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China Self-aligning Spherical Roller Bearings 20*52*15 - Quality Products from Reliable Suppliers and Factory

Structural Features of Spherical Roller Bearings

Our spherical roller bearings are designed with two rows of symmetrical spherical rollers and a common outer spherical raceway. The innovative inner ring features two raceways, positioned at a specific angle to the bearing axis, enhancing overall performance.

Known for their excellent self-aligning capabilities, these bearings can efficiently accommodate shaft misalignments or mounting errors. Even when the angle deviation between the inner and outer ring axes falls within the range of 1°-2.5°, our bearings continue to operate smoothly, making them a reliable choice for various applications.

As a leading manufacturer in China, we pride ourselves on providing high-quality spherical roller bearings. Our factory utilizes advanced technology and materials, ensuring that we meet the demands of our customers. Partner with top suppliers for your bearing needs and experience the difference in quality and performance.

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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 29300N, and the Cr rated static load is 26900N.

    Limiting Speed

    The limiting speed of different brands and specific models is slightly different. The limiting speed is 6300rpm when Grease lubrication is used, and 8200rpm when Oil lubrication is used.

    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 some transmission and support parts of automobiles.

    Other Industries

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

    Common Model Suffixes and Meanings

    W33 Indicates that there are lubrication grooves and three lubrication holes on the outer ring of the bearing.
    K Indicates that the inner hole of the bearing is a tapered hole. For example, 21304K indicates a spherical roller bearing with a tapered inner hole.
    CA, CC CA indicates a brass solid cage, and CC indicates a stamped steel cage.

    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.

    Product Parameter

    Bearing Numbers Boundary Dimensions (mm) Basic Load Ratings (KN) Limiting Speeds (r/min) Weight (approx. kg)
    d D B r Dynamic Cr Static Cor Grease Oil
    Cylindrical Bore Tapered Bore
    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
    22211MB 22211MBK 55 100 25 1.5 61.8 89.8 3400 4300 0.86
    22211CA 22211CAK 100 25 1.5 105.1 128.8 3600 4500 0.84
    22211CC 22211CCK 100 25 1.5 105.1 128.8 3800 5000 0.847
    22211CTN1 22211KCTN1 100 25 1.5 121.5 144.2 3800 5000 0.823
    21311CA 21311CAK 120 29 2 146.3 175.1 2600 3400 1.65
    21311CC 21311CCK 120 29 2 146.3 175.1 2600 3400 1.65
    21311CTN1 21311KCTN1 120 29 2 149.3 170 2600 3400 1.57
    22311MB 22311MBK 120 43 2 159.6 203.9 3000 3800 2.4
    22311CA 22311CAK 120 43 2 214.2 257.5 3000 3800 2.35
    22311CC 22311CCK 120 43 2 216.3 259.6 3400 4300 2.31
    22311CTN1 22311KCTN1 120 43 2 231.7 272.9 3400 4300 2.32
    22212MB 22212MBK 60 110 28 1.5 84.3 125.7 3200 4000 1.22
    22212CA 22212CAK 110 28 1.5 125.7 159.7 3200 4000 1.2
    22212CC 22212CCK 110 28 1.5 125.7 159.7 3600 4500 1.15
    22212CTN1 22212KCTN1 110 28 1.5 154.5 190.5 3600 4500 1.14
    21312CA 21312CAK 130 31 2.1 166.9 200.9 2400 3200 2.08
    21312CC 21312CCK 130 31 2.1 166.9 200.9 2400 3200 2.08
    21312CTN1 21312KCTN1 130 31 2.1 166.9 200.9 2400 3200 1.96
    22312MB 22312MBK 130 46 2.1 173 231.8 2800 3600 3
    22312CA 22312CAK 130 46 2.1 245.1 293.6 2800 3600 2.95
    22312CC 22312CCK 130 46 2.1 249.3 300.8 3200 4000 2.88
    22312CTN1 22312KCTN1 130 46 2.1 262 312 3200 4000 2.96
    22213MB 22213MBK 65 120 31 1.5 91.2 131.8 2800 3600 1.63
    22213CA 22213CAK 120 31 1.5 154.5 200.8 2800 3600 1.6
    22213CC 22213CCK 120 31 1.5 154.5 200.8 3200 4000 1.54
    22213CTN1 22213KCTN1 120 31 1.5 172 212 3200 4000 1.53
    21313CA 21313CAK 140 33 2.1 187.5 234.8 2200 3000 2.57
    21313CC 21313CCK 140 33 2.1 187.5 234.8 2200 3000 2.57
    21313CTN1 21313KCTN1 140 33 2.1 198 235 2200 3000 2.45
    22313MB 22313MBK 140 48 2.1 193.6 259.6 2400 3200 3.6
    22313CA 22313CAK 140 48 2.1 267.8 324.4 2400 3200 3.55
    22313CC 22313CCK 140 48 2.1 372.9 329.6 3000 3800 3.47
    22313CTN1 22313KCTN1 140 48 2.1 295 355 3000 3800 3.57
    22214MB 22214MBK 70 125 31 1.5 97.9 146.3 2600 3400 1.66
    22214CA 22214CAK 125 31 1.5 162.7 211.2 2600 3400 1.7
    22214CC 22214CCK 125 31 1.5 154.5 200.8 3000 3800 1.6
    22214CTN1 22214KCTN1 125 31 1.5 180 225 3000 3800 1.6
    21314CA 21314CAK 150 35 2.1 218.4 276 2000 2800 3.11
    21314CC 21314CCK 150 35 2.1 218.4 276 2000 2800 3.11
    21314CTN1 21314KCTN1 150 35 2.1 220 265 2000 2800 2.97
    22314MB 22314MBK 150 51 2.1 236.9 324.5 2200 3000 4.4
    22314CA 22314CAK 150 51 2.1 300.8 372.9 2200 3000 4.4
    22314CC 22314CCK 150 51 2.1 321.4 406.9 2800 3400 4.34
    22314CTN1 22314KCTN1 150 51 2.1 332 405 2800 3400 4.35
    22215MB 22215MBK 75 130 31 1.5 97.85 146.3 2400 3200 1.75
    22215CA 22215CAK 130 31 1.5 166.9 221.5 2400 3200 1.8
    22215CC 22215CCK 130 31 1.5 166.9 221.5 3000 3800 1.69
    22215CTN1 22215KCTN1 130 31 1.5 180 232 3000 3800 1.67
    21315CA 21315CAK 160 37 2.1 245.1 311.1 1900 2600 3.76
    21315CC 21315CCK 160 37 2.1 245.1 311.1 1900 2600 3.76
    21315CTN1 21315KCTN1 160 37 2.1 245.1 311.1 1900 2600 3.63
    22315MB 22315MBK 160 55 2.1 269.9 399.6 2000 2800 5.4
    22315CA 22315CAK 160 55 2.1 352.3 451.1 2000 2800 5.25
    22315CC 22315CCK 160 55 2.1 358.4 461.4 2600 3200 5.28
    22315CTN1 22315KCTN1 160 55 2.1 380 470 2600 3200 5.33
    22216MB 22216MBK 80 140 33 2 118.5 185.4 2200 3000 2.2
    22216CA 22216CAK 140 33 2 180.3 245.1 2200 3000 2.2
    22216CC 22216CCK 140 33 2 180.3 242.1 2800 3400 2.13
    22216CTN1 22216KCTN1 140 33 2 212 275 2800 3400 2.09
    21316CA 21316CAK 170 39 2.1 267.8 358.6 1800 2400 4.47
    21316CC 21316CCK 170 39 2.1 267.8 358.6 1800 2400 4.47
    21316CTN1 21316KCTN1 170 39 2.1 280 350 1800 2400 4.33
    22316MB 22316MBK 170 58 2.1 296.6 417.2 1900 2600 6.4
    22316CA 22316CAK 170 58 2.1 396.6 512.9 1900 2600 6.39
    22316CC 22316CCK 170 58 2.1 403.8 523.2 2400 3000 6.32
    22316CTN1 22316KCTN1 170 58 2.1 412 515 2400 3000 6.27

    Frequently Asked Questions (FAQ)

    QWhat is the primary feature of the 21304 self-aligning roller bearing?

    The 21304 self-aligning roller bearing features a dual-row spherical roller design capable of accommodating shaft deflection and misalignment without increasing friction or operational temperature.

    QWhat are the speed limits under grease and oil lubrication?

    For the 21304 bearing, the limiting speed is 6,300 r/min when using grease lubrication and reaches up to 8,200 r/min under oil lubrication.

    QWhat do common suffixes like W33, K, CA, and CC indicate?

    W33 signifies lubrication grooves with three lubrication holes on the outer ring. K indicates a tapered bore. CA denotes a one-piece precision machined brass cage, while CC indicates a stamped steel cage.

    QWhich industries and machinery commonly use these bearings?

    They are widely applied in industrial machinery (rock drills, mixers, corrosion-resistant pumps, compression molding machines), automotive drivetrains, rolling mills, mining equipment, and metallurgical applications.

    QWhat precision grades and clearances are available?

    These bearings are manufactured with precision classes P0, P2, P4, P5, and P6, and internal clearance options include C0, C2, C3, C4, and C5.

    QAre OEM customization and specialized packaging options provided?

    Yes, OEM manufacturing services are fully supported to meet custom client requirements, packaged securely in pallets, wooden cases, or standard commercial packaging.

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