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SKF
Angular Contact Ball B. SKF 3305 ATN9
- Technical data
- Inner diameter
- 25 mm
- Outer diameter
- 62 mm
- Width
- 25,4 mm
- Material
- Standard bearing steel
- Ball rows
- Double row bearing
- Seal
- None, open bearing
- Cage
- Polyamide cage
- Clearance
- Normal radial clearance
- Running accuracy
- Dimensional accuracy P6, Running accuracy P5
- Outer ring
- Without flange/groove
- Contact angle
- 30 degree
- Arrangement
- Standard version
- Temperature range
- -20 to +120 °C
- Version
- Explorer
- Weight
- 0,344 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 25 | 2,65 € | 50,32 € |
| 35 | 5,31 € | 47,66 € |
Angular Contact Ball B. SKF 3305 ATN9
The SKF 3305 ATN9 double-row angular contact ball bearing accommodates radial and axial loads on both sides, whilst featuring compact dimensions of 25 × 62 × 25.4 mm.
This 3305 ATN9 angular contact ball bearing from SKF is designed as a double-row bearing and belongs to the SKF Explorer performance class. The design is functionally equivalent to two single-row angular contact ball bearings in an O-arrangement, but requires less axial installation space than two individual bearings. Manufactured from standard rolling-element bearing steel (100Cr6), the component is suitable for combined forces where radial loads occur simultaneously with axial forces acting in both directions. With a bore of 25 mm, an outer diameter of 62 mm and a width of 25.4 mm, the unit fits into numerous industrial bearing housings.
What is the 3305 ATN9 angular contact ball bearing suitable for in operation?
Typical applications include situations where shaft guides require rigid support and tilting moments need to be counteracted. Thanks to its 30-degree contact angle, the roller bearing effectively transmits axial forces in both directions. As an open bearing without integrated sealing washers, it is designed for operation in oil- or grease-lubricated housings. Design engineers and maintenance personnel use this design in compact assemblies that require fixed axial guidance and the simultaneous absorption of radial and axial forces.
What is the significance of the polyamide cage and the tolerance class?
The suffix ATN9 indicates a polyamide cage. This material ensures smooth ball guidance and reduces internal friction within the rolling element ring. The component retains its dimensional stability at operating temperatures ranging from –20 to +120 degrees. In addition, a defined level of precision is provided: dimensional accuracy corresponds to class P6, whilst running accuracy is manufactured to P5. This minimises runout error during rotation and supports applications with increased runout requirements.
What are the dimensions of the 3305 ATN9 angular contact ball bearing?
The dimensions are 25 mm internal diameter, 62 mm external diameter and 25.4 mm overall width. The outer ring is cylindrical in design and has neither a flange nor a ring groove. This design therefore complies with the standardised dimensions for double-row angular contact ball bearings of this size.
What does the suffix ATN9 mean for this roller bearing?
ATN9 refers to the cage being made of polyamide. The material keeps the rolling elements at a distance and is characterised by its low weight and elastic properties, which contribute to the bearing’s quiet operation.
What is the temperature range for which the bearing is specified?
The permissible operating range is between -20 and +120 degrees Celsius. This range is determined by the polyamide cage used and the hardened standard roller bearing steel (100Cr6). Lubricants must be selected for operation that form a load-bearing lubricating film within this temperature range.
In which directions can the double-row angular contact ball bearing support loads?
Due to the 30-degree contact angle and the double-row arrangement, the bearing absorbs both radial and axial forces from both directions simultaneously. Furthermore, the internal O-geometry provides rigid support against tilting moments, which is why the component is suitable for use as a fixed bearing for precise axial shaft positioning.
Is the 3305 ATN9 angular contact ball bearing sealed?
No, it is an open bearing with no contact seals or cover plates. The lubricant must be applied via the surrounding machine housing and protected against leakage and contamination by external sealing elements such as shaft seals.
What do the tolerance classes P6 and P5 mean?
This specification means that the external dimensions, such as the bore and diameter, are manufactured to tolerance class P6, whilst the concentricity meets the stricter P5 class. Compared with bearings with standard tolerances, this grading offers a tighter manufacturing tolerance and reduces vibration during shaft operation.
SKF Group
Sven Wingquists Gata 2, 415 50 Gothenburg, Sweden
info@skf.com, https://www.skf.com/uk/footer/site-ownership
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