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Arnold Magnetic Technologies
Cast Alnico Permanent Magnet

Cast Alnico Permanent Magnet

Product catalog summary

Introduction
Arnold Engineering has been a prominent provider of Alnico magnets for over 50 years, known for their high flux density and cost-effectiveness. These magnets are stable across a wide temperature range, making them suitable for applications in automotive and electronic sensors, as well as traditional uses like magnetrons and motors.

General Characteristics
Alnico magnets are primarily composed of iron, aluminum, nickel, and cobalt, with varying cobalt content. Grades range from Alnico 3 (0% cobalt) to Alnico 8 (40% cobalt). Lower grades are isotropic, while higher grades are anisotropic, optimized for specific magnetic directions. Alnico 5 is the most popular for its economical energy delivery, whereas Alnico 8 is ideal for strong demagnetizing fields.

Manufacturing Processes
These magnets are produced in diverse shapes and sizes, primarily through casting in sand molds, with smaller magnets often made by sintering for structural strength and large volume production.

Stock Items and Tooling
Arnold offers a variety of standard shapes and sizes with existing tooling, allowing for immediate shipment and cost savings by eliminating the need for new production tooling.

Magnetic and Physical Properties
Detailed tables provide magnetic and physical properties for various Alnico grades, including energy product, coercive force, and temperature effects.

Temperature Effects
Graphs show reversible and irreversible changes in magnetic properties with temperature for different Alnico grades.

Dimensions and Holding Force
Dimensions and holding force values are detailed for various magnet shapes, such as bars, cylinders, and horseshoe magnets, under ideal conditions.

Specifications
Specifications for Alnico magnets, including Cast Alnico 5 and 8, cover dimensions, weights, and holding forces, with tables for channel bars, washers, rotors, bars, rods, and rings.

Procedures
Handling and usage procedures emphasize magnetizing after assembly and special packaging to prevent contamination, recommending impulse magnetizers for efficiency.

Standards and Tolerances
Standard tolerances for Cast and Sintered Alnico include dimensional variations and concentricity requirements, along with finish and magnetization standards.

Design Considerations
Design advice includes accounting for Alnico's brittleness and machining limitations, suggesting simple shapes and avoiding small cross-sections, with recommendations for protective assemblies and coatings.

Stability and Temperature Effects
Alnico magnets are stable with temperature changes, with a reversible change of 0.02% per degree Centigrade, but heating above 1000°F can cause irreversible magnetic strength loss. External magnetic fields may require stabilization.

Ordering Information
Ordering instructions emphasize detailed inquiries for accurate processing, encouraging custom design requests and providing contact information for Arnold Engineering.

Warranty and Customer Service
A limited warranty statement outlines conditions for repair or replacement of defective products, with customer service contact information and instructions for inquiries and quotations.

Catalog excerpts

Cast 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 Recoil B/H @ Maximum Product Bd x Hd Induction Br Magnetizing Field Force Hc Permeability (BdHd) Max. Energy Product Typical Demagnetization Curves 03 Demagnetizing Field ARNOLD MAGNETIC TECHNOLOGIES

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Electrical Resistivity Tensile Strength Transverse Modulus of Rupture Coefficient of Thermal Expansion Temperature Effects Alnico 3 ARNOLD MAGNETIC TECHNOLOGIES

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Magnetic and Physical Properties (Typical Values) Permeance Coefficient Induction at Max. Energy Residual Required Coersive Recoil B/H @ Maximum Product Bd x Hd Induction Br Magnetizing Field Force Hc Permeability (BdHd) Max. Energy Product Alnico 5 Alnico 5cc Alnico 6 Typical Demagnetization Curves ARNOLD MAGNETIC TECHNOLOGIES

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Alnico 5, 5cc, 6 & ArKomax® 800, 800 Hi-Hc Magnetic and Physical Properties (Typical Values) Electrical Resistivity Transverse Modulus of Rupture Tensile Strength Coefficient of Thermal Expansion Temperature Effects Alnico 5 % Reversible Irreversible Reversible Irreversible Reversible Irreversible

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Magnetic and Physical Properties (Typical Values) Permeance Coefficient Induction at Max. Energy Residual Required Coersive Recoil B/H @ Maximum Product Bd x Hd Induction Br Magnetizing Field Force Hc Permeability (BdHd) Max. Energy Product Alnico 8B Alnico 8HE Alnico 8H Alnico 9 Typical Demagnetization Curves ARNOLD MAGNETIC TECHNOLOGIES

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Alnico 8B, 8HE, 8H, 9 Magnetic and Physical Properties (Typical Values) Electrical Resistivity Transverse Modulus of Rupture Coefficient of Thermal Expansion Tensile Strength Temperature Effects Alnico 8HE Reversible Irreversible Reversible Irreversible Reversible Irreversible

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ARNOLDMAGNETIC TECHNOLOGIES

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Horseshoe Magnets Curved-Field Magnets ARNOLD MAGNETIC TECHNOLOGIES

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The holding force values listed are typical under ideal conditions; i.e. ground pole faces in direct contact with a smooth steel surface. Separator Magnets DIMENSIONS HOLDING ARNOLD MAGNETIC TECHNOLOGIES

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Channel Bars The lengths listed for bar magnets are maximum as cast lengths. Shorter lengths may be cut and ground to size. The holding force values listed are typical under ideal conditions; i.e. ground pole faces in direct contact with a smooth steel surface. ARNOLD MAGNETIC TECHNOLOGIES

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The high coercive force and relatively high energy product of Alnico 8 offer distinct advantages over other permanent magnet materials in applications where a magnet must withstand strong demagnetizing fields and the space factor is limited. CAT. NO. 8B472 8B473 8B474 8B475 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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For 24-hour turn-around on quotations: MAIL TO: FAX TO: 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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