Round Neodymium Disc Magnet 20 x 3mm

The 20 x 3mm N38 Neodymium Disc Magnet is a powerful rare earth permanent magnet designed for applications requiring strong magnetic holding force in a slim, compact design. Manufactured from high-performance Neodymium Iron Boron (NdFeB), this round magnet offers excellent magnetic strength, making it ideal for electronics, industrial applications, magnetic mounting, DIY projects and general-purpose holding applications.

With a 20mm diameter, 3mm thickness and a rated pulling force of 3.92kg, this N38 grade neodymium magnet delivers impressive holding strength relative to its size. Its thin disc profile makes it particularly suitable for applications where installation space is limited but a reliable magnetic connection is required.

The magnet features a triple-layer Nickel-Copper-Nickel (Ni-Cu-Ni) coating, providing a smooth silver finish and improved resistance to corrosion under normal indoor conditions. With a maximum operating temperature of 80°C, it is suitable for a wide range of commercial, industrial and hobby applications.

Key Features

• Strong Magnetic Holding Force: Rated pulling force of 3.92kg under ideal testing conditions.

• Slim Disc Design: 20mm diameter x 3mm thickness, ideal for low-profile magnetic mounting applications.

• N38 Grade Neodymium: High-strength rare earth magnet offering excellent magnetic performance.

• Nickel-Plated Finish: Triple-layer Ni-Cu-Ni coating for improved corrosion resistance and durability.

• Permanent Magnet: Maintains its magnetic properties without requiring an external power source.

• Axial Magnetisation: Magnetic poles are located on the two flat circular faces.

• Maximum Operating Temperature: Suitable for operating temperatures up to 80°C.

• Versatile Applications: Ideal for magnetic closures, electronics, industrial fixtures, crafts and DIY projects.

Product Specifications

• Magnet Type: Neodymium Rare Earth Magnet (NdFeB)

• Grade: N38

• Shape: Round / Disc

• Diameter: 20mm

• Thickness: 3mm

• Dimensions: 20 x 3mm

• Pulling Force: 3.92kg (rated)

• Coating: Nickel-Copper-Nickel (Ni-Cu-Ni)

• Colour: Silver

• Magnetisation Direction: Axial (through the thickness)

• Maximum Operating Temperature: 80°C

• Dimensional Tolerance: ±0.1mm

• Quantity: 1 Piece

Applications

The 20 x 3mm neodymium disc magnet is suitable for a wide range of electronic, industrial, household and hobby applications, including:

• Electronics: Magnetic sensors, reed switches, actuators and electronic assemblies.

• Magnetic Closures: Cabinet doors, storage boxes, access panels and removable covers.

• 3D Printing Projects: Embedded magnets for custom enclosures, magnetic mounts, removable panels and printed assemblies.

• DIY and Hobby Projects: Custom magnetic fixtures, prototypes, model making and creative projects.

• Industrial Applications: Magnetic positioning, holding mechanisms, fixtures and equipment assemblies.

• Workshop Organisation: Magnetic tool holders, organisers and mounting solutions.

• Arts and Crafts: Magnetic displays, signage, decorations and handmade products.

• Automation Projects: Magnetic triggering, positioning and detection systems.

Important Handling and Safety Information

• Neodymium magnets are extremely strong for their size and should be handled carefully to prevent pinching injuries.

• These magnets are brittle and may crack, chip or shatter if dropped or allowed to collide forcefully with other magnets or metal surfaces.

• When separating stacked magnets, slide them apart rather than pulling them directly away from each other.

• Do not drill, cut, grind or machine neodymium magnets, as they may shatter and machining dust can present a fire hazard.

• Avoid prolonged exposure to moisture or corrosive environments, particularly if the nickel coating becomes damaged.

• Do not expose the magnet to temperatures above 80°C, as excessive heat may cause permanent loss of magnetic strength.

• Keep away from pacemakers, sensitive electronic equipment and magnetic storage devices.

• The nickel coating may cause skin irritation in individuals with nickel allergies.

• Keep out of reach of children and pets. Swallowed magnets can cause serious internal injuries and require immediate medical attention.

Please Note: The rated 3.92kg pulling force represents an ideal direct-pull measurement against a suitable thick, flat steel surface. Actual holding strength may vary depending on the mounting surface, material thickness, air gap, pulling direction and operating conditions. Sliding or shear holding force is generally lower than direct pulling force.

Package Includes: 1 x Round Neodymium Disc Magnet 20 x 3mm – N38.