Samarium Cobalt Countersunk Ring Magnet – 20mm OD x 10mm H | 5.2mm Countersunk Hole | North on Countersunk Face

The Samarium Cobalt (SmCo) Countersunk Ring Magnet – 20mm OD x 10mm H with 5.2mm countersunk hole | North on Countersunk Face is a high-performance rare earth permanent magnet designed for applications requiring reliable magnetic strength, excellent temperature stability and secure mechanical mounting.

Measuring 20mm outside diameter x 10mm high, this round SmCo magnet features a 5.2mm countersunk centre hole for installation using a compatible countersunk screw. The magnet has a defined polarity with the North pole located on the countersunk face, making it particularly useful for engineered assemblies where magnetic orientation must be known and consistent.

Samarium Cobalt magnets are valued for their excellent resistance to high temperatures, corrosion and demagnetisation. These characteristics make SmCo an excellent magnetic material for demanding industrial, engineering, aerospace, automotive and specialised applications where standard neodymium magnets may not be suitable.

Key Features

• High-performance Samarium Cobalt (SmCo) rare earth magnet
• 20mm outside diameter
• 10mm height
• 5.2mm countersunk centre hole
• North pole on the countersunk face
• Defined polarity for precision magnetic assemblies
• Designed for countersunk screw mounting
• Excellent temperature stability
• High resistance to demagnetisation
• Naturally good corrosion resistance
• Suitable for demanding industrial and engineering applications

Common Applications

• High-temperature magnetic assemblies
• Industrial machinery
• Aerospace components
• Automotive equipment
• Sensors and instrumentation
• Magnetic positioning systems
• Electronics
• Scientific equipment
• Custom fixtures and mechanisms
• OEM magnetic assemblies

North Pole on the Countersunk Face

This SmCo magnet has a specified magnetic orientation with the North pole located on the countersunk face.

Clearly defined polarity is particularly important when magnets are incorporated into assemblies involving magnet-to-magnet attraction or repulsion, sensors, switching systems and precision positioning.

When pairing this magnet with another permanent magnet, confirm the required pole orientation before installation. Opposite magnetic poles attract, while matching poles repel.

Countersunk Hole for Mechanical Mounting

The 5.2mm countersunk centre hole provides a convenient method for mechanically securing the magnet to a compatible surface.

A correctly sized countersunk fastener can sit within the recessed hole, helping create a neat, low-profile installation. Mechanical mounting is particularly useful in industrial applications where adhesive bonding alone may not provide the preferred installation method.

Care must be taken during installation. Samarium Cobalt is a hard and brittle magnetic material, so screws should not be overtightened or used to place excessive mechanical stress on the magnet.

Why Choose a Samarium Cobalt Magnet?

Samarium Cobalt magnets are part of the rare earth magnet family and provide an excellent combination of magnetic strength and environmental stability.

Compared with standard neodymium magnets, SmCo magnets are particularly valued for their:

• Excellent performance at elevated temperatures
• High resistance to irreversible demagnetisation
• Good resistance to corrosion
• Strong magnetic performance
• Excellent magnetic stability over a wide temperature range

These characteristics make SmCo magnets particularly useful in demanding applications where temperature stability and long-term magnetic reliability are more important than simply achieving the highest possible magnetic strength.

Technical Specifications

• Product Type: Samarium Cobalt Countersunk Ring Magnet
• Magnetic Material: Samarium Cobalt (SmCo)
• Magnet Type: Rare Earth Permanent Magnet
• Shape: Ring / Countersunk
• Outside Diameter: 20mm
• Height: 10mm
• Countersunk Hole Diameter: 5.2mm
• Polarity: North pole on countersunk face
• Mounting Method: Compatible countersunk fastener
• Typical Applications: High-temperature equipment, sensing, positioning, industrial machinery and precision magnetic assemblies

High-Temperature and Industrial Applications

The combination of SmCo magnetic material, compact 20mm x 10mm dimensions and countersunk mounting makes this magnet particularly suitable for specialised equipment and engineered assemblies.

SmCo magnets are commonly selected for environments involving elevated operating temperatures or conditions where reliable magnetic performance over time is essential. Potential applications include motors, sensors, instrumentation, aerospace systems, industrial machinery and specialised electronic equipment.

Always confirm the required operating temperature, magnetic orientation and mechanical requirements for your specific application before installation.

Please Note

Samarium Cobalt magnets are hard but brittle. They can chip, crack or fracture if dropped, struck, overtightened or allowed to collide with another magnet or steel surface.

When using the countersunk hole, select an appropriately sized fastener and tighten carefully. The screw should secure the magnet without applying excessive pressure to the countersunk surface.

Actual magnetic holding performance depends on factors including mating material, steel thickness, contact area, air gaps, operating temperature and direction of applied force.

The North pole is located on the countersunk face, so polarity should be considered when combining this magnet with other permanent magnets or polarity-sensitive components.

Do not drill, cut or machine the magnet. Keep strong magnets away from children, pacemakers, medical implants, magnetic storage media and sensitive electronic equipment.