7/8" x 1/4" N52 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 |
N52 |
| Shape |
Disc with Countersunk Center Hole |
| Diameter |
7/8" (0.875" / 22.23 mm) |
| Thickness |
1/4" (0.250" / 6.35 mm) |
| Countersunk Hole |
0.355" x 0.195", 82° (Both Sides) |
| 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 |
14,400 Gauss |
| Certification |
ISO Certified |
*Note: Actual pull force may vary depending on the application, mounting surface, steel thickness, and installation 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 N52 stronger than N42 magnets? |
Yes. N52 provides greater magnetic strength than N50, N48, N45, N42, and lower grades. |
| Can it be used outdoors? |
Yes, but additional sealing is recommended for long-term outdoor or marine environments. |
| What is it commonly used for? |
Screw-mounted fixtures, cabinetry, woodworking, displays, industrial equipment, magnetic doors, and DIY projects. |
Product Overview
These 7/8" x 1/4" N52 Countersunk Neodymium Disc Magnets combine exceptional holding power with convenient screw mounting for secure, permanent installations. The 7/8-inch diameter provides a generous contact surface, while the 1/4-inch thickness delivers a powerful magnetic field capable of holding demanding loads.
Each magnet features a 0.355" x 0.195" 82° countersunk hole on both sides, making it compatible with #8 flat head screws. The dual-sided countersink allows the magnet to be installed with either pole facing outward, offering greater flexibility during installation.
Manufactured from premium N52 grade NdFeB (Neodymium-Iron-Boron), these magnets provide some of the strongest magnetic performance available in a standard neodymium magnet. Each magnet is finished with a durable Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer coating for outstanding corrosion resistance and long-lasting durability.
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 a flat head screw. This allows the magnet to be securely fastened to wood, metal, plastic, or other materials without adhesives.
These magnets are magnetized through their thickness, placing the north and south poles on the two flat circular faces. Their combination of high magnetic strength and mechanical mounting makes them ideal for permanent installations in industrial, commercial, and residential applications.
Neodymium magnets are also commonly known as Neo magnets, NdFeB magnets, NIB magnets, or super magnets.
How Strong Is This Magnet?
This 7/8" x 1/4" N52 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
- Screw installation
- Environmental conditions
For maximum holding performance, mount the magnet securely against a rigid surface and use it with a clean, flat steel contact surface.
Note: Pull force values are estimates based on ideal laboratory conditions. Actual performance should always be verified for your intended application.
Technical Specifications
| Specification |
Value |
| Magnet Type |
Neodymium Rare Earth Countersunk Disc Magnet |
| Grade |
N52 |
| Shape |
Disc with Countersunk Center Hole |
| Diameter |
7/8" (0.875" / 22.23 mm) |
| Thickness |
1/4" (0.250" / 6.35 mm) |
| Countersunk Hole |
0.355" x 0.195", 82° (Both Sides) |
| 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 |
14,400 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 indoor and industrial applications
Magnet Grade Comparison
| Grade |
Relative Strength |
Typical Applications |
| N35 |
Standard |
General-purpose magnets |
| N40 |
High |
Industrial applications |
| N42 |
Higher |
Engineering and manufacturing |
| N45 |
Very High |
Heavy-duty fixtures |
| N48 |
Extremely High |
Precision industrial equipment |
| N52 |
Maximum |
Maximum-strength mounting, robotics, and industrial applications |
Disc Magnet Size Comparison
| Size |
Typical Use |
| Small |
Crafts and lightweight mounting |
| Medium |
General-purpose magnetic fixtures |
| 7/8" x 1/4" Countersunk |
Screw-mounted cabinetry, industrial fixtures, woodworking, equipment mounting |
| Large |
Heavy-duty industrial installations |
Applications by Industry
| Industry |
Common Uses |
| Manufacturing |
Magnetic fixtures and production equipment |
| Woodworking |
Cabinet doors, hidden fasteners, furniture |
| Construction |
Screw-mounted magnetic holders |
| Retail |
Display fixtures and signage |
| Marine & Automotive |
Removable panels and equipment mounting |
| DIY & Makers |
Workshop projects, storage systems, custom builds |
Common Questions About This Magnet
What is the pull force?
This magnet delivers over 24 pounds of pull force under ideal testing conditions.
What size screw fits this magnet?
The 0.355" x 0.195" 82° countersunk hole is designed for a #8 flat head screw.
Why is the countersunk hole on both sides?
The dual-sided countersink allows the magnet to be installed with either magnetic pole facing outward, providing greater installation flexibility.
Is N52 stronger than N42 magnets?
Yes. N52 is the highest commercially available neodymium grade and provides greater magnetic strength than N42 magnets of the same size.
Can this magnet rust?
Like all neodymium magnets, it contains iron and may corrode if the protective coating becomes damaged or exposed to moisture.
Can it be used outdoors?
Yes. However, additional sealing is recommended for long-term outdoor or marine environments.
What direction is it magnetized?
This magnet is magnetized through its 1/4-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: Neodymium magnets are extremely strong and should be handled with care. Review all magnet safety guidelines before installation and use.
Why Buy From Super Magnet Store?
- Premium N52 NdFeB rare earth magnets
- ISO-certified quality
- Maximum-strength N52 grade
- Dual-sided countersunk design for flexible installation
- Fits standard #8 flat head screws
- Durable Nickel-Copper-Nickel triple-layer coating
- Excellent corrosion resistance
- Consistent magnetic performance
- Competitive wholesale pricing
- Bulk discounts available
- Trusted by manufacturers, woodworkers, engineers, and DIY professionals worldwide
