JHS520 Roll Neck Bearing (Standard / Premium)
JHS520 / JTEKT Corporation (Official website) / Listed on page 5 of the document
Four-row tapered roller bearing for rolling mill roll necks. Achieves long life and high corrosion resistance through case-hardening steel and special heat treatment.
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Specifications
| Service Life (In-House Bench Test, Standard) | Approx. 4x |
|---|---|
| Service Life (In-House Bench Test, Premium) | Approx. 7x |
| Rust resistance (standard) | Approx. 2.2x |
| Rust resistance (premium) | Approx. 3.8x |
| Speed performance (at same temperature rise) | 2x |
| Load performance (at same temperature rise) | 4x |
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (JHS520 Roll Neck Bearing (Standard / Premium)).
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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
Newly developed case-hardening steel is used for the raceways to improve rolling life, toughness, and corrosion resistance. The Premium version adds special heat treatment to further enhance rolling fatigue life and corrosion resistance.
Features
- Adoption of newly developed case-hardening steel
- Premium version improves corrosion resistance through special heat treatment
- Low temperature rise technology (applied to thrust bearings)
Applications
- Rolling mills
FAQ
- Q. How much difference is there in life between the Standard and Premium versions of the JHS520 Roll Neck Bearing?
- A. In in-house bench tests, the Standard version achieves approximately 4 times the life and the Premium version approximately 7 times. The Premium version adds special heat treatment to further enhance rolling fatigue life and corrosion resistance.
- Q. What is the rust resistance of the JHS520 Roll Neck Bearing?
- A. Rust resistance is approximately 2.2 times higher for the Standard version and approximately 3.8 times higher for the Premium version. The Premium version improves corrosion resistance through special heat treatment.
- Q. How has the speed and load performance of the JHS520 Roll Neck Bearing improved?
- A. At the same temperature rise, speed performance is 2 times higher and load performance is 4 times higher. Low temperature rise technology is applied to thrust bearings.
- Q. What applications can the JHS520 Roll Neck Bearing be used for?
- A. It is a four-row tapered roller bearing for roll necks in rolling mills.
Written by AI based on the content of the source documents.
Source documents
- Catalog 製鉄・圧延設備用 高性能商品シリーズ Open page 5
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