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 32 over bore 12 is a 2.67× step for this size, and the 15.9 mm width gives a bore/width ratio of 0.75; use these ratios when housing space around the 12 mm shaft is the first constraint.
Typical equipment & failure modes
Common applications
- compact pump and compressor drives
- textile machinery roller drives
- small two-bearing-housing arrangements
Known failure patterns
- two-direction thrust overload concentrating load on one row and spalling its raceway
- loss of controlled axial clearance (CB) after thermal growth removes residual play
- TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling
- brinelling from pressing the ring home through the balls or from static overload
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- 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.
- A capped 3201-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.
- Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.
- Catalogue ratings of 10.1/5.6 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.
- Catalogue ratings are SKF PUB BU/P1 17000 figures for 3201 ATN9 as the double atn9 execution; the other order numbers of the 3201 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 3201-ATN9?
3201 ATN9 measures 12 mm bore × 32 mm OD × 15.9 mm width (0.472 × 1.26 × 0.626 in), mass about 58 g. SKF 17000 ratings: C 10.1 kN, C0 5.6 kN, Pu 0.24 kN, reference speed 24,000 r/min (thermal) and limiting speed 22,000 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 j5 on the 12 mm shaft and H7 in the 32 mm housing; check the wide ring seats square because the 15.9 mm width is sensitive to tilt.
Why choose the double-row 3201 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.