Magnet Grades Explained

Magnet grades are used to measure the strength and performance of a magnet. They are most commonly associated with neodymium magnets, where grades such as N35, N42, and N52 indicate how powerful the magnet is.

In simple terms, the higher the grade, the stronger the magnet. However, choosing the highest grade is not always necessary. The right magnet grade depends on your application, operating environment, available space, and budget.

Understanding magnet grades can help you choose a magnet that delivers the right level of performance without overspending on unnecessary strength.

What Do Magnet Grades Mean?

Neodymium magnet grades begin with the letter “N” followed by a number. The number refers to the magnet’s maximum energy product, which measures the amount of magnetic energy the material can produce.

For example:

• N35 magnets provide reliable, general-purpose magnetic strength
• N40 magnets offer increased holding power
• N42 and N45 magnets are commonly used for stronger commercial and industrial applications
• N52 magnets are among the strongest standard neodymium magnets available

A higher grade means a stronger magnetic field for the same magnet size. This allows smaller magnets to achieve greater holding force, which can be useful in compact applications where space is limited.

Magnet Grades At A Glance 

*Temperature resistance can vary depending on the magnet’s coating, shape, operating environment, and whether a high-temperature grade is used. Always confirm suitability for your specific application before purchase.

Why Magnet Grades Matter

Choosing the correct magnet grade affects both performance and cost. A magnet that is too weak may not provide enough holding force, while a magnet that is unnecessarily strong can increase costs and make handling more difficult.

For many everyday applications, lower grades such as N35 provide more than enough strength. They are widely used in retail displays, packaging, signage, workshops, and general engineering tasks.

Higher grades are often chosen for more demanding applications where maximum magnetic force is required in a smaller space. This includes motors, specialist equipment, electronics, manufacturing systems, and technical assemblies.

The goal is to choose a magnet grade that matches the demands of the application rather than automatically selecting the strongest option available.

Common Neodymium Magnet Grades

N35 Magnets

N35 magnets are a popular choice for general-purpose applications. They offer a reliable balance of strength, practicality, and cost effectiveness.

They are commonly used in:

• Displays and signage
• Packaging
• Light engineering
• Workshop use
• Magnetic fixings

N35 magnets are ideal when dependable performance is needed without the extra cost of higher-strength grades.

N40 and N42 Magnets

N40 and N42 magnets provide greater magnetic force while remaining suitable for a wide range of commercial and industrial uses.

They are often chosen for:

• Engineering assemblies
• Mounting systems
• Magnetic closures
• Technical equipment
• Manufacturing applications

These grades are useful when additional holding power is required but extreme strength is not essential.

N52 Magnets

N52 magnets are among the strongest standard neodymium magnets available. They deliver maximum magnetic performance in a compact size.

They are commonly used in:

• High-performance engineering
• Specialist manufacturing
• Precision equipment
• Compact technical devices
• Applications with limited installation space

Because of their strength, N52 magnets require careful handling and are usually selected for more demanding or specialist applications.

Magnet Grades and Heat Resistance

Magnet grade affects more than just strength. Temperature resistance is also important when selecting a magnet.

Standard neodymium magnets can begin to lose magnetic performance when exposed to high temperatures. In applications involving heat, specialised high-temperature grades may be required to maintain performance safely and consistently.

This is one reason why some industries choose ceramic magnets instead. While ceramic magnets are weaker than neodymium magnets, they perform more reliably in high-temperature environments.

When selecting a magnet, it is important to consider:

• Required holding force
• Operating temperature
• Installation space
• Environmental conditions
• Budget and long-term durability

Balancing these factors helps ensure the magnet performs reliably over time.

Choosing the Right Magnet Grade

The best magnet grade depends entirely on the application.

If you need a practical, cost-effective solution for general use, a lower grade such as N35 may be the best option. If your application requires stronger holding force in a compact space, higher grades such as N42 or N52 may be more suitable.

Choosing the right grade can improve performance, reduce unnecessary costs, and ensure safer, more reliable operation.

Find the Right Magnet Grade

At Jobmaster Magnets, we supply a wide range of neodymium magnets in different grades, sizes, and shapes to suit commercial, industrial, and general-purpose applications.

Whether you need an economical everyday solution or maximum magnetic strength, our range makes it easy to find the right magnet for your project.

Need a custom quote? Contact our team today and we will be happy to help you find the right solution for your requirements.