1" x 3/16" N42 Countersunk Neodymium Disc Magnets – Rare Earth Magnets for #8 Flat Head Screws
Quick Facts
| Attribute |
Value |
| Magnet Type |
Neodymium Rare Earth Countersunk Disc Magnet |
| Grade |
N42 |
| Shape |
Disc with Countersunk Center Hole |
| Diameter |
1" (25.4 mm) |
| Thickness |
3/16" (0.1875" / 4.76 mm) |
| Countersunk Hole |
0.355" x 0.195", 82° (One Side) |
| Compatible Screw |
#8 Flat Head Screw |
| Pull Force |
Over 24 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 24 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? |
Cabinet doors, woodworking, magnetic fixtures, equipment mounting, industrial machinery, displays, and DIY projects. |
Product Overview
These 1" x 3/16" N42 Countersunk Neodymium Disc Magnets combine strong magnetic performance with the convenience of secure screw mounting. The 1-inch diameter provides a generous contact surface for dependable holding power, while the 3/16-inch thickness creates a deeper magnetic field than thinner magnets, delivering over 24 pounds of pull force under ideal conditions.
Each magnet features a precision-machined 0.355" x 0.195" 82° tapered countersunk center hole on one side, designed to fit a standard #8 flat head screw. The recessed hole allows the screw head to sit flush with the magnet surface, making these magnets ideal for cabinetry, woodworking, equipment mounting, industrial fixtures, and custom fabrication.
Manufactured from premium N42 grade NdFeB (Neodymium-Iron-Boron), these rare earth magnets provide reliable magnetic strength for demanding applications. A durable Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer coating protects against corrosion, scratches, and chipping while maintaining a smooth, polished metallic 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 accommodate a flat head screw. This allows the magnet to be securely fastened to wood, metal, plastic, or composite materials without adhesives.
This magnet is magnetized through its thickness, placing the north and south poles on the two flat circular faces. The single-sided countersunk hole creates a flush mounting surface while maintaining maximum magnetic contact on the opposite face.
Neodymium magnets are also commonly known as Neo magnets, NdFeB magnets, NIB magnets, or super magnets.
How Strong Is This Magnet?
This 1" x 3/16" N42 countersunk disc magnet delivers over 24 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
For maximum holding performance, install the magnet securely using a #8 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 Countersunk Center Hole |
| Diameter |
1" (25.4 mm) |
| Thickness |
3/16" (0.1875" / 4.76 mm) |
| Countersunk Hole |
0.355" x 0.195", 82° (One Side) |
| Compatible Screw |
#8 Flat Head Screw |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel Triple Layer |
| Magnetization |
Through Thickness |
| Pull Force |
Over 24 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, woodworking, 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, woodworking, manufacturing |
| 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 3/16" Countersunk |
Cabinetry, woodworking, equipment mounting, industrial fixtures |
| Large |
Heavy-duty industrial installations |
Applications by Industry
| Industry |
Common Uses |
| Manufacturing |
Magnetic fixtures, jigs, production equipment |
| Woodworking |
Cabinet doors, furniture, hidden catches |
| Construction |
Screw-mounted magnetic holders |
| Industrial |
Equipment mounting and removable access panels |
| Retail |
Displays, signage, exhibit fixtures |
| DIY & Makers |
Workshop organization, custom builds, storage systems |
Common Questions About This Magnet
What is the pull force?
This magnet provides over 24 pounds of pull force under ideal testing conditions.
What size screw fits this magnet?
The 0.355" x 0.195" 82° tapered countersunk hole is designed to fit a #8 flat head screw.
Why is the countersunk hole only on one side?
The single-sided countersink allows the screw head to sit flush with the magnet surface while preserving maximum magnetic contact on the opposite side.
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 the magnet is exposed to moisture, 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 3/16-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 follow recommended magnet safety guidelines during handling and installation.
Why Buy From Super Magnet Store?
- Premium N42 NdFeB rare earth magnets
- ISO-certified quality
- Stronger than N40, N38, and N35 magnets
- Precision-machined countersunk hole for #8 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
