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SKU: ND084

Strong Magnets 4 in x 1 in Neodymium Rare Earth Disc N42

$ 192.50
$ 192.50

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4" x 1" N42 Neodymium Disc Magnets – Heavy-Duty Rare Earth Magnets

Quick Facts

Attribute Value
Magnet Type Neodymium Rare Earth Disc Magnet
Grade N42
Shape Disc
Diameter 4" (101.6 mm)
Thickness 1" (25.4 mm)
Pull Force Approximately 590 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. Due to the extremely high magnetic force, proper handling and safety precautions are strongly recommended.

Quick Answers

Question Answer
How strong is this magnet? Approximately 590 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 significantly 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? Heavy-duty industrial fixtures, magnetic separators, manufacturing equipment, robotics, engineering projects, scientific research, and large magnetic assemblies.

Product Overview

These 4" x 1" N42 Neodymium Disc Magnets are engineered for industrial applications that demand exceptional holding power across a large magnetic surface. The 4-inch diameter provides maximum contact area with ferromagnetic materials, while the 1-inch thickness generates an extremely powerful magnetic field capable of producing approximately 590 pounds of pull force under ideal conditions. Their large size makes them ideal for heavy-duty industrial machinery, magnetic lifting systems, magnetic separators, and engineering applications where dependable performance is essential.

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 in industrial tooling, robotics, manufacturing equipment, automation systems, research laboratories, and custom engineering projects requiring reliable, high-strength magnetic performance.

Each magnet features 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, superior durability, and dependable 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 industrial manufacturing, robotics, automation, electric motors, generators, scientific research, and heavy-duty engineering applications.

This magnet is magnetized through its 1-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 and makes disc magnets ideal for industrial fixtures, magnetic assemblies, and high-performance engineering systems.

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

How Strong Is This Magnet?

This 4" x 1" N42 disc magnet delivers approximately 590 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

Because of its extremely powerful magnetic field, this magnet should be handled with care. Improper handling can result in severe pinch injuries or damage to nearby tools, equipment, or electronic devices.

Note: Pull force values are measured under 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 4" (101.6 mm)
Thickness 1" (25.4 mm)
Pull Force Approximately 590 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 Industrial mounting
Extra Large (4" × 1") Heavy machinery, magnetic separators, lifting fixtures, and industrial engineering

Applications by Industry

Industry Common Uses
Manufacturing Heavy-duty fixtures & jigs
Industrial Magnetic separators & machinery
Robotics High-force positioning systems
Engineering Product development & specialized equipment
Scientific Laboratory research & testing
Energy Motors, generators & magnetic assemblies

Common Questions About This Magnet

What is the pull force?

This magnet provides approximately 590 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 eventually occur.

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-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
  • Exceptional industrial holding power
  • Precision manufacturing
  • Excellent corrosion resistance
  • Competitive pricing
  • Bulk discounts available
  • Fast shipping
  • Trusted by manufacturers, engineers, researchers, industrial professionals, and DIY enthusiasts worldwide


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