Angular Contact Ball Bearing 7900C Series (Contact Angle 15°)
7900C / JTEKT Corporation (Official website) / Listed on page 76 of the document
Single-row angular contact ball bearing with a 15° contact angle. Bore diameter range 10 to 75 mm, with high axial rigidity.
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Specifications
| Inner diameter d | 10 to 75 mm |
|---|---|
| Basic dynamic load rating Cr | 3.25〜51.0 kN |
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (Angular Contact Ball Bearing 7900C Series (Contact Angle 15°)).
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1. Bore and housing bore dimensions
This product: Inner diameter d 10 to 75 mmSelect the bore diameter d to match the shaft seat, the outside diameter D to match the housing bore, and the width B to suit the installation space. Main dimensions are standardized in ISO and JIS dimension series, so interchangeable products can be found by boundary dimension designation. For tapered roller bearings, also check the assembled width T; for thrust bearings, also check the height H.
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2. Dynamic load rating based on life calculation
This product: Basic dynamic load rating Cr 3.25〜51.0 kNThe basic dynamic load rating Cr is the reference value for calculating rated life. Verify that the required life is met using the equivalent load during operation and the rotational speed. For ball bearings, life is proportional to the cube of the load ratio, so providing load margin greatly extends life.
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3. Margin for static and shock loads
The basic static load rating C0r is the allowable standard for permanent deformation generated at the rolling elements and raceways under stationary or low-speed conditions. For applications with oscillating motion or shock loads, confirm that a static safety factor against the maximum load is secured using C0r.
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4. Operating speed and lubrication method
The limiting speed differs by lubrication method, and separate values are given for grease lubrication and oil lubrication. Confirm that the normal operating speed does not exceed the limiting value, and in high-speed ranges also consider cage material and precision grade. The reference speed can also be consulted as a thermal guideline.
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5. Precision grade and internal clearance
Precision grades (P0, P6, P5, etc.) indicate rotational accuracy and dimensional accuracy; for high-precision applications such as machine tool spindles, select higher grades. Internal clearance (C2, CN, C3, etc.) is selected to allow for changes caused by interference fit and temperature differences during operation.
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6. Materials and lubrication suited to the environment
For corrosive, high-temperature, vacuum, or clean environments, select specifications such as rings and rolling elements made of stainless steel or ceramics, or solid lubricants and fluorine grease for vacuum use. Check the operating temperature range, low dust generation, and whether food-grade grease registration applies against the application conditions.
This guide was written by AI based on the listed products' documents and specification items.
Description
7900C series with bore diameters from 10 mm to 75 mm. With a 15° contact angle, a larger contact angle results in a smaller axial displacement and higher rigidity. Materials on preload and axial load characteristics for combined use are provided.
Features
- High rigidity with 15° contact angle
- Compatible with duplex preload
Applications
- Machine tool spindles
- High-speed rotating parts
FAQ
- Q. What is the bore diameter range of the 7900C series angular contact ball bearings, and what are the features of the 15° contact angle?
- A. The bore diameter range is 10 to 75 mm. With a 15° contact angle, a larger contact angle results in a smaller axial displacement and higher rigidity.
- Q. What is the basic dynamic load rating of the 7900C series angular contact ball bearings?
- A. The basic dynamic load rating Cr is 3.25 to 51.0 kN.
- Q. Can the 7900C series angular contact ball bearings be used in combination or under preload?
- A. Yes, they are compatible with duplex preload. Materials on preload and axial load characteristics for combined use are provided.
- Q. What applications are the 7900C series angular contact ball bearings suited for?
- A. They are used in machine tool spindles and high-speed rotating parts. They are single-row angular contact ball bearings with high rigidity from a 15° contact angle.
Written by AI based on the content of the source documents.
Source documents
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