NEODYMIUM MAGNETS

Neodymium magnets (Nd-Fe-B) are composed of neodymium, iron, boron and a few transition metals. These magnets are extremely strong for their small size, metallic in appearance and found in simple shapes such as rings, blocks and discs. Not sure if Neodymium is the best material for your application? Click here for an attribute and application comparison for all of the magnetic materials we offer.

Choose from one of the following shapes:

NEODYMIUM BLOCK MAGNETS

NEODYMIUM DISC MAGNETS

NEODYMIUM DISC MAGNETS WITH ADHESIVE

NEODYMIUM RING MAGNETS

NEODYMIUM SPHERE MAGNETS

Applications
Attributes
Tolerances
Machining
Magnetizing & Handling
Magnetic & Physical Properties
Compare & Contrast

Applications of Neodymium Magnets

Magnetic separators
Linear actuators

Microphone assemblies
Servo motors

DC motors (automotive starters)
Computer rigid disc drives, printers and speakers

Attributes of Neodymium Material

Very high resistance to demagnetization
High energy for size
Good in ambient temperature
Moderately priced

Material is corrosive and should be coated for long term maximum energy output
Low working temperature for heat applications, but higher levels of heat resistance materials are being introduced periodically

Tolerances

For as pressed material, tolerance on the thickness (direction of magnetization) is ± .005. Other dimensions are ± 2.5% or ± .010, whichever is greater. According to IMA standards, visual imperfections such as hairline cracks, porosity and minor chips are commonly found in sintered metallic magnets. A chipped edge is considered acceptable if no more than 10% of the surface is missing. Cracks are acceptable as long as they do not extend across more than 50% of pole surface.

Machining

Since neodymium magnet material is prone to chipping and cracking, it does not lend itself to conventional machining methods. However, neodymium can be abrasively ground, but only with the use of liberal amounts of coolant. The coolant minimizes heat fracturing and the risk of fires caused by oxidized grinding dust.

Magnetizing and Handling

Neodymium magnets are very brittle and very strong magnetically. Therefore, it is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnets. Fingers can be severely pinched between attracting magnets. Magnets can chip if allowed to “jump at” an attracting object. It is highly recommended that when constructing rare earth magnetic assemblies, they be magnetized after assembly.

Typical Magnetic and Physical Properties of Neodymium Magnet Material
Magnetic Material	Density		Max. Energy Product BH (max)	Residual Induction BR	Coercive Force HC	Intrinsic Coercive Force HC	Normal Maximum Operating Temp.		Curie Temp.
Magnetic Material	lbs/in	g/cm	MGO	Gauss	Oersteds	Oersteds	Fº	Cº	Fº	Cº
Neodymium 27SH	0.267	7.4	27.0	10800	9800	20000	302	150	644	340
Neodymium 30H	0.267	7.4	30.0	11000	10500	17000	248	120	626	330
Neodymium 35	0.267	7.4	35.0	12300	10500	12000	176	80	593.6	312
Neodymium 40	0.267	7.4	40.0	12900	10500	12000	176	80	593.6	312
Neodymium 42	0.267	7.4	42.0	13000	9500	11140	176	80	593.6	312
Neodymium 45	0.267	7.4	45.0	13500	11000	12000	176	80	593.6	312
Since many combinations of elements and orientations are possible, additional grades are available.

Compare and Contrast Magnetic Applications and Materials

Applications of Neodymium Magnets Magnetic separators Linear actuators Microphone assemblies Servo motors DC motors (automotive starters) Computer rigid disc drives, printers and speakers	Attributes of Neodymium Material Very high resistance to demagnetization High energy for size Good in ambient temperature Moderately priced Material is corrosive and should be coated for long term maximum energy output Low working temperature for heat applications, but higher levels of heat resistance materials are being introduced periodically

Applications of Ceramic Magnets Speaker magnets DC brushless motors Magnetic Resonance Imaging (MRI) Magnetos used on lawnmowers and outboard motors DC permanent magnet motors (used in cars) Separators (separate ferrous material from non-ferrous) Used in magnetic assemblies designed for lifting, holding, retrieving and separating	Attributes of Ceramic Material Least expensive material compared to alnico and rare earth magnets High intrinsic coercive force Available in simple shapes only due to manufacturing process Lower service temperature than alnico, greater than rare earth Finishing requires diamond cutting or grinding wheel Lower energy product than alnico and rare earth magnets Most common grades of ceramic are 1, 5 and 8 (1-8 possible) Grade 8 is the strongest ceramic material available Tooling can be expensive

Applications of Samarium Cobalt Magnets Computer disc drives Sensors Traveling wave tubes Linear actuators Satellite systems Motors where temporary stability is vital	Attributes of Samarium Cobalt Material High resistance to demagnetization High energy (magnetic strength is strong for its size) Good temperature stability Expensive material (cobalt is market price sensitive)

Applications of Alnico Magnets Magnetos Separators Sensors Electron tubes Traveling wave tubes Radar Holding magnets Coin acceptors Clutches and bearings Motors Distributors Relays Controls Generators Receivers Telephones Microphones Bell ringers Guitar pickups Loudspeakers Security systems Cow magnets	Attributes of Cast Alnico Size parameters range from 1 ounce to about 70 pounds Will cast to a variety of shapes and sizes Attributes of Sintered Alnico Size parameters range from about one ounce of material up to one cubic inch Pressed to close tolerance/minimal grinding to finish Mechanically strongest of alnicos Attributes of Both Cast and Sintered Alnico Very temperature stable, great for high heat applications Maximum working temperature 975° - 1020° F May be ground to size Does not lend itself to conventional machining (hard and brittle) High residual induction and energy product compared to ceramic material Low coercive force compared to ceramic and rare earth materials (more subject to demagnetization) Most common grades are 5 and 8

Call 1.888.293.9399 for information or click here to request a quote.

NEODYMIUM MAGNETS

Call 1.888.293.9399 for information
or click here to request a quote.