N40 Neodymium Cylinder Magnet 1/4" x 1/4" Rare Earth Magnet
Quick Facts
| Attribute |
Value |
| Magnet Type |
Neodymium Rare Earth Cylinder Magnet |
| Grade |
N40 |
| Shape |
Cylinder |
| Diameter |
1/4 inch (0.250") |
| Length |
1/4 inch (0.250") |
| Pull Force |
Approx. 5.1 lbs* |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel Triple Layer |
| Magnetization |
Through Length (Axially Magnetized) |
| Br Max |
12,900 Gauss |
| Certification |
ISO Certified |
Quick Answers
| Question |
Answer |
| How strong is this magnet? |
Approximately 5.1 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. N40 magnets provide greater magnetic strength than N35 magnets while maintaining excellent value for everyday applications. |
| Can it be used outdoors? |
Yes. The Nickel-Copper-Nickel triple-layer coating offers excellent corrosion resistance, although additional sealing is recommended for prolonged outdoor or marine environments. |
| What is it commonly used for? |
Alignment pins, magnetic closures, woodworking, embedded mounting, electronics, crafts, organization, and DIY projects. |
Product Overview
The N40 Neodymium Cylinder Magnet 1/4" x 1/4" is a versatile rare earth magnet that combines balanced dimensions with dependable magnetic performance. Measuring 1/4 inch in diameter and 1/4 inch in length, its symmetrical cylindrical shape fits neatly into drilled holes, molded components, and precision assemblies while providing reliable alignment and secure positioning.
Manufactured from premium N40 grade NdFeB (Neodymium-Iron-Boron), these cylinder magnets provide dependable holding power for woodworking, electronics, fixtures, magnetic closures, product assembly, and countless DIY applications. Their compact size makes them easy to handle while still delivering the magnetic strength needed for light to moderate-duty projects.
Each magnet is protected by a durable Nickel-Copper-Nickel triple-layer coating that provides outstanding resistance to corrosion, oxidation, and everyday wear. Compared to standard epoxy-coated magnets, the triple-layer nickel finish offers superior long-term durability while maintaining a smooth, polished appearance.
What Is a Neodymium Cylinder Magnet?
A neodymium cylinder magnet is a rod-shaped permanent magnet manufactured from neodymium, iron, and boron (NdFeB). The cylindrical design creates a deeper magnetic field than a similarly sized disc magnet, making these magnets ideal for embedded mounting, positioning systems, alignment pins, magnetic latches, and precision mechanical assemblies.
Their balanced proportions make them especially popular for installations in drilled holes, wood, plastic, resin, and custom-machined components where accurate positioning and dependable holding power are important.
How Strong Is This Magnet?
This N40 neodymium cylinder magnet generates approximately 5.1 pounds of pull force under ideal conditions against a thick, flat steel surface. Its balanced 1/4-inch diameter and 1/4-inch length provide an excellent combination of holding strength, stability, and ease of installation.
Actual pull force may vary depending on the application, contact surface, air gap, and mounting method. Because cylinder magnets have a relatively small contact surface, testing in your specific application is recommended.
Technical Specifications
| Property |
Specification |
| Material |
Neodymium (NdFeB) |
| Grade |
N40 |
| Shape |
Cylinder |
| Diameter |
0.250 inch (1/4") |
| Length |
0.250 inch (1/4") |
| Br Max |
12,900 Gauss |
| Pull Force |
Approx. 5.1 lbs* |
| Coating |
Nickel-Copper-Nickel Triple Layer |
| Magnetization |
Through Length (Axially Magnetized) |
| Certification |
ISO Certified |
Magnet Grade Comparison
| Grade |
Relative Strength |
Typical Applications |
| N35 |
Standard |
General purpose |
| N38 |
Moderate |
Consumer products |
| N40 |
High |
Industrial, woodworking, electronics |
| N42 |
Higher |
Engineering |
| N52 |
Maximum |
High-performance applications |
Cylinder Magnet Size Comparison
| Size |
Typical Use |
| Small |
Precision electronics, sensors, crafts |
| Medium |
Magnetic closures, woodworking, assemblies |
| Large |
Industrial fixtures and heavy-duty holding |
Applications by Industry
| Industry |
Common Uses |
| Manufacturing |
Fixtures, locating pins, assembly tooling |
| Robotics |
Positioning systems, sensors, actuators |
| Electronics |
Components, connectors, embedded devices |
| Education |
STEM projects and engineering demonstrations |
| DIY |
Woodworking, resin casting, hobby projects, organization |
Common Questions About This Magnet
What is the pull force?
This magnet provides approximately 5.1 pounds of pull force under ideal conditions. Actual holding force may vary depending on the application and contact surface.
Is N40 stronger than N35?
Yes. N40 provides greater magnetic strength than N35 magnets while offering an excellent balance of performance and affordability.
Can it rust?
Like all neodymium magnets, the core material can corrode if exposed. The Nickel-Copper-Nickel triple-layer coating provides superior protection against corrosion and everyday wear.
Can it be used outdoors?
Yes. For long-term outdoor or marine applications, additional sealing is recommended to maximize service life.
What direction is it magnetized?
This cylinder magnet is axially magnetized through its length, with the north and south poles located on the two circular ends.
Do you offer bulk discounts?
Yes. Super Magnet Store offers competitive wholesale pricing and quantity discounts for manufacturers, distributors, educational institutions, retailers, and OEM customers.
Why Buy From Super Magnet Store?
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Premium NdFeB rare earth magnets
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ISO-certified quality
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Durable Nickel-Copper-Nickel triple-layer coating
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Superior corrosion resistance
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Consistent magnetic performance
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Precision manufacturing tolerances
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Competitive wholesale pricing
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Bulk discounts available
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Fast shipping from a trusted magnet supplier
*Pull force is approximate. Because cylinder magnets have a relatively small contact surface, actual holding force may vary depending on the application, material thickness, surface finish, and air gap. Testing in your specific application is recommended.
