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MPL 50x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020473

GTIN/EAN: 5906301811930

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

37.5 g

Magnetization Direction

↑ axial

Load capacity

12.69 kg / 124.48 N

Magnetic Induction

197.73 mT / 1977 Gs

Coating

[NiCuNi] Nickel

14.56 with VAT / pcs + price for transport

11.84 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 50x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020473
GTIN/EAN 5906301811930
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 5 mm [±0,1 mm]
Weight 37.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 12.69 kg / 124.48 N
Magnetic Induction ~ ? 197.73 mT / 1977 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x5 / 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 magnet - technical parameters

The following information represent the result of a mathematical calculation. Results are based on models for the class Nd2Fe14B. Real-world performance might slightly differ. Treat these data as a supplementary guide when designing systems.

Table 1: Static force (force vs distance) - power drop
MPL 50x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1977 Gs
197.7 mT
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
crushing
1 mm 1885 Gs
188.5 mT
11.53 kg / 25.42 lbs
11530.3 g / 113.1 N
crushing
2 mm 1772 Gs
177.2 mT
10.20 kg / 22.49 lbs
10199.9 g / 100.1 N
crushing
3 mm 1649 Gs
164.9 mT
8.83 kg / 19.47 lbs
8831.3 g / 86.6 N
strong
5 mm 1395 Gs
139.5 mT
6.32 kg / 13.93 lbs
6320.3 g / 62.0 N
strong
10 mm 870 Gs
87.0 mT
2.46 kg / 5.42 lbs
2459.4 g / 24.1 N
strong
15 mm 549 Gs
54.9 mT
0.98 kg / 2.15 lbs
976.9 g / 9.6 N
low risk
20 mm 359 Gs
35.9 mT
0.42 kg / 0.92 lbs
418.9 g / 4.1 N
low risk
30 mm 172 Gs
17.2 mT
0.10 kg / 0.21 lbs
95.7 g / 0.9 N
low risk
50 mm 54 Gs
5.4 mT
0.01 kg / 0.02 lbs
9.5 g / 0.1 N
low risk

Table 2: Shear hold (vertical surface)
MPL 50x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.54 kg / 5.60 lbs
2538.0 g / 24.9 N
1 mm Stal (~0.2) 2.31 kg / 5.08 lbs
2306.0 g / 22.6 N
2 mm Stal (~0.2) 2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
3 mm Stal (~0.2) 1.77 kg / 3.89 lbs
1766.0 g / 17.3 N
5 mm Stal (~0.2) 1.26 kg / 2.79 lbs
1264.0 g / 12.4 N
10 mm Stal (~0.2) 0.49 kg / 1.08 lbs
492.0 g / 4.8 N
15 mm Stal (~0.2) 0.20 kg / 0.43 lbs
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 50x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.81 kg / 8.39 lbs
3807.0 g / 37.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.54 kg / 5.60 lbs
2538.0 g / 24.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.27 kg / 2.80 lbs
1269.0 g / 12.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.35 kg / 13.99 lbs
6345.0 g / 62.2 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 50x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.63 kg / 1.40 lbs
634.5 g / 6.2 N
1 mm
13%
1.59 kg / 3.50 lbs
1586.3 g / 15.6 N
2 mm
25%
3.17 kg / 6.99 lbs
3172.5 g / 31.1 N
3 mm
38%
4.76 kg / 10.49 lbs
4758.8 g / 46.7 N
5 mm
63%
7.93 kg / 17.49 lbs
7931.2 g / 77.8 N
10 mm
100%
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
11 mm
100%
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
12 mm
100%
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N

Table 5: Thermal resistance (stability) - thermal limit
MPL 50x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
OK
40 °C -2.2% 12.41 kg / 27.36 lbs
12410.8 g / 121.8 N
OK
60 °C -4.4% 12.13 kg / 26.75 lbs
12131.6 g / 119.0 N
80 °C -6.6% 11.85 kg / 26.13 lbs
11852.5 g / 116.3 N
100 °C -28.8% 9.04 kg / 19.92 lbs
9035.3 g / 88.6 N

Table 6: Two magnets (attraction) - field collision
MPL 50x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 24.10 kg / 53.12 lbs
3 371 Gs
3.61 kg / 7.97 lbs
3614 g / 35.5 N
N/A
1 mm 23.06 kg / 50.84 lbs
3 868 Gs
3.46 kg / 7.63 lbs
3459 g / 33.9 N
20.75 kg / 45.75 lbs
~0 Gs
2 mm 21.89 kg / 48.27 lbs
3 769 Gs
3.28 kg / 7.24 lbs
3284 g / 32.2 N
19.71 kg / 43.44 lbs
~0 Gs
3 mm 20.65 kg / 45.53 lbs
3 661 Gs
3.10 kg / 6.83 lbs
3098 g / 30.4 N
18.59 kg / 40.98 lbs
~0 Gs
5 mm 18.07 kg / 39.83 lbs
3 424 Gs
2.71 kg / 5.97 lbs
2710 g / 26.6 N
16.26 kg / 35.84 lbs
~0 Gs
10 mm 12.00 kg / 26.46 lbs
2 790 Gs
1.80 kg / 3.97 lbs
1800 g / 17.7 N
10.80 kg / 23.81 lbs
~0 Gs
20 mm 4.67 kg / 10.30 lbs
1 741 Gs
0.70 kg / 1.54 lbs
701 g / 6.9 N
4.20 kg / 9.27 lbs
~0 Gs
50 mm 0.37 kg / 0.81 lbs
488 Gs
0.06 kg / 0.12 lbs
55 g / 0.5 N
0.33 kg / 0.73 lbs
~0 Gs
60 mm 0.18 kg / 0.40 lbs
343 Gs
0.03 kg / 0.06 lbs
27 g / 0.3 N
0.16 kg / 0.36 lbs
~0 Gs
70 mm 0.10 kg / 0.21 lbs
248 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
0.09 kg / 0.19 lbs
~0 Gs
80 mm 0.05 kg / 0.12 lbs
184 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
0.05 kg / 0.10 lbs
~0 Gs
90 mm 0.03 kg / 0.07 lbs
140 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
0.03 kg / 0.06 lbs
~0 Gs
100 mm 0.02 kg / 0.04 lbs
108 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.04 lbs
~0 Gs

Table 7: Protective zones (electronics) - precautionary measures
MPL 50x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Timepiece 20 Gs (2.0 mT) 7.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.0 cm
Remote 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (kinetic energy) - warning
MPL 50x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.68 km/h
(5.74 m/s)
0.62 J
30 mm 32.28 km/h
(8.97 m/s)
1.51 J
50 mm 41.50 km/h
(11.53 m/s)
2.49 J
100 mm 58.67 km/h
(16.30 m/s)
4.98 J

Table 9: Surface protection spec
MPL 50x20x5 / 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 50x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 20 792 Mx 207.9 µWb
Pc Coefficient 0.21 Low (Flat)

Table 11: Physics of underwater searching
MPL 50x20x5 / N38

Environment Effective steel pull Effect
Air (land) 12.69 kg Standard
Water (riverbed) 14.53 kg
(+1.84 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds merely ~20% of its nominal pull.

2. Efficiency vs thickness

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

3. Temperature resistance

*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) = 0.21

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%
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: 020473-2026
Magnet Unit Converter
Pulling force

Magnetic Field

Other proposals

Model MPL 50x20x5 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. As a block magnet with high power (approx. 12.69 kg), this product is available off-the-shelf from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 50x20x5 / 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 50x20x5 / 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. 12.69 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 50x20x5 / N38, it is best to use 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. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 50x20x5 / N38 model is magnetized through the thickness (dimension 5 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 (50x20 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 50x20x5 mm, which, at a weight of 37.5 g, makes it an element with high energy density. It is a magnetic block with dimensions 50x20x5 mm and a self-weight of 37.5 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of neodymium magnets.

Benefits

Apart from their consistent power, neodymium magnets have these key benefits:
  • Their strength is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
  • They are noted for resistance to demagnetization induced by external magnetic fields,
  • In other words, due to the smooth finish of silver, the element becomes visually attractive,
  • Magnets have extremely high magnetic induction on the working surface,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Due to the option of precise forming and adaptation to individualized projects, magnetic components can be manufactured in a wide range of forms and dimensions, which makes them more universal,
  • Huge importance in electronics industry – they are used in data components, electromotive mechanisms, advanced medical instruments, and multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited possibility of creating nuts in the magnet and complicated shapes - preferred is a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical after entering the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Lifting parameters

Magnetic strength at its maximum – what affects it?

Information about lifting capacity was determined for ideal contact conditions, assuming:
  • using a base made of low-carbon steel, functioning as a circuit closing element
  • whose thickness equals approx. 10 mm
  • with an polished contact surface
  • with zero gap (without impurities)
  • for force applied at a right angle (in the magnet axis)
  • at standard ambient temperature

Key elements affecting lifting force

In practice, the actual lifting capacity results from a number of factors, listed from the most important:
  • Gap (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Steel thickness – too thin steel causes magnetic saturation, causing part of the flux to be escaped to the other side.
  • Plate material – low-carbon steel gives the best results. Higher carbon content decrease magnetic permeability and holding force.
  • Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Precautions when working with neodymium magnets
GPS Danger

An intense magnetic field disrupts the functioning of magnetometers in phones and GPS navigation. Keep magnets close to a device to prevent damaging the sensors.

Warning for allergy sufferers

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands or select encased magnets.

Product not for children

Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are life-threatening.

Operating temperature

Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Health Danger

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.

Safe operation

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

Do not drill into magnets

Mechanical processing of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Magnet fragility

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them breaking into shards.

Serious injuries

Large magnets can break fingers instantly. Never put your hand between two attracting surfaces.

Electronic devices

Device Safety: Strong magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

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

e-mail: bok@dhit.pl

tel: +48 888 99 98 98