4mm (5/32") Neodymium Sphere Magnets – N52 Grade

Key Features:

• Diameter: 4mm (Approx. 5/32")
• Precision Tolerance: ±0.05mm 
• Magnet Grade: N52 
• Pull Force: Approx. 0.83 lbs 
• Coating: Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer plating 
• Magnetization: Axially magnetized (Poles on opposite sides of the sphere)

Material Description:

Our 4mm N52 spheres are engineered for professional applications where maximum magnetic strength must be combined with a spherical geometry. The N52 grade provides a deep, concentrated magnetic field that allows these spheres to securely "snap" together or hold components through thicker non-magnetic layers. Their ability to rotate freely to align poles makes them indispensable for creating robust ball-and-socket joints in high-end robotics and articulated display models.

Handling Advice: DANGER: These spheres are small but pack a serious punch. Due to the N52 grade, they will jump toward each other from several inches away. Because of their concentrated magnetic field and spherical shape, high-impact collisions can easily cause the brittle neodymium core to shatter or chip. Always handle with a firm grip and work on a non-magnetic mat to prevent loss or damage.

Warnings and Safety Information:

• CHOKING & INGESTION HAZARD: Extremely dangerous if swallowed. These are a major safety risk for children and pets.
• Ingestion Warning: If two or more magnets are swallowed, they can attract through tissue, causing fatal internal damage. KEEP OUT OF REACH OF CHILDREN AND PETS.
• Medical Safety: KEEP AWAY from pacemakers and sensitive medical implants at all times.
• Electronics: Safe for most modern devices at a distance, but avoid direct contact with hard drives or magnetic strips.

Applications:

• High-load ball-and-socket joints for custom action figures and robotics
• Industrial proximity sensors and magnetic field triggers
• Precision magnetic bearings for micro-mechanical systems
• Advanced 3D-modeling and architectural structural prototypes
• Modular mounting for wearable tech and high-end fashion closures