40x20x3mm Square Block Heavy Duty Neodymium Magnets

The 40x20x3mm Square Block Neodymium Magnet is a powerful rare-earth magnet designed for applications requiring strong magnetic force in a compact size. Manufactured using NdFeB (Neodymium Iron Boron) material, these magnets provide exceptional holding strength and durability, making them suitable for industrial, DIY, scientific, and electronics projects.

With its slim rectangular block design, this magnet is ideal for mounting, holding, sensing, magnetic separation, and creative engineering applications.

Key Features of 40x20x3mm Neodymium Block Magnets

• High Magnetic Strength: Made from powerful Neodymium (NdFeB) material for superior holding force
• Compact Block Design: Slim rectangular shape for versatile installation in tight spaces
• Heavy Duty Holding Force: Strong attraction capability despite small size
• Nickel-Coated Surface: Provides corrosion resistance and smooth metallic finish
• Multi-Purpose Usage: Suitable for industrial, electronic, and DIY applications
• Precision Manufactured: Uniform magnetic field and consistent dimensions for reliable performance
• Long-Lasting Performance: Retains magnetism for many years under normal conditions

Technical Specifications

• Magnet Type: Neodymium Block Magnet
• Material: NdFeB (Neodymium Iron Boron)
• Shape: Rectangular / Square Block
• Dimensions: 40mm x 20mm x 3mm
• Magnetization Direction: Through thickness (3mm side)
• Coating: Nickel-Copper-Nickel (Ni-Cu-Ni)
• Grade: Typically N35 to N52 (varies by model)
• Color: Silver metallic finish
• Operating Temperature: Usually up to 80°C

How Neodymium Block Magnets Work

Neodymium magnets generate a strong permanent magnetic field due to aligned magnetic domains within the NdFeB material. This unique composition creates exceptional magnetic strength that far surpasses traditional ferrite magnets.

• Opposite poles attract with powerful force
• Similar poles repel effectively
• Magnetic force can hold, lift, or detect ferromagnetic objects without external power

Their high energy density makes them much stronger than ordinary ferrite magnets, providing maximum holding power in minimal space.

Applications for 40x20x3mm Neodymium Magnets

• DIY and engineering projects requiring strong magnetic force
• Magnetic holders and latches for doors and cabinets
• Robotics and automation systems
• Hall effect and proximity sensing applications
• Crafts and model making
• Industrial mounting applications
• Science experiments and educational demonstrations
• Speaker and motor assemblies

Advantages of Heavy Duty Neodymium Block Magnets

• Extremely strong magnetic force in compact size
• Compact and lightweight design for easy installation
• Durable nickel-plated surface for long-term use
• Long magnetic lifespan with minimal degradation
• Suitable for precision applications requiring consistent performance

Usage Tips and Best Practices

• Handle carefully as strong magnets can snap together suddenly and cause injury
• Keep away from electronic devices, credit cards, and pacemakers to avoid interference
• Avoid dropping or impacting magnets as they can crack or chip despite metal appearance
• Store with spacers between magnets for safe handling and to prevent damage
• Do not expose to high temperatures beyond rated limit to maintain magnetic strength

Safety Information

• Strong magnets can pinch fingers if handled improperly – use caution when separating
• Keep out of reach of children due to pinch hazard and swallowing risk
• Fragile despite metal appearance – avoid collisions and impacts

Note: Images are for Illustration Purposes Only.