3208-ATN9 bearing: complete specifications & equivalents
The 3208-ATN9 is a ISO 15 radial bearing sized 40 x 80 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 | 40 mm |
| Outer diameter D | 80 mm |
| Width B | 30.2 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 48 kN |
| Basic static load rating C0 | 36.5 kN |
| Fatigue load limit Pu | 1.56 kN |
| Reference speed (thermal) | 9000 rpm |
| Limiting speed (mechanical) | 8000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 570 g |
| Manufacturer designation | 3208 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 | 1.575 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 1.189 in |
| ISO bore code | 08 |
| 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) | 9 of 22 |
| Bore above smallest 3200-series size | 30 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 3208-A | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs. |
| 3208-A-2Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs. |
| 3208-A-2RS1 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 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 3208-ATN9 model number is decoded
3208 ATN9 is SKF's 40 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, 40×80×30.2 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 40×80×30.2 mm (1.575×3.15×1.189 in), 20.0 mm radial section height, C 48 kN, C0 36.5 kN, Pu 1.56 kN.reference speed 9,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 570 g. The 1.56 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 48/36.5 kN ratings and 570 g mass this execution carries about 1.20 kN of C per millimetre of bore. Load balance: C0 36.5 kN against C 48 kN gives a 0.76 ratio, typical of a double-row bidirectional design; Pu 1.56 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 80 over bore 40 is a 2.00× step for this size, and the 30.2 mm width gives a bore/width ratio of 1.32; use these ratios when housing space around the 40 mm shaft is the first constraint.
Typical equipment & failure modes
Common applications
- two-direction thrust positions without room for a paired single-row set
- centrifugal pump shafts
- elevator and hoist machinery
Known failure patterns
- snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring
- two-direction thrust overload concentrating load on one row and spalling its raceway
- TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling
- raceway staining from water in the lubricant during idle periods
- raceway staining from water in the lubricant during idle periods
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 3208-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.
- A capped 3208-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.
- Catalogue ratings of 48/36.5 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 3208 ATN9 as the double atn9 execution; the other order numbers of the 3208 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 3208-ATN9?
3208 ATN9 measures 40 mm bore × 80 mm OD × 30.2 mm width (1.575 × 3.15 × 1.189 in), mass about 570 g. SKF 17000 ratings: C 48 kN, C0 36.5 kN, Pu 1.56 kN, reference speed 9,000 r/min (thermal) and limiting speed 8,000 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.
Does the 3208 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.
Which fits should I use?
With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the 80 mm housing; check the wide ring seats square because the 30.2 mm width is sensitive to tilt.
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.