N48 vs N52 is the comparison you reach when you already want a high-flux neodymium magnet and you are deciding whether the top standard grade earns its premium. Usually you are space-constrained — a speaker motor, a Qi2 charging ring, a sensor that has to fit a fixed cavity. The honest answer surprises people: the strength gap is smaller than the grade numbers suggest, and N52 is not always the smart buy.
What do the N48 and N52 grades mean?
Because neither carries a temperature suffix, both share the same 80°C maximum operating temperature. So this is a pure strength-versus-cost-versus-space decision, not a thermal one — the opposite of a comparison like N42 vs N42SH, where heat is the whole story.
| Property | N48 | N52 |
|---|---|---|
| Max energy product (BHmax) | 45–49 MGOe | 50–53 MGOe |
| Remanence (Br) | ~1.38–1.42 T | ~1.43–1.48 T |
| Surface field (typical) | 13.8–14.2 kGs | 14.0–14.5 kGs |
| Max operating temperature | 80°C | 80°C |
| Relative strength | Baseline | ~8–10% higher |
| Manufacturing yield | Higher / more stable | Lower, more brittle |
| Relative price | Baseline | +10–20% |
How big is the real strength difference?
This is the part procurement teams under-appreciate. Switch the metric in the tool below: BHmax — the lab rating on the datasheet — differs by about 10%, but surface field, the number your magnetic circuit actually feels, differs by only about 2%.
The grade gap vs the real gap
N48 and N52 by the metric that matters. Switch metrics and watch the gap shrink.
Whether that gap matters depends entirely on whether you are space-constrained. If your design has a fixed cavity and you need every last gauss inside it — a compact speaker motor, a slim wireless-charging ring, a tightly packed sensor — N52 buys field you cannot get any other way. If you have a few millimetres to spare, there is a cheaper route.
The design lever: size up N48 to match N52
Experienced motor and connector designers reach for this constantly: push to N52 only when space is truly fixed; otherwise add a little volume to an N48 and match the force. Use the tool to see how much thickness it takes — for most thin parts it is a fraction of a millimetre.
N52 force from an N48 magnet
Either pay for N52's extra ~9% in the same size, or size up an N48 to match. Set your reference thickness.
Illustrative ~9% force / ~10% thickness rule — real numbers depend on geometry, air gap, and the steel interface.
Watch the air gap. If the magnet sits behind a 0.5–1 mm plastic housing — a connector, a sealed sensor — the field your part actually delivers drops with distance, and the N52-vs-N48 gain can shrink further. Reduce the air gap or add contact area before paying for a higher grade.
Why N52 is harder to make: yield, brittleness, sourcing
This matters most at production scale. Very high grades chip more easily during machining and handling, and the rejection rate climbs with part size and geometric complexity — N48 is generally more forgiving on the assembly line. If you are ordering thousands of parts on a fixed schedule, N48 can deliver better on-time, in-spec delivery than N52; lead time and consistency are part of the real cost, not just the per-unit price. If you want the strongest standard grade on its own, see our N52 neodymium magnets page and the deeper write-up on what N52 magnets are and where they fit.
Which applications suit N48 vs N52?
| Application | Binding constraint | Recommended |
|---|---|---|
| Slim speakers / headphones | Thickness | N52 |
| Qi2 / MagSafe charging arrays | Field in a fixed ring | N52 |
| Precision sensors, MRI parts | Field in fixed cavity | N52 |
| Compact / miniature motors | Space | N52 |
| High-efficiency generators | Cost & volume | N48 |
| Magnetic separators, clamps | Total force, has room | N48 |
| Large / complex geometries | Yield & consistency | N48 |
Remember the 80°C ceiling on both grades. If your N52 or N48 application also runs hot — a motor or an under-hood part — neither standard grade is safe, and you should step across to an SH grade such as N45SH or N48SH. For the broader picture, see N42 vs N52 and N35 vs N52, or the full grade chart.
When you send the inquiry, have these ready
• Available cavity dimensions (is the magnet size fixed, or can it grow?)
• Target pull force or required surface field
• Air gap — any plastic, plating, or stand-off between magnet and steel
• Order quantity and schedule (decides whether N48's yield advantage matters)
Space-constrained or cost-constrained?
Tell us your cavity size, force target, and air gap. We will show you whether N48 sized up beats N52 — with numbers, then a quote.
Get a quote on N48 or N52How to choose for your procurement spec
The decision in one line
If space is fixed and you need maximum field, pay for N52. If you have room to size up or you are buying at volume, N48 usually delivers the same force at lower cost and better yield.
Fixed cavity, weight-critical, or the part must be as small as physically possible. The top standard grade, worth its premium only when space is the constraint.
You can add a little thickness, you are buying in volume, or the geometry is large or complex. Lower cost per unit of force, more stable supply, better yield.
As always, the grade stamp is only as good as the supplier behind it. A weak N52 can test closer to N48, erasing the premium you paid. Ask for the measured BHmax and the demagnetization curve on your actual part, not a generic datasheet. Mainrich holds a 99% consistency rate across mass production, so the grade you order is the grade you receive — verified, not assumed.
