Precision Cylindrical Roller Bearings
NN3000 / NNU4900 / N1000 / 3NCN1000 / HAN1000 / JTEKT Corporation (Official website) / Listed on page 114 of the document
Double-row and single-row cylindrical roller bearing series for machine tool spindles, ranging from standard to high-speed and ultra-high-speed types.
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How to choose Rolling Bearings
Points to check when selecting, with the values for this product (Precision Cylindrical Roller Bearings).
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1. Bore and housing bore dimensions
Select 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
Includes the double-row standard series (NN3000, NNU4900), single-row N1000 type cylindrical roller bearings for high speed, the ceramic rolling element 3NCN1000, and HAN1000 (Hi-Ability). Tapered bore and oil hole types are also available.
Features
- High precision
- High speed, low temperature rise
- Tapered bore types available
- Oil hole and oil groove types available
Applications
- Machine tool spindles
FAQ
- Q. What applications are the NN3000 series precision cylindrical roller bearings suited for?
- A. The NN3000 is a double-row standard series cylindrical roller bearing suited for machine tool spindles.
- Q. What is a ceramic rolling element bearing such as the 3NCN1000?
- A. The 3NCN1000 is a cylindrical roller bearing that uses ceramic rolling elements. It is included in the high-speed series.
- Q. What types of part numbers are available in series such as NN3000 and N1000?
- A. Available types include the double-row standard series (NN3000, NNU4900), single-row N1000 type cylindrical roller bearings for high speed, the ceramic rolling element 3NCN1000, and HAN1000 (Hi-Ability). Tapered bore and oil hole types are also available.
- Q. What are the features of precision cylindrical roller bearings, and are tapered bore and oil hole types available?
- A. Key features are high precision and high speed with low temperature rise. Tapered bore types are available, and oil hole and oil groove types are also available.
Written by AI based on the content of the source documents.
Source documents
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