MGT DISC Magnet 3x1mm: Specifications, Features, and Practical Uses in SA

Overview: What is the MGT DISC Magnet 3x1mm?

The MGT DISC Magnet 3x1mm is a compact neodymium rare-earth disc magnet measuring 3 mm in diameter and 1 mm thick. Popular with South African makers, students, and professionals, it's widely used for sensor actuation (e.g., reed switches, Hall effect sensors), micro-robotics, and contactless triggering in electronics. With strong holding force in a tiny footprint, this disc magnet bridges 'maker' and engineering-grade applications.

Typical Uses in South Africa

• Triggering SMD or through-hole reed switches in PCBs and breadboards
• Home automation limit switches (3D printers, robotic arms, sliding doors)
• Educational STEM kits (maglev demos, magnetic levitation, magnetism experiments)
• Miniature closures and fixtures in prototyping or wearable builds
• Industrial position sensing (with robust enclosures)

Key Specifications for 3x1mm MGT Disc Magnets

Features That Matter for Projects

• Ultra-compact form for dense PCBs and enclosures
• High energy product (Br) ensures efficient triggering
• Coated for resistance to corrosion in indoor environments
• Compatible with solder-free magnetic mounting points
• No need for external power or wiring

How to Identify a Quality Disc Magnet

• Smooth, defect-free plating (no pitting or rust)
• Consistent magnetisation across the face
• Packaging to prevent shattering - especially for bulk educational orders

Selection Criteria: Grades, Holding Force, and More

1. Magnetic Grade: Common choices are N35 (standard), N38 (higher flux), and N42 (strongest in this form factor). For typical sensor switching, any above N35 will suffice.
2. Coating Type: Use standard NiCuNi indoors. If exposed to humidity (garage doors, aquariums), opt for zinc-plated or epoxy-coated versions.
3. Application Fit: Consider clearance and whether the magnet will sit in a pocket, glue well, or mate flush.
4. Bulk Needs: Education projects and production lines may benefit from factory bagging and batch tolerance checks — Communica can assist with local queries.

Calculating Magnetic Force (Example)

Typical Troubleshooting Scenarios

• Magnet not tripping sensor? Ensure correct alignment and proximity; try higher grade (N42) if needed.
• Degraded strength over time? Prolonged high temperatures can demagnetise (keep under 80 degreesC).
• Surface corrosion? Check for coating failure; upgrade to epoxy or use in low-humidity environments.
• Chipping? Avoid forceful impacts; handle with plastic tweezers if possible.

Finding 3x1mm Disc Magnets at Communica

Browse All Products under Magnets in Passive Components, or filter by size and brand for bulk and project use. Lead times for standard lines are typically short; contact the branch for high-quantity needs or large education kits.

SA Project Example

Sources

• Communica Passive Components & Magnets - Product Selection
• K&J Magnetics: Pull Force Calculator
• Supermagnete: Calculation of Holding Forces
• Engineering Toolbox - Magnetic Permeability Data
• Arnold Magnetic Technologies: NdFeB Magnet Properties