1305-EKTN9 bearing: complete specifications & equivalents
The 1305-EKTN9 is a ISO 15 radial bearing sized 25 x 62 x 17 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 | 62 mm |
| Width B | 17 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 | 5.4 kN |
| Fatigue load limit Pu | 0.28 kN |
| Reference speed (thermal) | 22000 rpm |
| Limiting speed (mechanical) | 15000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 260 g |
| Manufacturer designation | 1305 EKTN9 |
| 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 & 1300-series range
| Bore d | 0.984 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 0.669 in |
| ISO bore code | 05 |
| Radial section height (D−d)/2 | 18.5 mm |
| Smallest bore in 1300-series | 5 mm |
| Largest outer diameter in 1300-series | 320 mm |
| Width range across 1300-series | 6–74 mm |
| Bore position in 1300-series (smallest first) | 7 of 29 |
| Bore above smallest 1300-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 1305 | NTN | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 1305-ETN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 25×62×17 mm envelope with catalogue ratings within 10 %; 1305 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore 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 1305-EKTN9 model number is decoded
The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1305 carries code 05 = 25 mm (code × 5). Envelope 25×62×17 mm (0.984×2.441×0.669 in) with a 18.5 mm radial section height, C 19 kN, C0 5.4 kN and Pu 0.28 kN. The open 1305 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 22000 r/min, limiting speed 15000 r/min, catalogue mass 260 g.
Typical equipment & failure modes
Common applications
- woodworking machine spindles
- light gearbox layshafts
- food-processing conveyors
- small electric motors
Known failure patterns
- contamination wear when the open arrangement is used without adequate external sealing
- lubricant starvation where no regreasing interval is maintained
- adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder
- incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance
- fretting corrosion on a creeping shaft or housing seat
- cage damage from running beyond the limiting speed
Selection pitfalls — read before you substitute
- Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1305-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.
- Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1305-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.
- On a sleeve-mounted 1305-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.
- The EKTN9 suffix on 1305-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 15000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- The fatigue load limit is 0.28 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.
Frequently asked questions
What are the dimensions of 1305-EKTN9?
SKF 1305 EKTN9 measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 260 g. It is open, with no shields or seals.
How does the bore code in 1305 work?
The final two digits of 1305 are bore code 05, multiplied by 5 to give 25 mm.
What is the speed rating of 1305-EKTN9?
SKF lists a 22000 r/min thermal reference speed and a 15000 r/min mechanical limiting speed for 1305 EKTN9; real limits also depend on lubrication and fits.
How much misalignment can 1305-EKTN9 tolerate?
Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1305-EKTN9 allow less (about 1°) because the seal lip binds first.
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.