Working temperature is the grade question buyers ask most, and the shared grade maximum working temperature table is the published answer on this site. This guide explains how to read that table, what it decides and what it does not decide, and how to state an operating temperature in an inquiry so the grade discussion can be confirmed rather than guessed. The table is shared across the company's shape pages, and it is reproduced here as a shared table, not as a measurement for any single shape.
Reading the table row by row
The table lists six series with their maximum working temperatures: N35–N52 at 80°C (176°F); 33M–48M at 100°C (212°F); 33H–48H at 120°C (248°F); 30SH–45SH at 150°C (302°F); 30UH–40UH at 180°C (356°F); and 28EH–38EH at 200°C (392°F). Each row answers one question: the listed maximum working temperature for that series. The table does not rank grades by strength, does not promise performance at the listed temperature, and does not select a grade for an application. A buyer who reads a row as a guarantee has read more into the table than it contains, and a buyer who reads it as a discussion starting point has read it correctly.
The suffix letters — M, H, SH, UH, EH — mark the series, and the numbers before them mark positions within a series, but this site does not expand those letters and numbers into performance claims beyond the temperature row. Grade names must not be treated as evidence about anything except the row they sit in. In particular, a grade name must not be used to infer an operating range, a resistance figure or a suitability verdict for a particular shape, because none of those inferences is published. The inquiry should therefore name the series and the operating temperature together, so the discussion is anchored to a figure rather than to a name.
Stating the operating temperature honestly
The operating temperature is the temperature the magnet will actually see in service, including heat from neighbouring parts, from the assembly itself, and from the environment over time. It is not the room temperature, not the temperature on a datasheet for a different part, and not a round number chosen for convenience. Stating it honestly matters because the series discussion follows from it: a magnet whose real operating temperature sits above the listed maximum for its series needs a different series discussion, and a magnet whose temperature sits well below it can be discussed with a margin that should still be stated. If the operating temperature is unknown, say so in the inquiry and ask what information is needed to discuss it, rather than letting a series be chosen by default.
Temperature also interacts with the other specification items, and the inquiry should carry them together. A grade series discussed without a shape is incomplete, because the table is shared and not shape-specific; a series discussed without a magnetization direction is incomplete, because the direction belongs to the shape; and a series discussed without a fixing description is incomplete where the fixing affects heat transfer or mechanical stress. The four-item inquiry — shape, dimensions, grade series, direction — plus the operating temperature is the minimum that lets a temperature discussion be confirmed.
What the table does not decide
The table does not decide whether a magnet will work in a particular application, because working in an application depends on geometry, direction, fixing, environment and temperature together, and the table covers only the last of those in series terms. It does not decide a coating, because coating type names were not transcribed from the company's illustration and no coating type is named on this site. It does not decide a warranty, because warranty terms are unavailable on the published pages. And it does not replace the demagnetization curve charts on the company's sintered page, whose values were not transcribed and are therefore not quoted here. A buyer who needs curve data for a specific series should ask for the chart for that series explicitly.
Above all, the table does not license extrapolating a grade from one shape to another. Because the table is shared across shape pages, it is tempting to treat it as a property of the material in general and then apply it to any geometry without further thought. The correct reading is narrower: the table is a shared reference that must be combined with the shape's own range and direction list for the part under discussion. A temperature discussion that never names a shape has not yet become a specification, and the review will need to ask for the shape before it can confirm anything.
Questions to send with a temperature inquiry
A specification that can be answered names four items together: the shape family, dimensions inside that family's published range, the grade temperature series, and the magnetization direction exactly as listed for that shape. Add the operating temperature and the fixing method where they affect the choice, and ask coating and warranty as open questions. Please confirm minimum order quantity and lead time before ordering. Warranty terms are unavailable on the published pages — please confirm warranty terms before ordering. Certificates are available upon request; no certificate number or issuing body is published here.
An inquiry that names only a grade, or only a size, will be answered with questions rather than a confirmation, because neither item alone is a complete specification. The extra sentence that states the direction in plain words, or that gives the mating dimension for a fixing, is often the sentence that prevents a second round of correspondence, and it costs nothing to include at the start.
Frequently asked questions
Which grade series should I discuss for neodymium magnet working temperature guide?
Discuss the grade series against the shared grade maximum working temperature table, using the temperature the magnet will actually see in service, including heat from neighbouring parts. The series run from N35–N52 at 80°C through the M series at 100°C, the H series at 120°C, the SH series at 150°C and the UH series at 180°C to the EH series at 200°C. State the operating temperature as a figure in the inquiry, because a grade name without its temperature row has not been specified for a warm environment, and the review needs the temperature to confirm the series discussion rather than infer it from a name alone.
How exactly should I state the magnetization direction?
Copy the direction exactly as listed for the shape named in the inquiry, and do not substitute a synonym that feels equivalent, because the same word can describe a different arrangement on a different shape. Where a drawing uses a different convention, add a plain-words description of the pole positions alongside the listed term, so the review can reconcile the two without guessing. A direction that is assumed rather than confirmed is a common source of a magnet that is dimensionally correct and magnetically wrong for its fixing, so the extra sentence describing the poles is worth writing even in a short inquiry.
What should I ask about coating, warranty and certificates?
Please confirm coating requirements before ordering, because coating type names were not transcribed from the company illustration and no coating type is named on this site; state the operating environment with the coating question so the answer can be specific. Warranty terms are unavailable on the published pages, so please confirm warranty terms before ordering rather than assuming a term. Certificates are available upon request: name the certificate required and its purpose in the inquiry, because no certificate number, issuing body, scope or validity period is published here, and a named request can be matched to the order it belongs to.
What if my size or combination is not in the published range?
Ask whether it can be made, and send the dimension as written rather than rounding it into the published range. A value outside a shape range, a direction not listed for that shape, or a combination of features from two shapes should be raised as an explicit question, with a dimensioned sketch where the geometry is curved, holed or otherwise not captured by a single size figure. Please confirm minimum order quantity and lead time before ordering. A question asked before ordering costs one message; a forced fit into the nearest published table can cost the whole part, because a magnet that matches its order and fails its fixing is worse than an extra round of questions.