The prototyping phase is the most critical stage of any engineering project. Whether you are developing a new medical device or a high-speed robotics assembly, the magnets you choose can determine the success of your proof-of-concept. When ordering magnets for prototyping, a "one size fits all" approach often leads to costly delays.

To ensure your R&D remains on schedule and within budget, there are four technical factors you must evaluate before placing your order.

1. Selecting the Right Magnetic Grade 

Engineers often assume that the strongest magnet is always the best choice. However, selecting the appropriate grade involves balancing pull force against cost and physical constraints.

At Apex Magnets, we stock N48 neodymium magnets because we believe they offer the highest flux density for applications requiring maximum power in a small footprint. Check with our experts to determine whether your prototype requires a different grade or if another grade would work for your application. We can help ensure the grade matches your design’s needs and order exactly what you need.

2. Understanding Thermal Stability and Environment

Standard neodymium magnets begin to lose their magnetic properties at temperatures above 80°C (176°F). If your prototype will operate in a high-heat environment—such as near an engine or a high-voltage circuit—standard grades may fail.

When ordering magnets for prototyping, consider the following environmental factors:

  • Operating Temperature: Do you need high-temperature grades?
  • Corrosion Exposure: Will the magnet be exposed to moisture or chemicals?
  • Mechanical Stress: Neodymium is brittle; will it be subject to high-impact forces?

3. The Importance of Specialized Coatings

A prototype’s longevity often depends on its coating. While Nickel is the standard, it may not be suitable for every application. For example, dental prototypes require biocompatible coatings like gold or medical-grade epoxy. For outdoor industrial use, a plastic or rubber coating may be necessary to prevent oxidation and provide extra grip.

4. Tolerances and Precision Fit

In high-precision engineering, a fraction of a millimeter can be the difference between a functional assembly and a failed test. Most standard magnets have a tolerance of +/- 0.1mm. If your prototype requires tighter tolerances for a press-fit application, you must communicate these specs early in the procurement process.

Visualizing Your Scale with the Popular Size Grid

One of the most common mistakes when ordering magnets for prototyping is misjudging the physical dimensions in relation to the required pull force. A magnet that looks perfect on a CAD drawing may be difficult to handle or mount in a physical assembly.

To help you find the right fit without the guesswork, we recommend using our Popular Size Grid. This tool allows you to:

  • Compare Dimensions: Quickly see the difference between common disc, block, and ring sizes.
  • Filter by Strength: Match your size constraints with the necessary magnetic grade.
  • Streamline R&D: Identify "in-stock" sizes that can be shipped immediately for rapid prototyping.

Using the grid before you finalize your design can save days of revision time and ensure your prototype's housing is perfectly spec'd for a standard magnet size.

Custom Magnet Solutions

Sometimes, a prototype requires a specific geometry or magnetic orientation that simply isn't available in standard stock. Whether you need a unique shape for a robotics assembly or a specific coating for a medical device, custom order options are often the most efficient path forward.

At Apex Magnets, we specialize in bridging the gap between a blueprint and a finished component. By submitting a custom magnet request, you can specify:

  • Non-Standard Grades: While N48 are our common size, we can source specialized grades for your unique flux requirements.
  • Complex Geometries: From custom arc segments for motors to micro-discs for sensors.
  • Specialized Plating: Options beyond standard nickel, including Gold, Silver, Epoxy, or Plastic coatings.
  • Custom Magnetization: Need a radial or multi-pole orientation? We can manufacture your exact field map.

At Apex Magnets, we help manufacturers, engineers, and sourcing teams select the right magnet for their prototypes the first time. Whether you need custom magnet solutions, stocked inventory, or long-term purchasing options, our team is here to help. Contact our B2B team today to discuss your next project: ApexMagnets.com/b2b

 

Safety Warning: Children should not be allowed to play with neodymium magnets as they can be dangerous. Small magnets pose a choking hazard and should never be swallowed or inserted into any part of the body.

Magnets can be dangerous. Neodymium magnets, especially, must be handled with care to avoid personal injury and damage to the magnets. Fingers and other body parts can get severely pinched between two attracting magnets. Bones can be broken by larger magnets. Visit our Magnet Safety page to learn more.