Button Magnets are simply horseshoe magnets in a compact circular format. They are made from Alnico to provide a high resistance to corrosion and a high temperature rating. All sizes have clearance holes for mounting. They must not be recessed into ferrous materials as it will short circuit the magnetism.
Maximum operating temperature: 500°C.
The E-Magnets 824 Button Magnet has the following specifications:
Diameter: 32mm (1.1/4 inch).
Height: 25.4mm (1 inch).
Maximum Pull: 4.8kg.