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Self-aligning Spherical Roller Bearings 20*52*15 - High Performance from China Suppliers & Factory

Structural Features of Spherical Roller Bearings

Our spherical roller bearings consist of two rows of symmetrical spherical rollers and a common outer spherical raceway. The inner ring is designed with two raceways, which are inclined at a specific angle relative to the bearing axis, enhancing performance and durability.

Known for their exceptional self-aligning capabilities, these bearings are ideal for applications where shaft misalignment may occur. Even when the installation alignment deviates by 1°-2.5° due to shaft bending or misalignment between the inner and outer ring axes, our spherical roller bearings function seamlessly. As leading suppliers and factory direct manufacturers in China, we ensure high-quality products that meet your operational needs.

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    Product Details

    Bearing Detail

    Item No. 21304
    Bearing Type Self aligning roller bearing
    Material Chrome steel GCr15
    Precision P0, P2, P5, P6, P4
    Clearance C0, C2, C3, C4, C5
    Row number two
    Inner diameter 20 mm
    Outer diameter 52 mm
    Width 15 mm
    Load Radial Load
    Weight 0.21 kg
    Basic rated dynamic load 29300 N
    Basic rated static load 26900 N
    Grease lubrication limit speed 6300 r/min
    Oil lubrication limit speed 8200 r/min
    Brand JITO or OEM
    Lubrication Grease or Oil
    Ball Bearings Feature • Long-life with high quality
    • Low-noise with strict controlling the quality of JITO bearing
    • High-load by the advanced high-technical design
    • Competitive price, which has the most valuable
    • OEM service offered, to meet the customers requirements
    Application Automobiles, rolling mills, mining, metallurgy, plastic machinery and other industries
    Bearing Package Pallet, wooden case, commercial packaging or as customers' requirement

    Performance Parameters

    Load Capacity

    It can withstand large radial loads and bidirectional axial loads, and can adapt to heavy load and impact load conditions. The Cr rated dynamic load is 29,300 N, and the Cr rated static load is 26,900 N.

    Limiting Speed

    The limiting speed of different brands and specific models is slightly different. The limiting speed is 6,300 rpm when Grease lubrication is used, and 8,200 rpm when Oil lubrication is used.

    Features

    Self-aligning Function

    Can withstand misalignment and shaft deflection with almost no increase in friction or temperature.

    High Load Capacity

    Can withstand large axial loads in both directions, suitable for heavy-duty applications.

    Low Friction & Long Life

    The design has the characteristics of replenishing lubrication, which can reduce friction, extend service life and increase wear resistance.

    Application Fields

    Industrial Machinery

    Widely used in rock drills, corrosion-resistant pumps, ceramic building materials processing equipment, mixers, compression molding machines, and other equipment.

    Automotive Field

    Used for crucial transmission components, drive shafts, and support assemblies across various vehicle categories.

    Other Industries

    Also effectively used in forestry machinery, reaction equipment, color printing machines, mining element analyzers, coating and dust removal equipment, etc.

    Common Model Suffixes & Meanings

    W33

    Indicates lubrication grooves and three lubrication holes on the outer ring of the bearing.

    K

    Indicates a tapered inner bore (e.g., 21304K indicates spherical roller bearing with tapered bore).

    CA

    Indicates a precision machined one-piece brass solid cage.

    CC

    Indicates a stamped steel cage configuration with guide ring.

    Product Parameters

    Bearing Numbers Boundary Dimensions (mm) Basic Load Ratings (kN) Limiting Speeds (r/min) Weight
    Cylindrical Bore Tapered Bore d D B r Dynamic Cr Static Cor Grease Oil kg (approx.)
    21304CA 21304CAK 20 52 15 1.1 31.7 32.1 6000 7500 0.175
    21304CTN1 21304KCTN1 52 15 1.1 35.8 35.2 6000 7500 0.161
    22205CC 22205CCK 25 52 18 1 40 42 8000 10000 0.177
    22205CA 22205CAK 52 18 1 40 42 8000 10000 0.177
    22205CTN1 22205KCTN1 52 18 1 42.2 45 8000 10000 0.178
    21305CA 21305CAK 62 17 1.1 42.7 45.5 5300 6700 0.277
    21305CTN1 21305KCTN1 62 17 1.1 42.5 45.8 5300 6700 0.258
    22206MB 22206MBK 30 62 20 1 34.5 39.3 5300 6700 0.29
    22206CA 22206CAK 62 20 1 53.4 58.5 6300 8000 0.3
    22206CC 22206CCK 62 20 1 53.4 58.5 6700 8500 0.283
    22206CTN1 22206KCTN1 62 20 1 58.5 61.3 6700 8500 0.271
    21306CA 21306CAK 72 19 1.1 57.5 63.9 4500 6000 0.412
    21306CTN1 21306KCTN1 72 19 1.1 63.8 65.4 4500 6000 0.391
    22207MB 22207MBK 35 72 23 1.1 46.6 61.3 4800 6000 0.43
    22207CA 22207CAK 72 23 1.1 68.5 78.8 5300 6700 0.45
    22207CC 22207CCK 72 23 1.1 70.5 81.4 5600 7000 0.437
    22207CTN1 22207KCTN1 72 23 1.1 78.5 87 5600 7000 0.428
    21307CA 21307CAK 80 21 1.5 65.4 75.4 4000 5300 0.542
    21307CTN1 21307KCTN1 80 21 1.5 74.4 77.7 4000 5300 0.507
    22208MB 22208MBK 40 80 23 1.1 51.3 70.6 4500 5600 0.55
    22208CA 22208CAK 80 23 1.1 80.9 93.5 5000 6000 0.54
    22208CC 22208CCK 80 23 1.1 80.9 93.5 5000 6300 0.524
    22208CTN1 22208KCTN1 80 23 1.1 95.3 103 5000 6300 0.524
    21308CA 21308CAK 80 23 1.1 88.8 99 3600 4500 0.75
    21308CC 21308CCK 80 23 1.1 88.8 99 3600 4500 0.743
    21308CTN1 21308KCTN1 80 23 1.1 93.9 102 3600 4500 0.717
    22308MB 22308MBK 90 33 1.5 75.7 93.2 4000 5000 1.03
    22308CA 22308CAK 90 33 1.5 123.6 142.1 4300 5300 1
    22308CC 22308CCK 90 33 1.5 123.6 142.1 4500 6000 1.02
    22308CTN1 22308KCTN1 90 33 1.5 133.9 152.4 4500 6000 1.02
    22209MB 22209MBK 45 85 23 1.1 53.8 75.4 4000 5000 0.59
    22209CA 22209CAK 85 23 1.1 84.5 100.4 4500 5600 0.58
    22209CC 22209CCK 85 23 1.1 82.9 98 4500 6000 0.571
    22209CTN1 22209KCTN1 85 23 1.1 97.1 105.1 4500 6000 0.555
    21309CA 21309CAK 100 25 1.5 105.7 118.4 3200 4000 1.02
    21309CC 21309CCK 100 25 1.5 105.7 118.4 3200 4000 1
    21309CTN1 21309KCTN1 100 25 1.5 111.2 123.6 3200 4000 0.949
    22309MB 22309MBK 100 36 1.5 111.2 144.2 3600 4500 1.4
    22309CA 22309CAK 100 36 1.5 146.3 175.1 3800 4800 1.38
    22309CC 22309CCK 100 36 1.5 146.3 175.1 4000 5300 1.37
    22309CTN1 22309KCTN1 100 36 1.5 164.8 190.5 4000 5300 1.39
    22210MB 22210MBK 50 90 23 1.1 53.8 75.4 3800 4800 0.87
    22210CA 22210CAK 90 23 1.1 87 108.1 4000 5000 0.62
    22210CC 22210CCK 90 23 1.1 86.3 105.1 4300 5300 0.614
    22210CTN1 22210KCTN1 90 23 1.1 99.4 113.3 4300 5300 0.596
    21310CA 21310CAK 110 27 2 123.6 144.2 2800 3800 1.3
    21310CC 21310CCK 110 27 2 128.7 144.2 2800 3800 1.3
    21310CTN1 21310KCTN1 110 27 2 128.7 144.2 2800 3800 1.22
    22310MB 22310MBK 110 40 2 131.8 175.1 3400 4300 1.9
    22310CA 22310CAK 110 40 2 180.3 216.3 3400 4300 1.85
    22310CC 22310CCK 110 40 2 180.3 216.3 3800 4800 1.79
    22310CTN1 22310KCTN1 110 40 2 197.7 234.8 3800 4800 1.84

    Frequently Asked Questions (FAQ)

    Q: What are the core advantages of self-aligning roller bearings like 21304?

    They are designed to accommodate angular misalignment and shaft deflection with minimal friction and heat build-up, making them exceptionally reliable in heavy-duty machinery.

    Q: What is the difference between CA and CC cage types?

    "CA" designates a robust, precision-machined solid brass cage offering extreme durability, whereas "CC" features a stamped pressed steel cage design with guide rings for optimized roller guidance.

    Q: What does the "W33" suffix stand for on spherical roller bearings?

    The "W33" designation indicates an annular lubrication groove and three oil discharge holes machined on the outer ring, allowing efficient re-lubrication directly into the bearing interior.

    Q: What does the "K" code signify in bearing part numbers?

    The "K" suffix indicates a tapered bore (1:12 or 1:30 taper ratio), allowing the bearing to be mounted directly onto tapered shaft journals or using adapter/withdrawal sleeves.

    Q: How does lubrication method affect the limiting speed of bearing 21304?

    Under grease lubrication, the limiting speed is rated up to 6,300 rpm, whereas with proper oil lubrication, thermal dissipation improves to achieve limiting speeds up to 8,200 rpm.

    Q: Can custom OEM precision classes and packaging be provided?

    Yes, precision grades ranging from standard P0 to high-precision P6, P5, P4, and P2 are available alongside tailored OEM branding and customized industrial packaging solutions.

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