Alnico Magnets | High-Temperature Permanent Magnets
Alnico magnets are permanent magnetic materials composed primarily of aluminum, nickel, and cobalt. They are known for exceptional temperature stability, corrosion resistance, and consistent magnetic performance in demanding industrial environments.
While Alnico magnets offer lower magnetic strength than rare earth materials, they excel in high-temperature applications where other magnet types may lose performance. Storch Magnetics supplies standard and custom Alnico magnets for prototype, production, sensing, holding, and precision applications.
Alnico Magnetic Materials
Available Alnico shapes include bars, rods, rails, rotors, side pole rotors, and horseshoe magnets. Precision cutting, grinding, EDM, fabrication, and assembly are available to meet your specifications and tolerances.
Alnico magnets perform well in operating temperatures above 400°F and can withstand temperatures up to 1000°F depending on the grade and application. For optimal performance, Alnico magnets should typically have a length at least five times their diameter or cross-section.
Features
- Excellent corrosion resistance
- Exceptional heat resistance and temperature stability
- Performs in continuous high-temperature environments
- Low to moderate magnetic strength
- Available in multiple standard and custom shapes
Benefits
- Reliable performance in high-temperature applications
- Maintains magnetic stability where other materials degrade
- Ideal for sensors, motors, and holding applications
- Long service life in harsh environments
- Custom-engineered solutions for your application
Typical Applications
- Temperature sensors and instrumentation
- Electric motors and generators
- Holding and positioning assemblies
- Aerospace and defense components
- Automotive sensing systems
Cast Alnico 5 Rod Magnets
Use the searchable chart below to review cast Alnico 5 rod magnet sizes by part number, diameter, and length.
| Part Number | Diameter (Inches) | Length (Inches) |
|---|---|---|
| A001-0187-5 | 0.187 | 5.000 |
| A001-0250-6 | 0.250 | 6.000 |
| A001-0375-6 | 0.375 | 6.000 |
| A001-0437-4 | 0.437 | 4.000 |
| A001-0500-6 | 0.500 | 6.000 |
| A001-0625-6 | 0.625 | 6.000 |
| A001-0750-6 | 0.750 | 6.000 |
| A001-0875-6 | 0.878 | 6.000 |
Tolerance: Dia. +/-.020", Length +/-.125", magnetized through length unless 2 poles on 1 face is specified.
Ground Alnico 5 Rod Magnets
Use the searchable chart below to review ground Alnico 5 rod magnet sizes by part number, diameter, and length.
| Part Number | Diameter (Inches) | Length (Inches) |
|---|---|---|
| A005-0062-4 | 0.062 | 4.000 |
| A005-0093-4 | 0.093 | 4.000 |
| A005-0125-4 | 0.125 | 4.000 |
| A005-0187-6 | 0.187 | 6.000 |
| A005-0218-6 | 0.218 | 6.000 |
| A005-0250-6 | 0.250 | 6.000 |
| A005-0263-6 | 0.263 | 6.000 |
| A005-0312-6 | 0.312 | 6.000 |
| A005-0375-6 | 0.375 | 6.000 |
| A005-0437-6 | 0.437 | 6.000 |
| A005-0500-6 | 0.500 | 6.000 |
| A005-0562-6 | 0.562 | 6.000 |
| A005-0625-6 | 0.625 | 6.000 |
| A005-0687-6 | 0.687 | 6.000 |
| A005-0750-6 | 0.750 | 6.000 |
| A005-0875-6 | 0.875 | 6.000 |
| A005-0937-6 | 0.937 | 6.000 |
Tolerance: Dia. +/-.001", Length +/-.125", magnetized through length unless 2 poles on 1 face is specified.
Cast Alnico 5 Bar Magnets
Use the searchable chart below to review cast Alnico 5 bar magnet sizes by part number, thickness, width, and length.
| Part Number | Thickness (Inches) | Width (Inches) | Length (Inches) |
|---|---|---|---|
| A010-0125-0500 | 0.125 | 0.500 | 4.000 |
| A010-0250-0750 | 0.250 | 0.750 | 6.000 |
| A010-0500-0750 | 0.500 | 0.750 | 6.000 |
| A010-0500-1500 | 0.500 | 1.500 | 6.000 |
| A010-0875-0875 | 0.875 | 0.875 | 6.000 |
| A010-1000-1000 | 1.000 | 1.000 | 6.000 |
Tolerance: Thickness and width +/-.020", length +/-.125", magnetized through length unless 2 poles on 1 face is specified.
Cast Alnico 5 Ring Magnets
Use the searchable chart below to review cast Alnico 5 ring magnet sizes by part number, outer diameter, inner diameter, and length.
| Part Number | Outer Diameter (OD) (Inches) | Inner Diameter (ID) (Inches) | Length (Inches) |
|---|---|---|---|
| A020-0125-0500 | 2.000 | 1.500 | 1.000 |
Tolerance: Ends ground to +/-.005", magnetized through length unless 2 poles on 1 face is specified.
Alnico 5 Disc Rotor Magnets
Use the searchable chart below to review Alnico 5 disc rotor magnet sizes by part number, outer diameter, inner diameter, and length.
| Part Number | Outer Diameter (OD) (Inches) | Inner Diameter (ID) (Inches) | Length (Inches) |
|---|---|---|---|
| A020-0125-0500 | 2.000 | 1.500 | 1.000 |
Tolerance: Ends +/-.005", OD +/-.001", magnetism oriented around diameter.
Alnico 5 Rotor Magnets
Use the searchable chart below to review Alnico 5 rotor magnet sizes by part number, outer diameter, inner diameter, length, and number of poles.
| Part Number | OuterDiameter(OD)(Inches) | InnerDiameter(ID)(Inches) | Length (Inches) | Number ofPoles |
|---|---|---|---|---|
| A025-1000 | 1.000 | 0.250 | 0.750 | 4 |
| A025-1250 | 1.250 | 0.250 | 0.750 | 6 |
| A025-2000 | 2.000 | 0.500 | 1.250 | 8 |
Tolerance: Back and poles +/-.005".
Cast Alnico 5 Horseshoes
Use the searchable charts below to review cast Alnico 5 horseshoe magnet sizes. These were separated into individual chart groups to match the original product drawings.
Cast Alnico 5 Horseshoe Magnets
Standard cast Alnico 5 horseshoe magnet sizes by part number, thickness, width, length, and hole size.
| Part Number | Thickness (Inches) | Width (Inches) | Length (Inches) | Hole (Inches) |
|---|---|---|---|---|
| A030-1250-1093 | 0.312 | 1.250 | 1.093 | 0.125 |
| A030-1500-1312 | 0.375 | 1.500 | 1.312 | 0.312 |
| A030-1500-1500 | 0.563 | 1.500 | 1.500 | n/a |
| A030-2000-1750 | 0.500 | 2.000 | 1.750 | 0.187 |
| A030-2000-2000 | 0.750 | 2.000 | 2.000 | n/a |
| A030-2500-2500 | 0.938 | 2.500 | 2.500 | n/a |
| A030-5000-4625 | 1.250 | 5.000 | 4.625 | 0.468 |
| A030-0719-1094 | 0.250 | 0.719 | 1.094 | n/a |
| A030-1187-1187 | 0.375 | 1.187 | 1.187 | n/a |
| A030-1625-1500 | 0.562 | 1.625 | 1.500 | n/a |
| A030-2000-1375 | 0.562 | 2.000 | 1.375 | n/a |
| A030-3000-1687 | 0.750 | 3.000 | 1.687 | n/a |
Cast Alnico 5 Channel Horseshoe Magnet
Single channel-style cast Alnico 5 horseshoe magnet size by part number, thickness, width, length, and hole size.
| Part Number | Thickness (Inches) | Width (Inches) | Length (Inches) | Hole (Inches) |
|---|---|---|---|---|
| A038-1625 | 0.843 | 1.625 | 0.375 | 0.250 |
Cast Alnico 5 Rail Magnet
Cast Alnico 5 rail magnet size by part number, thickness, width, length, and hole size.
| Part Number | Thickness (Inches) | Width (Inches) | Length (Inches) | Hole (Inches) |
|---|---|---|---|---|
| A039-0500 | 0.484 | 0.500 | 6.000 | n/a |
Tolerance: Ground on pole faces, magnetized as a U.
Cast Alnico 5 Round Horseshoe Magnets
The round horseshoe group includes three separate styles. Each style is shown with its matching image and chart below.
Cast Alnico 5 Round Horseshoe Magnets
Use the searchable chart below to review standard cast Alnico 5 round horseshoe magnet sizes by part number, diameter, length, and hole size.
| Part Number | Diameter (Inches) | Length (Inches) | Hole (Inches) |
|---|---|---|---|
| A35-0437 | 0.437 | 0.437 | 0.140 |
| A35-0625 | 0.625 | 0.625 | 0.187 |
| A35-0687 | 0.687 | 0.687 | 0.187 |
| A35-0875 | 0.875 | 0.875 | 0.250 |
| A35-1000 | 1.000 | 1.000 | 0.250 |
Cast Alnico 5 Round Horseshoe Magnet
Use the searchable chart below to review the A36-0687 round horseshoe magnet size by part number, diameter, length, and hole size.
| Part Number | Diameter (Inches) | Length (Inches) | Hole (Inches) |
|---|---|---|---|
| A36-0687 | 0.687 x 0.875 | 0.625 | 0.219 |
Cast Alnico 5 Round Horseshoe Magnet
Use the searchable chart below to review the A36-1250 round horseshoe magnet size by part number, diameter, length, and hole size.
| Part Number | Diameter (Inches) | Length (Inches) | Hole (Inches) |
|---|---|---|---|
| A36-1250 | 1.250 | 0.750 | 0.312 |
Sintered Alnico 2 Horseshoe Magnets
The sintered Alnico horseshoe group includes four separate styles. Each style is shown with its matching image and chart below.
Sintered Alnico 2 Horseshoe Magnet
Use the searchable chart below to review the A234-180 sintered Alnico 2 horseshoe magnet size by part number, thickness, width, and length.
| Part Number | Thickness (Inches) | Width (Inches) | Length (Inches) |
|---|---|---|---|
| A234-180 | 0.187 | 0.370 | 0.332 |
Sintered Alnico 2 Horseshoe Magnets
Use the searchable chart below to review A234 sintered Alnico 2 horseshoe magnet sizes by part number, thickness, width, length, and hole size.
| Part Number | Thickness (Inches) | Width (Inches) | Length (Inches) | Hole (Inches) |
|---|---|---|---|---|
| A234-182 | 0.375 | 0.750 | 0.281 | 0.135 |
| A234-183 | 0.375 | 0.875 | 0.375 | 0.120 |
Sintered Alnico 2 Horseshoe Magnet
Use the searchable chart below to review the A235-188 sintered Alnico 2 horseshoe magnet size by part number, thickness, width, and length.
| Part Number | Thickness (Inches) | Width (Inches) | Length (Inches) |
|---|---|---|---|
| A235-188 | 0.400 | 0.187 | 0.086 |
Sintered Alnico 2 Horseshoe Magnets
Use the searchable chart below to review A235 sintered Alnico 2 horseshoe magnet sizes by part number, diameter, length, channel, and hole size.
| Part Number | Diameter (Inches) | Length (Inches) | Channel (Inches) | Hole (Inches) |
|---|---|---|---|---|
| A235-193 | 0.500 | 0.265 | 0.140 wide x 0.187 depth | 0.101 |
| A235-194 | 0.500 | 0.254 | 0.119 wide x 0.187 depth | 0.101 |
NOTE: Magnets will be shipped magnetized unless otherwise specified.
A full list of everything available would be huge. Additional sizes, metric sizes, and high-temperature variants are available in all grades.
Don’t see the Alnico magnet size, shape, or strength you need? Contact us. Storch can often source Alnico magnets outside the standard sizes shown above.
Frequently Asked Questions
What makes Alnico magnets different from neodymium or ceramic magnets?
Alnico magnets offer superior temperature stability and corrosion resistance but have lower magnetic strength compared to neodymium magnets.
What is the maximum operating temperature of Alnico magnets?
Alnico magnets can operate in temperatures up to approximately 1000°F, depending on the grade and application.
Are Alnico magnets corrosion resistant?
Yes. Alnico magnets have excellent natural corrosion resistance and typically do not require protective coatings.
Can Alnico magnets be custom machined?
Yes. Alnico magnets can be cut, ground, EDM machined, and fabricated to meet specific dimensional and performance requirements.
What applications are best suited for Alnico magnets?
Applications involving high temperatures, sensing, instrumentation, motors, or stable magnetic fields over time are good fits for Alnico magnets.
Are custom Alnico sizes and shapes available?
Yes. Storch can support standard and custom Alnico magnets, including bars, rods, rings, rotors, rails, horseshoes, and assemblies.