Magcraft NSN0586 1/2-Inch by 1/7-Inch by 1/8-Inch Rare Earth Ring Magnets, 12-Count
Rare earth magnets are the strongest type of permanent magnet currently made. They are amazingly powerful for their size and have innumerable uses. These countersunk ring magnets are 0.500-Inch (12.7-mm) outside diameter, 0.150-Inch (3.8-mm) inside diameter and 0.125-Inch (3.2-mm) thick. They are magnetized through the thickness. They are composed of grade 40 neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish. Their individual pull force is approximately 3-Pound. Maximum working temperature is 176-Degree Fahrenheit (80-Degree Celsius). Magnets may chip and crack if allowed to snap together.