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MPL 50x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020166

GTIN/EAN: 5906301811725

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

150 g

Magnetization Direction

↑ axial

Load capacity

42.18 kg / 413.81 N

Magnetic Induction

478.99 mT / 4790 Gs

Coating

[NiCuNi] Nickel

47.32 with VAT / pcs + price for transport

38.47 ZŁ net + 23% VAT / pcs

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Lifting power along with structure of a neodymium magnet can be calculated with our our magnetic calculator.

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Technical parameters - MPL 50x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020166
GTIN/EAN 5906301811725
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 20 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 150 g
Magnetization Direction ↑ axial
Load capacity ~ ? 42.18 kg / 413.81 N
Magnetic Induction ~ ? 478.99 mT / 4790 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x20 / 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 modeling of the product - report

These values are the direct effect of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Real-world parameters may differ. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - power drop
MPL 50x20x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4789 Gs
478.9 mT
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
crushing
1 mm 4452 Gs
445.2 mT
36.46 kg / 80.38 pounds
36461.5 g / 357.7 N
crushing
2 mm 4114 Gs
411.4 mT
31.13 kg / 68.62 pounds
31126.5 g / 305.4 N
crushing
3 mm 3784 Gs
378.4 mT
26.34 kg / 58.06 pounds
26336.3 g / 258.4 N
crushing
5 mm 3173 Gs
317.3 mT
18.52 kg / 40.84 pounds
18523.4 g / 181.7 N
crushing
10 mm 2022 Gs
202.2 mT
7.52 kg / 16.59 pounds
7522.9 g / 73.8 N
warning
15 mm 1324 Gs
132.4 mT
3.22 kg / 7.10 pounds
3222.6 g / 31.6 N
warning
20 mm 899 Gs
89.9 mT
1.49 kg / 3.28 pounds
1487.5 g / 14.6 N
weak grip
30 mm 458 Gs
45.8 mT
0.39 kg / 0.85 pounds
385.8 g / 3.8 N
weak grip
50 mm 159 Gs
15.9 mT
0.05 kg / 0.10 pounds
46.4 g / 0.5 N
weak grip

Table 2: Slippage force (wall)
MPL 50x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 8.44 kg / 18.60 pounds
8436.0 g / 82.8 N
1 mm Stal (~0.2) 7.29 kg / 16.08 pounds
7292.0 g / 71.5 N
2 mm Stal (~0.2) 6.23 kg / 13.73 pounds
6226.0 g / 61.1 N
3 mm Stal (~0.2) 5.27 kg / 11.61 pounds
5268.0 g / 51.7 N
5 mm Stal (~0.2) 3.70 kg / 8.17 pounds
3704.0 g / 36.3 N
10 mm Stal (~0.2) 1.50 kg / 3.32 pounds
1504.0 g / 14.8 N
15 mm Stal (~0.2) 0.64 kg / 1.42 pounds
644.0 g / 6.3 N
20 mm Stal (~0.2) 0.30 kg / 0.66 pounds
298.0 g / 2.9 N
30 mm Stal (~0.2) 0.08 kg / 0.17 pounds
78.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x20x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
12.65 kg / 27.90 pounds
12654.0 g / 124.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.44 kg / 18.60 pounds
8436.0 g / 82.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.22 kg / 9.30 pounds
4218.0 g / 41.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
21.09 kg / 46.50 pounds
21090.0 g / 206.9 N

Table 4: Material efficiency (saturation) - power losses
MPL 50x20x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
2.11 kg / 4.65 pounds
2109.0 g / 20.7 N
1 mm
13%
5.27 kg / 11.62 pounds
5272.5 g / 51.7 N
2 mm
25%
10.55 kg / 23.25 pounds
10545.0 g / 103.4 N
3 mm
38%
15.82 kg / 34.87 pounds
15817.5 g / 155.2 N
5 mm
63%
26.36 kg / 58.12 pounds
26362.5 g / 258.6 N
10 mm
100%
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
11 mm
100%
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
12 mm
100%
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N

Table 5: Working in heat (material behavior) - resistance threshold
MPL 50x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
OK
40 °C -2.2% 41.25 kg / 90.95 pounds
41252.0 g / 404.7 N
OK
60 °C -4.4% 40.32 kg / 88.90 pounds
40324.1 g / 395.6 N
OK
80 °C -6.6% 39.40 kg / 86.85 pounds
39396.1 g / 386.5 N
100 °C -28.8% 30.03 kg / 66.21 pounds
30032.2 g / 294.6 N

Table 6: Two magnets (attraction) - field range
MPL 50x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 141.37 kg / 311.66 pounds
5 687 Gs
21.21 kg / 46.75 pounds
21205 g / 208.0 N
N/A
1 mm 131.73 kg / 290.41 pounds
9 245 Gs
19.76 kg / 43.56 pounds
19759 g / 193.8 N
118.55 kg / 261.37 pounds
~0 Gs
2 mm 122.20 kg / 269.41 pounds
8 904 Gs
18.33 kg / 40.41 pounds
18330 g / 179.8 N
109.98 kg / 242.47 pounds
~0 Gs
3 mm 113.05 kg / 249.23 pounds
8 564 Gs
16.96 kg / 37.38 pounds
16957 g / 166.4 N
101.74 kg / 224.31 pounds
~0 Gs
5 mm 96.05 kg / 211.76 pounds
7 894 Gs
14.41 kg / 31.76 pounds
14408 g / 141.3 N
86.45 kg / 190.58 pounds
~0 Gs
10 mm 62.08 kg / 136.87 pounds
6 347 Gs
9.31 kg / 20.53 pounds
9312 g / 91.4 N
55.87 kg / 123.18 pounds
~0 Gs
20 mm 25.21 kg / 55.59 pounds
4 045 Gs
3.78 kg / 8.34 pounds
3782 g / 37.1 N
22.69 kg / 50.03 pounds
~0 Gs
50 mm 2.46 kg / 5.43 pounds
1 264 Gs
0.37 kg / 0.81 pounds
370 g / 3.6 N
2.22 kg / 4.89 pounds
~0 Gs
60 mm 1.29 kg / 2.85 pounds
916 Gs
0.19 kg / 0.43 pounds
194 g / 1.9 N
1.16 kg / 2.57 pounds
~0 Gs
70 mm 0.71 kg / 1.58 pounds
681 Gs
0.11 kg / 0.24 pounds
107 g / 1.1 N
0.64 kg / 1.42 pounds
~0 Gs
80 mm 0.41 kg / 0.91 pounds
518 Gs
0.06 kg / 0.14 pounds
62 g / 0.6 N
0.37 kg / 0.82 pounds
~0 Gs
90 mm 0.25 kg / 0.55 pounds
402 Gs
0.04 kg / 0.08 pounds
37 g / 0.4 N
0.22 kg / 0.49 pounds
~0 Gs
100 mm 0.16 kg / 0.34 pounds
318 Gs
0.02 kg / 0.05 pounds
23 g / 0.2 N
0.14 kg / 0.31 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 50x20x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 19.0 cm
Hearing aid 10 Gs (1.0 mT) 15.0 cm
Mechanical watch 20 Gs (2.0 mT) 11.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 9.0 cm
Remote 50 Gs (5.0 mT) 8.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm

Table 8: Collisions (cracking risk) - warning
MPL 50x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.70 km/h
(5.20 m/s)
2.02 J
30 mm 29.46 km/h
(8.18 m/s)
5.02 J
50 mm 37.84 km/h
(10.51 m/s)
8.29 J
100 mm 53.48 km/h
(14.86 m/s)
16.55 J

Table 9: Corrosion resistance
MPL 50x20x20 / 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: Construction data (Flux)
MPL 50x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 46 654 Mx 466.5 µWb
Pc Coefficient 0.63 High (Stable)

Table 11: Hydrostatics and buoyancy
MPL 50x20x20 / N38

Environment Effective steel pull Effect
Air (land) 42.18 kg Standard
Water (riverbed) 48.30 kg
(+6.12 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.63

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.

Technical specification and ecology
Chemical composition
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: 020166-2026
Measurement Calculator
Pulling force

Magnetic Field

Check out also proposals

This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 50x20x20 mm and a weight of 150 g, guarantees the highest quality connection. This rectangular block with a force of 413.81 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 50x20x20 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 50x20x20 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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 50x20x20 / N38 model is magnetized through the thickness (dimension 20 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), 20 mm (width), and 20 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 42.18 kg (force ~413.81 N), which, with such a flat 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 exceptional magnetic power, neodymium magnets offer the following advantages:
  • They retain full power for around ten years – the loss is just ~1% (according to analyses),
  • They are resistant to demagnetization induced by external magnetic fields,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnetic induction on the surface of the magnet is impressive,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to versatility in forming and the capacity to adapt to unusual requirements,
  • Huge importance in electronics industry – they are utilized in hard drives, electromotive mechanisms, medical devices, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in small systems

Limitations

What to avoid - cons of neodymium magnets: tips and applications.
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their strength 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 stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum magnetic pulling forcewhat it depends on?

Information about lifting capacity is the result of a measurement for the most favorable conditions, assuming:
  • on a block made of structural steel, optimally conducting the magnetic field
  • whose thickness is min. 10 mm
  • with an ground touching surface
  • under conditions of ideal adhesion (surface-to-surface)
  • for force acting at a right angle (in the magnet axis)
  • at temperature room level

What influences lifting capacity in practice

Real force is influenced by specific conditions, such as (from most important):
  • Distance – existence of any layer (rust, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the holding force.

H&S for magnets
Cards and drives

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

Risk of cracking

Protect your eyes. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Adults only

NdFeB magnets are not suitable for play. Swallowing a few magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates urgent medical intervention.

Handling guide

Handle magnets consciously. Their immense force can shock even experienced users. Be vigilant and do not underestimate their force.

Hand protection

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Dust is flammable

Powder generated during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Threat to navigation

Remember: neodymium magnets produce a field that disrupts precision electronics. Maintain a safe distance from your mobile, device, and navigation systems.

Demagnetization risk

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

Medical implants

For implant holders: Powerful magnets disrupt electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Sensitization to coating

Certain individuals experience a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Extended handling might lead to a rash. We recommend wear safety gloves.

Important! Need more info? Check our post: Are neodymium magnets dangerous?