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MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020159

GTIN/EAN: 5906301811657

5.00

length

40 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

24 g

Magnetization Direction

↑ axial

Load capacity

7.52 kg / 73.80 N

Magnetic Induction

168.28 mT / 1683 Gs

Coating

[NiCuNi] Nickel

technical specifications »

17.96 ZŁ with VAT / pcs + price for transport

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Technical data of the product - MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020159
GTIN/EAN 5906301811657
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 40 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 24 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.52 kg / 73.80 N
Magnetic Induction ~ ? 168.28 mT / 1683 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x20x4x2[7/3.5] / 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 analysis of the product - data

The following data represent the result of a physical calculation. Results rely on models for the class Nd2Fe14B. Actual conditions may deviate from the simulation results. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
MPL 40x20x4x2[7/3.5] / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1683 Gs
168.3 mT
 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
 warning
1 mm 1613 Gs
161.3 mT
 6.91 kg / 15.24 LBS
6913.8 g / 67.8 N
 warning
2 mm 1524 Gs
152.4 mT
 6.17 kg / 13.61 LBS
6172.9 g / 60.6 N
 warning
3 mm 1423 Gs
142.3 mT
 5.38 kg / 11.86 LBS
5379.4 g / 52.8 N
 warning
5 mm 1207 Gs
120.7 mT
 3.87 kg / 8.53 LBS
3869.8 g / 38.0 N
 warning
10 mm 744 Gs
74.4 mT
 1.47 kg / 3.24 LBS
1469.3 g / 14.4 N
 weak grip
15 mm 455 Gs
45.5 mT
 0.55 kg / 1.21 LBS
550.7 g / 5.4 N
 weak grip
20 mm 288 Gs
28.8 mT
 0.22 kg / 0.49 LBS
220.3 g / 2.2 N
 weak grip
30 mm 129 Gs
12.9 mT
 0.04 kg / 0.10 LBS
44.4 g / 0.4 N
 weak grip
50 mm 38 Gs
3.8 mT
 0.00 kg / 0.01 LBS
3.8 g / 0.0 N
 weak grip
Grip strength weakens drastically with every subsequent millimeter of gap. Keep in mind that every additional insulation layer (e.g., contamination, varnish, veneer) strongly diminishes the holding power. Magnetic products hold most effectively during direct contact; distance nullifies the force. See how rapidly the load capacity fall, when the magnet does not touch tightly to the steel surface. When calculating the mounting, eliminate unnecessary gaps.

Table 2: Vertical capacity (wall)
MPL 40x20x4x2[7/3.5] / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.50 kg / 3.32 LBS
1504.0 g / 14.8 N
1 mm Stal (~0.2) 1.38 kg / 3.05 LBS
1382.0 g / 13.6 N
2 mm Stal (~0.2) 1.23 kg / 2.72 LBS
1234.0 g / 12.1 N
3 mm Stal (~0.2) 1.08 kg / 2.37 LBS
1076.0 g / 10.6 N
5 mm Stal (~0.2) 0.77 kg / 1.71 LBS
774.0 g / 7.6 N
10 mm Stal (~0.2) 0.29 kg / 0.65 LBS
294.0 g / 2.9 N
15 mm Stal (~0.2) 0.11 kg / 0.24 LBS
110.0 g / 1.1 N
20 mm Stal (~0.2) 0.04 kg / 0.10 LBS
44.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below presents the approximate shear load required to start the slippage of the magnet downwards against a upright steel plate (assuming standard friction). The holding force varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 40x20x4x2[7/3.5] / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.26 kg / 4.97 LBS
2256.0 g / 22.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.50 kg / 3.32 LBS
1504.0 g / 14.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.75 kg / 1.66 LBS
752.0 g / 7.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.76 kg / 8.29 LBS
3760.0 g / 36.9 N
When placing a magnet on a vertical wall (e.g., a car body), it will only hold barely about 1/5 of its maximum pull force. Gravitational force and a weak degree of grip influence the fact that products slide down easier than they pop off the substrate. Planning a vertical fastening? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a much lighter cargo. Application of an anti-slip layer can significantly improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MPL 40x20x4x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.75 kg / 1.66 LBS
752.0 g / 7.4 N
1 mm
25%
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
2 mm
50%
 3.76 kg / 8.29 LBS
3760.0 g / 36.9 N
3 mm
75%
 5.64 kg / 12.43 LBS
5640.0 g / 55.3 N
5 mm
100%
 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
10 mm
100%
 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
11 mm
100%
 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
12 mm
100%
 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
A thin sheet is incapable of focus the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid element of metal. The saturation phenomenon causes that on thin elements (e.g., car bodies), the magnet shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
MPL 40x20x4x2[7/3.5] / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
 OK
40 °C -2.2% 7.35 kg / 16.21 LBS
7354.6 g / 72.1 N
 OK
60 °C -4.4% 7.19 kg / 15.85 LBS
7189.1 g / 70.5 N
80 °C -6.6% 7.02 kg / 15.48 LBS
7023.7 g / 68.9 N
100 °C -28.8% 5.35 kg / 11.80 LBS
5354.2 g / 52.5 N
Ordinary NdFeB products lose strength above the temperature limit. Avoid high temperatures – high temperature can irreversibly destroy this magnet. With every degree above norm, the magnet's power momentarily lowers. Refrain from using this magnet close to ovens higher than its operating temperature limit. Too high temperature will result in permanent loss of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) risk losing magnetic properties under lower heat stress than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 40x20x4x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.96 kg / 30.78 LBS
2 997 Gs
2.09 kg / 4.62 LBS
2094 g / 20.5 N
 N/A
1 mm 13.44 kg / 29.64 LBS
3 302 Gs
2.02 kg / 4.45 LBS
2017 g / 19.8 N
 12.10 kg / 26.68 LBS
~0 Gs
2 mm 12.84 kg / 28.30 LBS
3 227 Gs
1.93 kg / 4.25 LBS
1926 g / 18.9 N
 11.55 kg / 25.47 LBS
~0 Gs
3 mm 12.17 kg / 26.83 LBS
3 142 Gs
1.83 kg / 4.02 LBS
1826 g / 17.9 N
 10.95 kg / 24.15 LBS
~0 Gs
5 mm 10.73 kg / 23.65 LBS
2 950 Gs
1.61 kg / 3.55 LBS
1609 g / 15.8 N
 9.66 kg / 21.29 LBS
~0 Gs
10 mm 7.19 kg / 15.84 LBS
2 414 Gs
1.08 kg / 2.38 LBS
1078 g / 10.6 N
 6.47 kg / 14.26 LBS
~0 Gs
20 mm 2.73 kg / 6.01 LBS
1 487 Gs
0.41 kg / 0.90 LBS
409 g / 4.0 N
 2.46 kg / 5.41 LBS
~0 Gs
50 mm 0.18 kg / 0.39 LBS
379 Gs
0.03 kg / 0.06 LBS
27 g / 0.3 N
 0.16 kg / 0.35 LBS
~0 Gs
60 mm 0.08 kg / 0.18 LBS
259 Gs
0.01 kg / 0.03 LBS
12 g / 0.1 N
 0.07 kg / 0.16 LBS
~0 Gs
70 mm 0.04 kg / 0.09 LBS
183 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.04 kg / 0.08 LBS
~0 Gs
80 mm 0.02 kg / 0.05 LBS
133 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
90 mm 0.01 kg / 0.03 LBS
99 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.02 LBS
~0 Gs
100 mm 0.01 kg / 0.02 LBS
76 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets interact from a much further distance than a neodymium and metal setup. The setup of two magnets produces a massive flux and a larger range of operation. Want to build a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the impact force is massive. The levitation is slightly lower than the connection force, but still significant.
*Field value between like poles is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Note: Calculations demonstrate sliding force of two matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - precautionary measures
MPL 40x20x4x2[7/3.5] / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Mechanical watch 20 Gs (2.0 mT) 6.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 cm
Remote 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field poses a large risk to electronics as well as medical implants. These neodymiums produce a field that prevents correct functioning of digital equipment. Remember: the unseen radiation penetrates the body and glass. Special caution must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MPL 40x20x4x2[7/3.5] / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.91 km/h
(5.53 m/s)
 0.37 J
30 mm 31.03 km/h
(8.62 m/s)
 0.89 J
50 mm 39.93 km/h
(11.09 m/s)
 1.48 J
100 mm 56.45 km/h
(15.68 m/s)
 2.95 J
NdFeB products are delicate – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Kinetic force can destroy the magnet or injury to skin. Always hold the magnet during installation so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when working with large magnets.

Table 9: Surface protection spec
MPL 40x20x4x2[7/3.5] / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MPL 40x20x4x2[7/3.5] / N38

Parameter Value SI Unit / Description
Magnetic Flux 15 299 Mx 153.0 µWb
Pc Coefficient 0.19 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data for generator designers and motors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 40x20x4x2[7/3.5] / N38

Environment Effective steel pull Effect
Air (land) 7.52 kg Standard
Water (riverbed) 8.61 kg
(+1.09 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
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. Vertical hold

*Warning: On a vertical surface, the magnet holds just a fraction of its max power.

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly limits the holding force.

3. Thermal stability

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.19

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%
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: 020159-2026
Measurement Calculator
Magnet pull force
Magnetic Induction
Insert your figure in any box, and all other values change automatically.

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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 40x20x4 mm and a weight of 24 g, guarantees the highest quality connection. This magnetic block with a force of 73.80 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating protects 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 40x20x4x2[7/3.5] / 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 generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for hanging tools 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x20x4x2[7/3.5] / N38 model is magnetized through the thickness (dimension 4 mm), which means that the N and S poles are located on its largest, flat surfaces. 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.
This model is characterized by dimensions 40x20x4 mm, which, at a weight of 24 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 40x20x4 mm and a self-weight of 24 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of Nd2Fe14B magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose strength, even over nearly 10 years – the drop in power is only ~1% (theoretically),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnets exhibit extremely high magnetic induction on the active area,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • In view of the potential of precise molding and adaptation to specialized requirements, magnetic components can be created in a broad palette of forms and dimensions, which amplifies use scope,
  • Significant place in electronics industry – they are utilized in HDD drives, electric drive systems, precision medical tools, and technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Cons of neodymium magnets: weaknesses and usage proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. 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 rust. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of creating threads in the magnet and complicated forms - recommended is a housing - mounting mechanism.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small components of these products can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum magnetic pulling force – what affects it?

Holding force of 7.52 kg is a measurement result executed under standard conditions:
  • using a sheet made of low-carbon steel, acting as a circuit closing element
  • with a cross-section minimum 10 mm
  • with a plane perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • under perpendicular application of breakaway force (90-degree angle)
  • at ambient temperature room level

Determinants of lifting force in real conditions

Effective lifting capacity is influenced by working environment parameters, mainly (from priority):
  • Distance (between the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the flux to be lost to the other side.
  • Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Electronic hazard

Data protection: Strong magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Fire risk

Dust created during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Sensitization to coating

Some people experience a contact allergy to nickel, which is the standard coating for neodymium magnets. Prolonged contact may cause an allergic reaction. We strongly advise use protective gloves.

Phone sensors

Note: neodymium magnets generate a field that confuses precision electronics. Keep a safe distance from your mobile, device, and GPS.

Eye protection

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Maximum temperature

Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

ICD Warning

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

Do not underestimate power

Handle with care. Neodymium magnets attract from a distance and connect with massive power, often faster than you can react.

Adults only

Adult use only. Small elements pose a choking risk, causing intestinal necrosis. Store away from kids and pets.

Pinching danger

Large magnets can smash fingers in a fraction of a second. Under no circumstances put your hand between two strong magnets.

Caution! Details about risks in the article: Safety of working with magnets.