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Arnold Magnetic Technologies
Sintered ALNICO Permanent Magnets

Sintered ALNICO Permanent Magnets

Product catalog summary

Introduction
Arnold Engineering has been a leader in permanent magnets for over 50 years, specializing in Alnico products known for their high flux density and stability across temperatures. These magnets are used in automotive, electronic sensors, magnetrons, and motors.

General Characteristics
Alnico magnets are iron, aluminum, nickel, and cobalt alloys. Their cobalt content affects magnetic properties, with lower grades being isotropic and higher grades like Alnico 5 and 8 being anisotropic. Alnico 5 is the most common, while Alnico 8 is suited for strong demagnetizing fields.

Manufacturing Processes
Alnico magnets can be cast or sintered. Sintering is ideal for small, high-volume production, offering structural strength. Arnold Engineering provides cost savings on small orders with standard tooling.

Magnetic and Physical Properties
Tables detail magnetic properties such as energy product, coercive force, and permeability, along with physical properties like density, tensile strength, and thermal expansion for various Alnico grades.

Temperature Effects
Alnico magnets are stable with reversible changes of 0.02% per degree Centigrade, but heating above 1000°F can cause irreversible magnetic strength loss.

Design Considerations
Alnico magnets are hard and brittle, unsuitable for drilling or machining. Simple shapes are preferred, and surfaces can be ground if needed. Magnetization should occur post-assembly to avoid contamination.

Ordering Information
Standard Alnico magnets are available, with custom designs possible. Inquiries should include detailed information for accurate responses.

Design Inquiry Requirements
For determined designs, include sketches, dimensions, tolerances, material grade, orientation, and magnetization status. For design assistance, provide operating point, flux density, physical stress, demagnetizing forces, temperature range, magnetic circuit description, mounting method, and application details.

Tooling and Cost Efficiency
Existing tooling may meet specifications, reducing costs. Detailed inquiries help provide efficient and economical parts.

Limited Warranty and Exclusive Remedy
Arnold Engineering warrants products to conform to industry standards and be defect-free. The company will repair or replace non-misused products at its discretion. This warranty is exclusive, and Arnold is not liable for consequential damages beyond warranty terms.

Contact Information
Arnold Engineering Company, Alnico Products Division, 300 North West Street, Marengo, IL 60152. Phone: (815) 568-2376. For quotations, contact via mail, fax, phone, or email at [email protected].

Catalog excerpts

Sintered ALNICO Permanent Magnets

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ALNICO PERMANENT MAGNETS Introduction For over 50 years an acknowledged leader in the field of permanent magnets, Arnold Engineering continues its tradition of superior quality and value with the full line of Alnico products presented in this catalog. One of the oldest members of our magnet family, Alnico remains the workhorse of the permanent magnet industry and can be relied upon to deliver impressive flux density at an economical price. Alnico also boasts the lowest temperature coefficient of any commercial magnet material (.02% per degree centigrade) allowing for excellent stability over...

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Max. Energy Residual Required Coersive Product Bd x Hd Induction Br Magnetizing Field Force Hc Recoil Permeability Permeance Coefficient B/H @ (BdHd) Max. Induction at Maximum Energy Product Sint. Alnico 2 Sint. Alnico 5 Sint. Alnico 6 Typical Demagnetization Curves O O o Q. -H (oersteds) Demagnetizing Field ARNOLD MAGNETIC TECHNOLOGIES

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Magnetic and Physical Properties (Typical Values) Density Electrical Resistivity Tensile Strength Transverse Modulus of Rupture Coefficient of Thermal Expansion Temperature Effects Sint. Alnico 2 ARNOLD MAGNETIC TECHNOLOGIES

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Magnetic and Physical Properties (Typical Values) Max. Energy Residual Required Coersive Product Bd x Hd Induction Br Magnetizing Field Force Hc Recoil Permeability Permeance Coefficient B/H @ (BdHd) Max. Induction at Maximum Energy Product Sint. Alnico 8B Sint. Alnico 8H Unoriented Sint. Alnico 8 Typical Demagnetization Curves ARNOLD MAGNETIC TECHNOLOGIES

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Electrical Resistivity Tensile Strength Transverse Modulus of Rupture Coefficient of Thermal Expansion Unoriented Sint. Alnico 8 0.252 6.98 Temperature EffectsSint. Alnico 8B Sint. Alnico 8H % Bd Unoriented Sint. Alnico 8 Reversible - ARNOLD MAGNETIC TECHNOLOGIES

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* These parts are furnished in Sintered Alnico 5 and are oriented parallel to the C dimension. ARNOLDMAGNETIC TECHNOLOGIES

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ARNOLD MAGNETIC TECHNOLOGIES

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Standard Alnico Tolerances Cast Alnico Dimension Up to 1" Up to 25.4 mm Sintered Alnico Dimension Up to .125" Up to 3.18 mm .126" to .625" 3.20 to 15.88 mm Concentricity Concentricity between inside and outside as cast diameters: .031" (.79 mm) F.I.R. when hole diameter is greater than hole length. 1.5 X total O.D. tolerance F.I.R. when hole diameter is less than hole length. Squareness Perpendicularity between one ground surface and an "as cast" surface is ±1-1/2 degrees. Finish Permanent magnet materials can be finish ground when dimensional tolerances closer than the initial manufacturing...

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Please refer to Alnico Product Specification Sheets when ordering standard Alnico permanent magnets. The magnets listed on these specification sheets, however, represent only a small percentage of the wide variety of shapes and sizes available in the various grades of Alnico. We invite your inquiries concerning magnet designs other than those listed. These inquiries should be submitted to Arnold Engineering, Marengo, Illinois, or to the nearest Arnold sales office. It is our desire to respond to your inquiries rapidly and accurately. In order to do this, your requests should contain certain magnetic,...

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THE ARNOLD ENGINEERING COMPANY Alnico Products Division 300 North West Street Marengo, IL 60152 Address: Reply Requested By: WFax ■Phone Phone No.: Fax No.: Arnold Part No.: Application and General Information:_ Direction of Orientation: Delivery Requested: Quantity/Estimated Annual Usage: Print or sketch — Please include description: all dimensions and tolerances; material; magnetic requirements and material grade required; type of coating and color. ARNOLD MAGNETIC TECHNOLOGIES

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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