8 x 20 x 20 mm Magnetic Stir Bar N42H STIR20

STIR20 Specifications

• Magnetization Direction: The direction through which the magnet is magnetized. See our Magnetization Directions page for more details.
  Axial (through thickness)
• Size: Size is the physical dimensions of the product using the standard unit of measure inches.
  0.315 x 0.787 x 0.787 Inch ( Diameter x Length x Thickness )
• Metric Size: Metric size is the physical dimensions of the product in metric millimeters.
  8 x 20 x 20 mm ( Diameter x Length x Thickness )
• Grade:

  Grade N

  Min: -238°F (-150°C) Max: 176°F (80°C)

  Hover over grades for temp info:

  • N
  • NM
  • NH
  • NSH
  • NUH
  • NEH
  • NAH
  N42H
• Max Operating Temp: Maximum operating temperature, also known as maximum service temperature, is the temperature at which the magnet may be exposed to continuously with no significant long-range instability or structural changes. Learn more in our Temperature and Neodymium Magnets article.
  248°F (120°C)
• Material: This lists the name of the material each product is composed of.
  Neodymium (NdFeb)
• BH Max: BH max is the Maximum Energy Product at the point on the B/H Curve that has the most strength, expressed in MGOe (MegaGaussOersteds). When describing the grade of a neodymium magnet, this number is commonly referred to as the "N" number, as in Grade N52 magnets. Learn more about Bh max in our glossary.
  42 MGOe
• Tolerances: Dimensional tolerance specifies the allowed leeway for variations in manufacturing.
  ±0.1 in (2.5mm)
• Coating: Most neodymium magnets are plated or coated in order to protect the magnet material from corrosion. Check out our Custom Magnets for unplated magnets and other coatings not stocked for this size magnet. Learn more about all available platings and coating in our What Magnet Coating Should I Use? article.
  Molded PTFE, White
• Weight: This is the weight of a single magnet in ounces and grams.
  0.1072 oz (3.04 g)
• Br Max: Br max is also called "Residual Flux Density" and is when the magnetic induction remaining in a saturated magnetic material after the magnetizing field has been removed. This is the point at which the hysteresis loop crosses the B axis at zero magnetizing force, and represents the maximum flux output from the given magnet material. By definition, this point occurs at zero air gap, and therefore cannot be seen in practical use of magnet materials. Learn more about Br max in our glossary.
  13,200 Gauss
• Color: The color of the coating or plating on the product.
  White

These neodymium stir bar magnets consist of a powerful neodymium magnet encased in a molded layer of PTFE. The shape includes a molded ridge, or pivot ring to make rotation easier and smoother. Stronger than comparable Alnico magnets, these neodymium stir bars do not tend to demagnetize over time. Made with N42H grade magnets, these magnets are suitable for high temperatures up to 120ºC.