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Spherical Roller Bearing

SKF (Official website) / Listed on page 2 of the document

Self-aligning heavy-duty roller bearing with two rows of rollers and a common spherical raceway. Can carry radial and axial loads in both directions and is less affected by shaft misalignment.

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Spherical Roller Bearing on page 2 of SKF "SKF 球面ころ軸受 (製品データ表 8章抜粋)"
Source: SKF「SKF 球面ころ軸受 (製品データ表 8章抜粋)」page 2
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Specifications

Internal clearance Normal, C3 (C2, C4, C5 available upon stock check)
Dimensional Standard ISO 15 (main dimensions)
Accuracy grade Normal (P5 rotational accuracy available on request with C08 suffix)
Seal material NBR (CS), HNBR (CS5), FKM (CS2)
Recommended grease for sealed bearings SKF LGEP 2 (standard), LGHB 2 (on request)
Maximum heating temperature during mounting of sealed bearings 80 °C
Reduction of friction moment for E2 bearings 30 or more %
Permissible Acceleration for Vibration Applications Applicable to oil-lubricated bearings (values expressed as multiples of g)

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (Spherical Roller 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

    This product: Accuracy grade Normal (P5 rotational accuracy available on request with C08 suffix)

    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

Symmetrical rollers and tight tolerances distribute the load evenly and extend the practical service life. Equipped with a pressed steel cage, self-guiding rollers and guide rings, and available in basic designs such as CC, CA and E types. The standard bore is cylindrical, and tapered bores (taper ratio 1:12 or 1:30) are also available for certain series. Available with seals, for vibration applications, and in SKF Explorer and E2 performance classes.

Features

  • Self-aligning
  • Handles heavy radial and heavy axial loads
  • Symmetrical rollers
  • Metal cage
  • Basic designs CC, CA and E types
  • Sealed bearings available in the lineup
  • C4 clearance is standard for vibration applications

Applications

  • Heavy-duty machinery
  • Vibrating screens
  • Paper machines
  • Printing presses
  • Railway rolling stock
  • Continuous casting equipment

FAQ

Q. What internal clearances are available for spherical roller bearings?
A. Normal internal clearance is C3. C2, C4 and C5 are available upon stock confirmation.
Q. What bore shapes are available for spherical roller bearings?
A. The standard bore is cylindrical. Tapered bores (taper ratio 1:12 or 1:30) are also available for certain series.
Q. What seal materials are available for spherical roller bearings?
A. NBR (CS), HNBR (CS5) and FKM (CS2) are available.
Q. What is the recommended grease and maximum heating temperature for sealed spherical roller bearings?
A. The recommended grease is SKF LGEP 2 (standard), and LGHB 2 is available on request. The maximum heating temperature during mounting is 80 °C.
Q. Can spherical roller bearings be used in vibration applications?
A. Yes, vibration-application versions are available, with C4 clearance as standard. The permissible acceleration applies to oil-lubricated bearings and is expressed as a multiple of g.

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

Source documents

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