Sep 15, 2026Industry Insights
N52 vs N45 Magnets: What a MagSafe Case Needs
A magnet's grade, not the word "strong," decides how firmly a MagSafe case holds. What N52 and N45 mean for wholesale buyers, and what to ask for in writing.
iFunSmart puts N52 magnets in the MagSafe cases buyers order most, because the grade decides how firmly a phone locks onto a charger, a mount, or a ring stand. When a supplier says only "strong magnet," the specification is missing. Ask for the grade number, in writing, and match it to how you will sell the case.
Last updated: September 15, 2026.
What a Magnet Grade Actually Means
iFunSmart buys neodymium magnets by grade, and the grade is the real specification hiding behind the word "strong." A neodymium magnet grade is the number that follows the letter N, and it names the material's maximum energy product. A higher number means a stronger magnet for the same size and shape, so N52 is a higher grade than N45, and N45 is higher than N42.
This scale is a material standard, not a brand claim. Any factory buying from a magnet supplier reads the same grade off the same chart. The useful question for a phone case is not whether a magnet is "strong." It is which grade, at what diameter, and behind how much case material.
N52, N45, and N42 in Plain Terms
The three grades sit on one ladder, and for a phone case the difference is holding force. An N52 ring of a given diameter holds tighter than an N45 ring of the same diameter, and N45 holds tighter than N42. The gap is not decorative; it decides whether a phone stays on a vent mount when the car turns or slides off a charger overnight.
For a MagSafe accessory the grade is doing constant work. The ring has to hold the phone through the case back, keep the charging coils aligned, and stay put when a buyer props the phone on a ring stand or flips open a kickstand. A weaker grade needs a larger or thicker ring to reach the same hold, and that changes the profile and the case design.
Why the Grade Alone Does Not Decide Hold
A case's real hold is set by four things together, and the grade is only one of them. The ring's diameter, the thickness of the back between magnet and phone, and the phone's own magnet array all matter as much as the N number. N52 in a thin, wide ring holds better than N52 in a small, recessed ring, so a supplier quoting only the grade is still leaving out most of the specification.
That is the boundary I ask buyers to keep in view. We can tell you the grade we build with, and we publish it for the lines where it matters, but we do not claim a single universal pull-force number for every case. Pull force depends on the phone model and the case design, and we do not publish one figure that pretends otherwise.
What the Number Does for a MagSafe Case
MagSafe works because Apple put a ring of magnets inside the back of the phone. A case adds a matching ring so the phone still snaps to chargers, mounts, wallets, and stands through the case, and that added ring has to bridge the gap the case creates. N52 is the grade we standardize on for the magnetic lines, including our detachable metal-button case with N52 magnets and our anti-yellowing N52 magnetic Bayer case.
One U.S. private-label buyer asked us to confirm N52 and N52H before ordering, with wireless charging compatibility on the same checklist. That is how the grade ends up in the purchase specification instead of the sales pitch, and it is the kind of request we are used to answering in writing.
A higher grade does not make charging faster. Charging speed is set by the charger and the phone, and the magnet's only job there is to hold alignment so the coils stay lined up. A case that holds alignment lets a buyer drop the phone onto a charger and walk away. A case that lets it slide stops charging, and for a wholesaler that difference shows up as returns.
Common Questions From Buyers
Does N52 matter if I only sell non-MagSafe cases?
No, and asking for it there is waste. The grade matters where a magnet is doing work: MagSafe alignment, a ring stand, a detachable button, or a snap-on camera cover. A plain snap-on case with no magnet has no grade to argue about, so spend the specification budget on fit and finish instead.
How do I verify the grade before I order?
Ask for the grade in writing, on the spec sheet or the order confirmation, not in a chat message. The figure to request is the N number, and ideally the ring dimensions. A factory that writes N52 on the order and can show the magnet supplier's grade is different in kind from one that only says "strong magnet." Order a sample and hold test it against a reference case before you commit the run.
Which grade should a private-label brand choose?
N52 when the brand promises a firm hold and sells mounts or stands; N45 or N42 when cost matters more than hold and the product is a light everyday case. The answer is not fixed, so decide per SKU rather than for a whole catalog at once. We carry a 2700GS magnetic case for iPhone 18 Pro Max for buyers who want a documented strong-hold option to compare against.
What to Do Next
The grade number is a small detail that decides a large part of how a MagSafe case is reviewed after the sale. Before you commit a MagSafe line, get the grade in writing, ask for the ring dimensions, and request a sample you can hold test yourself.
Tell us the models you plan to carry and whether you want MagSafe, ring stands, or both. We will confirm the grades we build with and send a sample so you can test the hold on your own reference phone.
Send us your models and MagSafe requirements, and we will confirm the magnet grades and send a hold-test sample.
Apple, iPhone, and MagSafe are trademarks of Apple Inc. iFunSmart is an independent manufacturer of phone cases and accessories, not affiliated with, authorized, sponsored, or endorsed by Apple. Product names are used solely to indicate compatibility.
