Introduction To The Grades Of Neodymium Magnets

• Posted by xingci xingci September 4, 2022 - Filed in Business - #Neodymium Magnets  - 516 views

  　  Neodymium magnets are available in different grades such as N42, N52, or N42SH. What do these numbers mean? How does the rating relate to the strength of the magnet? Do magnets have a Gaussian number?

  　　What is a magnet rating?

  　　Magnet grade is a good indicator of magnet strength. Generally speaking, the higher the number, the stronger the magnet. This number comes from the actual material property, the maximum energy product of the magnet material, expressed in MGOe (Mega Gauss Oersteds). It represents the strongest point on the magnet demagnetization curve or BH curve. The pull force of the magnet varies with the grade or N number. Double the N number and you'll find roughly double the pull.

  　　How do measure the strength of a magnet?

  　　It depends on the meaning of power. Two common measures of magnet strength are tensile force and magnetic field strength. Pull force is the force with which you have to pull the magnet away from something (such as a steel surface or other magnet). We show this force in pounds on our website, although you can also express it in newtons or even kilograms. The specific way you test the magnet can have a huge impact on the measured strength.

  　　Magnetic field strength is a measure of the strength and direction of the magnetic field at a specific point near a magnet. It is expressed in Gauss or Tesla (1 Tesla = 10,000 Gauss). It depends on the size, shape, and grade of the magnet, where the measurement is being taken, and whether there are any other magnets or ferromagnetic materials nearby.

  　　What magnetic pole should I choose?

  　　It depends on the application. If you need the highest strength at room temperature in the smallest possible package, the N52 grade is the toughest.

  　　Many of our magnets are available in an N42 rating, offering a good balance of cost, strength, and performance at higher operating temperatures. By using a slightly larger N42 magnet you can get the same strength as an N52 magnet.

  　　In the 140°F to 176°F range (60°C -80°C), N42 magnets may actually be stronger than N52 if the temperature is raised slightly. This is especially true if your magnet shape is very thin. For higher temperatures, consider some of our N42SH-rated high-temperature magnets.

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