Alnico Magnets For Sale

Neodymium Magnets 09/21/2020

Alnico magnets for sale

Alnico Magnets For Sale

Alnico Magnets - Permanent Magnets

Alnico Magnets are composed primarily of Aluminum (Al), Nickel (Ni), & Cobalt (Co). These permanent ... Alnico magnets operate well at very high temperatures.

Alnico Magnets

Alnico Magnets are the weakest of permanent magnets however they have excellent temperature stability and very good non-corrosiveness.

Their mechanical strength is greater than either Neodymium or Ceramic/Ferrite magnets. Alnico magnets are widely used in industrial and consumer applications where moderate strength permanent magnets are needed;

examples are electric motors, electric guitar pickups, microphones, sensors, loudspeakers, magnetron tubes, and cow magnets.

In many applications, they are being superseded by rare-earth magnets.

Alnico Magnets have excellent temperature stability and are very resistant to corrosion.

Alnico magnets come in different shapes such as cylinders, blocks, pots, and the popular horseshoe magnet.

Horseshoe magnets are the most recognizable Alnico Magnet.

About alnico magnets

hight performance Alnico ring magnets

Alnico refers to a family of iron alloys which are composed primarily of aluminum (Al), nickel (Ni), and cobalt (Co), hence the name Al-Ni-Co.

Alnico magnets have high resistance to loss of magnetism. They are also one of the most stable magnets if they are handled properly.

Alnico magnets are electrically conductive, unlike ceramic magnets.

Of the more commonly available magnets, only Neodymium magnets and Samarium magnets are stronger but Alnico Magnets can operate at temperatures up to 500°C

We are here to help!

Please contact our sales team if you have any questions about our Alnico Magnets.

Alnico Magnet Supply

Very small magnets, usually one ounce or less, are produced using press and sinter techniques.

Alnico horseshoe magnets provide a compact, high power magnetic source, and are used for traction, lifting, sorting, clamping, and retrieval.

Grinding and Tolerances

Alnico is hard and brittle (45-55 Rockwell C), and is not suitable for drilling, tapping, or conventional machining operations.

Holes are usually roughcast during the foundry process and magnets are cast close to their final size and then finish machined to closer tolerances if necessary.

d5x18mm cylinder alnico 5mm magnet

ALB provides in-house cutting and grinding to meet your application requirements.


The most efficient utilization of Alnico magnets requires that they be magnetized after the magnet is assembled in the final magnetic circuit.

Shipping the alnico magnets before magnetizing them also eliminates the need for special packaging and prevents contamination by potential contact with ferrous materials.

Learn more about magnetization of alnico magnets

Temperature Constraints and Demagnetization

Alnico has the best temperature coefficient of any but the most advanced commercial magnet material, providing excellent stability over a wide temperature range.

A properly designed circuit using Alnico magnets will have a stable flux output during temperature fluctuations.

Learn more about temperature constraints and demagnetization of alnico magnets

Other Design Considerations

Because Alnico is hard and brittle and not suitable for drilling, tapping, or conventional machining operations, it is not usually used as a structural component in product design. We recommend selecting simple shapes when possible, fitting into slots rather than holes.

Cross-sections of less than .125" (3.18 mm) should be avoided. Finishing increases cost, so if your application can use “as cast” or “as sintered” then the cost will be lower.

permanent cast industrial alnico magnet ring

For holding applications requiring mounting, or to protect the magnet, alnico assemblies such as rotors or magnetron magnets may be supplied with aluminum housings.

Alnico may be painted for aesthetic reasons, like the ever-popular red horseshoe magnet.

Alnico Magnet Manufacturing Methods

Most Alnico magnets are manufactured using typical foundry casting techniques, where the molten alloy is poured into sand molds.

Very small magnets, usually one ounce or less, are produced using press and sinter techniques.

Sintered Alnico magnets have features that make them particularly effective in very small precision devices.

Sintering magnets with small holes and intricate shapes is possible.

Sintered magnets are available in both isotropic and anisotropic form, with a broad range of unit properties.

Their magnetic properties are similar but often slightly lower than cast magnets of equivalent grade.

Alnico magnets, cast and sintered, are finished ground using abrasive grinding to produce the final shape and tolerance.

Once ground the material is a shiny metallic finish.

These materials are brittle and cannot be machined or drilled.

custom made cast alnico magnets

New in 2020, we've added more curves, and a coatings chart to assist with corrosion protection decisions.

Chart of Material Properties

Displays each permanent magnet material along with its Maximum Energy Product: Bhmax, Residual Flux Density: Br Gauss, Coercive Force: Hc Oersteds, Intrinsic Coercive Force: Hci Oersteds and Maximum Operating Temperature: C / F.

Breakaway Force of a Magnet

Explains the test methods used to determine how much force it takes to pull a magnet directly away from the surface it is attached to.

Standard Specifications for Permanent Magnet Materials

Defines thermal and mechanical characteristics and properties of commercially available permanent magnet materials including Alnico, Ceramic, Rare Earth (Samarium cobalt and neodymium) and Iron-Chromium-Cobalt.

Includes a Glossary of Terms and Magnetic Quantities (Symbols, Units and Conversion Factors).

Aluminum-Nickel-Cobalt for Sale

AlNiCo magnetic material is an alloy of Aluminum-Nickel-Cobalt which possesses excellent temperature stability and high residual induction.

AlNiCo magnets have a low Coercive Force that limits their applications in many cases.

Casting and sintering are two major processes used to manufacture the AlNiCo magnets.

the permanent industrial alnico magnet ring

Miniature - Micro Magnets: Neodymium, Samarium Cobalt (SmCo), and Strontium Ferrite (Ceramic), Aluminum Nickel Cobalt (Alnico) magnets

Oftentimes ultra-small magnets are limited to bonded magnetic products, but now ALB can deliver miniature, fully dense Neodymium Iron Boron (Neo), Samarium Cobalt (SmCo), and Strontium Ferrite (Ceramic). In addition, ALB can supply miniature cast Aluminum Nickel Cobalt (Alnico) magnets, a magnet alloy that has been traditionally been limited in non-micro sizes.

Samarium Cobalt Diametric Magnet on a Paperclip

Environmental Protection:

As well as manufacturing a variety of small magnet solutions, ALB Magnets can provide an array of coating or plating options. Conventional magnet corrosion inhibiting solutions can be applied such as Nickel and Epoxy but also Parylene C which is oftentimes used for its inertness when the magnet will be exposed to an organic environment.(*Please note–As with larger magnets, the penetration of a corrosion inhibiting layer is limited inside small holes and features.)

High Temp. Neo Discs N42UH with Pen Tip

Geometries: All shapes and available, Discs, Blocks, Rings, Arcs, and Spheres as well as custom geometries. What is especially beneficial to the market is ALB deep hole capability. This is where the hole length is greater than the diameter of the part.

Miniature / Micro Magnet Capabilities

Neodymium Magnet Information

Magnet Terminology

The terminology of magnetics is not widely understood. You can find definitions of most terms on our Glossary of Magnet Terminology Page.

Rare Earth Magnets: Neodymium magnets are a member of the Rare Earth magnet family and are the most powerful permanent magnets in the world. They are also referred to as NdFeB magnets, or NIB, because they are composed mainly of Neodymium (Nd), Iron (Fe), and Boron (B). They are a relatively new invention and have only recently become affordable for everyday use.

custom made cast alnico magnets

Grades of Neodymium

N35, N38, N42, N52, N42SH...what does it all mean? Neodymium magnets are all graded by the material they are made of. As a very general rule, the higher the grade (the number following the 'N'), the stronger the magnet. The highest grade of neodymium magnet currently available is N52. Any letter following the grade refers to the temperature rating of the magnet. If there are no letters following the grade, then the magnet is standard temperature neodymium. The temperature ratings are standard (no designation) - M - H - SH - UH - EH. You find the temperature rating of each grade on our Specifications of Neodymium Magnets Page.

Specifications of Neodymium Magnets

If you need detailed information about the physical and thermal properties of neodymium magnetic materials, you can find it on our Specifications of Neodymium Magnets Page.


Neodymium magnets are a composition of mostly Neodymium, Iron, and Boron.

If left exposed to the elements, the iron in the magnet will rust.

To protect the magnet from corrosion and to strengthen the brittle magnet material, it is usually preferable for the magnet to be coated.

There are a variety of options for coatings, but nickel is the most common and usually preferred.

Our nickel-plated magnets are actually triple plated with layers of nickel, copper, and nickel again.

This triple coating makes our magnets much more durable than the more common single nickel plated magnets.

Some other options for coating are zinc, tin, copper, epoxy, silver, and gold.

alnico bar block magnets

Our gold plated magnets are actually quadruple plated with nickel, copper, nickel, and a top coating of gold.

Machining: Neodymium material is brittle and prone to chipping and cracking, so it does not machine well by conventional methods.

Machining the magnets will generate heat, which if not carefully controlled, can demagnetize the magnet or even ignite the material which is toxic when burned.

It is recommended that magnets not be machined.

Demagnetization: Rare Earth magnets have a high resistance to demagnetization, unlike most other types of magnets.

They will not lose their magnetization around other magnets or if dropped.

They will, however, begin to lose strength if they are heated above their maximum operating temperature, which is 176°F (80°C) for standard N grades. They will completely lose their magnetization if heated above their Curie temperature, which is 590°F (310°C) for standard N grades.

Some of our magnets are of high-temperature material, which can withstand higher temperatures without losing strength.

Strength: If you've never handled neodymium magnets before, you will be amazed at their strength.

Neodymium magnets are over 10x stronger than the strongest ceramic magnets.

If you are currently using ceramic magnets in your project, you could probably use a much smaller neodymium magnet and have a greater holding force. You can get an idea of the relative strength of each of our magnets on our Magnet Summary Page. The surface field of each of our stock magnets is also listed on that same page. We also offer an online magnet calculator to help you estimate the pull force and field strength of magnets at any distance from the magnet.

The potential uses for strong neodymium magnets are unlimited!

Alnico Bar Magnets

NOTE: Actual product may vary from the one pictured due to differences in suppliers. WARNING: CHOKING HAZARD-Small parts. Not for children under 3 years.

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How to choose and buy a strong neodymium magnet? ALBMagnets is a professional company for strong magnet design and manufacturing,
providing you with reliable N35, N38, N42, N52, N42SH and other grade super neodymium magnets and SmCo rare earth magnets.

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