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High Load Capacity Cylindrical Roller Bearing

Model NCF ..ECJB, NJF ..ECJA, NUH ..ECMH / 高負荷容量 / SKF (Official website) / Listed on page 10 of the document

A cylindrical roller bearing combining the high load capacity of full complement roller bearings with the high-speed rotation performance of cage-equipped bearings. Suitable for industrial gearboxes, wind turbines and similar applications.

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High Load Capacity Cylindrical Roller Bearing on page 10 of SKF "SKF 円筒ころ軸受 (カタログ抜粋)"
Source: SKF「SKF 円筒ころ軸受 (カタログ抜粋)」page 10
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Specifications

Inner diameter d 100〜170 mm
Outer diameter D 180〜360 mm
Basic dynamic load rating Cr 46〜120 kN

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (NCF ..ECJB, NJF ..ECJA, NUH ..ECMH).

  1. 1. Bore and housing bore dimensions

    This product: Inner diameter d 100〜170 mm

    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.

  2. 2. Dynamic load rating based on life calculation

    This product: Basic dynamic load rating Cr 46〜120 kN

    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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

About Rolling Bearings and all products

Description

A metal window-type cage reduces the roller spacing, allowing additional rollers to be arranged. Inner ring guided and outer ring guided cage versions are available. Black oxide treatment (suffix L4B) reduces the risk of wear during running-in.

Features

  • Load capacity equivalent to full complement roller bearings
  • High-speed rotation capability due to cage design
  • Black oxide treatment on raceway rollers (L4B)
  • Separable type (NUH ..ECMH) available

Applications

  • Industrial gearboxes
  • Wind turbine gearboxes
  • Mining equipment

FAQ

Q. What applications are the NCF ..ECJB, NJF ..ECJA and NUH ..ECMH high load capacity cylindrical roller bearings suited for?
A. They are suited for industrial gearboxes, wind turbine gearboxes and mining equipment.
Q. Do the NCF ..ECJB, NJF ..ECJA and NUH ..ECMH high load capacity cylindrical roller bearings offer both load capacity and high-speed rotation performance?
A. Yes. They are cylindrical roller bearings that combine the load capacity of full complement roller bearings with high-speed rotation capability due to their cage design.
Q. What are the dimension and basic dynamic load rating ranges of the NCF ..ECJB, NJF ..ECJA and NUH ..ECMH high load capacity cylindrical roller bearings?
A. Bore diameter d is 100 to 170 mm, outside diameter D is 180 to 360 mm, and basic dynamic load rating Cr is 46 to 120 kN.
Q. What is the purpose of the black oxide treatment (L4B) on the NCF ..ECJB, NJF ..ECJA and NUH ..ECMH high load capacity cylindrical roller bearings?
A. Black oxide treatment (suffix L4B) is applied to the raceway rollers to reduce the risk of wear during running-in.
Q. Are there variations in separable design or cage type for the NCF ..ECJB, NJF ..ECJA and NUH ..ECMH high load capacity cylindrical roller bearings?
A. A separable type (NUH ..ECMH) is available. Two cage guidance types are offered, inner ring guided and outer ring guided, and the cage is of the metal window type.

Written by AI based on the content of the source documents.

Source documents

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