Double-Row Full Complement Cylindrical Roller Bearing
NNCL型・NNCF型・NNC型・NNF型 / SKF (Official website) / Listed on page 14 of the document
A double-row full complement cylindrical roller bearing. Non-separable type; NNF type has seals and is used for axial location in both directions.
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Specifications
| NNF type outer ring width difference | 1 mm |
|---|
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (Double-Row Full Complement Cylindrical Roller 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
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
NNCL type has three flanges on the inner ring; NNCF type allows axial location in one direction. NNC type has a split outer ring. NNF type has PUR contact seals and is available either pre-greased or open type.
Features
- Non-separable type with oil groove and oil holes in the outer ring
- NNF type with PUR contact seals
- Outer ring width of NNF type is 1 mm narrower than inner ring width
Applications
- Applications subject to bending moments, such as rope sheaves
- Oil-lubricated applications
FAQ
- Q. What applications can the NNF type double-row full complement cylindrical roller bearing be used for?
- A. The NNF type has PUR contact seals and is used for axial location in both directions. It is suitable for applications subject to bending moments, such as rope sheaves.
- Q. What are the differences between the NNCL, NNCF, and NNC types?
- A. The NNCL type has three flanges on the inner ring. The NNCF type allows axial location in one direction. The NNC type has a split outer ring.
- Q. Can the NNF type be purchased pre-greased?
- A. The NNF type is available either pre-greased or as an open type.
- Q. Can the double-row full complement cylindrical roller bearing be used with oil lubrication?
- A. It is available for oil-lubricated applications. The outer ring has an oil groove and oil holes.
- Q. What is the difference between the outer ring width and inner ring width of the NNF type?
- A. The outer ring width of the NNF type is 1 mm narrower than the inner ring width.
Written by AI based on the content of the source documents.
Source documents
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Catalog
SKF 円筒ころ軸受 (カタログ抜粋)
106 pages Open page 14
Found on: https://azuma-eg.com/catalogue/
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