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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

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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

Engineering simulation of the assembly - technical parameters

Presented information represent the result of a mathematical calculation. Results rely on models for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - characteristics
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
critical level
1 mm 3234 Gs
323.4 mT
33.50 kg / 73.86 LBS
33501.5 g / 328.6 N
critical level
2 mm 3052 Gs
305.2 mT
29.85 kg / 65.80 LBS
29847.1 g / 292.8 N
critical level
3 mm 2866 Gs
286.6 mT
26.32 kg / 58.02 LBS
26317.3 g / 258.2 N
critical level
5 mm 2496 Gs
249.6 mT
19.97 kg / 44.02 LBS
19965.4 g / 195.9 N
critical level
10 mm 1702 Gs
170.2 mT
9.28 kg / 20.45 LBS
9278.2 g / 91.0 N
strong
15 mm 1151 Gs
115.1 mT
4.25 kg / 9.36 LBS
4246.0 g / 41.7 N
strong
20 mm 792 Gs
79.2 mT
2.01 kg / 4.44 LBS
2012.1 g / 19.7 N
strong
30 mm 404 Gs
40.4 mT
0.52 kg / 1.15 LBS
523.0 g / 5.1 N
safe
50 mm 137 Gs
13.7 mT
0.06 kg / 0.13 LBS
60.1 g / 0.6 N
safe

Table 2: Shear load (vertical surface)
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) - vertical pull
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: Material efficiency (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 (stability) - thermal limit
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) - field collision
MPL 50x25x12 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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
Mechanical watch 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 (kinetic energy) - 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: Surface protection spec
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: Electrical 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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

*Caution: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly reduces 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) = 0.40

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.

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%
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: 020343-2026
Quick Unit Converter
Magnet pull force

Magnetic Field

See also products

Component MPL 50x25x12 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 364.18 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 strong flat 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 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. Thanks to the flat surface and high force (approx. 37.12 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.
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 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.
The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 25 mm (width), and 12 mm (thickness). The key parameter here is the holding force amounting to approximately 37.12 kg (force ~364.18 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over around 10 years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets are exceptionally resistant to demagnetization caused by external interference,
  • Thanks to the shimmering finish, the surface of nickel, gold-plated, or silver-plated gives an elegant appearance,
  • Magnetic induction on the top side of the magnet is strong,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Due to the potential of flexible molding and adaptation to unique needs, neodymium magnets can be created in a variety of geometric configurations, which increases their versatility,
  • Fundamental importance in electronics industry – they are commonly used in data components, electric drive systems, precision medical tools, as well as other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Weaknesses

What to avoid - cons of neodymium magnets: application proposals
  • At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength 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 stable to moisture, when using outdoors
  • Due to limitations in producing threads and complex forms in magnets, we recommend using a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Maximum holding power of the magnet – what contributes to it?

The force parameter is a theoretical maximum value performed under the following configuration:
  • on a plate made of mild steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an ground touching surface
  • without the slightest air gap between the magnet and steel
  • under axial force direction (90-degree angle)
  • at temperature room level

What influences lifting capacity in practice

Please note that the magnet holding will differ influenced by the following factors, in order of importance:
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted to the other side.
  • Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
  • Surface structure – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was measured with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.

Warnings
Health Danger

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Handling rules

Exercise caution. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can react.

Risk of cracking

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

Threat to electronics

Avoid bringing magnets near a wallet, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Pinching danger

Protect your hands. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!

Phone sensors

GPS units and mobile phones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Adults only

NdFeB magnets are not toys. Accidental ingestion of a few magnets may result in them pinching intestinal walls, which constitutes a critical condition and requires urgent medical intervention.

Allergy Warning

It is widely known that nickel (the usual finish) is a common allergen. If your skin reacts to metals, prevent direct skin contact and choose encased magnets.

Do not overheat magnets

Monitor thermal conditions. Exposing the magnet to high heat will ruin its properties and pulling force.

Flammability

Powder generated during machining of magnets is combustible. Do not drill into magnets unless you are an expert.

Security! More info about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98