Among those famous sintered alnico magnets manufacturers, it is a professional supplier in China, welcome to wholesale alnico pickup magnets, alnico speaker magnet, pick up 5 magnets, horseshoe magnet, pickup magnets from our factory.Customized Sintered Alnico MagnetsSintered Alnico magnets are formed by compacting fine Alnico powder in a press and then sintering the compacted powder into a solid magnet. The powdered mixture of contents is pressed into a die under tons of pressure. It is then sintered in a hydrogen atmosphere at 2300F and then cooled – either within a magnetic field or without a magnetic field. When cooled within the magnetic field it is known as an anisotropic magnet and when cooled outside of a magnetic field it is called an isotropic magnet. The sintering process is well suited to large volume production.SpecificationDimension                   Tolerance Up to 0.125" Up to 3.18 mm           ±.005" .13 mm0.126" to 0.625" 3.20 to 15.88 mm       ±.010" .25 mm0.626" to 1.250" 15.90 to 31.75 mm      ±.015" .38 mmAdvantages and Disadvantages of Alnico Magnets· Alnico Br as high as NdFeB at room temperature.· Can be used up to 450-550 degrees C (842-932F).· Least variation in magnetic output with temperature change of any magnetic material. · Can be cast in very large sizes.· Sintered alnico is usually limited to small to medium sizes and simpler shapes.· Low coercivity (Hci) making them easy to demagnetise.· Complex cast alnico sometimes needs sand mold tooling which can be expensive if existing tooling is not available.Production Properties:  Magnetic Property Parameters of Sintered Alnico GradesEquivalent MMPA ClassRemanenceCoercive ForceCoercive ForceMaximum Energy ProductDensityReversible Temp. CoefficientCurie Temp.Temp. CoefficientBrHcbHcb(BH)maxg/cm3α(Hcj)TCTWmTGsKA/mOeKA/mOeKJ/m3MGOe%/°C°C°CSLN8Alnico3520520043540405008-101.0-1.256.8-0.02760450SLNG12Alnico27007000435404050012-141.5-1.757-0.014810450SLNGT18Alnico86006000107135095120018-222.25-2.757.2-0.02850550SLNGT28Alnico6100010000577105670028-303.5-3.87.2-0.02850525SLNG34Alnico5110011000516405063034-383.5-4.157.2-0.016890525SLNGT31Alnico878078001061130104130033-363.9-4.57.2-0.02850550SLNGT3880080001261580123155038-424.75-5.37.2-0.02850550SLNGT4288088001221530120150042-485.3-6.07.25-0.02850550SLNGT38JAlnico8HC73073001632050151190038-404.75-5.07.2-0.02850550Alnico Magnets - Physical Properties PropertyUnitsValue Sintered AlnicoValue Cast AlnicoVickers HardnessHv440440-620Densityg/cm36.8 - 7.06.9 - 7.3Curie Temp TC°C810 - 860740 - 860Curie Temp TF°F1,400 - 1,5801,460 - 1,580Specific ResistanceμΩ·Cm50- 7045 - 75Bending StrengthkN/mm20.35 - 0.760.05 - 0.31Tensile StrengthkN/mm20.35- 0.450.02 - 0.15Thermal Expansion°C-1+11.0 to +12.4 x10-6+11.0 to +13.0 x10-6Note:      The listed values are approximate and should be used as a reference. Any magnetic or physical characteristics should be substantiated before selecting a magnet material. Please engage GME’s Design / Development team members before selecting a design path.Our regular sizes for reference CylinderGradeDimensionsApplication　A(mm)B(mm)LNG401.579.525Micro-motorsLNG401.712Micro-motorsLNG403.17512.7Micro-motorsLNG40415SensorsLNG40510/15/17/18/20/25.4SensorsLNG40625/30/100SensorsLNG406.3525.4/31.75SensorsLNG40730SensorsLNG40820/25/30/50/150SensorsLN1095SensorsLNG409.52525.4/38.1/63.5SensorsLNG401010/12/15/30/140SensorsLNG521028SensorsLN1010.48MetersLNG401150SensorsLNG401230/50SensorsLNG4012.750.8/76.2CowsLNG402520AssemblyLNG523816BalancesRingGradeDimensionsApplications　A(mm)B(mm)　LN10234OdometersLN10255OdometersLN10233.5OdometersLNG13515MetersLNG1321810Port MachinesLN101429Port MachinesLNG40101.640SpeakersLNG4050.825.4MotorsLNG40101.638.1SpeakersBlock1GradeDimensionsApplication　ABCDEBlendersLNG3742203010　MetersLNG37551113.416　EducationLNG3728.67.625.48　HoldingLNG373020207.5D5HoldingLNG3745303011D5HoldingLNG3725.415.9　5.6D4.8HoldingLNG3719.0512.7　5.6D4.8HoldingLNG3731.7525.4　7.94D7.1HoldingLNG3740252510　HoldingLNG3739.625.425.410.3D5.5HoldingLNG3763.547.64614.3D4.8HoldingLNG3769.857.141.314.32XD7.9HoldingLNG3764122614　HoldingLNG371722106.25　MetersLNG3762266113　EducationLNG372113.116.26.2　MetersBlock2GradeDimensionsApplicationABCDLNG3763.512.73.175　Musical InstrumentsLNG375812.63　Musical InstrumentsLNG376012.73　Musical InstrumentsLNG3725.46.356.35　SensorsLNG3722.54.34.3　SensorsLNG4469252515Magnetic ChucksLNG3762133　Musical InstrumentsLNG40751510　EducationLNG37193.23.2　SensorsLNG37150166　EducationLNG402522.57　MetersLNG4025227R4MetersLNG404242206.5Magnetic ChucksLNG374520157Magnetic ChucksLNG375020207Magnetic ChucksLNGT72505040　Magnetic ChucksLNG52452415　Magnetic ChucksLNG524522.515　Magnetic ChucksLNG4459.559.52511Magnetic ChucksLNG404518.530.5　Magnetic BasesLNG405319.332　Magnetic BasesApplications:Mainly used for a variety of Meter, Odometer, Sensors, Motors, Multimeter, Telephone, Mobile, Watermeter, Eletricitymeter, Switch, Adhesion, Loudspeakers Port machines, Musical instruments, Magnetic chucks, Educations, Magnetic Bases etc.