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MPL 30x15x2 / N38 - lamellar magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

lamellar magnet

Catalog no 020140

GTIN/EAN: 5906301811466

5.00

length

30 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

6.75 g

Magnetization Direction

↑ axial

Load capacity

2.11 kg / 20.74 N

Magnetic Induction

115.11 mT / 1151 Gs

Coating

[NiCuNi] Nickel

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Technical of the product - MPL 30x15x2 / N38 - lamellar magnet

Specification / characteristics - MPL 30x15x2 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020140
GTIN/EAN	5906301811466
Production/Distribution	Dhit sp. z o.o. ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin	Poland / China / Germany
Customs code	85059029
length	30 mm [±0,1 mm]
Width	15 mm [±0,1 mm]
Height	2 mm [±0,1 mm]
Weight	6.75 g
Magnetization Direction	↑ axial
Load capacity ~ ?	2.11 kg / 20.74 N
Magnetic Induction ~ ?	115.11 mT / 1151 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x15x2 / N38 - lamellar magnet

properties	values	units
remenance Br [min. - max.] ?	12.2-12.6	kGs
remenance Br [min. - max.] ?	1220-1260	mT
coercivity bHc ?	10.8-11.5	kOe
coercivity bHc ?	860-915	kA/m
actual internal force iHc	≥ 12	kOe
actual internal force iHc	≥ 955	kA/m
energy density [min. - max.] ?	36-38	BH max MGOe
energy density [min. - max.] ?	287-303	BH max KJ/m
max. temperature ?	≤ 80	°C

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

properties	values	units
Vickers hardness	≥550	Hv
Density	≥7.4	g/cm³
Curie Temperature TC	312 - 380	°C
Curie Temperature TF	593 - 716	°F
Specific resistance	150	μΩ⋅cm
Bending strength	250	MPa
Compressive strength	1000~1100	MPa
Thermal expansion parallel (∥) to orientation (M)	(3-4) x 10^-6	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10^-6	°C^-1
Young's modulus	1.7 x 10⁴	kg/mm²

Engineering analysis of the magnet - report

Presented values are the direct effect of a physical calculation. Values were calculated on algorithms for the class Nd₂Fe₁₄B. Actual conditions may deviate from the simulation results. Please consider these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - interaction chart
MPL 30x15x2 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	1151 Gs 115.1 mT	2.11 kg / 2110.0 g 20.7 N	medium risk
1 mm	1098 Gs 109.8 mT	1.92 kg / 1920.5 g 18.8 N	weak grip
2 mm	1019 Gs 101.9 mT	1.65 kg / 1654.9 g 16.2 N	weak grip
3 mm	926 Gs 92.6 mT	1.37 kg / 1365.9 g 13.4 N	weak grip
5 mm	733 Gs 73.3 mT	0.86 kg / 855.2 g 8.4 N	weak grip
10 mm	379 Gs 37.9 mT	0.23 kg / 228.8 g 2.2 N	weak grip
15 mm	203 Gs 20.3 mT	0.07 kg / 65.6 g 0.6 N	weak grip
20 mm	116 Gs 11.6 mT	0.02 kg / 21.6 g 0.2 N	weak grip
30 mm	46 Gs 4.6 mT	0.00 kg / 3.4 g 0.0 N	weak grip
50 mm	12 Gs 1.2 mT	0.00 kg / 0.2 g 0.0 N	weak grip

Pulling power decreases drastically with every subsequent millimeter of gap. Keep in mind that even a microscopic distance (e.g., contamination, paint, dust) noticeably diminishes the holding power. Magnetic products operate most effectively in perfect adhesion; distance drastically cuts the force. Notice how quickly the load capacity plummet, when the magnet does not touch directly to the steel surface. When designing the arrangement, discard unnecessary gaps.

Table 2: Sliding force (vertical surface)
MPL 30x15x2 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.42 kg / 422.0 g 4.1 N
1 mm	Stal (~0.2)	0.38 kg / 384.0 g 3.8 N
2 mm	Stal (~0.2)	0.33 kg / 330.0 g 3.2 N
3 mm	Stal (~0.2)	0.27 kg / 274.0 g 2.7 N
5 mm	Stal (~0.2)	0.17 kg / 172.0 g 1.7 N
10 mm	Stal (~0.2)	0.05 kg / 46.0 g 0.5 N
15 mm	Stal (~0.2)	0.01 kg / 14.0 g 0.1 N
20 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The table below indicates the estimated holding capacity needed to cause the sliding of the magnet down against a vertical steel plate (assuming typical friction). This value is a function of the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MPL 30x15x2 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.63 kg / 633.0 g 6.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.42 kg / 422.0 g 4.1 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.21 kg / 211.0 g 2.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.06 kg / 1055.0 g 10.3 N

When mounting a element on a vertical surface (e.g., a board), it you can count on barely about 20%-30% of its maximum pull force. Gravity and a weak degree of grip influence the fact that products slide down faster than they pull off. Planning a hanger? Consider that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a noticeably lighter weight. Application of an anti-slip layer can drastically improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 30x15x2 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.21 kg / 211.0 g 2.1 N
1 mm	25%	0.53 kg / 527.5 g 5.2 N
2 mm	50%	1.06 kg / 1055.0 g 10.3 N
5 mm	100%	2.11 kg / 2110.0 g 20.7 N
10 mm	100%	2.11 kg / 2110.0 g 20.7 N

A thin metal plate is incapable of focus the entire magnetic field, which squanders power of the holder. Should you attach a powerful product to a thin surface, the field will pass right through and the holding will be smaller. To squeeze the maximum of this magnet's potential, you require a sufficiently solid element of metal. The saturation effect causes that on sheet metal structures (e.g., car bodies), the holder holds weaker. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 30x15x2 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	2.11 kg / 2110.0 g 20.7 N	OK
40 °C	-2.2%	2.06 kg / 2063.6 g 20.2 N	OK
60 °C	-4.4%	2.02 kg / 2017.2 g 19.8 N
80 °C	-6.6%	1.97 kg / 1970.7 g 19.3 N
100 °C	-28.8%	1.50 kg / 1502.3 g 14.7 N

Ordinary NdFeB products change their properties power after exceeding the maximum temperature. Watch out for overheating – heat can permanently damage this magnet. As the temperature rises, the magnet's capacity briefly decreases. Avoid using this magnet close to ovens exceeding its working range. Too high temperature will cause irreversible degradation of magnetic properties.

*Technical advisory: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) are more susceptible to demagnetization under lower heat stress than long magnets. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MPL 30x15x2 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	3.67 kg / 3675 g 36.1 N 2 169 Gs	N/A
1 mm	3.53 kg / 3533 g 34.7 N 2 257 Gs	3.18 kg / 3180 g 31.2 N ~0 Gs
2 mm	3.34 kg / 3345 g 32.8 N 2 196 Gs	3.01 kg / 3010 g 29.5 N ~0 Gs
3 mm	3.12 kg / 3124 g 30.6 N 2 122 Gs	2.81 kg / 2812 g 27.6 N ~0 Gs
5 mm	2.63 kg / 2631 g 25.8 N 1 948 Gs	2.37 kg / 2368 g 23.2 N ~0 Gs
10 mm	1.49 kg / 1490 g 14.6 N 1 465 Gs	1.34 kg / 1341 g 13.2 N ~0 Gs
20 mm	0.40 kg / 398 g 3.9 N 758 Gs	0.36 kg / 359 g 3.5 N ~0 Gs
50 mm	0.01 kg / 14 g 0.1 N 142 Gs	0.01 kg / 13 g 0.1 N ~0 Gs

Two magnetic products interact from a significantly greater distance than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a larger range of operation. Planning to create a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the impact force is huge. The levitation is a bit weaker than the connection force, but still significant.
*Field value for N-N configuration is approximately ~0 Gs at the midpoint between the magnets (due to field cancellation).

Table 7: Safety (HSE) (implants) - warnings
MPL 30x15x2 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	7.0 cm
Hearing aid	10 Gs (1.0 mT)	5.5 cm
Timepiece	20 Gs (2.0 mT)	4.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	3.5 cm
Car key	50 Gs (5.0 mT)	3.0 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

A strong magnetic field is a real danger to electronics and pacemakers. These neodymiums generate a field that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MPL 30x15x2 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	19.00 km/h (5.28 m/s)	0.09 J
30 mm	30.91 km/h (8.59 m/s)	0.25 J
50 mm	39.87 km/h (11.08 m/s)	0.41 J
100 mm	56.39 km/h (15.66 m/s)	0.83 J

NdFeB products are delicate – a violent impact against metal causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or injury to skin. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 30x15x2 / N38

Technical parameter	Value / Description
Coating type	[NiCuNi] Nickel
Layer structure	Nickel - Copper - Nickel
Layer thickness	10-20 µm
Salt spray test (SST) ?	24 h
Recommended environment	Indoors only (dry)

The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MPL 30x15x2 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	6 236 Mx	62.4 µWb
P_c Coefficient	0.13	Low (Flat)

Total magnetic flux passing through the magnet pole. Key data when building generators as well as sensors. P_c value determines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 30x15x2 / N38

Environment	Effective steel pull	Effect
Air (land)	2.11 kg	Standard
Water (riverbed)	2.42 kg (+0.31 kg Buoyancy gain)	+14.5%

Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Shear force

*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Temperature resistance

*For N38 material, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.13

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The P_c (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher P_c value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical specification and ecology

Elemental analysis

iron (Fe)	64% – 68%
neodymium (Nd)	29% – 32%
boron (B)	1.1% – 1.2%
dysprosium (Dy)	0.5% – 2.0%
coating (Ni-Cu-Ni)	< 0.05%

Ecology and recycling (GPSR)

recyclability (EoL)	100%
recycled raw materials	~10% (pre-cons)
carbon footprint	low / zredukowany
waste code (EWC)	16 02 16

Safety card (GPSR)

responsible entity

Dhit sp. z o.o.

ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki

tel: +48 22 499 98 98 | e-mail: bok@dhit.pl

batch number/type

id: 020140-2025

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Model MPL 30x15x2 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 20.74 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.

Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 30x15x2 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

Plate magnets MPL 30x15x2 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 2.11 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.

For mounting flat magnets MPL 30x15x2 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).

Standardly, the MPL 30x15x2 / N38 model is magnetized through the thickness (dimension 2 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.

The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 15 mm (width), and 2 mm (thickness). It is a magnetic block with dimensions 30x15x2 mm and a self-weight of 6.75 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:

They retain attractive force for nearly 10 years – the loss is just ~1% (based on simulations),
Neodymium magnets prove to be highly resistant to magnetic field loss caused by magnetic disturbances,
A magnet with a smooth nickel surface has better aesthetics,
Magnetic induction on the working layer of the magnet is maximum,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
Due to the possibility of precise molding and adaptation to unique needs, magnetic components can be created in a variety of geometric configurations, which amplifies use scope,
Wide application in advanced technology sectors – they find application in mass storage devices, electric motors, precision medical tools, also complex engineering applications.
Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of NdFeB magnets:

Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
Limited possibility of creating threads in the magnet and complicated shapes - recommended is cover - mounting mechanism.
Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

The lifting capacity listed is a theoretical maximum value executed under the following configuration:

on a block made of mild steel, effectively closing the magnetic flux
with a cross-section no less than 10 mm
with an ground contact surface
under conditions of gap-free contact (metal-to-metal)
for force applied at a right angle (pull-off, not shear)
at standard ambient temperature

What influences lifting capacity in practice

In real-world applications, the actual holding force depends on several key aspects, presented from the most important:

Distance – existence of foreign body (rust, dirt, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
Steel thickness – too thin plate does not accept the full field, causing part of the flux to be escaped to the other side.
Plate material – low-carbon steel attracts best. Alloy steels lower magnetic properties and lifting capacity.
Surface finish – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was measured with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets

Keep away from electronics

GPS units and smartphones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Electronic hazard

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, hearing aids, timepieces).

Medical implants

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Allergic reactions

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, avoid touching magnets with bare hands and select coated magnets.

Operating temperature

Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. This process is irreversible.

Risk of cracking

Neodymium magnets are sintered ceramics, meaning they are very brittle. Collision of two magnets leads to them shattering into small pieces.

Hand protection

Big blocks can smash fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.

Mechanical processing

Combustion risk: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Handling rules

Be careful. Neodymium magnets attract from a long distance and connect with massive power, often quicker than you can react.

Choking Hazard

Only for adults. Small elements can be swallowed, causing serious injuries. Store out of reach of children and animals.

Danger! Details about hazards in the article: Magnet Safety Guide.

MPL 30x15x2 / N38 - lamellar magnet

Technical of the product - MPL 30x15x2 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering analysis of the magnet - report

Table 1: Static force (force vs gap) - interaction chart MPL 30x15x2 / N38

Table 2: Sliding force (vertical surface) MPL 30x15x2 / N38

Table 3: Wall mounting (shearing) - vertical pull MPL 30x15x2 / N38

Table 4: Material efficiency (saturation) - sheet metal selection MPL 30x15x2 / N38

Table 5: Thermal resistance (material behavior) - thermal limit MPL 30x15x2 / N38

Table 6: Two magnets (repulsion) - field range MPL 30x15x2 / N38

Table 7: Safety (HSE) (implants) - warnings MPL 30x15x2 / N38

Table 8: Impact energy (kinetic energy) - collision effects MPL 30x15x2 / N38

Table 9: Anti-corrosion coating durability MPL 30x15x2 / N38

Table 10: Construction data (Flux) MPL 30x15x2 / N38

Table 11: Underwater work (magnet fishing) MPL 30x15x2 / N38

1. Shear force

2. Efficiency vs thickness

3. Temperature resistance

4. Demagnetization curve and operating point (B-H)

Elemental analysis

Ecology and recycling (GPSR)

Force (pull)

Magnetic Field

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Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Disadvantages

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

What influences lifting capacity in practice

Safety rules for work with NdFeB magnets

Keep away from electronics

Electronic hazard

Medical implants

Allergic reactions

Operating temperature

Risk of cracking

Hand protection

Mechanical processing

Handling rules

Choking Hazard

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - interaction chart
MPL 30x15x2 / N38

Table 2: Sliding force (vertical surface)
MPL 30x15x2 / N38

Table 3: Wall mounting (shearing) - vertical pull
MPL 30x15x2 / N38

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 30x15x2 / N38

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 30x15x2 / N38

Table 6: Two magnets (repulsion) - field range
MPL 30x15x2 / N38

Table 7: Safety (HSE) (implants) - warnings
MPL 30x15x2 / N38

Table 8: Impact energy (kinetic energy) - collision effects
MPL 30x15x2 / N38

Table 9: Anti-corrosion coating durability
MPL 30x15x2 / N38

Table 10: Construction data (Flux)
MPL 30x15x2 / N38

Table 11: Underwater work (magnet fishing)
MPL 30x15x2 / N38

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.