K Series Full-Ball Hybrid Ceramic Bearing (Ultra-Thin Section Type)
3NCKTA・3NCKAA・3NCKBA系 / JTEKT Corporation (Official website) / Listed on page 39 of the document
Angular contact bearing with alternating stainless steel and ceramic balls, based on the K Series ultra-thin section ball bearings for industrial robots, adapted for clean and vacuum applications.
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Specifications
| Inner diameter d | 25.4～127 mm |
|---|---|
| Outer diameter D | 34.925～130.175 mm |
| Cross-sectional Dimensions | 4.762～7.938 mm |
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (K Series Full-Ball Hybrid Ceramic Bearing (Ultra-Thin Section Type)).
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1. Bore and housing bore dimensions
This product: Inner diameter d 25.4～127 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
The 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
Available in three types: deep groove, angular contact, and four-point contact. Cross-sectional dimensions come in three series: 4.762, 6.35, and 7.938 mm. Used in wafer transfer robots and similar equipment.
Features
- Ultra-thin section type
- Compatible with clean and vacuum environments
- Alternating arrangement of stainless steel and ceramic balls
Applications
- Wafer transfer robots
- Semiconductor manufacturing equipment
- Liquid crystal manufacturing equipment
FAQ
- Q. What types are available for the K Series Full-Ball Hybrid Ceramic Bearing (Ultra-Thin Section Type)?
- A. It is available in three types: deep groove, angular contact, and four-point contact.
- Q. What are the cross-sectional dimensions and the bore and outer diameter ranges for the 3NCKTA, 3NCKAA, and 3NCKBA series?
- A. The cross-sectional dimensions are 4.762, 6.35, and 7.938 mm across three series. The bore diameter d ranges from 25.4 to 127 mm, and the outer diameter D ranges from 34.925 to 130.175 mm.
- Q. Can the K Series Full-Ball Hybrid Ceramic Bearing be used in clean and vacuum environments?
- A. Yes, it is compatible with clean and vacuum environments. It has an alternating arrangement of stainless steel and ceramic balls.
- Q. What types of equipment is the K Series Full-Ball Hybrid Ceramic Bearing mainly used in?
- A. It is used in wafer transfer robots, semiconductor manufacturing equipment, and liquid crystal manufacturing equipment.
Written by AI based on the content of the source documents.
Source documents
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