1301-ETN9 bearing: complete specifications & equivalents
The 1301-ETN9 is a ISO 15 radial bearing sized 12 x 37 x 12 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 12 mm |
| Outer diameter D | 37 mm |
| Width B | 12 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 9.36 kN |
| Basic static load rating C0 | 2.16 kN |
| Fatigue load limit Pu | 0.12 kN |
| Reference speed (thermal) | 40000 rpm |
| Limiting speed (mechanical) | 28000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 67 g |
| Manufacturer designation | 1301 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 | 0.472 in |
|---|---|
| Outer diameter D | 1.457 in |
| Width B | 0.472 in |
| ISO bore code | 01 |
| Radial section height (D−d)/2 | 12.5 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) | 3 of 29 |
| Bore above smallest 1300-series size | 7 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 1301 | 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. |
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 1301-ETN9 model number is decoded
The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). bore code 01 follows the 10/12/15/17 mm exception table, so 1301 fits a 12 mm shaft. Envelope 12×37×12 mm (0.472×1.457×0.472 in) with a 12.5 mm radial section height, C 9.36 kN, C0 2.16 kN and Pu 0.12 kN. The open 1301 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 12 mm shaft. Reference (thermal) speed 40000 r/min, limiting speed 28000 r/min, catalogue mass 67 g.
Typical equipment & failure modes
Common applications
- fan and blower shafts
- woodworking machine spindles
- light gearbox layshafts
- food-processing conveyors
Known failure patterns
- lubricant starvation where no regreasing interval is maintained
- contamination wear when the open arrangement is used without adequate external sealing
- 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 1301-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.
- Fillet radii must clear the 1301-ETN9 chamfer so the 12 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- The ETN9 suffix on 1301-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 28000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- Catalogue ratings for 1301-ETN9 (C 9.36 kN, C0 2.16 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.
- Mount 1301-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.
- The fatigue load limit is 0.12 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
Frequently asked questions
What are the dimensions of 1301-ETN9?
SKF 1301 ETN9 measures 12 mm bore × 37 mm OD × 12 mm width (0.472 × 1.457 × 0.472 in), mass about 67 g. It is open, with no shields or seals.
How does the bore code in 1301 work?
Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 1301 fits a 12 mm shaft. Code × 5 starts at code 04.
Which fits should I use for 1301-ETN9?
With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 37 mm housing; reverse the interference if the outer ring rotates.
How heavy is 1301-ETN9?
Catalogue mass is 67 g for 1301 ETN9; 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.