MGT Disc Magnet 3x1mm (10 Pack): Reliable Magnets for Electronic Projects in South Africa

Overview: MGT Disc Magnet 3x1mm (10 Pack)

Magnets are essential for innovative design, quick mechanism engagement, and non-contact sensing in electronics. The MGT disc magnet 3x1mm, supplied in a practical 10-pack, offers a compact, strong, and highly versatile solution. With their small form factor, these magnets are favoured in South African maker projects, as well as by technicians and design engineers for applications from PCB positioning to reed switch activation.

Essential Features & Specifications

Neodymium (NdFeB) disc magnets are known for their high strength-to-size ratio, minimal corrosion when handled correctly, and reliable performance in small enclosures. The 3mm x 1mm format is especially popular for projects with tight mechanical constraints.

How Are 3x1mm Disc Magnets Used in Electronics?

• Activating reed switches for non-contact sensing or limit detection in robotics and IoT
• Providing removable panel closures in custom enclosures
• Retaining small doors/lids on instrument builds
• Micro-positioning for assembly jigs and fixture prototyping
• As part of homemade encoders and magnetic field experiments in educational labs

For learners and students, these magnets are often paired with sensors and passives (like reed switches) which are also readily available from Communica's stocked brands. Fast branch pickup means you can quickly iterate prototypes or fix failed assemblies without ordering overseas.

Selection Criteria & Practical Tips

When choosing small neodymium disc magnets, consider the following criteria for best results:

• Required holding force (refer to datasheets-approx. 0.2-0.5kg for 3x1mm, but varies by mounting and surface)
• Compatibility with enclosure materials (steel, ABS, acrylic, etc.)
• Assembly method: glue-in, tight pocket fit, or light mechanical fastening
• Presence of other magnetic fields (motors, transformers) that may affect sensors

Students and labs in South Africa can benefit from working with standard-sized magnets, ensuring easy replacement and repeatability between experiments or practical assessments.

Example Application: Using a 3x1mm Magnet with a Reed Switch

For contactless position detection, a 3x1mm disc magnet can be mounted to a moving part and paired with a reed switch on a PCB or a chassis wall. As the magnet passes near the reed switch, it closes, creating a simple proximity sensor setup.

A simple wiring diagram for this application:

+3.3V [Pull-up 10kOhm] Reed Switch  GND
                        |                 |
                       GPIO             Magnet (Moves)

Note: Actual activation distance will depend on mounting, approach direction, and the reed switch sensitivity (specified in ampere-turns, AT).

Troubleshooting & Usage Notes for South African Builders

• Magnet lost adhesion: Try stronger adhesives (epoxy, cyanoacrylate) or 3D-printed press-fit slots. Some glues may off-gas during drying-ventilate work areas.
• Magnet interferes with sensors: Increase separation from Hall effect or magnetometer-equipped modules or use shields.
• Corrosion risk: Keep magnets dry and handle with clean hands. Standard neodymium magnets may corrode if scratched-consider sealing with varnish in harsh environments.
• Stock availability: The 3x1mm MGT magnets are routinely stocked at Communica's Samrand warehouse and main branches, reducing wait times compared to international shipping.

Locally Stocked Magnet Accessories and Alternatives

Explore other sizes (e.g., 5x2mm or ring/cylinder types) in the Magnet category at Communica, or browse pairing devices like reed switches and enclosure kits. Bulk packs available for education and research labs.

Sources

• Magnet Collection - Communica
• Neodymium Magnet Specifications - K&J Magnetics
• Reed Switch Principles - Wikipedia
• Adafruit Sensors & Magnetics
• About Communica