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Four-Point Contact Ball Bearings SKF Explorer Bearings

QJ 2 系・QJ 3 系 (位置決め溝付き) / SKF (Official website) / Listed on page 61 of the document

Four-point contact ball bearing series with bore diameters of 100 to 200 mm. SKF Explorer bearings, including types with locating slots. Can support axial loads in both directions.

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Four-Point Contact Ball Bearings SKF Explorer Bearings on page 61 of SKF "アンギュラ玉軸受 (SKF 製品カタログ抜粋)"
Source: SKF「アンギュラ玉軸受 (SKF 製品カタログ抜粋)」page 61
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Specifications

Inner diameter d 100 to 200 mm
Outer diameter D 180〜400 mm
Width B 34〜78 mm
Basic dynamic load rating Cr 236〜702 kN
Basic static load rating C0r 265〜1160 kN
Fatigue Load Limit Pu 9.5〜28.5 kN
Reference rotational speed 1700〜4500 r/min
Limiting speed (grease lubrication) 2800〜6300 r/min
Mass 4.05〜49 kg

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (Four-Point Contact Ball Bearings SKF Explorer Bearings).

  1. 1. Bore and housing bore dimensions

    This product: Inner diameter d 100 to 200 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 236〜702 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

    This product: Basic static load rating C0r 265〜1160 kN

    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

    This product: Limiting speed (grease lubrication) 2800〜6300 r/min

    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

Basic design is SKF Explorer bearings, with bore diameter d = 100 to 200 mm, outside diameter D = 180 to 400 mm, and width B = 34 to 78 mm. Dynamic and static load ratings, limiting speed and reference speed, mass, and dimensions of bearings with locating slots and related mounting dimensions (shoulder diameter, corner radius, etc.) are listed. The suffix N2MA in the type number indicates a bearing with locating slots.

Features

  • SKF Explorer bearings
  • Types with locating slots available

FAQ

Q. What are the ranges of bore diameter, outside diameter, and width for the QJ 2 series and QJ 3 series four-point contact ball bearings?
A. The bore diameter d is 100 to 200 mm, the outside diameter D is 180 to 400 mm, and the width B is 34 to 78 mm.
Q. In which load directions can SKF Explorer four-point contact ball bearings support loads?
A. They can support axial loads in both directions.
Q. Where in the type number should I check to select a bearing with locating slots?
A. The suffix N2MA at the end of the type number indicates a bearing with locating slots. Dimensions of bearings with locating slots and related mounting dimensions (shoulder diameter, corner radius, etc.) are listed.
Q. What are the ranges of basic dynamic load rating and basic static load rating for the QJ 2 series and QJ 3 series?
A. The basic dynamic load rating Cr is 236 to 702 kN, and the basic static load rating C0r is 265 to 1160 kN.
Q. What are the reference speed and limiting speed (grease lubrication) for the QJ 2 series and QJ 3 series?
A. The reference speed is 1700 to 4500 r/min, and the limiting speed (grease lubrication) is 2800 to 6300 r/min.

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

Source documents

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