SM-047896 High-Performance diametrally Magnetized AlNiCo Ring Magnets 20×10×4mm, Sintered Permanent Ring Magnets for Sensors & Precision Applications
Features
· diametrally Magnetized Design for Directional Field Control: The specialized diametrally magnetization creates a uniform magnetic field that radiates from the inner bore to the outer diameter (or vice versa), a critical feature for applications like speed sensors, flow meters, and rotational encoders. This field distribution ensures consistent signal detection and reliable performance in precision systems, unlike axially magnetized rings that cannot deliver the required directional field alignment.
· Premium AlNiCo with Superior Thermal Stability: Crafted from high-grade sintered AlNiCo, these magnets maintain exceptional magnetic performance across a wide temperature range, with a Curie temperature exceeding 850°C and minimal magnetic loss even at continuous operating temperatures up to 500°C. This makes them ideal for high-temperature environments where neodymium magnets would suffer irreversible demagnetization.
· Natural Corrosion Resistance (Uncoated Construction): AlNiCo’s metallic composition provides inherent resistance to oxidation, rust, and environmental wear, eliminating the need for protective coatings that can degrade or flake over time. This ensures long-term reliability in humid, industrial, or mildly corrosive conditions, reducing maintenance costs and extending service life compared to coated rare-earth alternatives.
· Precision 20×10×4mm Ring Geometry: The compact, precisely machined ring profile (outer diameter 20mm, inner diameter 10mm, thickness 4mm) offers a balanced combination of magnetic strength and space efficiency, enabling seamless integration into sensor assemblies, motor stators, and miniaturized instrumentation. Tight dimensional tolerances ensure perfect fit and alignment in mass-produced systems.
· Low Temperature Coefficient & Stable Magnetic Output: AlNiCo exhibits a very low temperature coefficient of remanence, meaning its magnetic flux density changes minimally with temperature fluctuations. This stability is critical for precision applications like aerospace navigation sensors and industrial process control equipment, where consistent magnetic performance is required for accurate, repeatable measurements.
· Excellent Mechanical Durability & Machinability: Sintered AlNiCo offers high mechanical strength and low brittleness compared to ceramic or rare-earth magnets, making these ring magnets resistant to chipping, cracking, and damage during installation or high-vibration operation. Their machinable composition also allows for custom modifications to the ring geometry if required for specialized applications.
· Wide Versatility Across Industries: These diametrally magnetized AlNiCo ring magnets are widely used in automotive speed sensors, flow meters, rotational encoders, aerospace instrumentation, industrial motors, and magnetic coupling systems, meeting the stringent requirements of precision engineering, high-temperature operation, and long-term reliability.
Product Details
Introduction
These diametrally magnetized AlNiCo ring magnets, precision-engineered at 20×10×4mm, are premium permanent magnets crafted from high-grade aluminum-nickel-cobalt alloy, designed for applications requiring consistent, directional magnetic fields and exceptional long-term stability. Manufactured via advanced sintering technology, they feature a hollow ring profile with strict dimensional tolerances, optimized for diametrally magnetization that delivers a uniform magnetic field around the central axis—an essential characteristic for precision sensors, flow meters, and rotational machinery. AlNiCo’s inherent thermal stability, natural corrosion resistance, and low temperature coefficient make these magnets ideal for use in environments where fluctuating temperatures and harsh operating conditions would degrade other magnet materials. The uncoated, smooth metallic finish preserves the magnet’s structural integrity and magnetic properties, eliminating the risk of coating degradation over time. Each magnet undergoes rigorous quality testing to ensure uniform magnetic performance, precise dimensional accuracy, and reliable diametrally field distribution, guaranteeing consistent operation in critical industrial, aerospace, and commercial applications.