NN3000 Series Cylindrical Roller Bearings
NN3000 / NN3000K / NN3000W / JTEKT Corporation (Official website) / Listed on page 109 of the document
Double-row cylindrical roller bearings for machine tool spindles. Dimension tables cover bore diameters of 25 to 150 mm, available in cylindrical bore and tapered bore types.
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Specifications
| Inner diameter d | 25〜150 mm |
|---|---|
| Outer diameter D | 47〜225 mm |
| Basic dynamic load rating (NN3005) | 32.2 kN |
| Permissible speed (grease, NN3005) | 19000 min-1 |
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (NN3000 Series Cylindrical Roller Bearings).
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1. Bore and housing bore dimensions
This product: Inner diameter d 25〜150 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
Double-row cylindrical roller bearings with high rigidity, suitable for high-speed rotation. The tapered bore type allows internal clearance adjustment by push-in amount. W specification versions are available with oil holes and oil grooves on the outer ring.
Features
- Double-row design with high radial rigidity
- Two types: cylindrical bore and tapered bore
- Available in W specification with oil holes and oil grooves
Applications
- Machine tool spindles
FAQ
- Q. What applications are NN3000 Series cylindrical roller bearings suited for?
- A. They are double-row cylindrical roller bearings for machine tool spindles, offering high rigidity and suitability for high-speed rotation.
- Q. What are the bore and outer diameter ranges of the NN3000 Series, and what bore types are available?
- A. Bore diameter d is 25 to 150 mm and outside diameter D is 47 to 225 mm. Two bore types are available: cylindrical bore and tapered bore.
- Q. How is internal clearance adjusted in the tapered bore type NN3000K?
- A. Internal clearance can be adjusted by the push-in amount.
- Q. How does the NN3000W differ from the standard model?
- A. The NN3000W is a W specification with oil holes and oil grooves on the outer ring.
- Q. What are the basic dynamic load rating and permissible rotational speed with grease for the NN3005?
- A. The basic dynamic load rating is 32.2 kN, and the permissible rotational speed with grease is 19000 min-1.
Written by AI based on the content of the source documents.
Source documents
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