3" x 1/2" N42 Neodymium Disc Magnets – Strong Rare Earth Magnets
Quick Facts
| Attribute |
Value |
| Magnet Type |
Neodymium Rare Earth Disc Magnet |
| Grade |
N42 |
| Shape |
Disc |
| Diameter |
3" (76.2 mm) |
| Thickness |
1/2" (0.500" / 12.7 mm) |
| Pull Force |
Approximately 165 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 high magnetic force, proper handling and safety precautions are recommended.
Quick Answers
| Question |
Answer |
| How strong is this magnet? |
Approximately 165 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? |
Industrial fixtures, magnetic separators, manufacturing equipment, robotics, engineering projects, scientific applications, and heavy-duty magnetic mounting. |
Product Overview
These 3" x 1/2" N42 Neodymium Disc Magnets are engineered for applications requiring exceptional holding power across a large magnetic surface. The 3-inch diameter provides extensive contact with ferromagnetic materials, while the 1/2-inch thickness creates a powerful magnetic field capable of producing approximately 165 pounds of pull force under ideal conditions. Their large size makes them ideal for industrial, commercial, and engineering applications where maximum coverage and dependable strength are required.
Manufactured from premium N42 grade NdFeB (Neodymium-Iron-Boron), these magnets offer significantly greater magnetic performance than N40, N38, and N35 grades. They are commonly used in magnetic fixtures, industrial tooling, magnetic separators, robotics, manufacturing equipment, scientific research, and custom engineering projects where reliable magnetic force is essential.
Each magnet is finished with a durable Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer coating that provides excellent resistance to corrosion, scratches, and chipping while maintaining a smooth, polished appearance. Manufactured in ISO-certified facilities, these magnets deliver consistent quality, long-lasting durability, and dependable performance.
What Is a Neodymium Disc Magnet?
A neodymium disc magnet is a permanent NdFeB (Neodymium-Iron-Boron) magnet made from an alloy of neodymium, iron, and boron. Neodymium magnets are the strongest commercially available permanent magnets and are widely used throughout manufacturing, robotics, engineering, automation, scientific equipment, motors, generators, and industrial machinery.
This magnet is magnetized through its 1/2-inch thickness (axially magnetized), placing the north and south poles on the two flat circular faces. This magnetic orientation maximizes holding power against steel surfaces, making disc magnets ideal for magnetic mounting, fixtures, and high-strength industrial applications.
Neodymium magnets are also commonly known as Neo magnets, NdFeB magnets, NIB magnets, or super magnets.
How Strong Is This Magnet?
This 3" x 1/2" N42 disc magnet delivers approximately 165 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 distributes magnetic force across a broad surface while maintaining excellent holding power for demanding applications.
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 |
3" (76.2 mm) |
| Thickness |
1/2" (12.7 mm) |
| Pull Force |
Approximately 165 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 (3" × 1/2") |
Industrial mounting, magnetic fixtures, machinery, and engineering systems |
Applications by Industry
| Industry |
Common Uses |
| Manufacturing |
Heavy-duty fixtures & jigs |
| Industrial |
Magnetic separators & machinery |
| Robotics |
Positioning & automation |
| Engineering |
Product development & prototypes |
| Scientific |
Laboratory equipment |
| DIY |
Workshop projects and custom fabrication |
Common Questions About This Magnet
What is the pull force?
This magnet provides approximately 165 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 1/2-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 magnetic strength and holding power
- Precision manufacturing
- Excellent corrosion resistance
- Competitive pricing
- Bulk discounts available
- Fast shipping
- Trusted by manufacturers, engineers, educators, researchers, and DIY professionals worldwide
