Import Alnico Magnet Ring Shaped Alnico 8 Magnets — Buy in wholesale FOB from Supplier in China

Shanghai United Metal Materials supplies cast AlNiCo 8 ring magnets manufactured from an aluminum-nickel-cobalt-iron alloy, designed for applications where thermal resilience and stable magnetic output are critical. The AlNiCo 8 grade delivers a typical residual induction (Br) of 1.05-1.15 T and coercive force (Hcb) around 115-145 kA/m, with maximum operating temperatures reaching 500C before irreversible flux loss occurs. These ring-shaped magnets suit rotary assemblies, sensor housings, and meter mechanisms where dimensional precision and magnetic consistency over thermal cycling are non-negotiable. The supplier lists additional magnet materials including sintered and bonded NdFeB, hard ferrites, SmCo, rubber magnets, and soft ferrites, indicating vertical coverage across permanent magnet technologies.

Cast AlNiCo 8 magnets achieve their anisotropic magnetic properties through directional solidification in a magnetic field, followed by heat treatment and controlled cooling, a process that orients the magnetic domains along a preferred axis. The ring geometry allows concentric pole configurations or through-shaft mounting in motor rotors, tachometers, and analog instrumentation. Compared to sintered AlNiCo variants, cast grades offer superior energy product and temperature coefficient stability, though with slightly wider dimensional tolerances typical of casting processes. Standard industry tolerances for cast AlNiCo rings are typically +/-0.25 mm on outer diameter and +/-0.15 mm on inner diameter for ground surfaces, though buyers should confirm Shanghai United Metal Materials' specific grinding capabilities and inspection protocols.

Primary applications span automotive sensors (crankshaft, camshaft position sensing), aerospace instrumentation, electricity meter damping systems, and industrial holding fixtures. Buyers in these sectors typically procure ring magnets in matched sets with paired magnetic moments for balanced rotor assemblies. Trade terms, minimum order quantities, and lead times are not specified in the listing data and should be confirmed directly with Shanghai United Metal Materials, whose offices are located at Shangkai Building, Kunming Road, Shanghai. Surface treatment options noted across the supplier's broader catalogue include nickel, zinc, chromium, copper, aluminum plating, and epoxy resin coating or spray coating, suggesting capability to specify corrosion protection for marine or chemically exposed installations.

Shanghai United Metal Materials operates from offices at Shangkai Building, No.1209 Kunming Road, Shanghai 200092, China, placing it within one of China's principal industrial magnet supply corridors. The supplier's trust tier is listed as 'harbor' with a response rate of 0.00% and zero recorded average response hours, indicating either a newly registered account or inactive inquiry management at the time of data capture. Buyers should note this responsiveness signal and consider direct outreach via multiple channels to confirm current trading status and technical support availability.

The company lists extensive magnet material capabilities spanning bonded and sintered NdFeB, hard ferrites (Sr and Ba based), SmCo (1:5 and 2:17 stoichiometries), cast and sintered AlNiCo, rubber magnets, soft ferrites (Mn-Zn and Ni-Zn), and injection-moulded NdFeB/ferrite composites. This breadth suggests trading or manufacturing relationships across multiple magnet supply chains rather than sole specialisation in AlNiCo. The listing does not state factory ownership, ISO certification, export licence details, or reseller relationships, so buyers should verify manufacturing provenance and quality management system scope directly.