Rochester Magnet stocks and sources neodymium magnets in discs, rings, and blocks, from small magnets for prototyping to large magnets for production runs. Standard grade N35 nickel-plated stock ships from inventory, with higher grades, high-temperature ratings, and custom dimensions available by request. No order is too large or too small.
Round neodymium magnets identified by diameter and height (a 0.500″ x 0.125″ disc is 0.500″ in diameter and 0.125″ tall). Magnetized through the thickness unless specified otherwise. The most common shape for closures, sensors, and holding applications.
Round neodymium magnets with a center hole, specified by outside diameter, inside diameter, and thickness. Used in motors, speakers, sensors, and shaft-mounted assemblies. Magnetized through the thickness unless specified otherwise.
Square and rectangular neodymium magnets specified by length, width, and thickness. Used in motor assemblies, fixtures, and industrial holding applications. Magnetized through the thickness unless specified otherwise.
Neodymium discs with pre-applied adhesive for fast installation in packaging closures, point of sale fixtures, and assembly applications. Available with adhesive on the north or south face for proper magnet-to-magnet alignment.
Simply complete and submit the online form below and we’ll review your specs and contact you with any questions.
Neodymium magnets, also called NdFeB magnets, are permanent magnets made from an alloy of neodymium, iron, and boron. They belong to the rare earth magnet family and produce the strongest magnetic field of any commercially available permanent magnet. A small neodymium disc can hold many times its own weight, which is why engineers reach for them whenever high strength is needed in a compact form.
The element neodymium was discovered in 1885, but the magnet itself wasn’t invented until the early 1980s. Each magnet is made by melting or pressing pure metal alloys of neodymium, boron, and iron under high pressure. Melted and sintered material produces the highest-energy magnets, while a powdered bonded form supports complex molded shapes at lower energy levels.
Among all permanent magnets, it offers the greatest power-to-weight ratio and more lift for its size than samarium cobalt or ceramic. Since the late 20th century, neodymium has been central to miniaturizing electronics like cellphones, microphones, and speakers.
The strength of a neodymium magnet is expressed as a grade, written as the letter N followed by a number (for example, N35 or N52). The number indicates the maximum energy product measured in Mega Gauss Oersteds (MGOe). A higher number means a stronger magnet.
Standard neodymium grades begin to lose magnetization above 176°F (80°C). For applications involving heat, high-temperature grades carry an additional letter designation (H, SH, UH, EH, M, TH) that indicates a higher maximum operating temperature. If your application runs warm, specify a high-temperature grade so the magnet maintains its strength under load.
For applications that require thermal stability beyond what high-temperature neodymium can provide, Samarium Cobalt is the alternative rare earth option. Our team can help you weigh strength, temperature, size, and cost to land on the right grade.
Pull force is the amount of weight a magnet can hold against a flat steel surface in direct contact. Several factors determine the pull force you’ll see in practice:
Our most popular stock discs are nickel-plated grade N35. For a complete listing of stock sizes with pull force data, contact our engineering staff.
Beyond standard discs, rings, and blocks, Rochester Magnet sources custom neodymium magnets to your specifications. Custom options include:
Custom neodymium magnet orders typically take weeks to source and produce rather than months. Share your drawings and performance requirements and our team will quote timelines and pricing.
The same strength that makes neodymium magnets useful also makes them potentially hazardous if handled carelessly. A few practices keep handling safe:
Rochester Magnet can advise on handling procedures and packaging methods for your specific magnets. Let us know if you need guidance on safe integration into your product or process.
Neodymium magnets are embedded in products and systems across nearly every manufacturing sector. Common applications include:
Choosing neodymium over another magnet material comes down to the demands of the application.
Neodymium produces far more pull force per unit size and weight. Ceramic magnets cost less and resist higher temperatures, which is why they’re often paired with steel armatures in magnetic assemblies to compensate for lower raw strength. Choose neodymium when strength and compactness matter; choose ceramic when cost and temperature resistance are the priorities.
Both are rare earth magnets. Neodymium is stronger, more affordable, and more resilient. Samarium cobalt withstands much higher temperatures and resists corrosion naturally. Choose neodymium for ambient-temperature strength and value; choose samarium cobalt for sustained high-heat or corrosive environments.
Alnico handles extreme temperatures (up to about 1,000°F) better than any other common material, but it produces a weaker field and demagnetizes more easily. Choose neodymium for raw strength; choose alnico for high-temperature stability where lower strength is acceptable.
Neodymium magnets that have been partially demagnetized by excessive heat can sometimes be remagnetized to their original strength using specialized equipment, provided the material hasn’t been physically damaged or heated past the point of permanent structural change. For most users, replacing the magnet is more practical than remagnetizing. If you have a large quantity affected, contact our team to discuss options.
Neodymium magnets stored together don’t lose strength from proximity alone, but they pose a handling hazard because they attract powerfully and can snap together, chip, or pinch. The concern with storage is physical safety and avoiding chipping, not demagnetization. Use spacers and store magnets in arrangements that prevent them from slamming together.
Machining neodymium is difficult and risky. The material is hard, brittle, and can ignite as fine dust during grinding. It should be machined only by suppliers with the right equipment and safety controls, and typically before final magnetization. Rather than modifying a stock magnet, it’s better to order a custom magnet produced to your required dimensions. Our team can source custom shapes and sizes for your application.
