Sintered NdFeB Axially Magnetized Ring Magnet N40M Zinc Plating Feature:
Magnet Material: NdFeB or Neodymium Iron Boron
Magnet shape: Ring
Magnet grade: 40M
Outer diameter: 72mm
Inner diameter: 63mm
Thickness: 8mm
Tolerance: +/-0.1mm (0.004”)
Coating: Zinc plated
Operating Temp(Max).: 100℃
Direction of magnetization: Magnetized through thickness
Circular Powerful NdFeB Magnet Ring 40M OD72xID63x8mm
Material type: Permanent
Material composition: Nd2Fe14B
Remanence (Br): 12.5– 13.1KGs
Coercive force(Hcb): 11.5KOe
Intrinsic Coercive Force( Hci ) : 14KOe
Max Energy (BH)max: 38 – 41MGOe
Max working temp. : 100℃
Curie Point (Max). : 212℉
Density : 7.4~7.6g/cm3
Neodymium Ring Magnet are great for loudspeaker, home theater, multimedia, headset, water meter, vibration motor, etc.
Sintered NdFeB Magnet Ring are supplied in different grades and sizes, maximum diameter 220mm, minimum thickness 1.0mm. Ring magnet, which are magnetized through thickness (axially), north pole and south pole are located on the top and bottom. Axially magnetized is common magnetism for ring magnets. Diameterically magnetized also can be made as per customer’s different requirement.
Other size and grade are available on request
Disc Magnet Magnetized through thickness
Axially Magnetized
Diametrically Magnetized
Multi-poles Diametrically
Neodymium magnets can be divided into three main groups:
Regular Neodymium
High corrosion resistant Neodymium
Bonded Neodymium (Isotropic): Manufactured by the injection of plastic material and Neodymium into a mold. This production method yields a very precise magnet which does not require further grinding and does not suffer substantial current loss.
Neo magnets are known for their high temperature resistance, making them durable and functional in temperatures exceeding 200°C. This quality makes them ideal for heavy industry applications. Sintered Neodymium, however, is sensitive to oxidization and can develop corrosion, so magnets are usually coated with Zinc, Nickel (and more different coatings) for their protection. Sintered NdFeB Countersink Ring Magnet w/ 5 Holes N35 D100x3mm
Neodymium magnets offer the highest (BH)max and high Hci
(BH)max, the maximum energy product, of neodymium magnets is highest of any kind of permanent magnets today in the world. (BH)max at different grades of neodymium magnets is 27 to 52 MGOe. Super Strong Disc Neodymium Grate Magnet
Neodymium magnets are sensitive to temperature change and even lose magnet properties at high temperature
Neodymium magnets lose -0.09 ~ -0.13% of Br/oC and can work stably under 80oC for low Hci Neodymium magnets and 150oC for high Hci Neodymium magnets.
Neodymium magnets are corrupted in humid environment
Surface protection is strongly recommended, such as plating, varnishing and encapsulating.
HSMAG Magnetics N40 neodymium magnets in disk and rectangle shapes for customers’ immediate needs and accept special orders for custom neodymium magnets.
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