NoWear Coated Bearing
L5DA・L7DA / SKF (Official website) / Listed on page 95 of the document
Bearing with a wear-resistant carbon coating applied to rolling elements and other components. Extends service life and relubrication intervals under conditions prone to smearing or insufficient lubrication.
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Specifications
| Coating thickness | 1～3 μm |
|---|---|
| Coating hardness | 1200 HV10 |
| Operating Temperature Range | 350 °C |
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (NoWear Coated Bearing).
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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
This product: Operating Temperature Range 350 °CFor 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
Bearing with a 1 to 3 μm carbon coating (hardness 1200 HV10) applied by physical vapor deposition. L5DA has the coating on rolling elements only; L7DA has the coating on both rolling elements and inner ring raceway surfaces. Usable up to a maximum of 350°C. Not recommended for fully dry operation or rust-prevention applications.
Features
- Wear-resistant carbon coating
- Improved smearing resistance
- Maximum operating temperature 350°C
- Stable operation even under insufficient lubricant film conditions
Applications
- Paper machines
- Marine and offshore
- Fans
- Compressors
- Hydraulic pumps
- Transmissions
- Motors
FAQ
- Q. What is the difference between the carbon coating on L5DA and L7DA?
- A. L5DA has the coating applied to rolling elements only. L7DA has the coating applied to both rolling elements and inner ring raceway surfaces.
- Q. What is the maximum operating temperature of NoWear Coated Bearings (L5DA, L7DA)?
- A. They can be used up to a maximum of 350°C.
- Q. What conditions are NoWear Coated Bearings (L5DA, L7DA) suited for?
- A. They are suited to conditions prone to smearing or insufficient lubrication, for applications aiming to extend service life and relubrication intervals. Stable operation is possible even under insufficient lubricant film conditions.
- Q. What are the thickness and hardness of the carbon coating on NoWear Coated Bearings (L5DA, L7DA)?
- A. The carbon coating applied by physical vapor deposition is 1 to 3 μm thick with a hardness of 1200 HV10.
- Q. Can NoWear Coated Bearings (L5DA, L7DA) be used for fully dry operation or rust-prevention applications?
- A. They are not recommended for fully dry operation or rust-prevention applications.
Written by AI based on the content of the source documents.
Source documents
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Catalog
SKF 転がり軸受カタログ 15 エンジニアリング製品 15A センサー軸受ユニット
120 pages Open page 95
Found on: https://azuma-eg.com/catalogue/
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