1306-ETN9 bearing: complete specifications & equivalents
The 1306-ETN9 is a ISO 15 radial bearing sized 30 x 72 x 19 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 30 mm |
| Outer diameter D | 72 mm |
| Width B | 19 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 22.5 kN |
| Basic static load rating C0 | 6.8 kN |
| Fatigue load limit Pu | 0.36 kN |
| Reference speed (thermal) | 19000 rpm |
| Limiting speed (mechanical) | 13000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 390 g |
| Manufacturer designation | 1306 ETN9 |
| 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 | 1.181 in |
|---|---|
| Outer diameter D | 2.835 in |
| Width B | 0.748 in |
| ISO bore code | 06 |
| Radial section height (D−d)/2 | 21 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) | 8 of 29 |
| Bore above smallest 1300-series size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 1306 | 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. |
| 1306-EKTN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 30×72×19 mm envelope with catalogue ratings within 10 %; 1306 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore 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 1306-ETN9 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: 1306 carries code 06 = 30 mm (code × 5). Envelope 30×72×19 mm (1.181×2.835×0.748 in) with a 21.0 mm radial section height, C 22.5 kN, C0 6.8 kN and Pu 0.36 kN. The open 1306 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 30 mm shaft. Reference (thermal) speed 19000 r/min, limiting speed 13000 r/min, catalogue mass 390 g.
Typical equipment & failure modes
Common applications
- textile spindles and looms
- fan and blower shafts
- woodworking machine spindles
- light gearbox layshafts
Known failure patterns
- contamination wear when the open arrangement is used without adequate external sealing
- lubricant starvation where no regreasing interval is maintained
- excessive misalignment loading one ball row heavily and spalling it early
- rolling-contact fatigue spalling once the catalogue L10 life is exceeded
Selection pitfalls — read before you substitute
- The fatigue load limit is 0.36 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- The spherical outer raceway lets 1306-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.
- The ETN9 suffix on 1306-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 13000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- At 30 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.
- The spherical outer raceway lets 1306-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.
- Fillet radii must clear the 1306-ETN9 chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
Frequently asked questions
What are the dimensions of 1306-ETN9?
SKF 1306 ETN9 measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 390 g. It is open, with no shields or seals.
How does the bore code in 1306 work?
The final two digits of 1306 are bore code 06, multiplied by 5 to give 30 mm.
How heavy is 1306-ETN9?
Catalogue mass is 390 g for 1306 ETN9; seal and cage executions of the same envelope differ by a few grams.
What load can 1306-ETN9 take?
Catalogue values for 1306 ETN9: dynamic C 22.5 kN, static C0 6.8 kN, fatigue limit Pu 0.36 kN. Use C in life calculation and C0 for static checks at 30 mm bore.
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.