High Load Capacity Cylindrical Roller Bearings NCF/NUH ECJB・ECMH
NCF..ECJB / NUH..ECMH (d 180~240 mm) / SKF (Official website)
High load capacity cylindrical roller bearings with bore diameters of 180 to 240 mm. Flanged design with large dynamic and static load capacity. Some are SKF Explorer bearings.
Last verified: (date the content was verified against the source document)
Specifications
| Inner diameter d | 180~240 mm |
|---|---|
| Outer diameter D | 320~500 mm |
| Width B | 86~155 mm |
| Basic dynamic load rating Cr | 1 720~3 150 kN |
| Basic static load rating C0r | 2 400~4 000 kN |
| Mass | 30~143 kg |
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (High Load Capacity Cylindrical Roller Bearings NCF/NUH ECJB・ECMH).
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1. Bore and housing bore dimensions
This product: Inner diameter d 180~240 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
This product: Basic dynamic load rating Cr 1 720~3 150 kNThe 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
This product: Basic static load rating C0r 2 400~4 000 kNThe 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
Series of NCF and NUH types covering bore diameters of 180 to 240 mm and outside diameters of 320 to 500 mm. PEX specification has different basic load ratings and limiting speeds. Mounting dimensions and calculation factors are also provided.
Features
- High load capacity design
- Some are SKF Explorer bearings
- PEX specification available
FAQ
- Q. What are the bore and outside diameter ranges for NCF/NUH ECJB・ECMH type bearings?
- A. Bore diameter d is 180 to 240 mm and outside diameter D is 320 to 500 mm.
- Q. What are the width and mass of NCF/NUH ECJB・ECMH type bearings?
- A. Width B is 86 to 155 mm and mass is 30 to 143 kg.
- Q. What are the basic load ratings of NCF/NUH ECJB・ECMH type bearings?
- A. Basic dynamic load rating Cr is 1 720 to 3 150 kN and basic static load rating C0r is 2 400 to 4 000 kN.
- Q. What differs in the PEX specification of NCF/NUH ECJB・ECMH type bearings?
- A. The PEX specification has different basic load ratings and limiting speeds.
- Q. What applications and features do NCF/NUH ECJB・ECMH type bearings have?
- A. They are flanged high load capacity cylindrical roller bearings with large dynamic and static load capacity. Some are SKF Explorer bearings.
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 Found on: https://azuma-eg.com/catalogue/
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