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SKF High-Temperature Deep Groove Ball Bearing VA228

VA228 / SKF (Official website)

A high-temperature deep groove ball bearing usable up to 350°C. Graphite lubrication eliminates the need for relubrication, making it suitable for high-temperature environments with low-speed and oscillating applications.

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Specifications

Maximum Operating Temperature 350 °C
Permissible rotational speed 9000/d (d = mean bearing diameter) r/min
Break-In Operation Not required

VA228 model comparison

Compare 2 models in the same series by specification.

Model Maximum Operating Temperature Break-In Operation
SKF高温用インサート軸受・玉軸受ユニット VA228 350 °C Not required
SKF高温用深溝玉軸受 VA228 This product 350 °C Not required

How to choose Deep Groove Ball Bearings

Points to check when selecting, with the values for this product (SKF High-Temperature Deep Groove Ball Bearing VA228).

  1. 1. Main dimensions to suit shaft and housing

    Select the bore diameter d to match the shaft diameter, the outside diameter D to match the housing bore, and the width B to suit the installation space. The listed products cover a wide range of bore diameters from 0.6 to 1420 mm, and even at the same bore diameter there are dimension series with different outside diameters and widths. Since load capacity and mass change with the dimension series, confirm the three dimensions in combination.

  2. 2. Basic dynamic load rating for life calculation

    The basic dynamic load rating Cr is the reference value for calculating rolling fatigue life, and life is estimated from the ratio of the actual applied load to Cr. For high loads or when long life is required, select a bearing with a larger Cr. Bearings made of special materials may have lower ratings than steel bearings of the same dimensions, so confirm life under the operating conditions.

  3. 3. Check static and shock loads against static rating

    The basic static load rating C0r is the guideline load at which permanent deformation does not occur, applicable when stationary, rotating at low speed, or subjected to shock loads. For applications with oscillating motion or large loads while stopped, select with emphasis on the ratio to C0r (static safety factor) rather than the dynamic rating.

  4. 4. Internal clearance to suit fit and temperature

    Radial internal clearance decreases during operation due to interference fits and temperature differences between the inner and outer rings. Clearances larger than standard, such as C3, are used in applications where the inner ring tends to expand, such as motors or high-temperature environments. Clearance that is too small leads to heat generation and seizure, so determine the class from the fit and operating temperature.

  5. 5. Materials and lubrication suited to the environment

    Stainless steel or ceramics (silicon nitride, zirconia, silicon carbide) are used in water or chemical solutions, while solid lubricants such as graphite or fluorine-based solids and fluorine grease are used in high-temperature, vacuum or clean environments. Listed products have maximum operating temperatures of 250 to 350°C, so select the material and lubrication method based on temperature, atmosphere and dust-generation requirements.

  6. 6. Check speed limits and electrical corrosion countermeasures

    Confirm that the limiting speed and reference speed exceed the operating speed. In equipment where shaft current flows, such as inverter-driven motors, hybrid bearings with insulating-coated or ceramic balls can prevent electrolytic corrosion. Ceramic balls are lighter than steel balls, so the effect of centrifugal force is reduced even at high speeds.

This guide was written by AI based on the listed products' documents and specification items.

About Deep Groove Ball Bearings and all products

Description

Features a non-split graphite cage, radial internal clearance adjusted for high temperatures, and shields on both sides. Manganese phosphate treatment eliminates the need for running-in. Interchangeable with standard bearings of ISO boundary dimensions.

Features

  • No relubrication required due to graphite lubrication
  • Maximum operating temperature of 350°C
  • Shields on both sides (2Z)
  • No running-in required due to manganese phosphate treatment
  • Same boundary dimensions as standard bearings

Applications

  • Steel mill and steel plate cooling beds
  • Food and beverage processing
  • High-temperature ovens
  • Low-speed and oscillating machinery

FAQ

Q. What is the maximum operating temperature of the SKF VA228, and does it require relubrication in high-temperature environments?
A. It can be used at up to 350°C. Graphite lubrication eliminates the need for relubrication.
Q. Can the SKF VA228 be used for low-speed and oscillating applications or high-temperature ovens?
A. It is suitable for low-speed and oscillating applications in high-temperature environments. Listed applications include steel mill and steel plate cooling beds, food and beverage processing, high-temperature ovens, and low-speed and oscillating machinery.
Q. Can the SKF VA228 replace a standard deep groove ball bearing?
A. Yes, it is interchangeable with standard bearings of ISO boundary dimensions. It has the same boundary dimensions as standard bearings.
Q. What is the permissible rotational speed of the SKF VA228, and is running-in required before use?
A. The permissible speed is 9000/d (d = mean bearing diameter) r/min. Running-in is not required due to manganese phosphate treatment.
Q. What is the structure of the SKF VA228, and how are the seals configured?
A. It features a non-split graphite cage, radial internal clearance adjusted for high temperatures, and shields on both sides. It has shields on both sides (2Z).

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

Source documents

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