1" x 1/2" N42 Countersunk Neodymium Disc Magnets – Rare Earth Magnets for #8 & #10 Flat Head Screws
Quick Facts
| Attribute |
Value |
| Magnet Type |
Neodymium Rare Earth Countersunk Disc Magnet |
| Grade |
N42 |
| Shape |
Disc with Dual-Sided Countersunk Center Hole |
| Diameter |
1" (25.4 mm) |
| Thickness |
1/2" (0.500" / 12.7 mm) |
| Countersunk Hole |
0.365" x 0.195", 90° (Both Sides) |
| Compatible Screw |
#8 or #10 Flat Head Screw |
| Pull Force |
Over 54 lbs* |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel (Ni-Cu-Ni) Triple Layer |
| Magnetization |
Through Thickness |
| Br Max |
13,200 Gauss |
| Certification |
ISO Certified |
*Note: Actual pull force may vary depending on the application, contact surface, steel thickness, and mounting method. Testing in your specific application is recommended.
Quick Answers
| Question |
Answer |
| How strong is this magnet? |
Approximately 54 lbs of pull force under ideal conditions. |
| What is this magnet made of? |
NdFeB (Neodymium-Iron-Boron) rare earth material. |
| Is N42 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 humid environments. |
| What is it commonly used for? |
Heavy-duty mounting, woodworking, industrial fixtures, machinery, magnetic doors, equipment, and DIY projects. |
Product Overview
These 1" x 1/2" N42 Countersunk Neodymium Disc Magnets combine exceptional holding power with versatile mechanical mounting. The 1-inch diameter provides a large magnetic contact surface, while the 1/2-inch thickness creates a deep magnetic field capable of producing over 54 pounds of pull force under ideal conditions.
Each magnet features a precision-machined 0.365" x 0.195" 90° dual-sided tapered countersunk center hole, allowing installation with either #8 or #10 flat head screws. Because the countersink is machined on both sides, the magnet can be mounted with either face against the mounting surface, providing greater installation flexibility and maintaining a flush screw head.
Manufactured from premium N42 grade NdFeB (Neodymium-Iron-Boron), these magnets deliver dependable magnetic performance for industrial, commercial, and heavy-duty applications. The durable Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer coating provides excellent resistance to corrosion, scratches, and chipping while maintaining a smooth, polished finish.
What Is a Countersunk Neodymium Disc Magnet?
A countersunk neodymium disc magnet is a permanent NdFeB (Neodymium-Iron-Boron) magnet with a precision-machined center hole designed to accept flat head screws. This allows the magnet to be securely fastened without adhesives while keeping the screw head recessed below the magnet surface.
This model features a dual-sided 90° countersunk hole, allowing installation from either side of the magnet. It is magnetized through its thickness, placing the north and south poles on the two flat circular faces.
Neodymium magnets are also commonly known as Neo magnets, NdFeB magnets, NIB magnets, or super magnets.
How Strong Is This Magnet?
This 1" x 1/2" N42 countersunk disc magnet provides over 54 pounds of pull force under ideal laboratory conditions using a thick, clean steel surface.
Actual holding force depends on:
- Surface material
- Steel thickness
- Contact area
- Air gap
- Mounting method
- Environmental conditions
For maximum performance, mount the magnet securely using a #8 or #10 flat head screw and use it against a clean, flat steel surface.
Note: Pull force values are estimates based on ideal laboratory conditions. Actual performance should always be verified for your specific application.
Technical Specifications
| Specification |
Value |
| Magnet Type |
Neodymium Rare Earth Countersunk Disc Magnet |
| Grade |
N42 |
| Shape |
Disc with Dual-Sided Countersunk Center Hole |
| Diameter |
1" (25.4 mm) |
| Thickness |
1/2" (0.500" / 12.7 mm) |
| Countersunk Hole |
0.365" x 0.195", 90° (Both Sides) |
| Compatible Screw |
#8 or #10 Flat Head Screw |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel Triple Layer |
| Magnetization |
Through Thickness |
| Pull Force |
Over 54 lbs* |
| Br Max |
13,200 Gauss |
| Certification |
ISO Certified |
Nickel-Copper-Nickel Triple-Layer Coating
Every magnet features a Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer coating for superior durability and corrosion resistance.
Benefits
- Excellent scratch resistance
- Superior resistance to chipping and cracking
- Outstanding corrosion protection
- Smooth, polished metallic finish
- Long-lasting durability for industrial and commercial applications
Magnet Grade Comparison
| Grade |
Relative Strength |
Typical Applications |
| N35 |
Standard |
General-purpose magnets |
| N38 |
Moderate |
Consumer products |
| N40 |
High |
Industrial applications |
| N42 |
Higher |
Engineering, manufacturing, woodworking |
| N52 |
Maximum |
High-performance industrial applications |
Disc Magnet Size Comparison
| Size |
Typical Use |
| Small |
Crafts and lightweight mounting |
| Medium |
General-purpose magnetic fixtures |
| 1" x 1/2" Countersunk |
Heavy-duty mounting, woodworking, industrial equipment |
| Large |
Maximum-strength industrial installations |
Applications by Industry
| Industry |
Common Uses |
| Manufacturing |
Fixtures, jigs, magnetic assemblies |
| Woodworking |
Cabinet doors, hidden catches, furniture |
| Industrial |
Equipment mounting, removable panels, machinery |
| Construction |
Screw-mounted magnetic holders |
| Automation |
Positioning and magnetic retention |
| DIY & Makers |
Workshop organization, custom builds, storage systems |
Common Questions About This Magnet
What is the pull force?
This magnet provides over 54 pounds of pull force under ideal testing conditions.
What size screws fit this magnet?
The 0.365" x 0.195" 90° countersunk hole is designed to accommodate #8 and #10 flat head screws.
Why is the countersunk hole on both sides?
The dual-sided countersink allows the magnet to be mounted from either face while keeping the screw head flush with the surface, offering greater installation flexibility.
Is N42 stronger than N35 magnets?
Yes. N42 delivers significantly greater magnetic strength and holding power than N35 magnets of the same dimensions.
Can this magnet 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 occur over time.
Can it be used outdoors?
Yes. However, additional sealing is recommended for long-term outdoor, marine, or high-humidity applications.
What direction is it magnetized?
This magnet is magnetized through its 1/2-inch thickness, 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 large quantity orders.
Safety Notice: Neodymium magnets are extremely powerful and can cause pinch injuries or damage electronic devices if handled improperly. Always review and follow appropriate magnet safety guidelines before handling or installation.
Why Buy From Super Magnet Store?
- Premium N42 NdFeB rare earth magnets
- ISO-certified quality
- Precision-machined dual-sided countersunk hole
- Compatible with #8 and #10 flat head screws
- Durable Nickel-Copper-Nickel triple-layer coating
- Excellent corrosion resistance
- Consistent magnetic performance
- Precision manufacturing for reliable results
- Competitive wholesale pricing
- Bulk discounts available
- Trusted by manufacturers, engineers, woodworkers, and DIY professionals worldwide
