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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

bulk discounts:

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Lifting power as well as structure of a neodymium magnet can be estimated using our modular calculator.

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Detailed specification - 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

Physical simulation of the product - technical parameters

These data are the result of a physical simulation. Values rely on algorithms for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Please consider these calculations as a reference point for designers.

Table 1: Static pull force (pull vs gap) - characteristics
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 LBS
42180.0 g / 413.8 N
crushing
1 mm 4452 Gs
445.2 mT
36.46 kg / 80.38 LBS
36461.5 g / 357.7 N
crushing
2 mm 4114 Gs
411.4 mT
31.13 kg / 68.62 LBS
31126.5 g / 305.4 N
crushing
3 mm 3784 Gs
378.4 mT
26.34 kg / 58.06 LBS
26336.3 g / 258.4 N
crushing
5 mm 3173 Gs
317.3 mT
18.52 kg / 40.84 LBS
18523.4 g / 181.7 N
crushing
10 mm 2022 Gs
202.2 mT
7.52 kg / 16.59 LBS
7522.9 g / 73.8 N
medium risk
15 mm 1324 Gs
132.4 mT
3.22 kg / 7.10 LBS
3222.6 g / 31.6 N
medium risk
20 mm 899 Gs
89.9 mT
1.49 kg / 3.28 LBS
1487.5 g / 14.6 N
low risk
30 mm 458 Gs
45.8 mT
0.39 kg / 0.85 LBS
385.8 g / 3.8 N
low risk
50 mm 159 Gs
15.9 mT
0.05 kg / 0.10 LBS
46.4 g / 0.5 N
low risk

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

Table 3: Vertical assembly (shearing) - 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 LBS
12654.0 g / 124.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.44 kg / 18.60 LBS
8436.0 g / 82.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.22 kg / 9.30 LBS
4218.0 g / 41.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
21.09 kg / 46.50 LBS
21090.0 g / 206.9 N

Table 4: Material efficiency (substrate influence) - 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 LBS
2109.0 g / 20.7 N
1 mm
13%
5.27 kg / 11.62 LBS
5272.5 g / 51.7 N
2 mm
25%
10.55 kg / 23.25 LBS
10545.0 g / 103.4 N
3 mm
38%
15.82 kg / 34.87 LBS
15817.5 g / 155.2 N
5 mm
63%
26.36 kg / 58.12 LBS
26362.5 g / 258.6 N
10 mm
100%
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
11 mm
100%
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
12 mm
100%
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N

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

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

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 50x20x20 / N38

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

Table 7: Protective zones (electronics) - warnings
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
Mobile device 40 Gs (4.0 mT) 9.0 cm
Car key 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: Impact energy (kinetic energy) - 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: Surface protection spec
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 (Pc)
MPL 50x20x20 / N38

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

Table 11: Physics of underwater searching
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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

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

2. Plate thickness effect

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

3. Heat tolerance

*For standard magnets, the critical 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
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: 020166-2026
Measurement Calculator
Force (pull)

Magnetic Induction

See more products

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 50x20x20 mm and a weight of 150 g, guarantees premium class connection. As a block magnet with high power (approx. 42.18 kg), this product is available off-the-shelf from our warehouse in Poland. 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 42.18 kg can pinch very hard and cause hematomas. 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. Thanks to the flat surface and high force (approx. 42.18 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for workshop organization 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. 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 50x20x20 / N38 model is magnetized axially (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). It is a magnetic block with dimensions 50x20x20 mm and a self-weight of 150 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros and cons of rare earth magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They maintain their magnetic properties even under strong external field,
  • Thanks to the metallic finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an clean appearance,
  • Magnetic induction on the working part of the magnet remains very high,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of exact modeling as well as modifying to complex applications,
  • Wide application in advanced technology sectors – they are utilized in mass storage devices, brushless drives, medical equipment, as well as industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Limitations

Characteristics of disadvantages of neodymium magnets and ways of using them
  • At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their power 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, small components of these magnets can complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum lifting capacity of the magnetwhat it depends on?

Magnet power is the result of a measurement for ideal contact conditions, including:
  • with the use of a yoke made of special test steel, ensuring full magnetic saturation
  • whose thickness is min. 10 mm
  • with a plane cleaned and smooth
  • with zero gap (no coatings)
  • under vertical application of breakaway force (90-degree angle)
  • in neutral thermal conditions

Magnet lifting force in use – key factors

It is worth knowing that the working load will differ influenced by elements below, in order of importance:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Safe handling of neodymium magnets
Keep away from electronics

Be aware: neodymium magnets produce a field that disrupts precision electronics. Keep a safe distance from your phone, device, and GPS.

Keep away from children

Neodymium magnets are not suitable for play. Swallowing multiple magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and requires immediate surgery.

Finger safety

Watch your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Magnets are brittle

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Dust is flammable

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Handling rules

Use magnets consciously. Their powerful strength can shock even professionals. Be vigilant and respect their power.

Magnetic media

Powerful magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.

Pacemakers

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

Maximum temperature

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Nickel coating and allergies

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, immediately stop working with magnets and use protective gear.

Warning! Looking for details? Check our post: Are neodymium magnets dangerous?