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MPL 50x50x25 / N38 - lamellar magnet

lamellar magnet

Catalog no 020168

GTIN/EAN: 5906301811749

Load capacity 90.53 kg / 888.15 N Magnetic Induction 413.25 mT / 4133 Gs
length
50 mm [±0,1 mm]
Width
50 mm [±0,1 mm]
Height
25 mm [±0,1 mm]
Weight
468.75 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

159.90 with VAT / pcs + price for transport

130.00 zł net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical of the product - MPL 50x50x25 / N38 - lamellar magnet

Specification / characteristics - MPL 50x50x25 / N38 - lamellar magnet

properties
properties values
Cat. no. 020168
GTIN/EAN 5906301811749
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 50 mm [±0,1 mm]
Height 25 mm [±0,1 mm]
Weight 468.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 90.53 kg / 888.15 N
Magnetic Induction ~ ? 413.25 mT / 4133 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x50x25 / 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 magnet - data

Presented values constitute the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MPL 50x50x25 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4132 Gs
413.2 mT
90.53 kg / 199.58 LBS
90530.0 g / 888.1 N
critical level
1 mm 3999 Gs
399.9 mT
84.79 kg / 186.94 LBS
84794.0 g / 831.8 N
critical level
2 mm 3861 Gs
386.1 mT
79.04 kg / 174.25 LBS
79038.6 g / 775.4 N
critical level
3 mm 3720 Gs
372.0 mT
73.38 kg / 161.78 LBS
73381.8 g / 719.9 N
critical level
5 mm 3435 Gs
343.5 mT
62.56 kg / 137.93 LBS
62564.2 g / 613.8 N
critical level
10 mm 2742 Gs
274.2 mT
39.87 kg / 87.90 LBS
39868.7 g / 391.1 N
critical level
15 mm 2137 Gs
213.7 mT
24.21 kg / 53.37 LBS
24210.4 g / 237.5 N
critical level
20 mm 1649 Gs
164.9 mT
14.41 kg / 31.77 LBS
14409.9 g / 141.4 N
critical level
30 mm 988 Gs
98.8 mT
5.17 kg / 11.40 LBS
5170.9 g / 50.7 N
strong
50 mm 399 Gs
39.9 mT
0.85 kg / 1.86 LBS
845.8 g / 8.3 N
weak grip

Table 2: Sliding hold (vertical surface)
MPL 50x50x25 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 18.11 kg / 39.92 LBS
18106.0 g / 177.6 N
1 mm Stal (~0.2) 16.96 kg / 37.39 LBS
16958.0 g / 166.4 N
2 mm Stal (~0.2) 15.81 kg / 34.85 LBS
15808.0 g / 155.1 N
3 mm Stal (~0.2) 14.68 kg / 32.36 LBS
14676.0 g / 144.0 N
5 mm Stal (~0.2) 12.51 kg / 27.58 LBS
12512.0 g / 122.7 N
10 mm Stal (~0.2) 7.97 kg / 17.58 LBS
7974.0 g / 78.2 N
15 mm Stal (~0.2) 4.84 kg / 10.67 LBS
4842.0 g / 47.5 N
20 mm Stal (~0.2) 2.88 kg / 6.35 LBS
2882.0 g / 28.3 N
30 mm Stal (~0.2) 1.03 kg / 2.28 LBS
1034.0 g / 10.1 N
50 mm Stal (~0.2) 0.17 kg / 0.37 LBS
170.0 g / 1.7 N

Table 3: Vertical assembly (shearing) - vertical pull
MPL 50x50x25 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
27.16 kg / 59.88 LBS
27159.0 g / 266.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
18.11 kg / 39.92 LBS
18106.0 g / 177.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
9.05 kg / 19.96 LBS
9053.0 g / 88.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
45.27 kg / 99.79 LBS
45265.0 g / 444.0 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 50x50x25 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
3.02 kg / 6.65 LBS
3017.7 g / 29.6 N
1 mm
8%
7.54 kg / 16.63 LBS
7544.2 g / 74.0 N
2 mm
17%
15.09 kg / 33.26 LBS
15088.3 g / 148.0 N
3 mm
25%
22.63 kg / 49.90 LBS
22632.5 g / 222.0 N
5 mm
42%
37.72 kg / 83.16 LBS
37720.8 g / 370.0 N
10 mm
83%
75.44 kg / 166.32 LBS
75441.7 g / 740.1 N
11 mm
92%
82.99 kg / 182.95 LBS
82985.8 g / 814.1 N
12 mm
100%
90.53 kg / 199.58 LBS
90530.0 g / 888.1 N

Table 5: Thermal stability (stability) - power drop
MPL 50x50x25 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 90.53 kg / 199.58 LBS
90530.0 g / 888.1 N
OK
40 °C -2.2% 88.54 kg / 195.19 LBS
88538.3 g / 868.6 N
OK
60 °C -4.4% 86.55 kg / 190.80 LBS
86546.7 g / 849.0 N
80 °C -6.6% 84.56 kg / 186.41 LBS
84555.0 g / 829.5 N
100 °C -28.8% 64.46 kg / 142.10 LBS
64457.4 g / 632.3 N

Table 6: Two magnets (repulsion) - field collision
MPL 50x50x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 263.15 kg / 580.14 LBS
5 403 Gs
39.47 kg / 87.02 LBS
39472 g / 387.2 N
N/A
1 mm 254.89 kg / 561.94 LBS
8 133 Gs
38.23 kg / 84.29 LBS
38234 g / 375.1 N
229.40 kg / 505.75 LBS
~0 Gs
2 mm 246.47 kg / 543.38 LBS
7 998 Gs
36.97 kg / 81.51 LBS
36971 g / 362.7 N
221.83 kg / 489.04 LBS
~0 Gs
3 mm 238.08 kg / 524.88 LBS
7 861 Gs
35.71 kg / 78.73 LBS
35713 g / 350.3 N
214.28 kg / 472.40 LBS
~0 Gs
5 mm 221.48 kg / 488.27 LBS
7 582 Gs
33.22 kg / 73.24 LBS
33222 g / 325.9 N
199.33 kg / 439.45 LBS
~0 Gs
10 mm 181.86 kg / 400.93 LBS
6 870 Gs
27.28 kg / 60.14 LBS
27279 g / 267.6 N
163.67 kg / 360.83 LBS
~0 Gs
20 mm 115.89 kg / 255.49 LBS
5 484 Gs
17.38 kg / 38.32 LBS
17383 g / 170.5 N
104.30 kg / 229.94 LBS
~0 Gs
50 mm 24.93 kg / 54.97 LBS
2 544 Gs
3.74 kg / 8.25 LBS
3740 g / 36.7 N
22.44 kg / 49.47 LBS
~0 Gs
60 mm 15.03 kg / 33.14 LBS
1 975 Gs
2.25 kg / 4.97 LBS
2255 g / 22.1 N
13.53 kg / 29.82 LBS
~0 Gs
70 mm 9.24 kg / 20.37 LBS
1 548 Gs
1.39 kg / 3.05 LBS
1386 g / 13.6 N
8.31 kg / 18.33 LBS
~0 Gs
80 mm 5.81 kg / 12.80 LBS
1 228 Gs
0.87 kg / 1.92 LBS
871 g / 8.5 N
5.23 kg / 11.52 LBS
~0 Gs
90 mm 3.74 kg / 8.24 LBS
985 Gs
0.56 kg / 1.24 LBS
560 g / 5.5 N
3.36 kg / 7.41 LBS
~0 Gs
100 mm 2.46 kg / 5.42 LBS
799 Gs
0.37 kg / 0.81 LBS
369 g / 3.6 N
2.21 kg / 4.88 LBS
~0 Gs

Table 7: Hazards (implants) - warnings
MPL 50x50x25 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 28.0 cm
Hearing aid 10 Gs (1.0 mT) 22.0 cm
Mechanical watch 20 Gs (2.0 mT) 17.0 cm
Mobile device 40 Gs (4.0 mT) 13.5 cm
Remote 50 Gs (5.0 mT) 12.5 cm
Payment card 400 Gs (40.0 mT) 5.0 cm
HDD hard drive 600 Gs (60.0 mT) 4.5 cm

Table 8: Impact energy (kinetic energy) - warning
MPL 50x50x25 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.56 km/h
(5.16 m/s)
6.23 J
30 mm 23.02 km/h
(6.39 m/s)
9.58 J
50 mm 23.56 km/h
(6.54 m/s)
10.04 J
100 mm 23.69 km/h
(6.58 m/s)
10.15 J

Table 9: Anti-corrosion coating durability
MPL 50x50x25 / 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 50x50x25 / N38

Parameter Value SI Unit / Description
Magnetic Flux 105 093 Mx 1050.9 µWb
Pc Coefficient 0.54 Low (Flat)

Table 11: Physics of underwater searching
MPL 50x50x25 / N38

Environment Effective steel pull Effect
Air (land) 90.53 kg Standard
Water (riverbed) 103.66 kg
(+13.13 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

1. Vertical hold

*Caution: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Heat tolerance

*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) = 0.54

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%

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: 020168-2026
Measurement Calculator

Magnet pull force


Magnetic Field

Other offers

Component MPL 50x50x25 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 90.53 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 90.53 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 50x50x25 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 90.53 kg), they are ideal as closers 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. 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 50x50x25 / N38 model is magnetized through the thickness (dimension 25 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 (50x50 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.
The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 50 mm (width), and 25 mm (thickness). It is a magnetic block with dimensions 50x50x25 mm and a self-weight of 468.75 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.

Advantages

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under external field action,
  • In other words, due to the shiny finish of nickel, the element gains visual value,
  • Magnets are characterized by maximum magnetic induction on the outer side,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to flexibility in constructing and the ability to customize to specific needs,
  • Significant place in high-tech industry – they are commonly used in computer drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

The specified lifting capacity refers to the limit force, obtained under ideal test conditions, meaning:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • under axial force direction (90-degree angle)
  • at standard ambient temperature

Lifting capacity in real conditions – factors

Real force impacted by specific conditions, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Shattering risk

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Safe distance

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Handling guide

Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Product not for children

These products are not toys. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

Health Danger

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Dust is flammable

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Pinching danger

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

Compass and GPS

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.

Warning! Details about risks in the article: Safety of working with magnets.