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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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Technical - 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 analysis of the product - data

These data represent the result of a engineering analysis. Values are based on models for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - interaction chart
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
dangerous!
1 mm 4452 Gs
445.2 mT
36.46 kg / 80.38 pounds
36461.5 g / 357.7 N
dangerous!
2 mm 4114 Gs
411.4 mT
31.13 kg / 68.62 pounds
31126.5 g / 305.4 N
dangerous!
3 mm 3784 Gs
378.4 mT
26.34 kg / 58.06 pounds
26336.3 g / 258.4 N
dangerous!
5 mm 3173 Gs
317.3 mT
18.52 kg / 40.84 pounds
18523.4 g / 181.7 N
dangerous!
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
safe
30 mm 458 Gs
45.8 mT
0.39 kg / 0.85 pounds
385.8 g / 3.8 N
safe
50 mm 159 Gs
15.9 mT
0.05 kg / 0.10 pounds
46.4 g / 0.5 N
safe

Table 2: Slippage hold (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 (shearing) - vertical pull
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: Steel thickness (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 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) - forces in the system
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 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: Protective zones (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
Timepiece 20 Gs (2.0 mT) 11.5 cm
Mobile device 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: 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: Anti-corrosion coating durability
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: Submerged application
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.

3. Thermal stability

*For N38 material, 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

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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 and environmental data
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%
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: 020166-2026
Quick Unit Converter
Magnet pull force

Field Strength

Check out also proposals

This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 50x20x20 mm and a weight of 150 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 42.18 kg), this product is available immediately 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 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. 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 magnetic separators 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.
For mounting flat magnets MPL 50x20x20 / N38, we recommend utilizing 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.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
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.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even after around 10 years – the decrease in strength is only ~1% (based on measurements),
  • They retain their magnetic properties even under close interference source,
  • Thanks to the shiny finish, the layer of nickel, gold-plated, or silver gives an visually attractive appearance,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of exact shaping as well as adjusting to individual applications,
  • Fundamental importance in modern technologies – they serve a role in magnetic memories, electric motors, advanced medical instruments, and multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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, when using outdoors
  • Due to limitations in producing nuts and complex forms in magnets, we recommend using cover - magnetic holder.
  • Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

The load parameter shown concerns the peak performance, obtained under optimal environment, meaning:
  • on a plate made of structural steel, optimally conducting the magnetic flux
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • characterized by even structure
  • without the slightest air gap between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at room temperature

Practical aspects of lifting capacity – factors

In real-world applications, the actual holding force is determined by several key aspects, ranked from crucial:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the holding force.

Precautions when working with NdFeB magnets
Dust explosion hazard

Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Threat to electronics

Equipment safety: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, hearing aids, timepieces).

Risk of cracking

Beware of splinters. Magnets can fracture upon violent connection, ejecting shards into the air. We recommend safety glasses.

Health Danger

For implant holders: Powerful magnets affect electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Nickel allergy

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness appears, cease handling magnets and use protective gear.

Caution required

Handle with care. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can react.

Precision electronics

An intense magnetic field interferes with the functioning of compasses in phones and GPS navigation. Keep magnets near a smartphone to avoid damaging the sensors.

Product not for children

Only for adults. Small elements can be swallowed, leading to intestinal necrosis. Store out of reach of kids and pets.

Hand protection

Protect your hands. Two large magnets will join instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Heat warning

Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. This process is irreversible.

Caution! Details about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98