1.5" OD x 1/2" Thick x 1/4" ID N45 Neodymium Ring Magnets – Strong Rare Earth Magnets
Quick Facts
| Attribute |
Value |
| Magnet Type |
Neodymium Rare Earth Ring Magnet |
| Grade |
N45 |
| Shape |
Ring / Disc with Center Hole |
| Outside Diameter |
1.5" (38.1 mm) |
| Inside Diameter |
1/4" (6.35 mm) |
| Thickness |
1/2" (0.500" / 12.7 mm) |
| Pull Force |
Approximately 72 lbs* |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel (Ni-Cu-Ni) Triple Layer |
| Magnetization |
Through Thickness (Axially Magnetized) |
| Br Max |
13,500 Gauss |
| Certification |
ISO Certified |
*Note: Actual pull force may vary depending on the application, contact surface, steel thickness, air gap, and mounting method. Testing in your specific application is recommended.
Quick Answers
| Question |
Answer |
| How strong is this magnet? |
Approximately 72 lbs of pull force under ideal conditions. |
| What is this magnet made of? |
NdFeB (Neodymium-Iron-Boron) rare earth material. |
| Is this stronger than N35 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 marine environments. |
| What is it commonly used for? |
Shaft mounting, motors, sensors, magnetic couplings, robotics, machinery, fixtures, and engineering projects. |
Product Overview
These 1.5" OD x 1/2" Thick x 1/4" ID N45 Neodymium Ring Magnets deliver exceptional magnetic strength in a versatile ring design. The 1.5-inch outside diameter provides a large magnetic contact area, while the 1/4-inch center hole allows the magnet to be mounted on shafts, rods, or bolts for a wide range of industrial and engineering applications. Under ideal conditions, this magnet generates approximately 72 pounds of pull force.
Manufactured from premium N45 grade NdFeB (Neodymium-Iron-Boron), these magnets provide stronger magnetic performance than N42, N40, N38, and N35 grades. They are widely used in electric motors, magnetic couplings, rotary equipment, scientific instruments, automation systems, and heavy-duty fixtures where both strength and precision are required.
Each magnet features a durable Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer coating, providing excellent resistance to corrosion, scratches, and chipping while maintaining a smooth, polished finish. Manufactured in ISO-certified facilities, these magnets deliver reliable quality and long-lasting performance.
What Is a Neodymium Ring Magnet?
A neodymium ring magnet is a permanent NdFeB (Neodymium-Iron-Boron) magnet with a precision-machined center hole. The ring design allows the magnet to be installed on shafts, bolts, rods, or custom mounting hardware while maintaining exceptional magnetic strength.
This magnet is magnetized through its 1/2-inch thickness (axially magnetized), placing the north and south poles on the two flat circular faces. Ring magnets are commonly used in motors, generators, magnetic bearings, sensors, holding fixtures, and industrial assemblies.
Neodymium magnets are also commonly known as Neo magnets, NdFeB magnets, NIB magnets, or super magnets.
How Strong Is This Magnet?
This 1.5" OD x 1/2" Thick x 1/4" ID N45 ring magnet delivers approximately 72 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, use the magnet against a clean, flat, thick steel surface.
Note: Pull force values are estimates based on ideal laboratory testing. 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 |
1.5" (38.1 mm) |
| Inside Diameter |
1/4" (6.35 mm) |
| Thickness |
1/2" (12.7 mm) |
| Pull Force |
Approximately 72 lbs* |
| Material |
NdFeB (Neodymium-Iron-Boron) |
| Coating |
Nickel-Copper-Nickel Triple Layer |
| Magnetization |
Through Thickness (Axially Magnetized) |
| Br Max |
13,500 Gauss |
| Certification |
ISO Certified |
Magnet Grade Comparison
| Grade |
Relative Strength |
Typical Applications |
| N35 |
Standard |
General purpose |
| N38 |
Moderate |
Consumer products |
| N40 |
High |
Industrial |
| N42 |
Higher |
Engineering |
| N45 |
Very High |
Industrial machinery and automation |
| N52 |
Maximum |
High-performance |
Ring Magnet Size Comparison
| Size |
Typical Use |
| Small |
Sensors & electronics |
| Medium |
General mounting |
| Large (1.5" × 1/2") |
Motors, machinery, heavy-duty fixtures, magnetic couplings |
Applications by Industry
| Industry |
Common Uses |
| Manufacturing |
Fixtures & tooling |
| Robotics |
Shafts, positioning systems |
| Electronics |
Motors & sensors |
| Industrial |
Magnetic couplings, machinery |
| Research |
Scientific instruments |
| DIY |
Custom mechanical projects |
Common Questions About This Magnet
What is the pull force?
This magnet provides approximately 72 pounds of pull force under ideal testing conditions.
Is N45 stronger than N35 magnets?
Yes. N45 provides significantly greater magnetic strength and holding power than N35 magnets of the same dimensions.
Can it 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 prolonged outdoor exposure or marine environments.
What direction is it magnetized?
This magnet is magnetized through its 1/2-inch thickness (axially magnetized), 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 commercial, industrial, OEM, educational, and reseller orders.
Why Buy From Super Magnet Store?
- Premium NdFeB magnets
- ISO-certified quality
- High-performance N45 magnetic grade
- Durable Nickel-Copper-Nickel triple-layer coating
- Precision-machined center hole
- Consistent magnetic performance
- Excellent corrosion resistance
- Competitive pricing
- Bulk discounts available
- Fast shipping
- Trusted by manufacturers, engineers, educators, businesses, and DIY enthusiasts worldwide
