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Micro Discs ( 1/4 in. or Less)
Neodymium Disc Magnets › Micro Discs (≤ 1/4 in.)
Micro Neodymium Disc Magnets (≤ 1/4 in. / 6.35 mm)
Precision-engineered micro and miniature rare earth neodymium disc magnets measuring 1/4 inch (0.250 in. / 6.35 mm) in diameter and under. Sintered from high-grade NdFeB alloys (N35 to N52), these compact circular micro-discs deliver high surface field density (up to 14,400 Gauss) and reliable holding power within ultrathin, low-profile footprints.
Precision Electronics
Ideal for Hall-effect sensors, medical devices, relay switches, and micro-actuators.
Hidden Cabinet Latches
Popular 1/4" x 1/16" and 1/4" x 1/8" discs for discreet box lid closures, jewelry, and resin crafts.
Scale Models & Gaming
Perfect for miniature tabletop gaming joints, RC model hatches, and precision 3D prints.
Axial & Diametric Options
Stocked in standard flat face poles (axial) as well as side-magnetized (diametric) configurations.
Technical Overview: Micro Neodymium Disc Magnets (≤ 1/4 in.)
Micro neodymium disc magnets measuring 1/4 inch ( 0.250 in. / 6.35 mm) and smaller form the foundation of our precision Neodymium Disc Magnets line. Manufactured under ISO 9001 quality systems with strict dimensional tolerances of (±0.002 in. / ±0.05 mm), these sintered NdFeB circular discs deliver maximum magnetic force per unit volume. They are widely specified across medical device manufacturing, aviation, defense, consumer electronics, and high-precision craft assemblies.
Grade Variations & Magnetization Orientations
- Material Grades ( N35 to N52 ): Available from standard commercial N35 - N45 formulations up to ultra-strong N50 and N52 grades ( 52 MGOe ) for applications requiring maximum flux density in confined housings.
- Axial Magnetization: Standard stock discs are axially magnetized through their thickness ( T ), placing the North and South magnetic poles on the opposing flat circular faces.
- Diametric Magnetization: Specialty micro-discs and cylinders magnetized across their diameter (side-to-side) for rotational sensors, magnetic switches, and cylindrical latch mechanisms.
Protective Coatings, Thermal Limits & Handling Protocols
To guard against atmospheric corrosion, all micro-discs are protected with a durable triple-layer Nickel-Copper-Nickel (Ni+Cu+Ni) metallic plating or a sleek black epoxy finish. Standard grades operate efficiently in thermal environments up to 176°F (80°C). High-temperature custom grades are available for elevated industrial or engine bay conditions.
Safety & Handling Notice: Sintered NdFeB is inherently hard and brittle; micro-discs should never be drilled or machined manually, as grinding damages protective plating and creates combustible dust. Due to their small physical size, keep micro neodymium magnets securely away from young children and pets to prevent choking hazards or internal ingestion risks.
Frequently Asked Questions (FAQ)
What size threshold defines a "Micro" disc magnet?
This subcategory is dedicated specifically to round rare earth disc and rod magnets with outer diameters measuring 1/4 inch ( 0.250 in. / 6.35 mm ) or smaller, down to fraction-of-a-millimeter micro-cylinders.
How do micro disc magnets differ from rectangular block magnets?
Disc magnets feature a circular profile designed for countersunk round holes, flush-fitting cylindrical pockets, and rotational applications. For flat rectangular channels or anti-pivot requirements, explore our Neodymium Block Magnets collection.
Can micro neodymium disc magnets be used outdoors?
Yes. When coated with triple-layer Nickel-Copper-Nickel (Ni+Cu+Ni) or black epoxy, micro-discs withstand typical outdoor exposure provided they are protected from prolonged immersion or acidic chemical conditions.
Can I request custom sizes, tolerances, or magnetizations?
Yes. As a primary manufacturer and distributor, CMS Magnetics provides OEM custom production for micro-disc magnets with specialized dimensions, tight tolerances, custom coatings, and specific magnetic field orientations.