20mm x 5mm Neodymium Disc Magnet – N52 Grade | Water-Resistant Black Epoxy Coating

Key Features:

• Dimensions: 20mm Diameter × 5mm Thickness
• Corrosion-Resistant Coating: Premium Black Epoxy resin shell protects against moisture, salt spray, and oxidation
• Deep-Field Profile: Substantial 5mm thickness creates high magnetic volume for deep flux penetration through air gaps
• Precision Tolerance: ±0.05mm 
• Magnet Grade: N52 
• Pull Force: Approx. 21 lbs 
• Magnetization: Axially magnetized (Poles on the flat circular faces)

Material Description:

Our 20mm x 5mm N52 black epoxy coated disc magnets provide an exceptionally strong, weather-resistant fastening solution for demanding commercial, architectural, and marine environments. Unlike standard triple-layer nickel plating which can oxidize, flake, or corrode over time in damp conditions, the continuous black epoxy finish forms an airtight shield over the rare-earth core. The broad 20mm outer diameter provides superior lateral stability and exceptional resistance to high torque and shearing forces, while the 5mm depth allows the field to project reliably through thick non-magnetic dividers like wood panels, fiberglass, heavy plastics, or fabrics. The matte black finish also ensures a professional, completely concealed or low-profile look for high-end retail fixtures and industrial goods.

Handling Advice: EXTREME DANGER: Formidable N52 industrial-scale magnets require strict, controlled handling. Sintered neodymium is inherently brittle like ceramic. With nearly 20 lbs of raw pull force, two magnets will accelerate toward steel tools or each other with finger-crushing velocity. High-velocity impact will cause the core to shatter violently into sharp fragments or breach the protective epoxy layer. Always separate individual pieces by sliding them off the stack rather than pulling vertically, and keep them spaced far apart during installation.

Warnings and Safety Information:

• Severe Crush Hazard: High risk of serious skin and finger pinching, blood blisters, or bruising. Handle with professional focus.
• Brittle Core Warning: Sintered neodymium is fragile. High-impact collisions or dropping onto hard surfaces will fracture the core or chip the coating.
• CHOKING HAZARD: Keep securely stored and out of reach of children and pets.
• Medical Safety: KEEP AWAY from pacemakers and sensitive medical implants at all times.

Applications:

• Heavy moisture-resistant hidden closures for marine cabinetry, access hatches, and outdoor equipment doors
• Concealed anchoring systems for large removable vehicle graphics, heavy commercial signage, and exhibition frames
• Deep-field proximity sensor targets, reed switch activations, and high-vibration Hall-effect setups in damp environments
• Heavy-duty structural mounting points for 3D-printed rugged industrial housings, battery packs, and covers
• Secure mechanical attachment points for manufacturing jigs, workshop tool organization, and magnetic separators