Ι Overview of Affordable Neodymium Magnets

Neodymium magnets, commonly referred to as NdFeB magnets, rank among the most powerful permanent magnets on the market today. Celebrated for their outstanding magnetic strength in relation to their compact size and light weight, they form the foundation of numerous applications, spanning electric vehicle motors, wind turbines, and routine household items.

That said, not every project demands high-coercivity options or the popular N52 grade, renowned for its superior magnetic output. In fact, even the widely favored N35 grade can prove excessive for many practical situations. This is where affordable Neodymium magnets—such as the N25, N28, N30, and N33 grades—step in, delivering a budget-friendly solution for tasks that don’t require peak magnetic power and involve modest performance needs.

These affordable Neodymium magnets provide sufficient magnetic strength for intended uses while keeping costs down. They shine in budget-conscious scenarios like toys, relatively low-demand fixes such as magnetic door catches, and packaging closures like bag buckles and packaging boxes.

Overview of Affordable Neodymium Magnets-updated

Grade of Neodymium Magnets

Neodymium magnets are graded using a system that begins with the letter N, followed by a numerical value and sometimes one or more suffix letters. The “N” signifies Neodymium, the primary component in the alloy.

The numerical part represents the magnet’s maximum energy product, known as (BH)max, expressed in Mega-Gauss Oersteds (MGOe) in the CGS measurement system. The suffix letters, if present, indicate the magnet’s intrinsic coercivity level and its maximum operating temperature.

Magnets designated with M (medium), H (high), SH (super high), UH (ultra high), EH (extreme high), or AH (advanced high) possess intrinsic coercivity values above 14, 17, 20, 25, 30, and 35 kOe, respectively, supporting maximum operating temperatures of 100, 120, 150, 180, 200, and 220°C.

Certain common grades, such as N35 and N52, omit any suffix letter; these variants feature an intrinsic coercivity starting at 12 kOe and are rated for operating temperatures up to 80°C. Furthermore, grain boundary diffused neodymium magnets incorporate a “G” prefix in their grade to denote their specialized production technique.

Affordable Neodymium Magnets-Grade of Neodymium Magnets

The Chinese national standard for sintered Neodymium magnets, GB/T 13560-2017, which took effect in May 2018, does not specify magnetic property indicators for affordable neodymium magnet grades or dual-high magnet grades that combine high maximum energy product and high intrinsic coercivity.

For dual-high magnet grades, refer to the Chinese national standard GB/T 42160-2022 for grain boundary diffused Neodymium magnets.

For affordable Neodymium magnets, N33, N30, N28, and N25 are typically classified under the N-series grades, with their remanence and maximum magnetic energy product indicators aligning with similar performance levels in high-coercivity grades.

Max. Energy Products (BH)max		Max. Working Temperature ℃
(MGOe)	(kJ/³)	<80↓	80	100	120	150	180	200	220
54	430		N54
52	414		N52	N52M
50	398		N50	N50M	N50H
48	382		N48	N48M	N48H	N48SH
45	358		N45	N45M	N45H	N45SH	N45UH
42	334		N42	N42M	N42H	N42SH	N42UH	N42EH
40	318		N40	N40M	N40H	N40SH	N40UH	N40EH
38	302		N38	N38M	N38H	N38SH	N38UH	N38EH	N38AH
35	278		N35	N35M	N35H	N35SH	N35UH	N35EH	N35AH
33	263	N33			N33H	N33SH	N33UH	N33EH	N33AH
30	239	N30					N30UH	N30EH	N30AH
28	223	N28						N28EH	N28AH
25	199	N25
		<12↓	12	14	17	20	25	30	33/35	(kOe)	Intrinsic coercivity Hcj
		<955↓	955	1114	1353	1592	1990	2388	2628/2786	(kA/m)	Intrinsic coercivity Hcj

It is important to note that the intrinsic coercivity of N33, N30, N28, and N25 magnets in actual large-scale production often falls short of the requirements for N-series grades. As the incorporation of high-abundance rare earth elements like Lanthanum and Cerium—used to substitute for Praseodymium and Neodymium—increases, the intrinsic coercivity drops sharply from N33 to N25.

Although the Chinese national standard GB/T 40790-2021 for Cerium-based magnets defines L and D levels for intrinsic coercivity—with the L level requiring ≥8.0/6.0 kOe (640/480 kA/m) and the D level ≥10.0 kOe (800 kA/m)—this standard has seen limited adoption, and many in the industry remain unaware of it. Furthermore, while the standard includes N33, N30, N28, and N25 in the N-series with intrinsic coercivity ≥12.0 kOe (960 kA/m), magnets meeting these thresholds lack competitive cost advantages and do not represent the real-world performance of widely used products.

Debunking the "Low Quality" Label: The Reality of N25, N28, N30, N33 Grades

The grades N25, N28, N30, and N33 are often labeled as “low quality” or even “garbage” in the Neodymium magnet community, especially in online forums like Reddit, industry blogs, or during competitive supplier bids for customers. This view arises from their reduced magnetic performance relative to standard grades like N35 or N52, though it’s frequently an oversimplification.

Some suppliers, driven by profit motives or competitive edges, engage in misleading labeling—such as substituting N28 for N35 after evaluating the application—often without informing the customer. Moreover, certain suppliers deliberately relax quality control for these grades or targeted markets to cut costs to the minimum. Over time, these practices have collectively damaged the reputation of these grades. In reality, whether they qualify as “low quality” hinges on customer awareness. Through transparent communication and a thorough grasp of the usage context, these grades can legitimately serve as affordable Neodymium magnets. Such affordable Neodymium magnets can function as gap magnets, bridging the performance gaps between various magnet types.