Top Quality Rare Earth Neodymium Magnets High Grade. Nickel-Copper-Nickel triple layer coated for durability and excellent protection against corrosion Estimated Pull Force: 260 lbs, Great performance. Magnetized through the Thickness. Poles are on the Length surfaces. Quantity: 1 magnet per package. Unlock the unmatched power of neodymium rare earth magnets, the strongest type of permanent magnet commercially available today. Engineered for strength, precision, and reliability, this 40mm x 40mm x 20mm neodymium block magnet delivers superior performance across industrial, manufacturing, laboratory, and research applications. Made from a carefully balanced combination of neodymium (Nd), iron (Fe), and boron (B), each magnet undergoes advanced sintering and coating processes to ensure consistent magnetic properties and long-term durability. Its dense crystalline structure gives it an exceptionally high energy product, allowing it to hold or lift substantial weight relative to its size. Engineered for Performance Every magnet is manufactured under strict quality standards to ensure dimensional accuracy, magnetic strength, and corrosion resistance. A triple-layer nickel–copper–nickel plating provides excellent protection against oxidation and wear, preserving surface integrity even in challenging environments. With a rated pull force of up to 240 pounds (under ideal conditions), this block magnet is ideal for heavy-duty holding, alignment, and mounting applications. It maintains stability and performance across temperature ranges up to 175°F (80°C), ensuring reliability in both laboratory and industrial environments. Common Applications This versatile neodymium magnet serves a wide variety of uses across multiple industries: Industrial & Manufacturing: Holding and securing metal parts, fixtures, or jigs during fabrication Positioning components in welding, assembly, or machining Integration into magnetic tools, retrieval devices, or separation systems Scientific & Engineering: Prototyping mechanical systems and experimental designs Supporting classroom demonstrations and laboratory setups Research involving magnetic field behavior or mechanical stress Commercial & General Use: Metal detection and organization in workshops or garages Mounting signs, displays, and equipment without drilling or adhesives Custom applications where high magnetic holding force is required Every use case benefits from the balance of compact size and extreme power that only rare-earth magnets provide. Material & Structure These magnets are made from neodymium–iron–boron alloy (NdFeB), the most advanced magnetic material available. The grade offers a balanced performance profile — powerful enough for industrial tasks, yet stable under moderate heat and stress conditions. Each magnet is directionally magnetized through one axis (north and south poles on opposite large faces), providing a focused and predictable magnetic field. The block shape maximizes surface contact and ensures dependable holding performance, even on uneven or curved metallic surfaces. The magnet’s exterior is finished with a multi-layer protective coating: Nickel (base layer for adhesion) Copper (intermediate layer to prevent corrosion spread) Nickel (outer layer for polished finish and added durability) This coating combination offers the best protection against oxidation and mechanical wear while maintaining magnetic efficiency. Handling Guidelines While incredibly useful, neodymium magnets require careful handling due to their strength. Two magnets can attract with enough force to cause injury or breakage if allowed to collide. Always slide magnets apart rather than pulling directly, and keep a safe distance between multiple units when handling or storing. When separating magnets, use non-metallic spacers, gloves, or padded surfaces to reduce the risk of chipping. The brittle crystalline structure of NdFeB can cause edges to chip or crack under sudden impact. Temperature & Environmental Conditions Neodymium magnets perform best at room temperature and begin to lose magnetic strength gradually above 175°F (80°C). Extended exposure beyond this limit can cause irreversible demagnetization. Avoid placing magnets in environments with high humidity or direct contact with water unless properly sealed or coated. While the nickel plating offers basic protection, prolonged moisture exposure may lead to corrosion, particularly at edges and corners. Storage & Transport For safety, store magnets in pairs with opposite poles facing each other, separated by spacers to reduce magnetic interference. This method minimizes external magnetic fields and prevents accidental attraction to nearby metallic objects. Neodymium magnets are classified as magnetized materials and may be subject to specific shipping restrictions, particularly by air. Proper packaging and labeling are required to comply with international transport regulations. ⚠️ Safety Warnings Neodymium magnets are not toys.