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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

technical details »

159.90 ZŁ with VAT / pcs + price for transport

130.00 ZŁ net + 23% VAT / pcs

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Technical details - 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 simulation of the magnet - data

The following data represent the outcome of a physical calculation. Values are based on models for the material Nd2Fe14B. Actual performance may differ from theoretical values. Treat these calculations as a reference point during assembly planning.

Table 1: Static force (force 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 pounds
90530.0 g / 888.1 N
 crushing
1 mm 3999 Gs
399.9 mT
 84.79 kg / 186.94 pounds
84794.0 g / 831.8 N
 crushing
2 mm 3861 Gs
386.1 mT
 79.04 kg / 174.25 pounds
79038.6 g / 775.4 N
 crushing
3 mm 3720 Gs
372.0 mT
 73.38 kg / 161.78 pounds
73381.8 g / 719.9 N
 crushing
5 mm 3435 Gs
343.5 mT
 62.56 kg / 137.93 pounds
62564.2 g / 613.8 N
 crushing
10 mm 2742 Gs
274.2 mT
 39.87 kg / 87.90 pounds
39868.7 g / 391.1 N
 crushing
15 mm 2137 Gs
213.7 mT
 24.21 kg / 53.37 pounds
24210.4 g / 237.5 N
 crushing
20 mm 1649 Gs
164.9 mT
 14.41 kg / 31.77 pounds
14409.9 g / 141.4 N
 crushing
30 mm 988 Gs
98.8 mT
 5.17 kg / 11.40 pounds
5170.9 g / 50.7 N
 medium risk
50 mm 399 Gs
39.9 mT
 0.85 kg / 1.86 pounds
845.8 g / 8.3 N
 low risk
Pulling power decreases sharply with every mm of gap. Keep in mind that even the smallest gap (e.g., dirt, varnish, veneer) strongly reduces the pull force. Magnets operate optimally at the point of direct contact; distance weakens the power. Observe how rapidly the load capacity drop, when the product does not adhere tightly to the metal substrate. When designing the arrangement, eliminate additional spacers.

Table 2: Vertical 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 pounds
18106.0 g / 177.6 N
1 mm Stal (~0.2) 16.96 kg / 37.39 pounds
16958.0 g / 166.4 N
2 mm Stal (~0.2) 15.81 kg / 34.85 pounds
15808.0 g / 155.1 N
3 mm Stal (~0.2) 14.68 kg / 32.36 pounds
14676.0 g / 144.0 N
5 mm Stal (~0.2) 12.51 kg / 27.58 pounds
12512.0 g / 122.7 N
10 mm Stal (~0.2) 7.97 kg / 17.58 pounds
7974.0 g / 78.2 N
15 mm Stal (~0.2) 4.84 kg / 10.67 pounds
4842.0 g / 47.5 N
20 mm Stal (~0.2) 2.88 kg / 6.35 pounds
2882.0 g / 28.3 N
30 mm Stal (~0.2) 1.03 kg / 2.28 pounds
1034.0 g / 10.1 N
50 mm Stal (~0.2) 0.17 kg / 0.37 pounds
170.0 g / 1.7 N
This section indicates the theoretical holding capacity needed to cause the slippage of the magnet down on a upright metal surface (assuming standard friction). The holding force depends on the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 pounds
27159.0 g / 266.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
18.11 kg / 39.92 pounds
18106.0 g / 177.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
9.05 kg / 19.96 pounds
9053.0 g / 88.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
45.27 kg / 99.79 pounds
45265.0 g / 444.0 N
When mounting a magnet on a vertical surface (e.g., a fridge), it you can count on barely about 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient mean that holders move down easier than they detach. Designing a vertical fastening? Note that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will give way down under a noticeably lighter cargo. Using a rubber layer can significantly raise the stability.

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 pounds
3017.7 g / 29.6 N
1 mm
8%
 7.54 kg / 16.63 pounds
7544.2 g / 74.0 N
2 mm
17%
 15.09 kg / 33.26 pounds
15088.3 g / 148.0 N
3 mm
25%
 22.63 kg / 49.90 pounds
22632.5 g / 222.0 N
5 mm
42%
 37.72 kg / 83.16 pounds
37720.8 g / 370.0 N
10 mm
83%
 75.44 kg / 166.32 pounds
75441.7 g / 740.1 N
11 mm
92%
 82.99 kg / 182.95 pounds
82985.8 g / 814.1 N
12 mm
100%
 90.53 kg / 199.58 pounds
90530.0 g / 888.1 N
A too thin steel cannot conduct the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a thin surface, the flux will pass right through and the attraction force will be weaker. To utilize the maximum of this neodymium's potential, you require a sufficiently solid backing of steel. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the magnet works worse. We advise picking the steel cross-section according to the table below.

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 pounds
90530.0 g / 888.1 N
 OK
40 °C -2.2% 88.54 kg / 195.19 pounds
88538.3 g / 868.6 N
 OK
60 °C -4.4% 86.55 kg / 190.80 pounds
86546.7 g / 849.0 N
80 °C -6.6% 84.56 kg / 186.41 pounds
84555.0 g / 829.5 N
100 °C -28.8% 64.46 kg / 142.10 pounds
64457.4 g / 632.3 N
Classic neodymiums lose parameters past the thermal threshold. Watch out for overheating – excessive heat can irreversibly demagnetize this magnet. With every degree above norm, the magnet's capacity briefly lowers. Refrain from using this magnet in hot environments higher than its operating temperature limit. Ignoring the limit will cause destruction of magnetism.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) may lose charge permanently sooner compared to rod magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
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 pounds
5 403 Gs
39.47 kg / 87.02 pounds
39472 g / 387.2 N
 N/A
1 mm 254.89 kg / 561.94 pounds
8 133 Gs
38.23 kg / 84.29 pounds
38234 g / 375.1 N
 229.40 kg / 505.75 pounds
~0 Gs
2 mm 246.47 kg / 543.38 pounds
7 998 Gs
36.97 kg / 81.51 pounds
36971 g / 362.7 N
 221.83 kg / 489.04 pounds
~0 Gs
3 mm 238.08 kg / 524.88 pounds
7 861 Gs
35.71 kg / 78.73 pounds
35713 g / 350.3 N
 214.28 kg / 472.40 pounds
~0 Gs
5 mm 221.48 kg / 488.27 pounds
7 582 Gs
33.22 kg / 73.24 pounds
33222 g / 325.9 N
 199.33 kg / 439.45 pounds
~0 Gs
10 mm 181.86 kg / 400.93 pounds
6 870 Gs
27.28 kg / 60.14 pounds
27279 g / 267.6 N
 163.67 kg / 360.83 pounds
~0 Gs
20 mm 115.89 kg / 255.49 pounds
5 484 Gs
17.38 kg / 38.32 pounds
17383 g / 170.5 N
 104.30 kg / 229.94 pounds
~0 Gs
50 mm 24.93 kg / 54.97 pounds
2 544 Gs
3.74 kg / 8.25 pounds
3740 g / 36.7 N
 22.44 kg / 49.47 pounds
~0 Gs
60 mm 15.03 kg / 33.14 pounds
1 975 Gs
2.25 kg / 4.97 pounds
2255 g / 22.1 N
 13.53 kg / 29.82 pounds
~0 Gs
70 mm 9.24 kg / 20.37 pounds
1 548 Gs
1.39 kg / 3.05 pounds
1386 g / 13.6 N
 8.31 kg / 18.33 pounds
~0 Gs
80 mm 5.81 kg / 12.80 pounds
1 228 Gs
0.87 kg / 1.92 pounds
871 g / 8.5 N
 5.23 kg / 11.52 pounds
~0 Gs
90 mm 3.74 kg / 8.24 pounds
985 Gs
0.56 kg / 1.24 pounds
560 g / 5.5 N
 3.36 kg / 7.41 pounds
~0 Gs
100 mm 2.46 kg / 5.42 pounds
799 Gs
0.37 kg / 0.81 pounds
369 g / 3.6 N
 2.21 kg / 4.88 pounds
~0 Gs
Two magnetic products attract each other from a much further distance than a neodymium and metal combination. Such a system of two magnets creates a more powerful interaction and a wider radius of performance. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The levitation is slightly lower than the connection force, but still significant.
*The magnetic induction for N-N configuration drops to ~0 Gs at the midpoint between the magnets (due to field cancellation).
Note: Estimates show shear force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
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
A strong magnetic field is a large risk to electronic devices as well as pacemakers. These NdFeB products generate a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
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
Magnetic elements are prone to chipping – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or painful pinches to fingers. Be sure to control the product during mounting so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the neodymium. Wear safety glasses when handling with powerful specimens.

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)
The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Flux value emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
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!
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically reduces the holding force.

3. Heat tolerance

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.54

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 specification and ecology
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%
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: 020168-2026
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Component MPL 50x50x25 / N38 features a flat shape and industrial pulling force, making it a perfect 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 strong flat 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.
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. 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).
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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.
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 protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
  • They retain their magnetic properties even under strong external field,
  • A magnet with a smooth silver surface has better aesthetics,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Due to the potential of flexible molding and adaptation to unique solutions, NdFeB magnets can be created in a broad palette of forms and dimensions, which expands the range of possible applications,
  • Universal use in electronics industry – they are commonly used in mass storage devices, motor assemblies, medical equipment, and modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their power 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
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of creating threads in the magnet and complex forms - preferred is casing - magnet mounting.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small components of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:
  • on a block made of structural steel, effectively closing the magnetic flux
  • whose transverse dimension is min. 10 mm
  • with an ground contact surface
  • with total lack of distance (without impurities)
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

In practice, the actual lifting capacity depends on many variables, ranked from the most important:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Chemical composition of the base – mild steel gives the best results. Alloy admixtures decrease magnetic properties and holding force.
  • Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Impact on smartphones

A powerful magnetic field interferes with the functioning of compasses in smartphones and GPS navigation. Keep magnets close to a device to avoid damaging the sensors.

Electronic devices

Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of min. 10 cm.

ICD Warning

People with a heart stimulator have to maintain an absolute distance from magnets. The magnetism can disrupt the operation of the implant.

Heat sensitivity

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Do not give to children

Only for adults. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of children and animals.

Nickel coating and allergies

Some people have a contact allergy to nickel, which is the common plating for neodymium magnets. Prolonged contact can result in a rash. We recommend use safety gloves.

Dust is flammable

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Magnet fragility

Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Conscious usage

Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Serious injuries

Risk of injury: The attraction force is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Security! Need more info? Read our article: Are neodymium magnets dangerous?