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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

bulk discounts:

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Technical details - 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 simulation of the magnet - report

The following data are the outcome of a physical calculation. Results are based on models for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs distance) - power drop
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 LBS
37120.0 g / 364.1 N
crushing
1 mm 3234 Gs
323.4 mT
33.50 kg / 73.86 LBS
33501.5 g / 328.6 N
crushing
2 mm 3052 Gs
305.2 mT
29.85 kg / 65.80 LBS
29847.1 g / 292.8 N
crushing
3 mm 2866 Gs
286.6 mT
26.32 kg / 58.02 LBS
26317.3 g / 258.2 N
crushing
5 mm 2496 Gs
249.6 mT
19.97 kg / 44.02 LBS
19965.4 g / 195.9 N
crushing
10 mm 1702 Gs
170.2 mT
9.28 kg / 20.45 LBS
9278.2 g / 91.0 N
strong
15 mm 1151 Gs
115.1 mT
4.25 kg / 9.36 LBS
4246.0 g / 41.7 N
strong
20 mm 792 Gs
79.2 mT
2.01 kg / 4.44 LBS
2012.1 g / 19.7 N
strong
30 mm 404 Gs
40.4 mT
0.52 kg / 1.15 LBS
523.0 g / 5.1 N
safe
50 mm 137 Gs
13.7 mT
0.06 kg / 0.13 LBS
60.1 g / 0.6 N
safe

Table 2: Shear hold (vertical surface)
MPL 50x25x12 / N38

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

Table 3: Wall mounting (shearing) - 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 LBS
11136.0 g / 109.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
7.42 kg / 16.37 LBS
7424.0 g / 72.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.71 kg / 8.18 LBS
3712.0 g / 36.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
18.56 kg / 40.92 LBS
18560.0 g / 182.1 N

Table 4: Steel thickness (substrate influence) - 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 LBS
1856.0 g / 18.2 N
1 mm
13%
4.64 kg / 10.23 LBS
4640.0 g / 45.5 N
2 mm
25%
9.28 kg / 20.46 LBS
9280.0 g / 91.0 N
3 mm
38%
13.92 kg / 30.69 LBS
13920.0 g / 136.6 N
5 mm
63%
23.20 kg / 51.15 LBS
23200.0 g / 227.6 N
10 mm
100%
37.12 kg / 81.84 LBS
37120.0 g / 364.1 N
11 mm
100%
37.12 kg / 81.84 LBS
37120.0 g / 364.1 N
12 mm
100%
37.12 kg / 81.84 LBS
37120.0 g / 364.1 N

Table 5: Thermal stability (material behavior) - resistance threshold
MPL 50x25x12 / N38

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

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 50x25x12 / N38

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

Table 7: Protective zones (implants) - precautionary measures
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
Phone / Smartphone 40 Gs (4.0 mT) 8.5 cm
Remote 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: Impact energy (kinetic energy) - warning
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 (Pc)
MPL 50x25x12 / N38

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

Table 11: Underwater work (magnet fishing)
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

*Warning: On a vertical wall, the magnet retains merely a fraction of its nominal pull.

2. Plate thickness effect

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

3. Thermal stability

*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
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%
Environmental data
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
Pulling force

Magnetic Field

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Model MPL 50x25x12 / 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 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 sliding 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. Watch your fingers! Magnets with a force of 37.12 kg can pinch very hard and cause hematomas. 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 filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 37.12 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 50x25x12 / N38, we recommend utilizing 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. 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: 50 mm (length), 25 mm (width), and 12 mm (thickness). It is a magnetic block with dimensions 50x25x12 mm and a self-weight of 112.5 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of Nd2Fe14B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their power remains stable, and after approximately ten years it drops only by ~1% (theoretically),
  • Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
  • In other words, due to the smooth layer of silver, the element is aesthetically pleasing,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of detailed shaping as well as adapting to individual needs,
  • Fundamental importance in future technologies – they serve a role in computer drives, electric motors, advanced medical instruments, also industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complicated shapes in magnets, we recommend using casing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

The declared magnet strength concerns the peak performance, measured under laboratory conditions, specifically:
  • on a base made of structural steel, optimally conducting the magnetic flux
  • with a thickness of at least 10 mm
  • with an ideally smooth contact surface
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction vertical to the mounting surface
  • at standard ambient temperature

What influences lifting capacity in practice

In real-world applications, the actual holding force results from several key aspects, listed from crucial:
  • Air gap (between the magnet and the metal), since even a very small distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Load vector – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Material type – the best choice is high-permeability steel. Hardened steels may attract less.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Warnings
Nickel allergy

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, immediately stop working with magnets and wear gloves.

Do not drill into magnets

Dust created during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Hand protection

Pinching hazard: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Immense force

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Danger to pacemakers

Warning for patients: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or request help to work with the magnets.

Eye protection

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Operating temperature

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

Cards and drives

Intense magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Swallowing risk

Strictly store magnets away from children. Choking hazard is significant, and the effects of magnets clamping inside the body are very dangerous.

Phone sensors

GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Danger! More info about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98