4mm x 4mm x 0.5mm (5/32" x 5/32" x 1/64") Neodymium Square Block – N52 Grade 

Key Features:

• Dimensions: 4mm Length × 4mm Width × 0.5mm Thickness (Approx. 5/32" × 5/32" × 1/64")
• Precision Tolerance: ±0.05mm 
• Magnet Grade: N52 – Highest commercial power in a paper-thin form
• Pull Force: 0.26 LB
• Coating: Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer plating for corrosion resistance
• Magnetization: Axially magnetized through the 0.5mm thickness
• Shape: Ultra-Thin Rectangular Block

Material Description:

Our 4x4x0.5mm N52 blocks are the ultimate hidden fasteners for projects with zero vertical clearance. The 4mm square face provides more holding power and a better glue bond than smaller 3mm magnets, yet remains thin enough to be hidden under paper, fabric, or wood veneers without a visible bulge. These are perfect for creating seamless magnetic closures in high-end consumer goods.

Handling Note: These magnets are exceptionally fragile. Because they are so thin, they can easily snap or shatter if allowed to jump toward metal or each other. Always separate them by sliding the top magnet off the stack and handle with a steady hand.

Warnings and Safety Information:

• Choking Hazard: Small size is dangerous for children and pets. Keep strictly in a secure container.
• Fragility: Neodymium is a brittle ceramic; these ultra-thin blocks can crack easily if mishandled.
• Medical Safety: Keep away from pacemakers and sensitive medical implants.
• Electronics: Safe for modern devices at a distance, but avoid direct contact with magnetic strips.

Applications:

• Magnetic closures for luxury stationery, invitation suites, and gift boxes
• Stealth mounting for LED components in architectural and scale models
• Precision sensors in ultra-slim consumer electronic prototypes
• Hidden magnetic latches for bespoke jewelry cases and high-end folders
• Creating modular magnetic tiles for lightweight display boards