3207-ATN9 bearing: complete specifications & equivalents
The 3207-ATN9 is a ISO 15 radial bearing sized 35 x 72 x 27 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 35 mm |
| Outer diameter D | 72 mm |
| Width B | 27 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 40 kN |
| Basic static load rating C0 | 28 kN |
| Fatigue load limit Pu | 1.18 kN |
| Reference speed (thermal) | 10000 rpm |
| Limiting speed (mechanical) | 9000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 440 g |
| Manufacturer designation | 3207 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 | 1.378 in |
|---|---|
| Outer diameter D | 2.835 in |
| Width B | 1.063 in |
| ISO bore code | 07 |
| Radial section height (D−d)/2 | 18.5 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) | 8 of 22 |
| Bore above smallest 3200-series size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 3207-A | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs. |
| 3207-A-2Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs. |
| 3207-A-2RS1 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 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 3207-ATN9 model number is decoded
3207 ATN9 is SKF's 35 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, 35×72×27 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 35×72×27 mm (1.378×2.835×1.063 in), 18.5 mm radial section height, C 40 kN, C0 28 kN, Pu 1.18 kN.reference speed 10,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 440 g. At the printed limiting speed of 9,000 r/min the mean pitch diameter dm ≈ 53.5 mm implies a dn value around 482k mm·r/min; the 10,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 27 mm width over a 18.5 mm section yields 1.46 mm of ring width per section millimetre, and the bearing weighs 440 g for 40 kN of dynamic capacity — about 11 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 10,000 r/min against a 9,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.11.
Typical equipment & failure modes
Common applications
- gearbox input and output shafts with bidirectional thrust
- two-direction thrust positions without room for a paired single-row set
- centrifugal pump shafts
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
- edge loading from shaft deflection or housing misalignment
- hard-particle indentation of the asymmetric raceway in unfiltered oil
Selection pitfalls — read before you substitute
- A capped 3207-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.
- 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.
- Catalogue ratings of 40/28 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.
- Catalogue ratings of 40/28 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 3207 ATN9 as the double atn9 execution; the other order numbers of the 3207 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 3207-ATN9?
3207 ATN9 measures 35 mm bore × 72 mm OD × 27 mm width (1.378 × 2.835 × 1.063 in), mass about 440 g. SKF 17000 ratings: C 40 kN, C0 28 kN, Pu 1.18 kN, reference speed 10,000 r/min (thermal) and limiting speed 9,000 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.
What does the D mean in ATN9?
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 3207 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.