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What You Must Know When Ordering Custom Neodymium Magnets

What is a Custom Neodymium Magnet?

A custom neodymium magnet is a neodymium magnet that is fabricated and machined according to a customer’s requirements. People often need neodymium magnets in applications. A simple neodymium disc magnet also needs custom because equipment need-specific dimensions of neodymium magnets. So the reason is easy to understand. For instance, a common device also often requires their accessories neodymium magnets’ tolerance to be controlled at +/- 0.05mm or, more accurately, maybe +/- 0.005mm. Custom is usual in neodymium magnets, but not only because it needs to customize a special shape.

What to Provide When Ordering Custom Neodymium Magnets?

ROBO Magnetic is a seasoned manufacturer and supplier of custom neodymium magnets to Europe, Asia, and America. But for us to deliver the exact production of custom neodymium magnets you need for your project, you must provide certain information. They are:


Because of the complexity of the production process of neodymium magnets, there are many factors we must consider when producing them to make sure that they meet the customer’s requirements.

For instance, we must have a drawing of the shape the customer wants. The drawing must come with the dimensional tolerances, magnetization direction, location and measure of the chamfer angle and countersunk hole, temperature rating, and more.

Suppose the customer does not provide some drawings of the neodymium magnet they want. In that case, information is incomplete, and the text or oral description may be misunderstood, resulting in the production of a wrong shape and a total waste of time and resources.

So when ordering custom neodymium magnets, we require customers to provide a drawing like this.

Along with the drawing of the desired shape, we will also require the following information to help us produce the exact neodymium magnet you want:


Customers must provide the dimensions of the neodymium magnet they want because the size of a neodymium magnet is essential to its application. Suppose a neodymium magnet is too big or too small for its intended use; it becomes useless. So, we must have the exact measure of the dimensions of the neodymium magnet you want.

In the diagram, you will provide:

  • Length: this is how long you want the neodymium magnet to be from the front to the back. e.g., 15mm.
  • Width: the width is how wide the neodymium magnet should be from left to right, e.g., 10mm.
  • Height: the height refers to measuring the neodymium magnet from the top to the base, e.g., 5mm.

For neodymium disc/cylinder magnets, you must provide the following:

  • Diameter: the diameter refers to the neodymium magnet’s surface (top/bottom) when measured across the center from edge to edge, e.g., 12mm.
  • Thickness: the measurement from the top edge to the bottom edge. Typically, a neodymium disc magnet will have a smaller thickness than the diameter, e.g., 1mm. On the other hand, the neodymium cylinder magnet will have a much longer thickness than the diameter, e.g., 40mm.


The customer must also provide their desired Grade of neodymium magnet. There are many grades of neodymium magnets, all with different strengths, remanence(Br), operational temperature resistance, cost, and others.

According to the properties of neodymium magnet magnetic attraction, our neodymium magnet grades typically range from 33 MGOe to 52 MGOe, N33 being the minimum and N52 being the top Grade. This comprehensive chart provides detailed information about the remanence(Br), coercive force(bHc), intrinsic coercive force(iHc), maximum energy product(BH)max, and the working temperature of our neodymium magnets grades.


Many times, the operating temperature of a neodymium magnet determines its working environment and use. Referencing our neodymium magnet grades chart, our lowest neodymium magnet grade, N30, has a working temperature of ≤80°C, while our maximum Grade, N35EH, has an operating temperature of ≤200°C.

Neodymium Magnet with Countersunk Holes

Customers ordering custom neodymium magnets with countersunk holes will provide information about the neodymium magnet and the countersunk hole. We must have the following information:

  • The angle of Countersunk Hole: there are six standard angles of countersink: 60°, 82°, 90°, 100°, 110°, and 120°. While 82°and 90° are the most popular, customers should provide their desired angle of the countersunk hole.
  • Dimensions: for the countersunk holes to match the screw intended, customers must also provide measurements for the countersunk head, including the outside and inside diameter, countersunk angle, chamfer angle, and tolerance.
  • Position: customers should label the specific dimension position for the countersunk holes on the neodymium magnet, center, or elsewhere.


Tolerance refers to the permissible differences between the finished product and the dimensions you requested. Ideally, you should state in “plus or minus” form, e.g., ±0.05.

When ordering custom neodymium magnets, customers should specify the dimensional tolerances; it is essential to prevent inconsistency with dimension application. Provide plus tolerance, negative tolerance, or plus-negative tolerance for the following:

  • Block: tolerance of length, width, and height.
  • Disc and Cylinder: tolerance of diameter, thickness.
  • Ring and Tube: tolerance of outside diameter, Internal diameter, thickness.


Customers should specify the angle of the chamfer and its dimensions and represent it in a drawing.


Neodymium magnets are highly prone to corrosion as they contain iron. Hence, depending on their application, they must be coated to protect them from moisture and other substances.

Typically, our neodymium magnets are coated in 3 layers: nickel + copper + nickel. However, customers can refer to our neodymium magnets coating page to see available options.

Magnetizing Direction

During production, neodymium magnets are designed to have a single magnetization direction so they can be as strong as possible. If they are made to be able to magnetize in any direction, then they won’t be able to focus their strength when attached to an object.

Nothing can change a neodymium magnet’s magnetization direction after its production is complete. Customers must specify their desired magnetizing direction beforehand. For full details, reference our magnetizing direction page.


A spacer is a material that we use to separate neodymium magnets to reduce the attraction between them during storage or shipment. The spacer will make it easier to detach them from one another. Basically, the stronger the neodymium magnet, the thicker the spacer.

We use different materials for neodymium magnet spacers, including heavy cardboard or plastic. But customers who want unique spacer materials should offer material requirements.


At ROBO Magnetics, we commonly ship our neodymium magnets using an iron sheet magnetic isolation packaging. Customers who want special packaging should offer dimension requirements.

Shapes of Neodymium Magnets

There are numerous shapes of neodymium magnets, from standard shapes to irregular shapes. We explore some of these below.


Neodymium disc magnets are among the most popular magnet shapes and have various applications. They can be used at home, school, and office.


Block neodymium magnets are also among the popular standard shapes we have. They are usually 6-sided with straight sides and can come in cubes or rectangles.


Neodymium cylinder magnets are long and circular, and their height is often longer than their diameter, so they have a rod-like appearance. They can generate more prominent and stronger magnetic fields up to 3 times more potent than thinner neodymium disc magnets of equal diameter and rating.


Neodymium ring magnets are circular and typically have a shorter height than their diameter. They also have large holes within their diameter. They are different from neodymium magnets with countersunk holes because their holes are usually way wider than screws.

Ring with Countersunk Hole

Neodymium ring magnets with countersunk holes are equally versatile as ordinary neodymium ring magnets. For special applications, you can screw these neodymium magnets to other objects such as walls or wooden rods.


Neodymium arc magnets are identified by their curved shape and have a specialized application. These neodymium magnets are primarily found in rotors, motors, stators, generators, and alternators.


Ball and sphere neodymium magnets are mainly produced in a bunch as toys. They have a somewhat limited application because of their shapes and their small size. But someone who has the toy can rearrange them into any shape.

Neodymium Tube/block Magnets with Countersunk Holes

Neodymium magnets with countersunk holes usually have a more powerful working surface because the magnetic force is focused there. Their applications include mounting, holding, lifting, and positioning furniture, items, door latches, and frames.

Neodymium Irregular Magnet

Neodymium irregular magnets are neodymium magnet shapes that don’t fit or belong to balls, rings, arcs, spheres, discs, and blocks.

Neodymium Thin Type Magnet

Neodymium thin-type magnets are usually flat and lightweight. Often, they are found in consumer products such as earpieces, smartphones, small radios, and more. Most times, they are zinc-plated.

Neodymium Mini Magnet

These are tiny little bits of neodymium magnets that come in different shapes. They are almost always found in consumer products to make covers and lids for lipstick covers and jewelry boxes. They can also be found in smartphones, magnetic toys, and others.

Neodymium Fishing Magnet

Neodymium fishing magnets are often round in shape and usually have an iron hoop where you can tie a rope to let the neodymium magnet down into a body of water. You can use them to search for and pick up lost items in drainages, rivers, and holes.

Self-adhesive Neodymium Magnet

A self-adhesive neodymium magnet is a neodymium magnet with sticky stickers, usually used for daily convenience.

Pin Neodymium Magnet

Pin neodymium magnets are usually small but have a reasonably strong magnetic force. They are often used in offices to hold sheets of paper to magnetic whiteboards.

Single Giant Neodymium Magnet

A single giant neodymium magnet is usually used in wind power generation, heavy industry, personal experiments, etc.

Where to Get Quality Custom Neodymium Magnets?

ROBO Magnetic is a leading manufacturer and supplier of custom neodymium magnets meeting customer requirements worldwide. Our experts can fabricate neodymium magnets in different shapes, sizes, compositions, strengths, and ratings. We offer a diverse range of neodymium magnet alloys that can be used in various applications. Contact us today to discuss your requirements. We promise you the best service in the industry.


Article by

ROBO Magnetic Product Team

We are the manufacturer with 16 years of experience in custom neodymium magnets.

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