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MPL 12x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020118

GTIN/EAN: 5906301811244

5.00

length

12 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

3.6 g

Magnetization Direction

↑ axial

Load capacity

3.45 kg / 33.88 N

Magnetic Induction

340.59 mT / 3406 Gs

Coating

[NiCuNi] Nickel

product specifications »

1.697 ZŁ with VAT / pcs + price for transport

1.380 ZŁ net + 23% VAT / pcs

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Product card - MPL 12x10x4 / N38 - lamellar magnet

Specification / characteristics - MPL 12x10x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020118
GTIN/EAN 5906301811244
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 12 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 3.6 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.45 kg / 33.88 N
Magnetic Induction ~ ? 340.59 mT / 3406 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 12x10x4 / 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 product - data

The following data are the outcome of a physical calculation. Values are based on models for the class Nd2Fe14B. Actual conditions may differ. Please consider these data as a reference point for designers.

Table 1: Static pull force (force vs gap) - power drop
MPL 12x10x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3404 Gs
340.4 mT
 3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
 warning
1 mm 2920 Gs
292.0 mT
 2.54 kg / 5.60 lbs
2538.8 g / 24.9 N
 warning
2 mm 2399 Gs
239.9 mT
 1.71 kg / 3.78 lbs
1713.7 g / 16.8 N
 weak grip
3 mm 1919 Gs
191.9 mT
 1.10 kg / 2.42 lbs
1096.3 g / 10.8 N
 weak grip
5 mm 1190 Gs
119.0 mT
 0.42 kg / 0.93 lbs
421.6 g / 4.1 N
 weak grip
10 mm 392 Gs
39.2 mT
 0.05 kg / 0.10 lbs
45.7 g / 0.4 N
 weak grip
15 mm 162 Gs
16.2 mT
 0.01 kg / 0.02 lbs
7.8 g / 0.1 N
 weak grip
20 mm 80 Gs
8.0 mT
 0.00 kg / 0.00 lbs
1.9 g / 0.0 N
 weak grip
30 mm 27 Gs
2.7 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 weak grip
50 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Pulling power weakens drastically with every mm of spacing. Remember that every additional insulation layer (e.g., contamination, paint, rust) noticeably reduces the pull force. Magnetic products operate most effectively in perfect adhesion; air break drastically cuts the force. See how rapidly the load capacity drop, when the product does not adhere flatly to the steel surface. When planning the mounting, discard unnecessary gaps.

Table 2: Shear hold (vertical surface)
MPL 12x10x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.69 kg / 1.52 lbs
690.0 g / 6.8 N
1 mm Stal (~0.2) 0.51 kg / 1.12 lbs
508.0 g / 5.0 N
2 mm Stal (~0.2) 0.34 kg / 0.75 lbs
342.0 g / 3.4 N
3 mm Stal (~0.2) 0.22 kg / 0.49 lbs
220.0 g / 2.2 N
5 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
10 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below presents the approximate weight limit necessary to start the shifting of the magnet vertically on a vertical steel wall (assuming standard friction coefficient). This parameter varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 12x10x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.04 kg / 2.28 lbs
1035.0 g / 10.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.69 kg / 1.52 lbs
690.0 g / 6.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.35 kg / 0.76 lbs
345.0 g / 3.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.73 kg / 3.80 lbs
1725.0 g / 16.9 N
When hanging a holder on a upright surface (e.g., a car body), it you can count on barely about 20%-30% of its maximum pull force. Gravity and a weak degree of grip cause that magnets move down easier than they pop off the substrate. Planning a wall mount? Remember that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a noticeably lighter load. Application of an anti-slip pad can significantly raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 12x10x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.35 kg / 0.76 lbs
345.0 g / 3.4 N
1 mm
25%
 0.86 kg / 1.90 lbs
862.5 g / 8.5 N
2 mm
50%
 1.73 kg / 3.80 lbs
1725.0 g / 16.9 N
3 mm
75%
 2.59 kg / 5.70 lbs
2587.5 g / 25.4 N
5 mm
100%
 3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
10 mm
100%
 3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
11 mm
100%
 3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
12 mm
100%
 3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
A thin metal plate cannot take in the entire magnetic field, which squanders power of the magnet. Should you attach a powerful product to a weak sheet, the magnetism will pass right through and the attraction force will be weaker. To achieve full efficiency of this magnet's power, you require a sufficiently solid backing of steel. The material oversaturation causes that on thin elements (e.g., thin profiles), the holder shows lower pull force. We advise picking the steel cross-section from these parameters.

Table 5: Working in heat (stability) - resistance threshold
MPL 12x10x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
 OK
40 °C -2.2% 3.37 kg / 7.44 lbs
3374.1 g / 33.1 N
 OK
60 °C -4.4% 3.30 kg / 7.27 lbs
3298.2 g / 32.4 N
80 °C -6.6% 3.22 kg / 7.10 lbs
3222.3 g / 31.6 N
100 °C -28.8% 2.46 kg / 5.42 lbs
2456.4 g / 24.1 N
Classic neodymiums irreversibly lose strength past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly demagnetize this product. With increasing heat, the magnet's force temporarily lowers. Avoid using this magnet in hot environments higher than its operating temperature limit. Too high temperature will result in permanent loss of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 12x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.57 kg / 18.90 lbs
4 915 Gs
1.29 kg / 2.84 lbs
1286 g / 12.6 N
 N/A
1 mm 7.46 kg / 16.44 lbs
6 349 Gs
1.12 kg / 2.47 lbs
1118 g / 11.0 N
 6.71 kg / 14.79 lbs
~0 Gs
2 mm 6.31 kg / 13.91 lbs
5 841 Gs
0.95 kg / 2.09 lbs
946 g / 9.3 N
 5.68 kg / 12.52 lbs
~0 Gs
3 mm 5.23 kg / 11.53 lbs
5 317 Gs
0.78 kg / 1.73 lbs
784 g / 7.7 N
 4.71 kg / 10.37 lbs
~0 Gs
5 mm 3.42 kg / 7.55 lbs
4 302 Gs
0.51 kg / 1.13 lbs
513 g / 5.0 N
 3.08 kg / 6.79 lbs
~0 Gs
10 mm 1.05 kg / 2.31 lbs
2 380 Gs
0.16 kg / 0.35 lbs
157 g / 1.5 N
 0.94 kg / 2.08 lbs
~0 Gs
20 mm 0.11 kg / 0.25 lbs
784 Gs
0.02 kg / 0.04 lbs
17 g / 0.2 N
 0.10 kg / 0.23 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
90 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
55 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
36 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
25 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
18 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
13 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a significantly greater distance than a neodymium and metal combination. The setup of two magnets generates a stronger field and a larger range of action. Want to build a strong closure? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the impact force is extreme. The levitation is a bit weaker than the connection force, but still significant.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Important: Estimates demonstrate shear force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 12x10x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Mobile device 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field is a serious hazard to IT equipment as well as pacemakers. These magnets produce a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field acts through matter and plastic. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MPL 12x10x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 31.48 km/h
(8.74 m/s)
 0.14 J
30 mm 54.08 km/h
(15.02 m/s)
 0.41 J
50 mm 69.81 km/h
(19.39 m/s)
 0.68 J
100 mm 98.73 km/h
(27.42 m/s)
 1.35 J
Neodymium magnets are very brittle – a strong collision with metal can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Striking energy can cause material chips or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Surface protection spec
MPL 12x10x4 / 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 12x10x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 295 Mx 42.9 µWb
Pc Coefficient 0.43 Low (Flat)
Total magnetic flux emitted by the pole surface. Essential parameter when building generators as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MPL 12x10x4 / N38

Environment Effective steel pull Effect
Air (land) 3.45 kg Standard
Water (riverbed) 3.95 kg
(+0.50 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Warning: On a vertical surface, the magnet retains merely a fraction of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

*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) = 0.43

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%
Environmental data
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: 020118-2026
Measurement Calculator
Pulling force
Magnetic Field
Input data in a box, to see the remaining units convert automatically.

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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 12x10x4 mm and a weight of 3.6 g, guarantees the highest quality connection. As a block magnet with high power (approx. 3.45 kg), this product is available off-the-shelf from our warehouse in Poland. 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. To separate the MPL 12x10x4 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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. 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. In practice, this means that this magnet has the greatest attraction force on its main planes (12x10 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.
This model is characterized by dimensions 12x10x4 mm, which, at a weight of 3.6 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 12x10x4 mm and a self-weight of 3.6 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of neodymium magnets.

Pros

Besides their exceptional strength, neodymium magnets offer 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 due to external magnetic sources,
  • Thanks to the shimmering finish, the surface of nickel, gold, or silver gives an clean appearance,
  • Magnets exhibit extremely high magnetic induction on the working surface,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Due to the ability of precise forming and customization to custom solutions, magnetic components can be produced in a wide range of geometric configurations, which amplifies use scope,
  • Significant place in high-tech industry – they are utilized in computer drives, motor assemblies, advanced medical instruments, also industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • 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, in case of application outdoors
  • We suggest cover - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex forms.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Holding force characteristics

Maximum holding power of the magnet – what affects it?

Breakaway force is the result of a measurement for ideal contact conditions, assuming:
  • with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
  • with a thickness minimum 10 mm
  • with a surface perfectly flat
  • without any air gap between the magnet and steel
  • during detachment in a direction vertical to the mounting surface
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

In practice, the actual lifting capacity is determined by several key aspects, listed from crucial:
  • Distance – existence of foreign body (paint, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was determined with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate lowers the load capacity.

H&S for magnets
Allergy Warning

A percentage of the population experience a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Frequent touching can result in an allergic reaction. We suggest wear protective gloves.

Magnetic media

Avoid bringing magnets close to a purse, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Mechanical processing

Powder created during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Conscious usage

Handle with care. Rare earth magnets act from a long distance and connect with massive power, often faster than you can move away.

Serious injuries

Risk of injury: The pulling power is so immense that it can result in blood blisters, pinching, and even bone fractures. Use thick gloves.

Do not overheat magnets

Control the heat. Heating the magnet to high heat will ruin its magnetic structure and pulling force.

Medical implants

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Keep away from children

These products are not intended for children. Accidental ingestion of multiple magnets may result in them pinching intestinal walls, which poses a severe health hazard and requires immediate surgery.

Beware of splinters

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Impact on smartphones

Navigation devices and smartphones are highly sensitive to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Attention! Looking for details? Check our post: Are neodymium magnets dangerous?