Neodymium Magnets with One Countersunk Hole 1" x 1/2" x 1/4" Thick Strong Rare Earth Bar Magnets
Quick Facts
| Attribute |
Value |
| Magnet Type |
Neodymium Rare Earth Bar Magnet with Countersunk Hole |
| Grade |
N42 |
| Shape |
Block / Bar |
| Length |
1" (25.4 mm) |
| Width |
1/2" (12.7 mm) |
| Height |
1/4" (6.35 mm) |
| Pull Force |
Over 21 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 21 lbs of pull force under ideal conditions. |
| Is N42 stronger than N35? |
Yes. N42 is stronger than N40, N38, and N35 grades. |
| What is this magnet made of? |
NdFeB rare earth material. |
| Can this magnet rust? |
The Nickel-Copper-Nickel coating helps resist corrosion, but moisture exposure or coating damage can eventually lead to rust. |
| What is it commonly used for? |
Screw-mounted fixtures, tool holders, cabinet closures, displays, magnetic latches, industrial assemblies, and DIY mounting projects. |
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 strong rare earth bar magnets provide reliable holding power, consistent performance, and long-term durability for industrial, commercial, and DIY applications.
This N42 neodymium bar magnet measures 1" x 1/2" x 1/4" and features one countersunk center hole. The hole is countersunk on both sides of the magnet, allowing a flat head screw to sit recessed from either direction. The countersunk hole measures 0.29" x 0.155" with an 82-degree taper and is designed to work with #6 flat head screws.
With a pull force of over 21 lbs, this magnet is ideal for applications that require strong holding power and secure screw-mounted installation. The Nickel-Copper-Nickel triple-layer coating provides enhanced protection against corrosion and helps maintain durability during use.
What Is a Neodymium Block Magnet?
A neodymium block or bar magnet is a rectangular rare earth permanent magnet made from neodymium, iron, and boron (NdFeB). Block magnets provide strong holding force and a large contact surface, making them ideal for industrial, engineering, manufacturing, cabinetry, display, and DIY applications.
How Strong Is This Magnet?
This N42 neodymium countersunk bar magnet provides over 21 lbs of pull force under ideal conditions. Actual holding strength depends on surface material, steel thickness, air gaps, screw installation, alignment, and application design. With a Br Max rating of 13,200 Gauss, it delivers strong magnetic performance in a compact, mountable block design.
Technical Specifications
| Specification |
Value |
| Product Name |
N42 Neodymium Bar Magnet with Countersunk Hole |
| Material |
Neodymium Iron Boron (NdFeB) |
| Grade |
N42 |
| Shape |
Block / Bar |
| Length |
1" (25.4 mm) |
| Width |
1/2" (12.7 mm) |
| Thickness |
1/4" (6.35 mm) |
| Hole Type |
One Dual-Sided Countersunk Hole |
| Countersunk Hole Size |
0.29" x 0.155" |
| Countersink Angle |
82 Degrees |
| Compatible Screw |
#6 Flat Head Screw |
| Coating |
Nickel-Copper-Nickel Triple Layer |
| Magnetization Direction |
Through 1/4" Thickness |
| Pole Orientation |
On the 1" x 1/2" Surfaces |
| Pull Force |
Over 21 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 |
| Cabinetry |
Magnetic closures |
| Retail Displays |
Hidden mounting systems |
| Robotics |
Motion systems |
| Electronics |
Assemblies & sensors |
| DIY |
Custom mounted builds |
Common Questions About This Magnet
How much weight can this magnet hold?
This magnet provides over 21 lbs of pull force under ideal conditions. Actual holding strength depends on the mounting surface, screw installation, air gap, and application setup.
Is N42 stronger than N35?
Yes. N42 magnets offer significantly greater magnetic strength than N35, N38, and N40 magnets of the same size.
Can this magnet be used outdoors?
The Nickel-Copper-Nickel coating provides corrosion resistance, but additional protection is recommended for prolonged outdoor use.
Can it rust?
The protective nickel coating helps resist corrosion. However, scratched coatings, moisture exposure, or harsh environments can eventually cause 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 1" x 1/2" surfaces.
What screw fits the countersunk hole?
The 0.29" x 0.155" 82-degree tapered countersunk hole is designed to work with #6 flat head screws.
Do you offer wholesale pricing?
Yes. Contact Super Magnet Store for competitive volume pricing and wholesale discounts on neodymium magnets.
Safety Notice
Strong neodymium magnets can pinch fingers, chip, crack, or shatter if allowed to collide with metal objects or other magnets. 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
