You snap a wallet onto your MagSafe case and it slowly slides down, or a car mount drops your phone over a bump. The case has magnets, so why is the hold weak? The answer is in the magnet grade and how it is measured.
How Magnet Strength Is Measured
Two terms matter. Gauss measures magnetic field strength, but for holding power the more useful number is pull force, measured in grams or newtons: how much weight the magnet can hold before it slips. Neodymium magnets are graded by strength, from N35 up to N52. A higher number means a stronger magnet of the same size.
Why Cheap Cases Slip
Budget magnetic cases often use fewer or weaker magnets (N35-N40) or a thin magnet ring, so pull force is low and heavy accessories slide. A quality MagSafe case uses a full ring of N52-grade magnets rated for around 1,000 to 1,500 grams of pull, which holds a phone plus a mounted accessory securely. A strong magnetic accessory like this magnetic power bank needs an equally strong case to stay put.
What to Look For
Check for N52 magnets and a stated pull force above 1,000 grams. A full 360-degree magnet ring beats a partial one. Browse magnet-ready options in the accessories collection.
Frequently Asked Questions
What pull force do I need? For a phone alone, around 800 grams is fine. To hold a phone plus a wallet or on a car mount, look for 1,000-1,500 grams of pull.
What does N52 mean? It is the strongest common grade of neodymium magnet. Grades run N35 to N52; higher numbers hold more for the same magnet size.
Can a case be too strong? Not for holding, but very strong magnets can make the case slightly harder to pull off a charger. That trade-off is worth it for secure accessories.
If your accessories slide, the magnets, not MagSafe, are the problem. Look for N52 magnets and high pull force for a grip that actually holds.