Neodymium Magnets N42 Strong 3/4" x 3/4" x 1/4" Thick with Countersunk Center Hole NdFeB Block Rare Earth Magnets
Quick Facts
| Attribute |
Value |
| Magnet Type |
Neodymium Rare Earth Block Magnet with Countersunk Hole |
| Grade |
N42 |
| Shape |
Block |
| Length |
3/4" (19.05 mm) |
| Width |
3/4" (19.05 mm) |
| Height |
1/4" (6.35 mm) |
| Pull Force |
Over 20 lbs |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel (Ni-Cu-Ni) |
| Magnetization |
Through 1/4" Thickness |
| Br Max |
13,200 Gauss |
| Certification |
ISO Certified |
Quick Answers
| Question |
Answer |
| How strong is this magnet? |
Over 20 lbs of pull force under ideal conditions. |
| Is N42 stronger than N35? |
Yes. N42 is significantly stronger than N35, N38, and N40 grades. |
| What is this magnet made of? |
NdFeB (Neodymium-Iron-Boron) rare earth material. |
| Can this magnet rust? |
The Nickel-Copper-Nickel coating helps protect against corrosion, but prolonged moisture exposure or coating damage may eventually lead to corrosion. |
| What is it commonly used for? |
Screw-mounted fixtures, cabinetry, displays, industrial tooling, magnetic closures, robotics, and engineering assemblies. |
Product Overview
Neodymium magnets are the world's strongest commercially available permanent magnets. Super Magnet Store offers premium-quality N42 neodymium magnets manufactured to stringent quality standards using advanced production technology. These magnets deliver exceptional holding power, reliable performance, and long-term durability for industrial and commercial applications.
This N42 neodymium block magnet measures 3/4" x 3/4" x 1/4" and features a dual-sided countersunk center hole designed for secure screw mounting. The countersunk hole measures 0.25" x 0.125" with a 90-degree taper and is compatible with #4 flat head screws. The dual-sided design allows the screw head to be recessed from either side of the magnet.
Producing over 20 lbs of pull force under ideal conditions, this magnet is ideal for mounting applications that require strong holding power and easy installation. The durable Nickel-Copper-Nickel triple-layer coating provides excellent corrosion resistance and long service life.
What Is a Neodymium Block Magnet?
A neodymium block magnet is a rectangular rare earth permanent magnet made from neodymium, iron, and boron (NdFeB). Block magnets provide exceptional holding force and a large contact surface area, making them ideal for manufacturing, engineering, robotics, automation, cabinetry, displays, and custom magnetic assemblies.
How Strong Is This Magnet?
This N42 neodymium countersunk block magnet generates over 20 lbs of pull force under ideal conditions. Actual holding strength depends on steel thickness, surface condition, air gaps, mounting method, and application design. With a BrMax rating of 13,200 Gauss, it delivers dependable magnetic performance for mounting and fixture applications.
Technical Specifications
| Specification |
Value |
| Product Name |
N42 Neodymium Block Magnet with Countersunk Center Hole |
| Material |
Neodymium Iron Boron (NdFeB) |
| Grade |
N42 |
| Shape |
Block |
| Length |
3/4" (19.05 mm) |
| Width |
3/4" (19.05 mm) |
| Thickness |
1/4" (6.35 mm) |
| Hole Type |
Dual-Sided Tapered Countersunk Center Hole |
| Countersunk Hole Size |
0.25" x 0.125" |
| Countersink Angle |
90 Degrees |
| Compatible Screw |
#4 Flat Head Screw |
| Coating |
Nickel-Copper-Nickel Triple Layer |
| Magnetization Direction |
Through 1/4" Thickness |
| Pull Force |
Over 20 lbs |
| Br Max |
13,200 Gauss |
| Certification |
ISO Certified |
| Operating Temperature |
Up to 176°F (80°C) |
Note: Pull force is an estimate only and should be tested for your specific application.
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 |
Block Magnet Size Comparison
| Size |
Typical Applications |
| Small Blocks |
Electronics |
| Medium Blocks |
Fixtures |
| Large Blocks |
Industrial assemblies |
Applications by Industry
| Industry |
Common Uses |
| Manufacturing |
Fixtures & tooling |
| Engineering |
Product development |
| Robotics |
Motion systems |
| Cabinetry |
Magnetic closures |
| Retail Displays |
Hidden mounting systems |
| Electronics |
Assemblies & sensors |
| DIY |
Custom builds |
Common Questions About This Magnet
How much weight can this magnet hold?
This magnet provides over 20 lbs of pull force under ideal conditions. Actual holding capacity depends on mounting conditions and the steel surface used.
Is N42 stronger than N35?
Yes. N42 magnets provide substantially greater magnetic energy and holding force than N35 magnets of the same dimensions.
Can this magnet be used outdoors?
The Nickel-Copper-Nickel coating offers corrosion resistance, but additional protection is recommended for prolonged outdoor exposure.
Can it rust?
The protective nickel coating helps resist corrosion; however, moisture exposure and coating damage can eventually result in rust.
What direction is it magnetized?
This magnet is magnetized through the 1/4-inch thickness, with the north and south poles located on the two 3/4" x 3/4" faces.
What screw fits the countersunk hole?
The 0.25" x 0.125" 90-degree countersunk hole is designed for use with #4 flat head screws.
Do you offer wholesale pricing?
Yes. Contact Super Magnet Store for volume discounts and wholesale pricing on neodymium magnets.
Safety Notice
Strong neodymium magnets can pinch fingers, chip, crack, or shatter if allowed to collide. Keep away from children, pacemakers, sensitive electronics, and magnetic storage devices. Please read magnet safety information before purchase and use.
Why Buy From Super Magnet Store?
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Premium NdFeB rare earth magnets
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Consistent magnetic performance
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ISO-certified manufacturing
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Competitive pricing
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Wholesale discounts available
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Superior quality and performance guaranteed
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Secure countersunk mounting design
