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SKU: ND078-2

Rare Earth Magnets 2.5 in x 1/8 in N42 Neodymium Disc

$ 23.00
$ 23.00

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2.5" x 1/8" N42 Neodymium Disc Magnets – Strong Rare Earth Magnets

Quick Facts

Attribute Value
Magnet Type Neodymium Rare Earth Disc Magnet
Grade N42
Shape Disc
Diameter 2.5" (63.5 mm)
Thickness 1/8" (0.125" / 3.18 mm)
Pull Force Approximately 30 lbs*
Material NdFeB (Neodymium-Iron-Boron)
Coating Nickel-Copper-Nickel (Ni-Cu-Ni) Triple Layer
Magnetization Through Thickness (Axially Magnetized)
Br Max 13,200 Gauss
Certification ISO Certified

*Note: Actual pull force may vary depending on the application, contact surface, steel thickness, air gap, and mounting method. Testing in your specific application is recommended.

Quick Answers

Question Answer
How strong is this magnet? Approximately 30 lbs of pull force under ideal conditions.
What is this magnet made of? NdFeB (Neodymium-Iron-Boron) rare earth material.
Is this stronger than N35 magnets? Yes. N42 provides greater magnetic strength than N40, N38, and N35 magnets of the same size.
Can it be used outdoors? Yes, but additional sealing is recommended for long-term outdoor or marine environments.
What is it commonly used for? Magnetic displays, signage, cabinet closures, industrial mounting, educational projects, product assemblies, and DIY applications.

Product Overview

These 2.5" x 1/8" N42 Neodymium Disc Magnets combine a large surface area with a slim profile, making them ideal for applications requiring broad magnetic coverage without adding excessive thickness. The 2.5-inch diameter provides excellent surface contact, while the 1/8-inch thickness delivers approximately 30 pounds of pull force under ideal conditions. Their low-profile design makes them perfect for flush installations, magnetic displays, and lightweight industrial mounting applications.

Manufactured from premium N42 grade NdFeB (Neodymium-Iron-Boron), these magnets provide substantially greater magnetic strength than N40, N38, and N35 grades. They are commonly used for display systems, magnetic fixtures, cabinetry, engineering projects, product assemblies, workshop organization, and custom fabrication where dependable holding power is required.

Each magnet is protected with a durable Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer coating, providing excellent resistance to corrosion, scratches, and chipping while maintaining a smooth, polished finish. Manufactured in ISO-certified facilities, these magnets deliver consistent quality and reliable long-term performance.

What Is a Neodymium Disc Magnet?

A neodymium disc magnet is a permanent NdFeB (Neodymium-Iron-Boron) magnet manufactured from an alloy of neodymium, iron, and boron. Neodymium magnets are the strongest commercially available permanent magnets and are widely used in manufacturing, engineering, robotics, electronics, signage, woodworking, and industrial equipment.

This magnet is magnetized through its 1/8-inch thickness (axially magnetized), placing the north and south poles on the two flat circular faces. This magnetic orientation provides maximum holding power against steel surfaces while maintaining a thin, space-saving design.

Neodymium magnets are also commonly known as Neo magnets, NdFeB magnets, NIB magnets, or super magnets.

How Strong Is This Magnet?

This 2.5" x 1/8" N42 disc magnet delivers approximately 30 pounds of pull force under ideal laboratory conditions using a thick, clean steel surface.

Actual holding force depends on several factors, including:

  • Surface material
  • Steel thickness
  • Contact area
  • Air gap
  • Mounting method
  • Environmental conditions

Its large diameter provides excellent surface coverage, while the slim profile allows for easy integration into projects where space is limited.

Note: Pull force values are estimates based on ideal laboratory conditions. Actual performance should always be verified for your intended application.

Technical Specifications

Specification Value
Magnet Type Neodymium Rare Earth Disc Magnet
Grade N42
Shape Disc
Diameter 2.5" (63.5 mm)
Thickness 1/8" (3.18 mm)
Pull Force Approximately 30 lbs*
Material NdFeB (Neodymium-Iron-Boron)
Coating Nickel-Copper-Nickel Triple Layer
Magnetization Through Thickness (Axially Magnetized)
Br Max 13,200 Gauss
Certification ISO Certified

Magnet Grade Comparison

Grade Relative Strength Typical Applications
N35 Standard General purpose
N38 Moderate Consumer products
N40 High Industrial
N42 Higher Engineering
N52 Maximum High-performance

Disc Magnet Size Comparison

Size Typical Use
Small Crafts & sensors
Medium General holding
Large (2.5" × 1/8") Signage, displays, cabinet mounting, industrial fixtures

Applications by Industry

Industry Common Uses
Manufacturing Fixtures & magnetic mounting
Retail Displays & signage
Electronics Product assemblies
Education STEM projects
Woodworking Cabinet closures & hidden mounts
DIY Home improvement & custom projects

Common Questions About This Magnet

What is the pull force?

This magnet provides approximately 30 pounds of pull force under ideal testing conditions.

Is N42 stronger than N35 magnets?

Yes. N42 delivers significantly greater magnetic strength and holding power than N35 magnets of the same dimensions.

Can it rust?

The Nickel-Copper-Nickel triple-layer coating provides excellent protection against corrosion. If the coating becomes damaged and moisture reaches the magnet, corrosion may occur over time.

Can it be used outdoors?

Yes. However, additional sealing is recommended for prolonged outdoor exposure, marine environments, or high-humidity conditions.

What direction is it magnetized?

This magnet is magnetized through its 1/8-inch thickness (axially magnetized), with the north and south poles located on the two flat circular faces.

Do you offer bulk discounts?

Yes. Contact Super Magnet Store for wholesale pricing and volume discounts on commercial, industrial, OEM, educational, and reseller orders.

Why Buy From Super Magnet Store?

  • Premium NdFeB rare earth magnets
  • ISO-certified quality
  • High-performance N42 magnetic grade
  • Durable Nickel-Copper-Nickel triple-layer coating
  • Consistent magnetic performance
  • Excellent corrosion resistance
  • Precision manufacturing
  • Competitive pricing
  • Bulk discounts available
  • Fast shipping
  • Trusted by manufacturers, engineers, educators, businesses, and DIY enthusiasts worldwide


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