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Self-Aligning Ball Bearing

12系列、13系列、22系列、23系列、130系列、139系列 / SKF (Official website) / Listed on page 2 of the document

A rolling bearing with two rows of balls and a common spherical outer ring, less affected by shaft misalignment. Low friction keeps the temperature rise limited at high rotational speeds.

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Self-Aligning Ball Bearing on page 2 of SKF "SKF 自動調心玉軸受 製品カタログ(設計およびバリエーション・軸受データ)"
Source: SKF「SKF 自動調心玉軸受 製品カタログ(設計およびバリエーション・軸受データ)」page 2
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Specifications

Operating Temperature Range -40~+100 °C
Short-time permissible temperature of NBR seal for sealed bearings 120 °C
Thermal stability of raceway and balls 120 °C
Taper hole taper ratio 1:12
Internal clearance Normal, C3

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (Self-Aligning Ball Bearing).

  1. 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.

  2. 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.

  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

    This product: Operating Temperature Range -40~+100 °C

    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

Available in the basic cylindrical bore type and, depending on dimensions, the tapered bore type with taper ratio 1:12 indicated by the suffix K. Wide inner ring types are positioned on the shaft with pins or setscrews. Sealed types are maintenance-free, with NBR seals on both sides and sealed grease. Cages are available in pressed steel, PA66 resin and brass, selected according to series and dimensions.

Features

  • Spherical outer ring with two rows of balls accommodates misalignment
  • Low friction results in a small temperature rise at high rotational speeds
  • Thermal stability up to 120 °C through special heat treatment
  • Maintenance-free sealed types with contact seals on both sides
  • Wide inner ring types allow easy mounting and dismounting

Applications

  • Paper manufacturing industry
  • Various machines where low friction is a priority

FAQ

Q. What is the operating temperature range of the self-aligning ball bearing (without model number)?
A. The operating temperature range is -40 to +100 °C. The NBR seals of sealed bearings are permissible up to 120 °C for short periods. The thermal stability of the raceways and balls is 120 °C.
Q. Is the self-aligning ball bearing suitable where shaft misalignment occurs?
A. Yes. It has two rows of balls and a common spherical outer ring, so it is less affected by shaft misalignment. The spherical outer ring of the two-row ball design accommodates misalignment.
Q. Do sealed self-aligning ball bearings require maintenance?
A. No. With NBR seals on both sides and sealed grease, they are maintenance-free.
Q. How are wide inner ring self-aligning ball bearings mounted on the shaft?
A. They are positioned on the shaft with pins or setscrews. Mounting and dismounting are easy.
Q. How should a tapered bore self-aligning ball bearing be selected?
A. Depending on dimensions, tapered bore types with taper ratio 1:12, indicated by the suffix K, are available. Basic cylindrical bore types are also available.

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

Source documents

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