R421 Specifications
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Dimensions: This shows the name of each dimension and how it is measured in the image.
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Magnetization Direction: The direction through which the magnet is magnetized. See our Magnetization Directions page for more details.
Magnetized Through Thickness
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Size: Size is the physical dimensions of the product using the standard unit of measure inches.0.25 x 0.125 x 0.062 Inch ( Diameter x ID x Thickness )
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Metric Size: Metric size is the physical dimensions of the product in metric millimeters.6.35 x 3.17 x 1.59 mm ( Diameter x ID x Thickness )
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Pull Force 1: Pull force case 1 represents a magnet attracting to a thick steel plate. Learn more about Magnet Pull Force Case 1.0.95 lb (0.43 kg)
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Pull Force 2: Pull force case 2 represents a magnet attracting to a thick steel plate on both sides. Learn more about Magnet Pull Force Case 2.2.7 lb (1.22 kg)
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Grade:Hover over grades for temp info:Grade N
Min: -238°F (-150°C) Max: 176°F (80°C)
- 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)
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Material: This lists the name of the material each product is composed of.Neodymium (NdFeb)
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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
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Tolerances: Dimensional tolerance specifies the allowed leeway for variations in manufacturing.±0.004 in (.1mm)
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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)
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Weight: This is the weight of a single magnet in ounces and grams. Variety packs (with mixed sizes) show the overall weight.0.01 oz (0.28 g)
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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
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Color: The color of the coating or plating on the product.Silver
The r421 ring magnet has a 1/4" diameter, 1/8" ID and 1/16" thickness and has a hole in the
center. It is magnetized through thickness and is coated with a nickel copper nickel plating
providing a smooth and durable surface that helps protect the magnet from corrosion. Made from
N42 grade material, this magnet has a high size to strength ratio and can handle max operating
temperatures up to 176°F (80°C).
The r421 is a powerful ring shaped magnet that works well in tight spaces where a compact magnet
with strong holding force is needed. Its small 1/4" outer diameter makes it a versatile choice
for hobbyists, makers, engineers, designers, and educators working on models and miniatures,
3D-printed parts, crafts, small electronics, prototypes, robotics, hidden closures, and
lightweight mounting applications. It can also be embedded into products and enclosures or used
to align removable parts and hold small components during assembly.
Product Description
Common Applications
Product Features
R421 Technical Data
- Pull Force Case 1: Distance strength chart for magnet attracting to a thick steel plate. View Chart
- Pull Force Case 2: Distance strength chart for magnet between two thick pieces of steel plate. View Chart
- Pull Force Case 3: Distance strength chart for two identical magnets attracting to each other. View Chart
- Pull Force Case 4: Distance strength chart for two identical magnets repelling each other. View Chart
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Magnetic Field: FEA magnetic field line diagram. View Chart
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Bh Curves: Bh demagnetization curve data. View Chart
R421 Spec & Certificate Downloads
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