Magnet Strength & Performance – Pull Force, Gauss & Magnet Size Guide

Welcome to the Aussie Magnets Magnet Strength & Performance guide.

Magnet strength is influenced by more than just the material. Pull force, surface gauss, magnet size, contact area, steel thickness, and air gap all affect how a magnet performs in real-world applications.

Understanding how magnet strength is measured helps you compare magnets more accurately and choose the right option for holding, mounting, separation, lifting, or engineering applications.

These guides explain the key factors that affect magnetic performance, from pull force and gauss through to size, distance, and steel contact conditions.

Pull Force

Pull force is one of the most common ways magnet strength is described. It refers to the force required to pull a magnet directly away from a thick, flat steel surface under ideal conditions.

While useful for comparison, pull force figures are usually measured in controlled test conditions and may not reflect how a magnet performs in your actual application.

Understanding pull force helps you compare magnets, but it should always be considered alongside contact area, air gap, and surface conditions.

→ View Pull Force Guide

Surface Gauss

Surface gauss measures the magnetic field strength at the surface of a magnet. It is commonly used to compare how intense the magnetic field is at a specific point.

A magnet with high surface gauss may have a very strong local field, but that does not always mean it will deliver the highest holding force in every application.

This guide explains what gauss means, how it is measured, and where it is useful when comparing magnets.

→ View Surface Gauss Guide

Magnet Size & Shape

Magnet size has a major effect on performance. In general, larger magnets can provide greater holding force, while thickness often affects field depth and reach.

Shape also matters. Disc, block, ring, rod, and pot magnets all perform differently depending on how the magnetic field is distributed and how the magnet contacts the target surface.

This guide explains how magnet dimensions and shape influence strength and suitability for different jobs.

→ View Magnet Size & Shape Guide

Steel Thickness & Contact

Magnet performance depends heavily on the steel surface it attaches to. Thick, clean steel gives the best result, while thin steel can limit the magnetic circuit and reduce holding force.

Full contact is also critical. Uneven, painted, curved, or textured surfaces can reduce the effective holding strength of a magnet.

This guide explains why the steel itself is such an important part of magnet performance.

→ View Steel Thickness & Contact Guide

Air Gap & Distance

Even a very small air gap can dramatically reduce magnetic performance. Paint, powder coating, rubber, plastic, adhesive layers, and simple spacing all weaken the magnetic connection.

The further the magnet is from the steel target, the more rapidly holding force drops away.

This guide explains how distance affects performance and why minimising air gap is one of the most important parts of good magnet design.

→ View Air Gap & Distance Guide

Real-World Performance

Real-world magnet performance is often very different from catalogue test figures. Shear force, sliding resistance, vibration, impact, mounting method, and surface finish can all affect how well a magnet works in use.

A magnet that performs well in a straight pull test may behave very differently on a vertical wall, a painted surface, or a moving assembly.

This guide helps explain the difference between test data and actual application performance.

→ View Real-World Performance Guide

Choosing the Right Strength

Selecting the right magnet strength means allowing for more than the stated pull force. In most cases, a safety margin should be built in to account for reduced contact, surface coatings, movement, and other losses.

Choosing a magnet that is too weak can lead to failure, while choosing one that is far too strong can create handling, installation, or safety issues.

This guide explains how to choose a magnet with the right balance of strength, size, and practicality.

→ View Choosing the Right Magnet Strength Guide

Understanding Magnet Strength & Performance

Understanding how magnet strength is measured helps you make better decisions when selecting magnets for industrial, commercial, workshop, and everyday applications.

By looking beyond simple pull force figures and considering gauss, size, steel thickness, air gap, and real-world use, you can choose a magnet that performs more reliably in practice.

These guides are written by the technical team at Aussie Magnets, an Australian supplier of industrial, commercial and specialist magnets since 1989.