1313-EKTN9 bearing: complete specifications & equivalents
The 1313-EKTN9 is a ISO 15 radial bearing sized 65 x 140 x 33 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 65 mm |
| Outer diameter D | 140 mm |
| Width B | 33 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 65 kN |
| Basic static load rating C0 | 25.5 kN |
| Fatigue load limit Pu | 1.25 kN |
| Reference speed (thermal) | 8500 rpm |
| Limiting speed (mechanical) | 6000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2450 g |
| Manufacturer designation | 1313 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 | 2.559 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 1.299 in |
| ISO bore code | 13 |
| Radial section height (D−d)/2 | 37.5 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) | 15 of 29 |
| Bore above smallest 1300-series size | 60 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 1313 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 1313-ETN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 65×140×33 mm envelope with catalogue ratings within 10 %; 1313 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 1313-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: 1313 carries code 13 = 65 mm (code × 5). Envelope 65×140×33 mm (2.559×5.512×1.299 in) with a 37.5 mm radial section height, C 65 kN, C0 25.5 kN and Pu 1.25 kN. The open 1313 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 8500 r/min, limiting speed 6000 r/min, catalogue mass 2450 g.
Typical equipment & failure modes
Common applications
- agricultural gearboxes
- textile machinery drives
- industrial fans and blowers
- woodworking machinery
Known failure patterns
- lubricant starvation where no regreasing interval is maintained
- contamination wear when the open arrangement is used without adequate external sealing
- incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance
- adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder
- electrical pitting in VFD-driven motors without shaft grounding
- excessive misalignment loading one ball row heavily and spalling it early
Selection pitfalls — read before you substitute
- Mount 1313-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.
- At 65 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.
- On a sleeve-mounted 1313-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.
- The EKTN9 suffix on 1313-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- At 65 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 1313-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.
Frequently asked questions
What are the dimensions of 1313-EKTN9?
SKF 1313 EKTN9 measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2450 g. It is open, with no shields or seals.
How does the bore code in 1313 work?
The final two digits of 1313 are bore code 13, multiplied by 5 to give 65 mm.
Which fits should I use for 1313-EKTN9?
With a rotating inner ring use roughly k5 on the shaft and H7 in the 140 mm housing; reverse the interference if the outer ring rotates.
How heavy is 1313-EKTN9?
Catalogue mass is 2450 g for 1313 EKTN9; seal and cage executions of the same envelope differ by a few grams.
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.