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MPL 50x50x25 / N38 - lamellar magnet

lamellar magnet

Catalog no 020168

GTIN/EAN: 5906301811749

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

159.90 with VAT / pcs + price for transport

130.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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Weight and structure of neodymium magnets can be analyzed on our magnetic calculator.

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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

Technical modeling of the magnet - report

Presented data are the result of a physical simulation. Results rely on algorithms for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
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
dangerous!
1 mm 3999 Gs
399.9 mT
84.79 kg / 186.94 LBS
84794.0 g / 831.8 N
dangerous!
2 mm 3861 Gs
386.1 mT
79.04 kg / 174.25 LBS
79038.6 g / 775.4 N
dangerous!
3 mm 3720 Gs
372.0 mT
73.38 kg / 161.78 LBS
73381.8 g / 719.9 N
dangerous!
5 mm 3435 Gs
343.5 mT
62.56 kg / 137.93 LBS
62564.2 g / 613.8 N
dangerous!
10 mm 2742 Gs
274.2 mT
39.87 kg / 87.90 LBS
39868.7 g / 391.1 N
dangerous!
15 mm 2137 Gs
213.7 mT
24.21 kg / 53.37 LBS
24210.4 g / 237.5 N
dangerous!
20 mm 1649 Gs
164.9 mT
14.41 kg / 31.77 LBS
14409.9 g / 141.4 N
dangerous!
30 mm 988 Gs
98.8 mT
5.17 kg / 11.40 LBS
5170.9 g / 50.7 N
warning
50 mm 399 Gs
39.9 mT
0.85 kg / 1.86 LBS
845.8 g / 8.3 N
low risk

Table 2: Sliding load (wall)
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: Wall mounting (sliding) - 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 (substrate influence) - 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: Working in heat (stability) - resistance threshold
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) Shear 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 (electronics) - 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
Timepiece 20 Gs (2.0 mT) 17.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 13.5 cm
Car key 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 17.45 km/h
(4.85 m/s)
5.51 J
30 mm 25.13 km/h
(6.98 m/s)
11.42 J
50 mm 31.52 km/h
(8.76 m/s)
17.97 J
100 mm 44.33 km/h
(12.31 m/s)
35.54 J

Table 9: Coating parameters (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: Electrical 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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Caution: On a vertical wall, the magnet holds just ~20% of its max power.

2. Plate thickness effect

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

3. Thermal stability

*For N38 material, 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

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%
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: 020168-2026
Quick Unit Converter
Magnet pull force

Field Strength

Other proposals

Model MPL 50x50x25 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 888.15 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 50x50x25 / 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 50x50x25 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners 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 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. 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.
This model is characterized by dimensions 50x50x25 mm, which, at a weight of 468.75 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 90.53 kg (force ~888.15 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of rare earth magnets.

Benefits

In addition to their long-term stability, 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 feature excellent resistance to magnetic field loss as a result of external magnetic sources,
  • By applying a reflective coating of nickel, the element presents an aesthetic look,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to versatility in constructing and the ability to adapt to individual projects,
  • Key role in future technologies – they serve a role in computer drives, electric motors, advanced medical instruments, as well as industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • Neodymium magnets lose 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in creating nuts and complicated forms in magnets, we recommend using cover - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat affects it?

Breakaway force was determined for the most favorable conditions, assuming:
  • using a base made of mild steel, serving as a magnetic yoke
  • with a thickness of at least 10 mm
  • with a surface perfectly flat
  • without the slightest insulating layer between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

During everyday use, the real power is determined by several key aspects, ranked from most significant:
  • Air gap (betwixt the magnet and the plate), as even a very small distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, rust or debris).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material type – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Fragile material

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Crushing risk

Risk of injury: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Handling guide

Be careful. Neodymium magnets act from a distance and connect with huge force, often faster than you can react.

Do not overheat magnets

Keep cool. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Life threat

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Nickel allergy

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, cease handling magnets and use protective gear.

GPS and phone interference

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.

Product not for children

Strictly store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are life-threatening.

Threat to electronics

Data protection: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, timepieces).

Fire risk

Fire hazard: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Danger! Details about hazards in the article: Magnet Safety Guide.