PL
Angular contact ball bearing QJ 308 MA SKF 40 × 90 × 23 mm
Specifications
QJ 308 MA SKF
- Designation
- QJ 308 MA
- Manufacturer
- SKF
- Inner diameter d
- 40 mm
- Outer diameter D
- 90 mm
- Width B
- 23 mm
- Dynamic load rating C
- 78 kN
- Static load rating C0
- 64 kN
- Limiting speed
- 14 000 rpm
- Weight
- 0.78 kg
- Chamfer radius r
- 1.5 mm
- Rolling elements
- Ball bearings
- Load type
- Radial and axial
Product summary
QJ 308 MA: angular contact ball bearing, brand SKF. Bore diameter d 40 mm, outside diameter D 90 mm, width B 23 mm. Dynamic load rating C 78 kN, static load rating C0 64 kN, limiting speed 14 000 rpm, weight 0.78 kg.
The contact angle lets it carry combined loads: radial together with axial. A single-row bearing takes axial load in one direction only, so it is mounted in pairs or sets.
Where it is used
Machine tool spindles in DB, DF and DT sets, centrifugal pump and compressor shafts, worm gearboxes, motor spindles. A 15° contact angle is chosen for speed, 40° for axial load.
When not to use
Do not fit a single one instead of a deep groove ball bearing: it takes axial load in one direction only, an opposing force pushes the rings apart, the rolling elements leave the raceway and the assembly comes apart in operation. Do not fit it instead of a tapered roller bearing under axial shock loads: the point contact of the ball gives a lower static load rating C0, the raceways get dented and the assembly then runs noisy and knocks regardless of lubricant quality.
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.