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Magnet Specifications


	Magnet Type		A permanent magnet always exhibits magnetic properties, whether inside a magnetic field, or not. Permanent magnet materials are designated by Magnetic Materials Producers Association (MMPA) Class. Each addresses the relevant properties, characteristics and specifications of each material, and the established sub-grades. Historically recognized sub-grade descriptions (such as Alnico 1, 2, etc., or Ceramic 5, 8, etc.) are often referenced. The Brief Designation classifies each sub grade by the normal energy product and the typical intrinsic coercive force. For example, a material having a normal energy product of 5.0 mega gauss-oersteds (MGO) and an intrinsic coercive force of 2000 oersteds (2.0 key) would be assigned a Brief Designation of 5.01/2.0. Many times an IEC Grade Code will also be presented for cross-reference.
	Your choices are...
	Individual Magnets		The term individual magnet denotes a magnet purchased in a size and shape that is ready for direct incorporation into a magnetic circuit.
	Bulk Magnet Materials		Bulk magnet material designates bar, rod, slab, strip, sheet, powder, etc., from which the purchaser cuts, stamps, or forms individual magnets.
	Magnetic Assembly		A magnetic assembly consists of one or more magnets and other components, such as steel, that can affect the properties of the magnet.
	Magnetic Sweeper		Magnetic sweepers can be made from a variety of permanent magnet materials. They are used for picking up small ferrous parts, such as staples, bolts, screws, and iron or steel particles from floors, driveways, walkways, or lawns and gardens. Magnetic sweepers are available as hand held, tow behind, or forklift-mounted units.
	Magnetic Lift		Magnetic lifts are designed for material handling and provide a lightweight, cost-effective means of transporting ferrous material. Magnetic lifts hold workloads. Surface conditions, material thickness, surface finish, and weight of the workload are factors that will affect the overall performance of magnetic lifts. Some magnetic lifts are hand tools, while others require mounting to a forklift or crane.
	Magnetic Sheet Handler		Magnetic sheet handlers give a positive grip on steel sheets and plates. They are designed primarily for sliding and pulling, but not for lifting.
	Magnetic Retriever		Magnetic retrievers are made specifically to retrieve ferrous metal items from hard to reach places. The handles may be telescoping, fixed, or flexible.
	Rare-Earth Magnet		Rare-Earth magnets are permanent magnets made of alloys of rare earth components. They have the strongest magnetic field of most magnets.
	Permanent / Electromagnet Combination		The permanent / electromagnet combination provides for safely holding the load, even if power is accidentally removed from the magnet.
	Other		Other unlisted, specialized, or proprietary configuration.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Permanent Magnet Materials
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	NdFeB (Neodymium Iron Boron)		Neodymium iron boron, a rare earth magnet, is the most recent commercial addition to the family of modern magnet materials. Its general composition is Nd₂Fe₁₄B, often-abbreviated NdFeB. At room temperatures, NdFeB magnets exhibit the highest properties of all magnet materials.
	SmCo (Samarium Cobalt)		Samarium cobalt is manufactured in two compositions: Sm₁Co₅ and Sm₂Co₁₇ - often referred to as the SmCo 1:5 or SmCo 2:17 types. 2:17 types, with higher H_ci values, offer greater inherent stability than the 1:5 types.
	Ceramic (Ferrite)		Ceramic, also known as ferrite, magnets (general composition BaFe₂O₃or SrFe₂O₃) have been commercialized since the 1950s and continue to be extensively used today due to their low cost. A special form of ceramic magnet is "flexible" material, made by bonding ceramic powder in a flexible binder.
	AlNiCo (Aluminum-Nickel-Cobalt)		AlNiCo magnets (general composition Al-Ni-Co) were commercialized in the 1930s and are still extensively used today.
	Iron-Chromium-Cobalt		Iron-chromium-cobalt magnets offer the considerable advantage of being receptive to plastic deformation processing such as rolling and drawing. They can be used for compact, complex shapes that are difficult or impossible to achieve with other types of materials.
	Other		Other unlisted, specialized, or proprietary configuration.
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Strength


	Holding Force		The force the magnet is capable of holding under ideal conditions. Conditions such as the size and shape of the parts, the surface conditions, motion, vibration, friction, holding angles, and machining forces will affect the holding force of the magnet and should be factored into the magnetic circuit design
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Maximum Magnetic Field		The strength, in gauss, of the magnetic field created by the magnet.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Maximum Energy Product, BH_max		Also known as the magnet strength or grade. The point on the demagnetization curve where the product of B and H is a maximum and the volume of magnet material required to project a given energy into its surroundings is a minimum. It is measured in mega gauss-oersteds, MGOe.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Residual Induction, B_r		A value of induction at the point at which the hysteresis loop crosses the B axis at zero magnetizing force. The B_r represents the maximum magnetic flux density output of this material without an external magnetic field.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Coercive Force, H_c		The demagnetizing force, measured in oersteds, necessary to reduce observed induction, B to zero after the magnet has previously been brought to saturation.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Intrinsic Coercive Force, H_ci		The intrinsic ability of a material to resist demagnetization. Its value is measured in oersteds and corresponds to zero intrinsic induction in the material after saturation. Permanent magnets with high intrinsic coercive force are referred as "hard" permanent magnets, which usually is associated with high temperature stability.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

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Physical Specifications


	Geometry
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	Block / Bar		Block / bar magnets of rectangular or square shape. Dimensions for length, width, and thickness are specified.
	Flexible Strip / Sheet		Flexible magnetic material is easily cut, punched, machined and slit to almost any specification. Flexible magnetic strip may also be available with adhesive backing. These magnets are specified by thickness and width.
	Sheet or Slab		Bulk magnet materials supplied in sheet or slab, which the user manufactures into individual magnets.
	Rod		Rod magnets (or cylindrical bars) are long and round. Dimensions specified are diameter and length.
	Powder		The magnet material is supplied in powdered form for manufacturing.
	Horseshoe / U-shape		Horseshoe magnets are specified with width and length (or diameter for round horseshoe magnets), height, and gap. U-shaped magnets are specified by width and length (or diameter for round U-shaped magnets), and height.
	Button / Pot		Button magnets are circular shaped horseshoe magnets that are easy to mount. They are specified by diameter, height, slot size, and hole diameter. Pot magnets are cylindrical shaped magnets with a tapped hole for securing. The dimensions specified are diameter, height, and thread size.
	Round / Ring / Disc		Ring magnets are round, flat, and have an internal bore. Dimensions normally specified are outside diameter, inside diameter, and thickness. Disc magnets are round, flat, and do not have an internal bore. Dimensions specified are diameter and thickness.
	Sphere / Bead		The magnet is a sphere or bead and is specified by radius or diameter.
	Arc Segment		Arc segment magnets are often used in motors. They are specified by outside radius, inside radius, length, width, and height.
	Rotor / Poles		Rotors look like gears and have an even number of poles spaced equally around the magnet. Pole magnets are often referred to as holding magnets, and are specified as magnetic assemblies. Dimensions specified include outside diameter, inside diameter, thickness, width of poles, and width of space between poles.
	Other		Other unlisted, specialized, or proprietary configuration.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Magnetization / Orientation
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	Not Magnetized		The magnet is not magnetized. The magnet may be magnetized after it has been assembled in the magnetic circuit.
	Conventional		The magnet has one pole on each side, the north pole on one side, and the south pole on the other. Magnets can be magnetized through the thickness, length, or diameter.
	Multiple		The magnet has multiple poles on each side. Two or more sets of poles on each surface. North and South poles alternate through the thickness of the material.
	Other		Other unlisted, specialized, or proprietary configuration.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Number of Poles		The number of poles on one face of the magnet.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

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Weight and Dimensions


	Weight		The overall weight of the magnet.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Width		The overall width of the magnet, assembly, or electromagnet.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Length		The overall length of the magnet, assembly, or electromagnet.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Thickness / Height		The overall thickness of the magnet, assembly, or electromagnet.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Outside Diameter		The outside diameter of round horseshoe or u-shaped magnets, button / pot, ring / disc, sphere, arc segments, or rotor magnets. Or the diameter of round magnetic separation components or electromagnets.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Inside Diameter		The inside diameter of round ring / disc, button / pot, arc segments, or rotor magnets.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

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Features


	Machinable		The magnet can be machined to desired size and shape. Magnets should be machined using diamond tools or soft grinding wheels, and in the unmagnetized state as far as possible.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Coating		The magnet is coated or plated with a corrosion resistant material. NdFeB magnets are particularly prone to corrosion due to their high iron content. Coatings may be available in a variety of colors.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Manual Release		Lift magnets or magnetic sheet handlers typically have a release feature. These can be a handle or button for manual release.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

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