3 x 1/2 Inch Neodymium Rare Earth Rubber Coated Disc Mounting Magnet N42 (1/4"-20 screw) RMD-B-Z0

RMD-B-Z0 Specifications

• Magnetization Direction: The direction through which the magnet is magnetized. See our Magnetization Directions page for more details.
  Alternating north and south on steel disc
• Size: Size is the physical dimensions of the product using the standard unit of measure inches.
  3 x 0.5 Inch ( Diameter x Thickness )
• Metric Size: Metric size is the physical dimensions of the product in metric millimeters.
  76.2 x 12.7 mm ( Diameter x Thickness )
• Pull Force 1: Pull force case 1 represents a magnet attracting to a thick steel plate. Learn more about Magnet Pull Force Case 1.
  165 lb (74.84 kg)
• 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
  N42
• 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.
  176°F (80°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.
  ±0.01 in (.25mm)
• Weight: This is the weight of a single magnet in ounces and grams.
  9.98 oz (282.93 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
• Hole Size: This is the size hardware that best fits the magnet hole size.
  1/4"-20 screw
• Color: The color of the coating or plating on the product.
  Black

This silicone rubber coated mounting magnet is another new, water resistant design available at K&J Magnetics. It allows for easy mounting with a common screw.

The best feature of these magnets is their high-friction silicone rubber coating. When mounting objects to a vertical surface (i.e., a steel wall), these magnets are great for holding up objects without excessive or expensive magnetic strength.

These magnets are water resistant, but not strictly waterproof. The zinc plated magnets are encased in rubber, but a small area of steel is exposed. For more rust resistance, consider caulking the hole and your screw after installation.