PL
Needle radial bearing NK 20/20 SKF 20 × 28 × 20 mm
Specifications
NK 20/20 SKF
- Designation
- NK 20/20
- Manufacturer
- SKF
- Inner diameter d
- 20 mm
- Outer diameter D
- 28 mm
- Width B
- 20 mm
- Dynamic load rating C
- 16.5 kN
- Static load rating C0
- 25.5 kN
- Limiting speed
- 22 000 rpm
- Nominal speed
- 19 000 rpm
- Weight
- 0.034 kg
- Chamfer radius r
- 0.3 mm
- Rolling elements
- Needle bearings
- Load type
- Radial
- Internal generatrix F
- 20 mm
- Outer ring width C
- 20 mm
Product summary
NK 20/20: needle roller bearing, brand SKF. Bore diameter d 20 mm, outside diameter D 28 mm, width B 20 mm. Dynamic load rating C 16.5 kN, static load rating C0 25.5 kN, limiting speed 22 000 rpm, weight 0.034 kg.
Needle rollers give a low cross-section for the same radial load capacity, so the assembly is more compact and lighter. It takes no axial load.
Where it is used
Connecting rod ends and piston pins, universal joint spiders, gearbox and transfer case shafts, cam and lever mechanisms, planetary gear sets, pumps. Used where the radial space is strictly limited while the radial load is high.
When not to use
Do not fit it instead of a ball bearing as a plain shaft support: it takes no axial load at all and does not locate the shaft axially, so the shaft will move along its axis at the first axial force. Designs without an inner ring (needle cage, drawn cup) need the shaft journal itself as the raceway, hardened to 58–64 HRC and ground. On an unhardened shaft the needles will dent the raceway within hours of operation.
Technical data is for information only. Drawings may not show all design features.
About the technical data
* - Technical specifications and other information are provided for reference only. We provide this data and believe the information to be reliable, however, no guarantee of accuracy or completeness of such information can be provided.
- Drawings and images may not reflect all design features of the product.