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MPL 50x25x12 / N38 - lamellar magnet

lamellar magnet

Catalog no 020343

GTIN/EAN: 5906301811855

5.00

length

50 mm [±0,1 mm]

Width

25 mm [±0,1 mm]

Height

12 mm [±0,1 mm]

Weight

112.5 g

Magnetization Direction

↑ axial

Load capacity

37.12 kg / 364.18 N

Magnetic Induction

340.43 mT / 3404 Gs

Coating

[NiCuNi] Nickel

45.51 with VAT / pcs + price for transport

37.00 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 50x25x12 / N38 - lamellar magnet

Specification / characteristics - MPL 50x25x12 / N38 - lamellar magnet

properties
properties values
Cat. no. 020343
GTIN/EAN 5906301811855
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 50 mm [±0,1 mm]
Width 25 mm [±0,1 mm]
Height 12 mm [±0,1 mm]
Weight 112.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 37.12 kg / 364.18 N
Magnetic Induction ~ ? 340.43 mT / 3404 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x25x12 / 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

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 product - technical parameters

Presented data are the direct effect of a mathematical analysis. Results are based on algorithms for the class Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Treat these calculations as a reference point when designing systems.

Table 1: Static pull force (pull vs gap) - interaction chart
MPL 50x25x12 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3404 Gs
340.4 mT
37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
crushing
1 mm 3234 Gs
323.4 mT
33.50 kg / 73.86 pounds
33501.5 g / 328.6 N
crushing
2 mm 3052 Gs
305.2 mT
29.85 kg / 65.80 pounds
29847.1 g / 292.8 N
crushing
3 mm 2866 Gs
286.6 mT
26.32 kg / 58.02 pounds
26317.3 g / 258.2 N
crushing
5 mm 2496 Gs
249.6 mT
19.97 kg / 44.02 pounds
19965.4 g / 195.9 N
crushing
10 mm 1702 Gs
170.2 mT
9.28 kg / 20.45 pounds
9278.2 g / 91.0 N
strong
15 mm 1151 Gs
115.1 mT
4.25 kg / 9.36 pounds
4246.0 g / 41.7 N
strong
20 mm 792 Gs
79.2 mT
2.01 kg / 4.44 pounds
2012.1 g / 19.7 N
strong
30 mm 404 Gs
40.4 mT
0.52 kg / 1.15 pounds
523.0 g / 5.1 N
safe
50 mm 137 Gs
13.7 mT
0.06 kg / 0.13 pounds
60.1 g / 0.6 N
safe

Table 2: Slippage capacity (wall)
MPL 50x25x12 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 7.42 kg / 16.37 pounds
7424.0 g / 72.8 N
1 mm Stal (~0.2) 6.70 kg / 14.77 pounds
6700.0 g / 65.7 N
2 mm Stal (~0.2) 5.97 kg / 13.16 pounds
5970.0 g / 58.6 N
3 mm Stal (~0.2) 5.26 kg / 11.61 pounds
5264.0 g / 51.6 N
5 mm Stal (~0.2) 3.99 kg / 8.81 pounds
3994.0 g / 39.2 N
10 mm Stal (~0.2) 1.86 kg / 4.09 pounds
1856.0 g / 18.2 N
15 mm Stal (~0.2) 0.85 kg / 1.87 pounds
850.0 g / 8.3 N
20 mm Stal (~0.2) 0.40 kg / 0.89 pounds
402.0 g / 3.9 N
30 mm Stal (~0.2) 0.10 kg / 0.23 pounds
104.0 g / 1.0 N
50 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x25x12 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
11.14 kg / 24.55 pounds
11136.0 g / 109.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
7.42 kg / 16.37 pounds
7424.0 g / 72.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.71 kg / 8.18 pounds
3712.0 g / 36.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
18.56 kg / 40.92 pounds
18560.0 g / 182.1 N

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 50x25x12 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.86 kg / 4.09 pounds
1856.0 g / 18.2 N
1 mm
13%
4.64 kg / 10.23 pounds
4640.0 g / 45.5 N
2 mm
25%
9.28 kg / 20.46 pounds
9280.0 g / 91.0 N
3 mm
38%
13.92 kg / 30.69 pounds
13920.0 g / 136.6 N
5 mm
63%
23.20 kg / 51.15 pounds
23200.0 g / 227.6 N
10 mm
100%
37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
11 mm
100%
37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
12 mm
100%
37.12 kg / 81.84 pounds
37120.0 g / 364.1 N

Table 5: Thermal resistance (stability) - thermal limit
MPL 50x25x12 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
OK
40 °C -2.2% 36.30 kg / 80.04 pounds
36303.4 g / 356.1 N
OK
60 °C -4.4% 35.49 kg / 78.23 pounds
35486.7 g / 348.1 N
80 °C -6.6% 34.67 kg / 76.43 pounds
34670.1 g / 340.1 N
100 °C -28.8% 26.43 kg / 58.27 pounds
26429.4 g / 259.3 N

Table 6: Two magnets (attraction) - field collision
MPL 50x25x12 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 89.28 kg / 196.82 pounds
4 856 Gs
13.39 kg / 29.52 pounds
13392 g / 131.4 N
N/A
1 mm 84.99 kg / 187.37 pounds
6 642 Gs
12.75 kg / 28.11 pounds
12749 g / 125.1 N
76.49 kg / 168.63 pounds
~0 Gs
2 mm 80.57 kg / 177.64 pounds
6 467 Gs
12.09 kg / 26.65 pounds
12086 g / 118.6 N
72.52 kg / 159.87 pounds
~0 Gs
3 mm 76.16 kg / 167.90 pounds
6 287 Gs
11.42 kg / 25.19 pounds
11424 g / 112.1 N
68.54 kg / 151.11 pounds
~0 Gs
5 mm 67.49 kg / 148.78 pounds
5 919 Gs
10.12 kg / 22.32 pounds
10123 g / 99.3 N
60.74 kg / 133.91 pounds
~0 Gs
10 mm 48.02 kg / 105.86 pounds
4 992 Gs
7.20 kg / 15.88 pounds
7203 g / 70.7 N
43.22 kg / 95.28 pounds
~0 Gs
20 mm 22.32 kg / 49.20 pounds
3 403 Gs
3.35 kg / 7.38 pounds
3347 g / 32.8 N
20.08 kg / 44.28 pounds
~0 Gs
50 mm 2.41 kg / 5.31 pounds
1 118 Gs
0.36 kg / 0.80 pounds
361 g / 3.5 N
2.17 kg / 4.78 pounds
~0 Gs
60 mm 1.26 kg / 2.77 pounds
808 Gs
0.19 kg / 0.42 pounds
189 g / 1.9 N
1.13 kg / 2.50 pounds
~0 Gs
70 mm 0.69 kg / 1.52 pounds
598 Gs
0.10 kg / 0.23 pounds
103 g / 1.0 N
0.62 kg / 1.37 pounds
~0 Gs
80 mm 0.39 kg / 0.87 pounds
452 Gs
0.06 kg / 0.13 pounds
59 g / 0.6 N
0.35 kg / 0.78 pounds
~0 Gs
90 mm 0.23 kg / 0.52 pounds
349 Gs
0.04 kg / 0.08 pounds
35 g / 0.3 N
0.21 kg / 0.47 pounds
~0 Gs
100 mm 0.14 kg / 0.32 pounds
274 Gs
0.02 kg / 0.05 pounds
22 g / 0.2 N
0.13 kg / 0.29 pounds
~0 Gs

Table 7: Protective zones (electronics) - warnings
MPL 50x25x12 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 17.5 cm
Hearing aid 10 Gs (1.0 mT) 14.0 cm
Mechanical watch 20 Gs (2.0 mT) 11.0 cm
Mobile device 40 Gs (4.0 mT) 8.5 cm
Car key 50 Gs (5.0 mT) 8.0 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm

Table 8: Collisions (cracking risk) - collision effects
MPL 50x25x12 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.99 km/h
(5.83 m/s)
1.91 J
30 mm 32.01 km/h
(8.89 m/s)
4.45 J
50 mm 41.00 km/h
(11.39 m/s)
7.30 J
100 mm 57.93 km/h
(16.09 m/s)
14.57 J

Table 9: Anti-corrosion coating durability
MPL 50x25x12 / 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)

Table 10: Electrical data (Flux)
MPL 50x25x12 / N38

Parameter Value SI Unit / Description
Magnetic Flux 42 945 Mx 429.5 µWb
Pc Coefficient 0.40 Low (Flat)

Table 11: Submerged application
MPL 50x25x12 / N38

Environment Effective steel pull Effect
Air (land) 37.12 kg Standard
Water (riverbed) 42.50 kg
(+5.38 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

*Caution: On a vertical surface, the magnet retains only approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

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

3. Heat tolerance

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.40

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 Pc (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 Pc 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.

Engineering data and GPSR
Material specification
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%
Sustainability
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: 020343-2026
Measurement Calculator
Magnet pull force

Field Strength

Other deals

Model MPL 50x25x12 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 364.18 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is shifting the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 50x25x12 / 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 50x25x12 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 37.12 kg), they are ideal as closers 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 50x25x12 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 50x25x12 / N38 model is magnetized through the thickness (dimension 12 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (50x25 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 50x25x12 mm, which, at a weight of 112.5 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 37.12 kg (force ~364.18 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd2Fe14B magnets.

Benefits

Besides their immense strength, neodymium magnets offer the following advantages:
  • They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • A magnet with a shiny silver surface looks better,
  • Magnets have extremely high magnetic induction on the outer side,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
  • Considering the option of free shaping and customization to unique projects, neodymium magnets can be created in a broad palette of forms and dimensions, which expands the range of possible applications,
  • Significant place in advanced technology sectors – they are commonly used in hard drives, drive modules, diagnostic systems, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in miniature devices

Weaknesses

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and 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. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in realizing threads and complex forms in magnets, we propose using casing - magnetic mount.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Detachment force of the magnet in optimal conditionswhat affects it?

The specified lifting capacity represents the peak performance, obtained under laboratory conditions, namely:
  • on a base made of structural steel, effectively closing the magnetic field
  • with a cross-section of at least 10 mm
  • with an polished touching surface
  • under conditions of ideal adhesion (surface-to-surface)
  • for force acting at a right angle (in the magnet axis)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Please note that the working load may be lower influenced by the following factors, starting with the most relevant:
  • Air gap (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick sheet does not close the flux, causing part of the power to be lost to the other side.
  • Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
  • Surface condition – ground elements guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Additionally, even a slight gap between the magnet and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
Permanent damage

Monitor thermal conditions. Exposing the magnet to high heat will ruin its magnetic structure and pulling force.

Allergy Warning

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness occurs, cease handling magnets and wear gloves.

Data carriers

Device Safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Crushing force

Danger of trauma: The pulling power is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Choking Hazard

Strictly store magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are very dangerous.

Powerful field

Exercise caution. Rare earth magnets attract from a distance and connect with huge force, often quicker than you can react.

Medical implants

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Machining danger

Machining of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Phone sensors

Remember: rare earth magnets generate a field that confuses precision electronics. Maintain a separation from your phone, tablet, and GPS.

Fragile material

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Danger! Looking for details? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98