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MPL 50x25x12 / N38 - lamellar magnet

lamellar magnet

Catalog no 020343

GTIN/EAN: 5906301811855

5.00

length

50 mm [±0,1 mm]

Width

25 mm [±0,1 mm]

Height

12 mm [±0,1 mm]

Weight

112.5 g

Magnetization Direction

↑ axial

Load capacity

37.12 kg / 364.18 N

Magnetic Induction

340.43 mT / 3404 Gs

Coating

[NiCuNi] Nickel

45.51 with VAT / pcs + price for transport

37.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical - MPL 50x25x12 / N38 - lamellar magnet

Specification / characteristics - MPL 50x25x12 / N38 - lamellar magnet

properties
properties values
Cat. no. 020343
GTIN/EAN 5906301811855
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 25 mm [±0,1 mm]
Height 12 mm [±0,1 mm]
Weight 112.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 37.12 kg / 364.18 N
Magnetic Induction ~ ? 340.43 mT / 3404 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x25x12 / 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 simulation of the assembly - technical parameters

These information are the outcome of a mathematical analysis. Results rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ. Treat these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
MPL 50x25x12 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3404 Gs
340.4 mT
37.12 kg / 81.84 lbs
37120.0 g / 364.1 N
dangerous!
1 mm 3234 Gs
323.4 mT
33.50 kg / 73.86 lbs
33501.5 g / 328.6 N
dangerous!
2 mm 3052 Gs
305.2 mT
29.85 kg / 65.80 lbs
29847.1 g / 292.8 N
dangerous!
3 mm 2866 Gs
286.6 mT
26.32 kg / 58.02 lbs
26317.3 g / 258.2 N
dangerous!
5 mm 2496 Gs
249.6 mT
19.97 kg / 44.02 lbs
19965.4 g / 195.9 N
dangerous!
10 mm 1702 Gs
170.2 mT
9.28 kg / 20.45 lbs
9278.2 g / 91.0 N
medium risk
15 mm 1151 Gs
115.1 mT
4.25 kg / 9.36 lbs
4246.0 g / 41.7 N
medium risk
20 mm 792 Gs
79.2 mT
2.01 kg / 4.44 lbs
2012.1 g / 19.7 N
medium risk
30 mm 404 Gs
40.4 mT
0.52 kg / 1.15 lbs
523.0 g / 5.1 N
low risk
50 mm 137 Gs
13.7 mT
0.06 kg / 0.13 lbs
60.1 g / 0.6 N
low risk

Table 2: Vertical force (wall)
MPL 50x25x12 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 7.42 kg / 16.37 lbs
7424.0 g / 72.8 N
1 mm Stal (~0.2) 6.70 kg / 14.77 lbs
6700.0 g / 65.7 N
2 mm Stal (~0.2) 5.97 kg / 13.16 lbs
5970.0 g / 58.6 N
3 mm Stal (~0.2) 5.26 kg / 11.61 lbs
5264.0 g / 51.6 N
5 mm Stal (~0.2) 3.99 kg / 8.81 lbs
3994.0 g / 39.2 N
10 mm Stal (~0.2) 1.86 kg / 4.09 lbs
1856.0 g / 18.2 N
15 mm Stal (~0.2) 0.85 kg / 1.87 lbs
850.0 g / 8.3 N
20 mm Stal (~0.2) 0.40 kg / 0.89 lbs
402.0 g / 3.9 N
30 mm Stal (~0.2) 0.10 kg / 0.23 lbs
104.0 g / 1.0 N
50 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 N

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 50x25x12 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
11.14 kg / 24.55 lbs
11136.0 g / 109.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
7.42 kg / 16.37 lbs
7424.0 g / 72.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.71 kg / 8.18 lbs
3712.0 g / 36.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
18.56 kg / 40.92 lbs
18560.0 g / 182.1 N

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 50x25x12 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.86 kg / 4.09 lbs
1856.0 g / 18.2 N
1 mm
13%
4.64 kg / 10.23 lbs
4640.0 g / 45.5 N
2 mm
25%
9.28 kg / 20.46 lbs
9280.0 g / 91.0 N
3 mm
38%
13.92 kg / 30.69 lbs
13920.0 g / 136.6 N
5 mm
63%
23.20 kg / 51.15 lbs
23200.0 g / 227.6 N
10 mm
100%
37.12 kg / 81.84 lbs
37120.0 g / 364.1 N
11 mm
100%
37.12 kg / 81.84 lbs
37120.0 g / 364.1 N
12 mm
100%
37.12 kg / 81.84 lbs
37120.0 g / 364.1 N

Table 5: Working in heat (material behavior) - resistance threshold
MPL 50x25x12 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 37.12 kg / 81.84 lbs
37120.0 g / 364.1 N
OK
40 °C -2.2% 36.30 kg / 80.04 lbs
36303.4 g / 356.1 N
OK
60 °C -4.4% 35.49 kg / 78.23 lbs
35486.7 g / 348.1 N
80 °C -6.6% 34.67 kg / 76.43 lbs
34670.1 g / 340.1 N
100 °C -28.8% 26.43 kg / 58.27 lbs
26429.4 g / 259.3 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 50x25x12 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 89.28 kg / 196.82 lbs
4 856 Gs
13.39 kg / 29.52 lbs
13392 g / 131.4 N
N/A
1 mm 84.99 kg / 187.37 lbs
6 642 Gs
12.75 kg / 28.11 lbs
12749 g / 125.1 N
76.49 kg / 168.63 lbs
~0 Gs
2 mm 80.57 kg / 177.64 lbs
6 467 Gs
12.09 kg / 26.65 lbs
12086 g / 118.6 N
72.52 kg / 159.87 lbs
~0 Gs
3 mm 76.16 kg / 167.90 lbs
6 287 Gs
11.42 kg / 25.19 lbs
11424 g / 112.1 N
68.54 kg / 151.11 lbs
~0 Gs
5 mm 67.49 kg / 148.78 lbs
5 919 Gs
10.12 kg / 22.32 lbs
10123 g / 99.3 N
60.74 kg / 133.91 lbs
~0 Gs
10 mm 48.02 kg / 105.86 lbs
4 992 Gs
7.20 kg / 15.88 lbs
7203 g / 70.7 N
43.22 kg / 95.28 lbs
~0 Gs
20 mm 22.32 kg / 49.20 lbs
3 403 Gs
3.35 kg / 7.38 lbs
3347 g / 32.8 N
20.08 kg / 44.28 lbs
~0 Gs
50 mm 2.41 kg / 5.31 lbs
1 118 Gs
0.36 kg / 0.80 lbs
361 g / 3.5 N
2.17 kg / 4.78 lbs
~0 Gs
60 mm 1.26 kg / 2.77 lbs
808 Gs
0.19 kg / 0.42 lbs
189 g / 1.9 N
1.13 kg / 2.50 lbs
~0 Gs
70 mm 0.69 kg / 1.52 lbs
598 Gs
0.10 kg / 0.23 lbs
103 g / 1.0 N
0.62 kg / 1.37 lbs
~0 Gs
80 mm 0.39 kg / 0.87 lbs
452 Gs
0.06 kg / 0.13 lbs
59 g / 0.6 N
0.35 kg / 0.78 lbs
~0 Gs
90 mm 0.23 kg / 0.52 lbs
349 Gs
0.04 kg / 0.08 lbs
35 g / 0.3 N
0.21 kg / 0.47 lbs
~0 Gs
100 mm 0.14 kg / 0.32 lbs
274 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
0.13 kg / 0.29 lbs
~0 Gs

Table 7: Protective zones (electronics) - warnings
MPL 50x25x12 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 17.5 cm
Hearing aid 10 Gs (1.0 mT) 14.0 cm
Timepiece 20 Gs (2.0 mT) 11.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 8.5 cm
Remote 50 Gs (5.0 mT) 8.0 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm

Table 8: Collisions (cracking risk) - collision effects
MPL 50x25x12 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.99 km/h
(5.83 m/s)
1.91 J
30 mm 32.01 km/h
(8.89 m/s)
4.45 J
50 mm 41.00 km/h
(11.39 m/s)
7.30 J
100 mm 57.93 km/h
(16.09 m/s)
14.57 J

Table 9: Coating parameters (durability)
MPL 50x25x12 / 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 50x25x12 / N38

Parameter Value SI Unit / Description
Magnetic Flux 42 945 Mx 429.5 µWb
Pc Coefficient 0.40 Low (Flat)

Table 11: Physics of underwater searching
MPL 50x25x12 / N38

Environment Effective steel pull Effect
Air (land) 37.12 kg Standard
Water (riverbed) 42.50 kg
(+5.38 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

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

3. Thermal stability

*For standard magnets, the max working temp is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.40

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.

Engineering data and GPSR
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: 020343-2026
Measurement Calculator
Magnet pull force

Magnetic Induction

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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 50x25x12 mm and a weight of 112.5 g, guarantees the highest quality connection. As a block magnet with high power (approx. 37.12 kg), this product is available immediately from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating secures 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. Watch your fingers! Magnets with a force of 37.12 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 50x25x12 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners under tiles, wood, or glass. 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. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 50x25x12 / N38 model is magnetized axially (dimension 12 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 (50x25 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 50x25x12 mm, which, at a weight of 112.5 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 50x25x12 mm and a self-weight of 112.5 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of neodymium magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They have excellent resistance to weakening of magnetic properties due to external fields,
  • In other words, due to the metallic layer of gold, the element gains visual value,
  • They show high magnetic induction at the operating surface, which increases their power,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to flexibility in forming and the ability to adapt to complex applications,
  • Fundamental importance in high-tech industry – they find application in magnetic memories, motor assemblies, medical devices, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting capacity of the magnetwhat affects it?

The declared magnet strength concerns the peak performance, recorded under laboratory conditions, meaning:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by smoothness
  • without the slightest air gap between the magnet and steel
  • under perpendicular force direction (90-degree angle)
  • at standard ambient temperature

Magnet lifting force in use – key factors

Real force is influenced by working environment parameters, such as (from most important):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Material type – the best choice is high-permeability steel. Stainless steels may attract less.
  • Plate texture – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Warnings
Do not overheat magnets

Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Magnet fragility

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets will cause them cracking into shards.

Data carriers

Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Allergic reactions

A percentage of the population suffer from a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact may cause dermatitis. We strongly advise use protective gloves.

Pacemakers

Life threat: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Swallowing risk

These products are not toys. Accidental ingestion of multiple magnets can lead to them connecting inside the digestive tract, which poses a critical condition and necessitates urgent medical intervention.

Impact on smartphones

Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a separation from your phone, tablet, and GPS.

Respect the power

Handle magnets consciously. Their huge power can shock even professionals. Be vigilant and respect their power.

Do not drill into magnets

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Bodily injuries

Danger of trauma: The pulling power is so immense that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Important! Details 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