20pcs N50 15mm x 4mm 5mm Hole Strong Round Neodymium Countersunk Ring Magnets

Description:
20pcs N50 Strong Round Neodymium Countersunk Ring Magnets 15mm x 4mm Hole 5mm
Neodymium (chemical symbol Nd) is element 60 on the periodic table. It is a rare earth metal and forms one of the Lanthanides series. When added to Iron (Fe) and Boron (B) (chemical formula Nd14Fe21B) the resultant magnets are the strongest magnets currently available. Neodymium magnets are sometimes known as Neo, Neod or NIB magnets.
Neodymium magnet are usually coated Nickel-Copper-Nickel plating to prevent the iron from rusting.
Neodymium block magnet  was made of  NdFeB, have strong magnetic performances and appearance does not rust, usually placed in room temperature, the maximum  operating temperature is 80 ° C , and it never will demagnetization.
Specification:
Shape: Disc Round
Magnetic face: 15mm * 4mm (Dia. * Thickness )
Hole Dia. : 5mm
Plating: Ni-Cu-Ni ( Nickel )
Material: NdFeB
Grade:N50
Color:  Silver
Quantity: 20pcs
Applications:
1, Acoustic field: the speaker, receiver, microphone, alarm, stage audio, car audio and so on.
2, Electronics: permanent magnetic actuator vacuum circuit breakers, magnetic relays, meter, meter, sound meter, a reed switch, sensors.
3, Electrical field: VCM, CD / DVD-ROM, generators, motors, servo motors, micro-motors, motors, vibration motors.
4, Machinery and equipment: magnetic separation, magnetic crane, magnetic machinery.
5, Healthcare: MRI scanners, medical equipment, magnetic health products and so on.
6, Other industries: magnetized Wax, pipe descaling, magnetic fixture, automatic mahjong machine, magnetic locks, doors and windows magnetic, magnetic luggage, leather magnetic toys, magnetic tools, gifts and packaging.
Tip:
1, Strong magnets should Keep away from Ironware and some  easily magnetized iron products, such as monitors, bank cards, computers, televisions, mobile phones and other
2, Strong magnets should be stored in a dry, heated environment, and need to use of plastic, wood, cardboard, foam to separated and wrapped.
3, Magnets might affect water meter ,electric meter, gas meter and some metering equipment exist some inaccurate affect
(Such as : if magnets placed near  the meter, the meter will slow down)
Notice:  Please be careful fragile and  be care to break apart.
Package included:
20X N50 Strong Disc Magnets