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Alumina Bearing — Full Ceramic, Insulated & Corrosion-Resistant

Alumina Bearing provides electrically insulated, corrosion-resistant motion components for pumps, valves, furnace conveyors, and test fixtures. Standard IDs/ODs are available; custom ID/OD/width, raceway geometry, and cage material can be specified.

Catalogue No. AT-AB-ZC684CE
Material Alumina
Insulation Performance ≥10¹² Ω at room temperature
Dimensional Accuracy up to ±0.02–0.05 mm on ground raceways
Dimensions/Sizes Download PDF
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Alumina Bearing is a bearing made primarily from aluminum oxide (Al₂O₃) ceramic—either as a full-ceramic rolling bearing (rings and balls in alumina, usually with a non-metallic cage like PTFE/PEEK) or as an alumina sleeve/bushing used for sliding/guide motion. It is chosen when engineers need electrical insulation, non-magnetic behavior, and corrosion resistance that metal bearings cannot provide.

Alumina Bearing Advantages

  • True Electrical Insulation — breaks stray current paths that damage metal bearings in VFD or sensor systems.
  • Chemical Stability — alumina rings/balls resist acids, alkalis, and many solvents, reducing corrosion-induced seizure.
  • Non-Magnetic Operation — stable performance near magnetic sensors or induction equipment.
  • Ground Raceways — controlled runout and Ra ≤0.2 µm on critical tracks for smoother motion in precision assemblies.
  • Thermal Window Engineering — supports dry or boundary-lubricated service with suitable cages/coatings defined per application.

 

Alumina Ceramic Bearing Properties

Property Unit 99.5% Al₂O₃ 99.6% Al₂O₃ 99.7% Al₂O₃ 99.8% Al₂O₃ 99.9% Al₂O₃ 99.99% Al₂O₃
Alumina content % 99.5 99.6 99.7 99.8 99.9 99.99
Density g/cm³ 3.89 3.91 3.92 3.93 3.94 3.98
Open porosity % 0 – – – – –
Color – Ivory Ivory Ivory Ivory Ivory Ivory
Water absorption % – 0 0 0 0 0
Young’s modulus (Elastic modulus) GPa 375 356 357 358 359 362
Shear modulus GPa 152 – – – – –
Bulk modulus GPa 228 – – – – –
Poisson’s ratio – 0.22 – – – – –
Compressive strength MPa 2600 2552 2554 2556 2558 2570
Flexural strength MPa 379 312 313 314 315 320
Fracture toughness MPa·m¹ᐟ² 4 – – – – –
Hardness GPa 14.1 (≈1440 kg/mm²) 23 24 25 26 30
Thermal conductivity W/m·K 35 32–37 33–38 34–39 35–40 36–42
Thermal shock resistance ΔT °C – 222 223 224 225 228
Maximum use temperature (no load) °C ≤1750 1755 1760 1765 1770 1800
Coefficient of thermal expansion 10⁻⁶/°C 8.4 – – – – –
Specific heat J/kg·K 880 – – – – –
Volume resistivity Ω·cm >1×10¹⁴ >1×10¹⁴ >1×10¹⁴ >1×10¹⁴ >1×10¹⁴ >1×10¹⁴
Dielectric constant (relative permittivity) – 9.8 9.83 9.84 9.85 9.86 9.92
Dielectric strength kV/mm 16.9 23.2 23.4 23.6 23.8 24
Dissipation factor (loss factor @ 1 kHz) – 0.0002 – – – – –

 

Specifications of Alumina Bearing

size

 

Alumina Bearing
Item NO. Model Product Size （mm） r (Min) Install Size (mm)
d（Inner Dia) D（Outer Dia） B（Height） da (Min) Max Max Max
AT-AB-ZC684CE 684CE 4 9 2.5 0.1 4.8 / 8.2 0.1
AT-AB-ZC694CE 694CE 4 11 4 0.15 5.2 / 9.8 0.15
AT-AB-ZC604CE 604CE 4 12 4 0.2 5.6 / 10.4 0.2
AT-AB-ZC624CE 624CE 4 13 5 0.2 5.6 / 11.4 0.2
AT-AB-ZC634CE 634CE 4 16 5 0.3 6 / 14 0.3
AT-AB-ZC685CE 685CE 5 11 3 0.15 6.2 / 9.8 0.15
AT-AB-ZC695CE 695CE 5 13 4 0.2 6.6 / 11.4 0.2
AT-AB-ZC605CE 605CE 5 14 5 0.2 6.6 / 12.4 0.2
AT-AB-ZC625CE 625CE 5 16 5 0.3 7 / 14 0.3
AT-AB-ZC635CE 635CE 5 19 6 0.3 7 / 17 0.3
AT-AB-ZC686CE 686CE 6 13 3.5 0.15 7.2 / 11.8 0.15
AT-AB-ZC696CE 696CE 7 15 5 0.2 7.6 / 13.4 0.2
AT-AB-ZC606CE 606CE 8 17 6 0.3 8 / 15 0.3
AT-AB-ZC626CE 626CE 9 19 6 0.3 8 / 17 0.3
AT-AB-ZC636CE 636CE 10 22 7 0.3 8 / 20 0.3
AT-AB-ZC687CE 687CE 7 14 3.5 0.15 8.2 / 12.8 0.15
AT-AB-ZC697CE 697CE 7 17 5 0.3 9 / 15 0.3
AT-AB-ZC607CE 607CE 7 19 6 0.3 9 / 17 0.3
AT-AB-ZC627CE 627CE 7 22 7 0.3 9 / 20 0.3
AT-AB-ZC637CE 637CE 7 26 9 0.3 9 / 24 0.3
AT-AB-ZC688CE 688CE 8 16 4 0.2 9.6 / 14.4 0.2
AT-AB-ZC698CE 698CE 8 19 6 0.3 10 / 17 0.3
AT-AB-ZC608CE 608CE 8 22 7 0.3 10 / 20 0.3
AT-AB-ZC628CE 628CE 8 24 8 0.3 10 / 22 0.3
AT-AB-ZC638CE 638CE 8 28 9 0.3 10 / 26 0.3
AT-AB-ZC689CE 689CE 9 17 4 0.2 10.6 / 15.4 0.2
AT-AB-ZC699CE 699CE 9 20 6 0.3 11 / 18 0.3
AT-AB-ZC609CE 609CE 9 24 7 0.3 11 / 22 0.3
AT-AB-ZC629CE 629CE 9 26 8 0.3 11 / 24 0.3
AT-AB-ZC639CE 639CE 9 30 10 0.6 13 / 26 0.6
AT-AB-ZC6800CE 6800CE 10 19 5 0.3 12 12 17 0.3
AT-AB-ZC6900CE 6900CE 10 22 6 0.3 12 12.5 20 0.3
AT-AB-ZC6000CE 6000CE 10 26 8 0.3 12 13 24 0.3
AT-AB-ZC6200CE 6200CE 10 30 9 0.6 14 16 26 0.6
AT-AB-ZC6300CE 6300CE 10 35 11 0.6 14 16.5 31 0.6
AT-AB-ZC6801CE 6801CE 12 21 5 0.3 14 14 19 0.3
AT-AB-ZC6901CE 6901CE 12 24 6 0.3 14 14.5 22 0.3
AT-AB-ZC16001CE 16001CE 12 28 7 0.3 14 / 26 0.3
AT-AB-ZC6001CE 6001CE 12 28 8 0.3 14 15.5 26 0.3
AT-AB-ZC6201CE 6201CE 12 32 10 0.6 16 17 28 0.6
AT-AB-ZC6301CE 6301CE 12 37 12 1 17 18 32 1
AT-AB-ZC6802CE 6802CE 15 24 5 0.3 17 17 22 0.3
AT-AB-ZC6902CE 6902CE 15 28 7 0.3 17 17 26 0.3
AT-AB-ZC16002CE 16002CE 15 32 8 0.3 17 / 30 0.3
AT-AB-ZC6002CE 6002CE 15 32 9 0.3 17 19 30 0.3
AT-AB-ZC6202CE 6202CE 15 35 11 0.6 19 20.5 31 0.3
AT-AB-ZC6302CE 6302CE 15 42 13 1 20 22.5 37 1
AT-AB-ZC6803CE 6803CE 17 26 5 0.3 19 19 24 0.3
AT-AB-ZC6903CE 6903CE 17 30 7 0.3 19 19.5 28 0.3
AT-AB-ZC16003CE 16003CE 17 35 8 0.3 19 / 33 0.3
AT-AB-ZC6003CE 6003CE 17 35 10 0.3 19 21.5 33 0.3
AT-AB-ZC6203CE 6203CE 17 40 12 0.6 21 23.5 36 0.6
AT-AB-ZC6303CE 6303CE 17 47 14 1 22 25.5 42 1
AT-AB-ZC6403CE 6403CE 17 62 17 1.1 23.5 / 55.5 1
AT-AB-ZC6804CE 6804CE 20 32 7 0.3 22 22.5 30 0.3
AT-AB-ZC6904CE 6904CE 20 37 9 0.3 22 24 35 0.3
AT-AB-ZC16004CE 16004CE 20 42 8 0.3 22 / 40 0.3
AT-AB-ZC6004CE 6004CE 20 42 12 0.6 24 25.5 38 0.6
AT-AB-ZC6204CE 6204CE 20 47 14 1 25 26.5 42 1
AT-AB-ZC6304CE 6304CE 20 52 15 1.1 26.5 28 45.5 1
AT-AB-ZC6404CE 6404CE 20 72 19 1.1 26.5 / 65.5 1
AT-AB-ZC6805CE 6805CE 25 37 7 0.3 27 27 35 0.3
AT-AB-ZC6905CE 6905CE 25 42 9 0.3 27 28.5 40 0.3
AT-AB-ZC16005CE 16005CE 25 47 8 0.3 27 / 45 0.3
AT-AB-ZC6005CE 6005CE 25 47 12 0.6 29 30 43 0.6
AT-AB-ZC6205CE 6205CE 25 52 15 1 30 32 47 1
AT-AB-ZC6305CE 6305CE 25 62 17 1.1 31.5 36 55.5 1
AT-AB-ZC6405CE 6405CE 25 80 21 1.5 33 / 72 1.5
AT-AB-ZC6806CE 6806CE 30 42 7 0.3 32 32 50 1
AT-AB-ZC6906CE 6906CE 30 47 9 0.3 32 34 57 1
AT-AB-ZC16006CE 16006CE 30 55 9 0.3 32 42.5 65.5 1
AT-AB-ZC6006CE 6006CE 30 55 13 1 35 36.5 53 1
AT-AB-ZC6206CE 6206CE 30 62 16 1 35 38.5 60 1
AT-AB-ZC6306CE 6306CE 30 72 19 1.1 36.5 42.5 68.5 1
AT-AB-ZC6406CE 6406CE 30 90 23 1.5 54 / 82 2
AT-AB-ZC6807CE 6807CE 35 47 7 0.3 37 37 45 0.3
AT-AB-ZC6907CE 6907CE 35 55 10 0.6 39 39 51 0.6
AT-AB-ZC16007CE 16007CE 35 62 9 0.3 37 / 60 0.3
AT-AB-ZC6007CE 6007CE 35 62 14 1 40 41.5 57 1
AT-AB-ZC6207CE 6207CE 35 72 17 1.1 41.5 44.5 65.5 1
AT-AB-ZC6307CE 6307CE 35 80 21 1.5 43 47 72 1.5
AT-AB-ZC6407CE 6407CE 35 100 25 1.5 43 / 92 1.5
AT-AB-ZC6808CE 6808CE 40 52 7 0.3 42 42 50 0.3
AT-AB-ZC6908CE 6908CE 40 62 12 0.6 44 46 58 0.6
AT-AB-ZC16008CE 16008CE 40 68 9 0.3 42 / 66 0.3
AT-AB-ZC6008CE 6008CE 40 68 15 1 45 47.5 63 1
AT-AB-ZC6208CE 6208CE 40 80 18 1.1 46.5 50.5 73.5 1
AT-AB-ZC6308CE 6308CE 40 90 23 1.5 48 53 80 1.5
AT-AB-ZC6408CE 6408CE 40 110 27 2 49 / 101 2
AT-AB-ZC6809CE 6809CE 45 58 7 0.3 47 47.5 56 0.3
AT-AB-ZC6909CE 6909CE 45 68 12 0.6 49 50 64 0.6
AT-AB-ZC16009CE 16009CE 45 75 10 0.6 49 / 71 0.6
AT-AB-ZC6009CE 6009CE 45 75 16 1 50 53.5 70 1
AT-AB-ZC6209CE 6209CE 45 85 19 1.1 51.5 55.5 78.5 1
AT-AB-ZC6309CE 6309CE 45 100 25 1.5 53 61.5 92 1.5
AT-AB-ZC6409CE 6409CE 45 120 29 2 54 / 111 2
AT-AB-ZC6810CE 6810CE 50 65 7 0.3 52 52.5 63 0.3
AT-AB-ZC6910CE 6910CE 50 72 12 0.6 54 55 68 0.6
AT-AB-ZC16010CE 16010CE 50 80 10 0.6 54 / 76 0.6
AT-AB-ZC6010CE 6010CE 50 80 16 1 55 58.5 75 1
AT-AB-ZC6210CE 6210CE 50 90 20 1.1 56.5 60 83.2 1
AT-AB-ZC6310CE 6310CE 50 110 27 2 59 68 101 2
AT-AB-ZC6410CE 6410CE 50 130 31 2.1 61 / 119 2
AT-AB-ZC6811CE 6811CE 55 72 9 0.3 57 59 70 0.3
AT-AB-ZC6911CE 6911CE 55 80 13 1 60 61.5 75 1
AT-AB-ZC16011CE 16011CE 55 90 11 0.6 59 / 86 0.6
AT-AB-ZC6011CE 6011CE 55 90 18 1.1 61.5 64 83.5 1
AT-AB-ZC6211CE 6211CE 55 100 21 1.5 63 66.5 92 1.5
AT-AB-ZC6311CE 6311CE 55 120 29 2 64 72.5 111 2
AT-AB-ZC6411CE 6411CE 55 140 33 2.1 66 / 129 2
AT-AB-ZC6812CE 6812CE 60 78 10 0.3 62 64 76 0.3
AT-AB-ZC6912CE 6912CE 60 85 13 1 65 66 80 1
AT-AB-ZC16012CE 16012CE 60 95 11 0.6 64 / 91 0.6
AT-AB-ZC6012CE 6012CE 60 95 18 1.1 66.5 69 88.5 1
AT-AB-ZC6212CE 6212CE 60 110 22 1.5 68 74.5 102 1.5
AT-AB-ZC6312CE 6312CE 60 130 31 2.1 71 79 119 2
AT-AB-ZC6412CE 6412CE 60 150 35 2.1 71 139 2
AT-AB-ZC6813CE 6813CE 65 85 10 0.6 69 69 81 0.6
AT-AB-ZC6913CE 6913CE 65 90 13 1 70 71.5 85 1
AT-AB-ZC16013CE 16013CE 65 100 11 0.6 69 / 96 0.6
AT-AB-ZC6013CE 6013CE 65 100 18 1.1 71.5 73 93.5 1
AT-AB-ZC6213CE 6213CE 65 120 23 1.5 73 80 112 1.5
AT-AB-ZC6313CE 6313CE 65 140 33 2.1 76 85.5 129 2
AT-AB-ZC6814CE 6814CE 70 90 10 0.6 74 74.5 86 0.6
AT-AB-ZC6914CE 6914CE 70 100 16 1 75 77.5 95 1
AT-AB-ZC16014CE 16014CE 70 110 13 0.6 74 / 106 0.6
AT-AB-ZC6014CE 6014CE 70 110 20 1.1 76.5 80.5 103.5 1
AT-AB-ZC6214CE 6214CE 70 125 24 1.5 78 84 117 1.5
AT-AB-ZC6314CE 6314CE 70 150 35 2.1 81 92 139 2
AT-AB-ZC6815CE 6815CE 75 95 10 0.6 79 79.5 91 0.6
AT-AB-ZC6915CE 6915CE 75 105 16 1 80 82 100 1
AT-AB-ZC16015CE 16015CE 75 115 13 0.6 79 / 111 0.6
AT-AB-ZC6015CE 6015CE 75 115 20 1.1 81.5 85.5 108.5 1
AT-AB-ZC6215CE 6215CE 75 130 25 1.5 83 90 122 1.5
AT-AB-ZC6816CE 6816CE 80 100 10 0.6 84 84.5 96 0.6
AT-AB-ZC6916CE 6916CE 80 110 16 1 85 87.5 105 1
AT-AB-ZC16016CE 16016CE 80 125 14 0.6 84 / 121 0.6
AT-AB-ZC6016CE 6016CE 80 125 22 1.1 86.5 91 118.5 1
AT-AB-ZC6216CE 6216CE 80 140 26 2 89 95.5 131 2
AT-AB-ZC6817CE 6817CE 85 110 13 1 90 90.5 105 1
AT-AB-ZC6917CE 6917CE 85 120 18 1.1 91.5 94.5 113.5 1
AT-AB-ZC16017CE 16017CE 85 130 14 0.6 89 / 126 0.6
AT-AB-ZC6017CE 6017CE 85 130 22 1.1 91.5 96 123.5 1
AT-AB-ZC6217CE 6217CE 85 150 28 2 94 102 141 2
AT-AB-ZC6818CE 6818CE 90 115 13 1 95 95.5 110 1
AT-AB-ZC6918CE 6918CE 90 125 18 1.1 96.5 98.5 118.5 1
AT-AB-ZC16018CE 16018CE 90 140 16 1 95 / 135 1
AT-AB-ZC6018CE 6018CE 90 140 24 1.5 98 103 132 1.5
AT-AB-ZC6819CE 6819CE 95 120 13 1 100 102 115 1
AT-AB-ZC6919CE 6919CE 95 130 18 1.1 101.5 104 123.5 1
AT-AB-ZC16019CE 16019CE 95 145 16 1 100 / 140 1
AT-AB-ZC6019CE 6019CE 95 145 24 1.5 103 109 137 1.5
AT-AB-ZC6820CE 6820CE 100 125 13 1 105 106 120 1
AT-AB-ZC6920CE 6920CE 100 140 20 1.1 106.5 111 133.5 1
AT-AB-ZC16020CE 16020CE 100 150 16 1 105 / 145 1
AT-AB-ZC6020CE 6020CE 100 150 24 1.5 108 113 142 1.5
AT-AB-ZC6821CE 6821CE 105 130 13 1 110 111 125 1
AT-AB-ZC6921CE 6921CE 105 145 20 1.1 111.5 116 138.5 1
AT-AB-ZC6822CE 6822CE 110 140 16 1 115 117 135 1
AT-AB-ZC6922CE 6922CE 110 150 20 1.1 116.5 121 143.5 1
AT-AB-ZC6824CE 6824CE 120 150 16 1 125 127 145 1
AT-AB-ZC6924 6924 120 165 22 1.1 / / / /
AT-AB-ZC16024 16024 120 180 19 1 / / / /
AT-AB-ZC6024 6024 120 180 28 2 / / / /
AT-AB-ZC6224 6224 120 215 40 2.1 / / / /
AT-AB-ZC6324 6324 120 260 55 3 / / / /
AT-AB-ZC6826 6826 130 165 18 1.1 / / / /
AT-AB-ZC6926 6926 130 180 24 1.5 / / / /
AT-AB-ZC16026 16026 130 200 22 1.1 / / / /
AT-AB-ZC6026 6026 130 200 33 2 / / / /
AT-AB-ZC6226 6226 130 230 40 3 / / / /
AT-AB-ZC6326 6326 130 280 58 4 / / / /
AT-AB-ZC6828 6828 140 175 18 1.1 / / / /
AT-AB-ZC6928 6928 140 190 24 1.5 / / / /
AT-AB-ZC16028 16028 140 210 22 1.1 / / / /
AT-AB-ZC6028 6028 140 210 33 2 / / / /
AT-AB-ZC6228 6228 140 250 42 3 / / / /
AT-AB-ZC6328 6328 140 300 62 4 / / / /
AT-AB-ZC6830 6830 150 190 20 1.1 / / / /
AT-AB-ZC6930 6930 150 210 28 2 / / / /
AT-AB-ZC16030 16030 150 225 24 1.1 / / / /
AT-AB-ZC6030 6030 150 225 35 2.1 / / / /
AT-AB-ZC6230 6230 150 270 45 3 / / / /
AT-AB-ZC6330 6330 150 320 65 4 / / / /
AT-AB-ZC60/22 60/22 22 44 12 0.6 / / / /
AT-AB-ZC62/22 62/22 22 50 14 1 / / / /
AT-AB-ZC63/22 63/22 22 56 16 1.1 / / / /
AT-AB-ZC60/28 60/28 28 52 12 0.6 / / / /
AT-AB-ZC62/28 62/28 28 58 16 1 / / / /
AT-AB-ZC63/28 63/28 28 68 18 1.1 / / / /
AT-AB-ZC60/32 60/32 33 58 13 1 / / / /
AT-AB-ZC62/32 62/32 33 65 17 1 / / / /
AT-AB-ZC63/32 63/32 33 75 20 1.1 / / / /
AT-AB-ZC603CE 603CE 3 9 3 / / / / /
AT-AB-ZC606CE 606CE 6 17 6 / / / / /
AT-AB-ZCMR117 MR117 7 11 3 / / / / /
AT-AB-ZCMR128 MR128 8 12 3.5 / / / / /
AT-AB-ZCMR85 MR85 5 8 2.5 / / / / /
AT-AB-ZCMR63-1 MR63-1 3 6 2.5 / / / / /
AT-AB-ZCMR85-1 MR85-1 5 8 2 / / / / /
AT-AB-ZCMR148 MR148 8 14 4 / / / / /
AT-AB-ZCMR84 MR84 4 8 2 / / / / /
AT-AB-ZCMR126 MR126 6 12 4 / / / / /
AT-AB-ZCMR74-1 MR74-1 4 7 2 / / / / /
AT-AB-ZCMR84-1 MR84-1 4 8 3 / / / / /
AT-AB-ZCMR74 MR74 4 7 2.5 / / / / /
AT-AB-ZCMR148 MR148 8 14 3.5 / / / / /
AT-AB-ZCMR63 MR63 3 6 2 / / / / /
AT-AB-ZCMR103 MR103 3 10 4 / / / / /
AT-AB-ZCMR104 MR104 4 10 4 / / / / /
AT-AB-ZCMR105 MR105 5 10 3 / / / / /
AT-AB-ZCMR105-1 MR105-1 5 10 4 / / / / /
AT-AB-ZCMR106 MR106 6 10 2.5 / / / / /
AT-AB-ZCMR106-1 MR106-1 6 10 3 / / / / /
AT-AB-ZCMR115 MR115 5 11 4 / / / / /
AT-AB-ZCMR52 MR52 2 5 2.5 / / / / /
AT-AB-ZCMR62 MR62 2 6 2.5 / / / / /
AT-AB-ZCMR94 MR94 4 9 3 / / / / /
AT-AB-ZCMR95 MR95 5 9 3 / / / / /
AT-AB-ZCR188 R188 6.35 12.7 4.763 / / / / /
AT-AB-ZCR6 R6 9.525 22.225 5.556 / / / / /

 

Alumina Ceramic Bearing Packaging

  • Each bearing is carefully packed to ensure safety during transit. Custom packaging options are available depending on the customer's specific needs.

Alumina Ceramic Bearing Packaging

Applications of Alumina Ceramic Bearing

  • Chemical Process Equipment (pumps, dosing units)

    ✅Key Advantages

    1. Insulated rolling path prevents stray-current pitting in dosing drives.
    2. Alumina rings/balls resist acid/alkali attack, extending service cycles.
    3. Ground raceways reduce friction spikes during start/stop duty.

    ✅ Problem Solved

    A metering-pump retrofitted to alumina deep-groove bearings with PTFE cage reduced corrosion-related bearing changes from every 6–8 weeks to 20+ weeks under chloride-rich media. Start/stop torque fluctuation dropped ~12% after switching to Ra ≤0.2 µm raceways; unplanned downtime per quarter was cut by 1 shift.

  • Furnace Conveyors & Thermal Handling

    ✅Key Advantages

    1. Non-metallic bearing path avoids scale transfer in hot zones.
    2. Dimensional stability supports tracking on ceramic rollers.
    3. All-ceramic stack tolerates boundary-lube cycles.

    ✅ Problem Solved

    On a heat-treat carrier, alumina sleeve bearings with polished bores stabilized conveyor tracking, lowering jam incidents from ~5/month to 1–2/month. Component swaps moved from monthly to quarterly with the same cycle count.

  • Test, Measurement & Non-Magnetic Fixtures

    ✅Key Advantages

    1. Non-magnetic bearing set preserves sensor accuracy near coils.
    2. Insulation (≥10¹² Ω) avoids ground loops in instrumentation.
    3. Tight runout improves repeatability for probe motion.

    ✅ Problem Solved

    A probe fixture near inductive sensors replaced stainless bearings with alumina thrust pairs; signal drift events fell >70%, and calibration intervals extended from 2 to 6 weeks due to reduced magnetic interference and better runout control.

Alumina Bearing—Usage Instructions

  • Installation

    1. Verify shaft and seat fit strictly follow the rawings; never force-fit alumina bearings onto misaligned or undersized shafts.
    2. Use a manual or pneumatic arbour press with soft pads; avoid hammering or localized impact that could cause micro-cracks.
    3. Ensure axial alignment between housing and shaft before seating; any tilt above 0.05 mm per 10 mm width can cause premature edge chipping.
    4. Align cages and thrust collars before final positioning, and check axial endplay or preload based on the designed clearance class.
    5. For press-fit assemblies, maintain uniform load during installation — recommended press speed ≤ 3 mm/s to prevent stress concentration.

  • Operation

    1. Define the correct lubrication mode: dry-film for intermittent operation, boundary-lube for continuous duty, or media-lubricated in chemical pumps.
    2. Avoid sudden acceleration or high shock loads; ceramic components respond poorly to mechanical impact.
    3. Monitor bearing temperature during initial cycles — alumina operates stably up to 1000 °C (depending on cage and lubricant), but thermal gradients above 15 °C/min may cause microfractures.
    4. Validate insulation paths when used in electrical or inductive systems; ensure no stray currents bypass through bearing seats or housings.

  • Storage

    1. Store in dry, dust-free packaging with silica-gel desiccant; relative humidity should remain below 60%.
    2. Avoid stacking or direct metal contact to prevent surface abrasion.
    3. Keep away from magnetic fields, metallic particles, or strong vibrations that could alter concentricity.
    4. For long-term storage (>12 months), re-inspect for surface discolouration or contamination before use.

  • Cleaning

    1. Use only neutral solvents (isopropanol, acetone, or deionized water) compatible with alumina.
    2. Rinse thoroughly and allow to dry completely before assembly — moisture trapped in micro-pores can cause steam expansion under temperature rise.
    3. Avoid abrasive tools; use lint-free cloths or soft polymer swabs to maintain the Ra ≤ 0.2 µm raceway finish.
    4. Never apply compressed air directly onto rolling elements; indirect blow-off is preferred.

  • Maintenance & Troubleshooting (Cautions & Remedies)

    1. Edge Chipping
    Cause: misaligned pressing or excessive interference during fit.
    Remedy: check chamfer lead-in (≥ 0.5 mm × 45° recommended); use alignment mandrels and uniform pressing force.

    2. Unexpected Noise / Rough Rotation
    Cause: debris trapped or cage misalignment.
    Remedy: disassemble and flush; inspect Ra, cage seating, and reapply thin boundary grease or dry-film lubricant.

    3. Runout Beyond Specification
    Cause: shaft or housing concentricity off, or improper preload setting.
    Remedy: re-measure fit tolerances; re-bush or regrind shaft journals to achieve ≤ 0.02 mm TIR.

    4. Thermal Shock Cracking (added)
    Cause: rapid temperature cycling > 15 °C/min or uneven heating.
    Remedy: warm components gradually; use heat-soak zones or slow ramping in furnace environments.

    5. Premature Wear in Media-Lubricated Applications (added)
    Cause: media particle contamination or insufficient clearance for slurry flow.
    Remedy: add fine filtration (≤ 50 µm), verify clearance class (C3 or C4), and monitor particle buildup.

Alumina Bearing FAQ

  1. Q: Can I replace my metal bearing 1:1 with an Alumina Bearing?
    A: Yes, if the load, speed, and fit tolerances are compatible. Provide your shaft/housing dimensions and operating conditions, and we can confirm interchangeability or suggest a modified design.

  2. Q: What clearance options are available for Alumina Bearings?
    A: Standard options include CN, C3, C4, or custom pre-load clearances depending on your geometry and thermal expansion needs. Clearance adjustments help maintain stability across temperature variations.

  3. Q: Can Alumina Bearings handle acids, alkalis, or solvents?
    A: Yes. Alumina (Al₂O₃) is highly resistant to many acids, alkalis, and organic solvents. However, for high-concentration H₂SO₄ or HF, material compatibility should be verified before use.

  4. Q: What is the temperature limit for Alumina Bearings?
    A: Depending on cage and lubrication type, alumina bearings can operate up to 1000°C in dry or clean atmospheres. With PTFE or PEEK cages, typical service temperatures range from 250–350°C.

  5. Q: Are Alumina Bearings non-magnetic and electrically insulated?
    A: Yes. Both the rings and balls are non-magnetic and fully electrically insulated, making them ideal for use near magnetic sensors, high-frequency motors, or electronic testing devices.

  6. Q: Can I order Alumina Bearings with polished raceways or special finishes?
    A: Absolutely. We can supply ground or polished raceways with surface roughness up to Ra ≤ 0.2 µm, or media-finished surfaces for smoother motion and lower startup torque.

  7. Q: What information should I provide to get a quotation?
    A: Please include:
    1. Inner and outer diameters, width, and clearance class
    2. Application type (rotational speed, temperature, and medium)
    3. Required surface finish (Ra value) and cage material
    4. Quantity and whether you need a sample before bulk production

  8. Q: Is an Alumina Bearing stronger than a steel or zirconia bearing?

    A: An Alumina Bearing is not mechanically stronger than zirconia or steel bearings, but it offers superior insulation, corrosion resistance, and high-temperature stability.
    It’s best suited for chemical, vacuum, or electrically isolated environments, where metal or zirconia bearings may conduct current, corrode, or generate contamination.

    Property Alumina Bearing (Al₂O₃) Zirconia Bearing (ZrO₂) Steel Bearing (AISI 440C / Stainless)
    Mechanical Strength Moderate (compressive strength ~2,000 MPa); not ideal for impact or high shock loads Very high (compressive strength ~2,200–2,500 MPa); better for dynamic or impact use High tensile & fatigue strength; good under heavy loads
    Hardness ~HRA 88–90 ~HRA 90–92 ~HRC 58–62
    Density 3.9 g/cm³ (lightweight, stable) 6.0 g/cm³ (heavier) 7.8 g/cm³ (heaviest)
    Thermal Resistance Excellent up to 1000 °C continuous Excellent up to 800 °C continuous Limited (~250 °C)
    Corrosion Resistance Outstanding — inert to most acids, alkalis, and solvents Very good — resistant to most corrosives Moderate — prone to rust or pitting without coating
    Electrical Insulation Fully insulating (non-conductive) Fully insulating Conductive (metallic)
    Magnetism Non-magnetic Non-magnetic Magnetic (unless using austenitic steel)
    Cost Level Moderate (cost-effective for insulating/corrosive environments) Higher (premium ceramic) Low to medium

What our Clients Say about Alumina Bearing

  • ⭐️⭐️⭐️⭐️⭐️
    Using alumina bearings from ADCERAX has eliminated current leakage on our chloride dosing pumps. The insulated design stopped the stray voltage pitting issue completely, and bearing replacements dropped to nearly zero
    -- Michael Turner, Maintenance Supervisor, ChemPro Dosing Systems
  • ⭐️⭐️⭐️⭐️⭐️
    We ordered custom alumina ceramic bearings from ADCERAX to match our shaft layout. The geometry tolerance and surface finish were spot-on, improving conveyor alignment and minimizing vibration
    -- Hannah Lee, Procurement Manager, Nordic Thermal Components
  • ⭐️⭐️⭐️⭐️⭐️
    Our test rigs required non-magnetic components close to sensors. The alumina thrust bearings from ADCERAX provided full insulation and dimensional repeatability, cutting our calibration downtime in half.
    -- Ryo Tanaka, R&D Engineer, Metrix Instruments
  • ⭐️⭐️⭐️⭐️⭐️
    ADCERAX designed alumina bearings with PEEK cages for our high-cycle packaging line. The assemblies run smoother now, startup torque is lower, and we’ve had no unexpected stoppages for months
    -- Carlos Gómez, Plant Engineer, PacLinea Packaging
Quick Quote Now
customize size

Customize Alumina Bearing

Many applications need tailored geometry and material pairings. Provide a drawing or target fit, and we will align raceways, cages, and tolerances to the system. What you can specify:

1. Dimensional Control
• ID/OD/width precision — critical diameter tolerance ±0.02–0.05 mm
• Roundness & runout verified per drawing

2. Stack-Up Length
• Sleeve or thrust pair height; matched sets available

3. End Configuration
• Open/closed/chamfered edges
• Relief grooves or lubrication notches are optional

4. Raceway Geometry
• Deep-groove curvature or thrust collar faces
• Flat or crowned profile per application

5. Clearance & Fit Class
• Options: CN, C3, C4, or custom pre-load settings

6. Cage Material
• PTFE, PEEK, or all-ceramic spacers for high-temperature use

7. Surface Finish
• As-fired, ground, or polished Ra ≤ 0.2 µm
• Optional media-finished texture

8. Coatings / Films
• Dry-film lubricants for start/stop or low-lubrication environments

Start customizing today

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