3/4" Ceramic Disc Magnet

3/4" Ceramic Disc Magnet — High-Strength Ferrite 0.71"D x 0.2" for DIY Magnetic Closures

The 3/4" (0.71"D) ceramic disc magnet is a Grade 5 ferrite magnet engineered for secure and consistent magnetic holding in assembly, display, or craft projects that require a dependable attachment solution. Measuring 0.71 inches (18 mm) in diameter and 0.20 inches (5 mm) thick, it features a hard, dense structure and is axially magnetized through the thickness, making it ideal for tasks involving metal-to-surface fastening, lightweight projects, and various storage or attachment applications where a quick, tool-free magnetic solution is preferred[1][7][8].

Key Features

• Reliable Grade 5 ferrite construction delivers consistent magnetic pull for daily project use
• Axially magnetized design ensures secure alignment and attachment in multi-component setups
• ±0.005" (±0.13 mm) tolerance on diameter and thickness for confident placement and repeatability
• Adheres easily with hot glue or epoxy, suiting rigid and semi-flexible mounting in DIY builds
• Tolerates high operating temperatures up to 592°F (300°C), fitting a range of craft and workshop environments
• Available in multi-unit packs to meet the needs of classrooms, production runs, or large-scale designs
• Non-coated ceramic surface offers a traditional, industrial look and excellent resistance to demagnetization

Specifications

• Material: Ferrite (ceramic), iron oxide and barium or strontium carbonate
• Grade: 5
• Diameter: 0.71" (18 mm)
• Thickness: 0.20" (5 mm)
• Imperial Fractional Size: 23/32" (rounded)
• Magnetization: Axially through thickness
• Pull Force: Approx. 12 oz (0.34 kg)
• Tolerance: ±0.005" (±0.13 mm) on diameter/thickness
• Surface: Hard, brittle, dark gray ceramic
• Maximum Operating Temperature: 592°F (300°C)
• Curie Temperature: 842°F (450°C)
• Density: 0.178 lb/in³
• Magnetic Properties: Br: 3,950 Gauss; BHmax: 3.6 MGOe; Hc: 2,400 Oersteds; Hci: 2,450 Oersteds
• Finish: Uncoated, matte surface
• Weight (each magnet): Approx. 0.21 oz (6 g)

Suggested Uses

With its specific dimensions and robust holding power, this 3/4" ceramic disc magnet easily tackles jobs such as creating magnetic closures for custom cabinets, hidden latch assemblies, or craft storage boxes. STEM educators frequently turn to this size for hands-on physics demonstrations, student-built motor assemblies, and science fair displays involving magnetic levitation or attraction. In household organizing, these magnets work well for making magnetic spice jars, tool rack attachments, or fridge message boards, ensuring metal items are always where you need them. Crafters and hobbyists favor this magnet for custom fridge magnets, removable signage, and card or poster mounting. A clever, unique use at this size is attaching them behind seasonal decor to switch out metal signs or artwork on steel doors, allowing for frequent updates without wear or visible hardware. Always use with proper adhesives and supervise children during projects for added safety[1][7][8].

Frequently Asked Questions

• Is this magnet strong enough to hold a standard kitchen towel on a refrigerator?
  Yes, the pull force of approximately 12 ounces (0.34 kg) is sufficient for lightweight items like towels, papers, or craft projects when attached to a flat metal surface.
• Is the surface smooth enough for direct contact with painted metal appliances?
  The ceramic surface is hard and matte, and while not rough, it is best to avoid sliding to prevent marks on delicate finishes. Use felt pads if concerned.
• Can this disc magnet be used inside a wooden cabinet door for a hidden magnetic latch?
  Yes, it is commonly used for concealed fasteners in cabinets and boxes due to its thickness and magnetic direction.
• Is it safe to use hot glue or epoxy for mounting?
  Both adhesives are suitable for securing these ferrite magnets to wood, plastic, or metal. Ensure surfaces are clean and dry for the best hold.
• What is the temperature limit for this magnet in a heated workshop?
  The maximum working temperature is 592°F (300°C), well above typical workshop or display environments.
• How many magnets come in a pack for bulk purchases?
  Packs are available in multiple quantities, such as 70 or 350, to suit the needs of classrooms, production runs, or retail crafting.
• Will the dimensions fit a standard 3/4" recess?
  With a diameter of 0.71" (18 mm) and a thickness of 0.20" (5 mm), the magnets are a close match for 3/4" holes or slots, allowing for slightly snug or loose fits depending on tolerances.
• Can I use these magnets outdoors?
  While ferrite magnets are corrosion-resistant, the uncoated ceramic surface may degrade if exposed to water or moisture over time. Consider shelter or coated varieties for outdoor projects.
• Are these magnets safe for use in classroom science activities?
  They are suited for educational demonstrations and projects but should be handled with care, kept away from young children, and never swallowed due to their small size and brittleness.
• Is the magnetization direction suitable for creating magnetic boards?
  Yes, axially magnetized discs provide optimal face-to-face holding strength, which is perfect for board and surface attachment applications.
• Are these appropriate for bottle cap crafts?
  Absolutely! The size and shape fit the back of typical bottle caps, making them a go-to favorite among crafters for decorative magnets[7].
• What precautions should be taken when handling these magnets?
  Avoid snapping them together or dropping, as ferrite ceramics are brittle and can chip or break under impact. Always store safely to prevent accidental pinching.

Choose this 3/4" ceramic disc magnet for reliable and repeatable holding in your next DIY, classroom, or craft build. Engineered for performance and quality you can count on, these magnets help bring your project ideas to life with secure magnetic functionality and trusted results.