4205-ATN9 bearing: complete specifications & equivalents
The 4205-ATN9 is a ISO 15 radial bearing sized 25 x 52 x 18 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 25 mm |
| Outer diameter D | 52 mm |
| Width B | 18 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 19 kN |
| Basic static load rating C0 | 14.6 kN |
| Fatigue load limit Pu | 0.62 kN |
| Reference speed (thermal) | 20000 rpm |
| Limiting speed (mechanical) | 11000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 170 g |
| Manufacturer designation | 4205 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 & 4200-series range
| Bore d | 0.984 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.709 in |
| ISO bore code | 05 |
| Radial section height (D−d)/2 | 13.5 mm |
| Smallest bore in 4200-series | 10 mm |
| Largest outer diameter in 4200-series | 160 mm |
| Width range across 4200-series | 14–40 mm |
| Bore position in 4200-series (smallest first) | 6 of 19 |
| Bore above smallest 4200-series size | 15 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 62205-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×18 mm envelope as SKF 62205-2RS1, but catalogue C/C0 differ (19/14.6 kN vs 14/7.8 kN) — envelope match only after a load check. |
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 4205-ATN9 model number is decoded
4205 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4205 carries code 05 = 25 mm (code × 5). Two complete ball sets share the 25×52×18 mm (0.984×2.047×0.709 in) envelope, giving C 19 kN, C0 14.6 kN and Pu 0.62 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 11000 r/min, mass 170 g. The arrangement is open and requires external sealing.
Typical equipment & failure modes
Common applications
- fans with axial thrust reversals
- industrial wheel arrangements
- double-supported pump impeller shafts
- gearbox layshafts with reversing axial load
Known failure patterns
- uneven load sharing between the two raceways when one ring is tilted
- polyamide cage embrittlement after sustained high-temperature service
- brinelling from static overload or hammer blows during mounting
- false brinelling from vibration while the shaft stands idle
Selection pitfalls — read before you substitute
- Double-row 4205 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.
- C 19 kN in a 18 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.
- Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4205-ATN9 is sensitive to cocking during pressing.
- The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 25 mm position.
- The wide 25×52×18 mm envelope is not interchangeable with a single-row 6205 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.
- Fillet radii must clear the 4205-ATN9 chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
Frequently asked questions
What are the dimensions of 4205-ATN9?
Double-row 4205 ATN9 measures 25×52×18 mm (0.984×2.047×0.709 in), about 170 g.
What does ATN9 mean on 4205 ATN9?
A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C.
Why choose a double-row 42xx/43xx bearing?
Two ball rows give higher C (19 kN for 4205-ATN9), reversing axial capacity and some moment stiffness in one 18 mm-wide unit — useful on gearbox layshafts and pump shafts.
Is 4205-ATN9 interchangeable with a 62-series single-row bearing?
No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 25×52×18 mm is its own envelope.
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.