3/4" OD x 1/4" ID x 3/4" N45 Neodymium Ring Magnets – Strong Rare Earth Magnets
Quick Facts
| Attribute |
Value |
| Magnet Type |
Neodymium Rare Earth Ring Magnet |
| Grade |
N45 |
| Shape |
Ring |
| Outside Diameter (OD) |
3/4" (0.750" / 19.05 mm) |
| Inside Diameter (ID) |
1/4" (0.250" / 6.35 mm) |
| Thickness |
3/4" (0.750" / 19.05 mm) |
| Pull Force |
Approximately 55 lbs* |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel (Ni-Cu-Ni) Triple Layer |
| Magnetization |
Axially Magnetized (Through Thickness) |
| Br Max |
13,500 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 55 lbs of pull force under ideal conditions. |
| What is this magnet made of? |
NdFeB (Neodymium-Iron-Boron) rare earth material. |
| Is N45 stronger than N42 magnets? |
Yes. N45 provides greater magnetic strength than N42, 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 high-humidity environments. |
| What is it commonly used for? |
Shaft-mounted assemblies, motors, magnetic couplings, fixtures, robotics, engineering projects, and industrial equipment. |
Product Overview
These 3/4" OD x 1/4" ID x 3/4" N45 Neodymium Ring Magnets deliver exceptional magnetic performance in a heavy-duty ring design. The 1/4-inch center hole allows the magnet to mount directly onto shafts, rods, bolts, or custom hardware, while the thick 3/4-inch profile produces a deep magnetic field and outstanding holding power.
Manufactured from premium N45 grade NdFeB (Neodymium-Iron-Boron), these magnets provide stronger magnetic performance than N42, N40, N38, and N35 grades. Their impressive 55-pound pull force makes them ideal for motors, magnetic couplings, industrial fixtures, robotics, automation systems, product assemblies, and demanding engineering applications.
Each magnet features a durable Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer coating that provides outstanding resistance to corrosion, scratches, and chipping while maintaining a smooth, polished metallic finish.
What Is a Neodymium Ring Magnet?
A neodymium ring magnet is a permanent magnet manufactured from NdFeB (Neodymium-Iron-Boron), the strongest commercially available magnetic material. Ring magnets feature a precision-machined center hole, making them ideal for shaft-mounted applications, motors, bearings, magnetic couplings, sensors, and mechanical assemblies.
This magnet is axially magnetized through its thickness, placing the north and south poles on the two flat circular faces. This magnetic orientation provides strong, uniform holding power for a wide range of industrial and engineering applications.
Neodymium magnets are also commonly known as Neo magnets, NdFeB magnets, NIB magnets, or super magnets.
How Strong Is This Magnet?
This 3/4" OD x 1/4" ID x 3/4" N45 ring magnet delivers approximately 55 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, use this magnet against a clean, flat, thick 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 Ring Magnet |
| Grade |
N45 |
| Shape |
Ring |
| Outside Diameter |
3/4" (0.750" / 19.05 mm) |
| Inside Diameter |
1/4" (0.250" / 6.35 mm) |
| Thickness |
3/4" (0.750" / 19.05 mm) |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel Triple Layer |
| Magnetization |
Axially Magnetized (Through Thickness) |
| Pull Force |
Approximately 55 lbs* |
| Br Max |
13,500 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 and manufacturing |
| N45 |
Very High |
Motors, robotics, industrial equipment |
| N52 |
Maximum |
High-performance applications |
Ring Magnet Size Comparison
| Size |
Typical Use |
| Small |
Sensors, electronics, miniature motors |
| Medium |
General mechanical assemblies |
| 3/4" OD x 1/4" ID x 3/4" |
Shaft-mounted systems, motors, magnetic couplings, robotics |
| Large |
Heavy-duty industrial equipment |
Applications by Industry
| Industry |
Common Uses |
| Manufacturing |
Fixtures, jigs, magnetic assemblies |
| Robotics |
Rotary positioning systems and actuators |
| Automation |
Motors, magnetic couplings, motion control |
| Engineering |
Product development and prototypes |
| Industrial Equipment |
Shaft-mounted assemblies, machinery, custom tooling |
| Research |
Scientific instruments and laboratory equipment |
Common Questions About This Magnet
What is the pull force?
This magnet provides approximately 55 pounds of pull force under ideal testing conditions.
What does axially magnetized mean?
Axial magnetization means the magnet is magnetized through its 3/4-inch thickness, with the north and south poles located on the two flat circular faces.
What is the purpose of the 1/4-inch center hole?
The center hole allows the magnet to be mounted directly onto shafts, rods, bolts, or custom hardware, making it ideal for motors, rotary assemblies, and mechanical systems.
Is N45 stronger than N42 magnets?
Yes. N45 provides greater magnetic strength and holding power than N42 magnets of the same dimensions.
Can this magnet rust?
Like all neodymium magnets, it contains iron and may corrode if the protective coating becomes damaged or exposed to moisture for extended periods.
Can it be used outdoors?
Yes. However, additional sealing is recommended for long-term outdoor or marine applications.
Do you offer bulk discounts?
Yes. Contact Super Magnet Store for wholesale pricing and volume discounts on large quantity orders.
Why Buy From Super Magnet Store?
- Premium N45 NdFeB rare earth ring magnets
- ISO-certified quality
- Stronger than N42, N40, N38, and N35 magnets
- Precision-machined 1/4" center hole
- Axially magnetized for consistent performance
- Durable Nickel-Copper-Nickel triple-layer coating
- Excellent corrosion resistance
- Competitive wholesale pricing
- Bulk discounts available
- Trusted by manufacturers, engineers, educators, and OEM customers worldwide
