3/4 x 0.075 Inch Neodymium Rare Earth Sewing Magnets N38 (1 Pair) SWP-M

SWP-M Specifications

• Magnetization Direction: The direction through which the magnet is magnetized. See our Magnetization Directions page for more details.
  North and south pair (outer face)
• Size: Size is the physical dimensions of the product using the standard unit of measure inches.
  0.75 x 0.075 Inch ( Diameter x Thickness )
• Metric Size: Metric size is the physical dimensions of the product in metric millimeters.
  19.05 x 1.91 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.
  3.97 lb (1.8 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
  N38
• 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.
  38 MGOe
• Tolerances: Dimensional tolerance specifies the allowed leeway for variations in manufacturing.
  ±0.004 in (.1mm)
• 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.
  Nickel-Copper-Nickel (Ni-Cu-Ni)
• Weight: This is the weight of a single magnet in ounces and grams.
  0.3306 oz (9.37 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.
  12,600 Gauss
• Pack Size: The number of products included in quantity 1 when added to cart. A pair means 2 products and a pack is a group of multiple products. Some products have multiple pairs in a single pack. Please be careful when placing into cart.
  1 Pair
• Color: The color of the coating or plating on the product.
  Silver

These great Sewing Magnets are designed especially for sewing into fabrics.  Great for purses, clasps, and many other magnetic attachments for clothing and other textiles.  These magnets also work great as magnetic clasps in binders, folders and other printed materials.  Sewing magnets are sold in matched pairs.  An order quantity of 1 gets you two magnets.

For items that are frequently washed, we recommend the plastic cover included on this magnet, which helps protect it from moisture.  For items that are infrequently washed, our SW-M is the same magnet without the plastic cover.  Machine wash cold, dry on low heat.

Choose your size based on the thickness of all material layers between the magnets in your application.  A pull force between 1 and 3 pounds is a good target, though the desired strength does depend on the application.  This magnet is great for a total material thickness of 0.02" to 1/8".

The table below shows the expected strength when used with a variety of materials.  The Pull Force assumes the magnets are separated by two layers of the fabric.