1/2 Inch Neodymium Rare Earth Sphere Magnet N42 S8

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S8 Specifications

Dimensions: This shows the name of each dimension and how it is measured in the image.
Magnetization Direction: The direction through which the magnet is magnetized. See our Magnetization Directions page for more details.
Axially Magnetized
Size: Size is the physical dimensions of the product using the standard unit of measure inches.

0.5 Inch ( Diameter )
Metric Size: Metric size is the physical dimensions of the product in metric millimeters.

12.7 mm ( Diameter )
Pull Force 1: Pull force case 1 represents a magnet attracting to a thick steel plate. Learn more about Magnet Pull Force Case 1.

6.53 lb (2.96 kg)
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.

7.79 lb (3.53 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)
Surface Field: Surface field is the magnetic field strength at the surface of the magnet as measured by a Gauss meter. Our Surface Field Table is a comprehensive table of the surface field for all of our stock magnets. Learn about magnet surface field calculations in our Surface Fields 101 article.

8815 Gauss
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.
±0.004 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. Variety packs (with mixed sizes) show the overall weight.

0.2838 oz (8.05 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.

Silver

Product Description

The s8 sphere magnet has a 1/2" diameter, is magnetized through its axis (diameter) 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 temperatures up to 176°F (80°C).

The s8 is a small, round ball magnet that works well in tight spaces where a compact magnet with strong holding force is needed. Its 1/2" 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.

Common Applications

Models & Miniatures - Building models, miniatures, and hobby projects.
Joints & Pivots - Creating movable joints, pivots, and adjustable connections.
Magnetic Sculptures - Building magnetic sculptures and geometric structures.
Accessories & Crafts - Making accessories, decorative objects, and craft projects.
Science Experiments - Creating science experiments and magnetic field demonstrations.
Games & Puzzles - Making magnetic games, puzzles, and interactive objects.
Prototypes - Creating prototypes with self-aligning magnetic connections.
Robotics & Mechanics - Building robotics and small mechanical assemblies.
Movable Displays - Making movable or repositionable display components.

Product Features

Spherical Shape - Round geometry provides the same physical profile in every direction without edges or corners.
Free-Rotating Design - Spheres can rotate easily, allowing the magnet to naturally orient its poles toward another magnet or ferrous object.
Self-Aligning Connection - When paired with other magnets, magnetic attraction allows spheres to rotate into a favorable magnetic orientation.
Compact Magnetic Form - Provides neodymium magnetic performance in a small, space-efficient shape.
Point Contact - The curved surface creates a small contact area, useful for pivoting, positioning, and movable magnetic connections.
Smooth Rounded Surface - No sharp corners or straight edges, making spheres well suited for decorative and tactile applications.
Flexible Magnetic Connections - Spherical geometry allows connected parts to pivot or change angle rather than remaining fixed in one orientation.
Easy to Embed - Can be incorporated into appropriately sized spherical or recessed cavities in prototypes and custom assemblies.
Useful for Magnetic Field Demonstrations - The simple three-dimensional shape makes sphere magnets useful for exploring magnetic attraction, repulsion, and pole orientation.
Permanent Magnet - Remains magnetized without requiring electricity, batteries, or an external power source.
Rare Earth Neodymium Magnet - The strongest type of permanent magnet available, providing exceptional strength for its size.