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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

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45.51 ZŁ with VAT / pcs + price for transport

37.00 ZŁ net + 23% VAT / pcs

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Physical properties - 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 modeling of the magnet - technical parameters

The following values represent the outcome of a engineering analysis. Values rely on algorithms for the class Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Treat these calculations as a reference point for designers.

Table 1: Static force (pull 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
 crushing
1 mm 3234 Gs
323.4 mT
 33.50 kg / 73.86 LBS
33501.5 g / 328.6 N
 crushing
2 mm 3052 Gs
305.2 mT
 29.85 kg / 65.80 LBS
29847.1 g / 292.8 N
 crushing
3 mm 2866 Gs
286.6 mT
 26.32 kg / 58.02 LBS
26317.3 g / 258.2 N
 crushing
5 mm 2496 Gs
249.6 mT
 19.97 kg / 44.02 LBS
19965.4 g / 195.9 N
 crushing
10 mm 1702 Gs
170.2 mT
 9.28 kg / 20.45 LBS
9278.2 g / 91.0 N
 warning
15 mm 1151 Gs
115.1 mT
 4.25 kg / 9.36 LBS
4246.0 g / 41.7 N
 warning
20 mm 792 Gs
79.2 mT
 2.01 kg / 4.44 LBS
2012.1 g / 19.7 N
 warning
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
Magnetic force drops sharply per each millimeter of distance. Remember that even a very thin break (e.g., dirt, paint, veneer) strongly reduces the pull force. Neodymiums hold most effectively in perfect adhesion; gap kills the force. Notice how rapidly the parameters plummet, when the magnet does not adhere tightly to the metal substrate. When designing the arrangement, eliminate additional spacers.

Table 2: Shear force (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
The table below calculates the approximate force sufficient to cause the shifting of the magnet down against a upright steel wall (assuming typical friction). This parameter is a function of the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - 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
When placing a holder on a upright plane (e.g., a board), it you can count on barely approx. 20%-30% of its maximum pull force. Gravity and a low friction coefficient influence the fact that products move down faster than they pull off. Planning a hanger? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the element will slip down under a much lighter weight. Application of an anti-slip coating can effectively raise the stability.

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
A thin sheet is incapable of focus the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To squeeze 100% of this magnet's potential, you require a sufficiently solid backing of metal. The saturation effect means that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We suggest choosing the steel cross-section from these parameters.

Table 5: Working in heat (stability) - power drop
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
Standard neodymium magnets irreversibly lose strength past the thermal threshold. Avoid high temperatures – heat can permanently damage this product. With increasing heat, the neodymium's force temporarily decreases. Refrain from using this magnet near heat sources exceeding its working range. Ignoring the limit will cause destruction of magnetism.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field collision
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
Two magnetic products interact from a much further distance than a magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Designing a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the pinch force is huge. The levitation is marginally weaker than the attraction, but still large.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Attention: Results show shear force of dual matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - 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
Mobile device 40 Gs (4.0 mT) 8.5 cm
Car key 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
Powerful magnet radiation is a real danger to electronic devices and medical implants. These magnets produce a field that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and plastic. Special caution must be exercised by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (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
Magnetic elements are delicate – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Impact energy can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the magnet. Wear eye protection when playing with large magnets.

Table 9: Corrosion resistance
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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MPL 50x25x12 / N38

Parameter Value SI Unit / Description
Magnetic Flux 42 945 Mx 429.5 µWb
Pc Coefficient 0.40 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains merely a fraction of its max power.

2. Steel thickness impact

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

3. Heat tolerance

*For standard magnets, the safety 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
Chemical composition
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
Force (pull)
Magnetic Field
Input a number in one of the inputs, and the remaining fields convert in real-time.

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Component MPL 50x25x12 / N38 features a flat shape and industrial pulling force, making it an ideal 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. Additionally, 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. To separate the MPL 50x25x12 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. 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. 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. 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), 25 mm (width), and 12 mm (thickness). 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 and cons of Nd2Fe14B magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
  • They are noted for resistance to demagnetization induced by external field influence,
  • By using a shiny layer of silver, the element acquires an nice look,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
  • Thanks to freedom in forming and the ability to customize to unusual requirements,
  • Fundamental importance in advanced technology sectors – they serve a role in HDD drives, electric drive systems, medical equipment, and complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in small systems

Cons

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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 resistant to moisture, when using outdoors
  • Due to limitations in creating threads and complicated shapes in magnets, we recommend using casing - magnetic mount.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • With large orders the cost of neodymium magnets is a challenge,

Lifting parameters

Best holding force of the magnet in ideal parameters – what affects it?

The specified lifting capacity concerns the maximum value, obtained under optimal environment, specifically:
  • on a block made of structural steel, optimally conducting the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • characterized by smoothness
  • with direct contact (no paint)
  • during pulling in a direction perpendicular to the mounting surface
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Please note that the magnet holding may be lower subject to elements below, starting with the most relevant:
  • Gap (betwixt the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
  • Direction of force – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be escaped to the other side.
  • Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.

Safety rules for work with neodymium magnets
Operating temperature

Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its properties and strength.

Bone fractures

Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Mechanical processing

Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.

Beware of splinters

Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Safe operation

Handle magnets consciously. Their immense force can surprise even experienced users. Stay alert and respect their force.

Medical implants

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

Phone sensors

An intense magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Keep magnets near a device to prevent damaging the sensors.

Electronic hazard

Very strong magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction appears, cease handling magnets and wear gloves.

Do not give to children

Strictly keep magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are very dangerous.

Important! Want to know more? Check our post: Why are neodymium magnets dangerous?