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

lamellar magnet

Catalog no 020159

GTIN/EAN: 5906301811657

5.00
Load capacity 7.52 kg / 73.80 N Magnetic Induction 168.28 mT / 1683 Gs
length
40 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
24 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Guides from the knowledge base

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Product card - 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 constitute the result of a physical simulation. Values are based on algorithms for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs distance) - power drop
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 pounds
7520.0 g / 73.8 N
 strong
1 mm 1613 Gs
161.3 mT
 6.91 kg / 15.24 pounds
6913.8 g / 67.8 N
 strong
2 mm 1524 Gs
152.4 mT
 6.17 kg / 13.61 pounds
6172.9 g / 60.6 N
 strong
3 mm 1423 Gs
142.3 mT
 5.38 kg / 11.86 pounds
5379.4 g / 52.8 N
 strong
5 mm 1207 Gs
120.7 mT
 3.87 kg / 8.53 pounds
3869.8 g / 38.0 N
 strong
10 mm 744 Gs
74.4 mT
 1.47 kg / 3.24 pounds
1469.3 g / 14.4 N
 weak grip
15 mm 455 Gs
45.5 mT
 0.55 kg / 1.21 pounds
550.7 g / 5.4 N
 weak grip
20 mm 288 Gs
28.8 mT
 0.22 kg / 0.49 pounds
220.3 g / 2.2 N
 weak grip
30 mm 129 Gs
12.9 mT
 0.04 kg / 0.10 pounds
44.4 g / 0.4 N
 weak grip
50 mm 38 Gs
3.8 mT
 0.00 kg / 0.01 pounds
3.8 g / 0.0 N
 weak grip
Magnetic force decreases drastically with every subsequent millimeter of distance. Remember that even a very thin break (e.g., contamination, paint, rust) significantly weakens the grip. Magnets operate strongest in perfect adhesion; distance nullifies the power. See how rapidly the load capacity drop, when the magnet does not touch directly to the steel surface. When calculating the mounting, avoid unnecessary gaps.

Table 2: Sliding hold (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 pounds
1504.0 g / 14.8 N
1 mm Stal (~0.2) 1.38 kg / 3.05 pounds
1382.0 g / 13.6 N
2 mm Stal (~0.2) 1.23 kg / 2.72 pounds
1234.0 g / 12.1 N
3 mm Stal (~0.2) 1.08 kg / 2.37 pounds
1076.0 g / 10.6 N
5 mm Stal (~0.2) 0.77 kg / 1.71 pounds
774.0 g / 7.6 N
10 mm Stal (~0.2) 0.29 kg / 0.65 pounds
294.0 g / 2.9 N
15 mm Stal (~0.2) 0.11 kg / 0.24 pounds
110.0 g / 1.1 N
20 mm Stal (~0.2) 0.04 kg / 0.10 pounds
44.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below presents the approximate force required to start the slippage of the magnet down along a upright metal surface (considering standard friction coefficient). The holding force varies with the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
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 pounds
2256.0 g / 22.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.50 kg / 3.32 pounds
1504.0 g / 14.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.75 kg / 1.66 pounds
752.0 g / 7.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.76 kg / 8.29 pounds
3760.0 g / 36.9 N
When hanging a magnet on a upright surface (e.g., a car body), it will maintain barely about 1/5 of its nominal power. Gravitational force as well as a low friction coefficient cause that products slide down faster than they pull off. Want to create a hanger? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will slip down under a significantly smaller cargo. Using a rubber pad can effectively increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
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 pounds
752.0 g / 7.4 N
1 mm
25%
 1.88 kg / 4.14 pounds
1880.0 g / 18.4 N
2 mm
50%
 3.76 kg / 8.29 pounds
3760.0 g / 36.9 N
3 mm
75%
 5.64 kg / 12.43 pounds
5640.0 g / 55.3 N
5 mm
100%
 7.52 kg / 16.58 pounds
7520.0 g / 73.8 N
10 mm
100%
 7.52 kg / 16.58 pounds
7520.0 g / 73.8 N
11 mm
100%
 7.52 kg / 16.58 pounds
7520.0 g / 73.8 N
12 mm
100%
 7.52 kg / 16.58 pounds
7520.0 g / 73.8 N
A too thin steel is incapable of take in the entire magnetic field, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the magnetism will penetrate right through and the attraction force will be weaker. To utilize the maximum of this magnet's potential, you need a suitably thick backing of steel. The material oversaturation means that on sheet metal structures (e.g., appliance housings), the product works worse. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal stability (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 pounds
7520.0 g / 73.8 N
 OK
40 °C -2.2% 7.35 kg / 16.21 pounds
7354.6 g / 72.1 N
 OK
60 °C -4.4% 7.19 kg / 15.85 pounds
7189.1 g / 70.5 N
80 °C -6.6% 7.02 kg / 15.48 pounds
7023.7 g / 68.9 N
100 °C -28.8% 5.35 kg / 11.80 pounds
5354.2 g / 52.5 N
Ordinary NdFeB products irreversibly lose strength after exceeding the maximum temperature. Protect against heat – high temperature can permanently destroy this magnet. As the temperature rises, the neodymium's capacity momentarily drops. Avoid using this magnet near heat sources exceeding its working range. Exceeding the critical threshold will cause permanent loss of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MPL 40x20x4x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.96 kg / 30.78 pounds
2 997 Gs
2.09 kg / 4.62 pounds
2094 g / 20.5 N
 N/A
1 mm 13.44 kg / 29.64 pounds
3 302 Gs
2.02 kg / 4.45 pounds
2017 g / 19.8 N
 12.10 kg / 26.68 pounds
~0 Gs
2 mm 12.84 kg / 28.30 pounds
3 227 Gs
1.93 kg / 4.25 pounds
1926 g / 18.9 N
 11.55 kg / 25.47 pounds
~0 Gs
3 mm 12.17 kg / 26.83 pounds
3 142 Gs
1.83 kg / 4.02 pounds
1826 g / 17.9 N
 10.95 kg / 24.15 pounds
~0 Gs
5 mm 10.73 kg / 23.65 pounds
2 950 Gs
1.61 kg / 3.55 pounds
1609 g / 15.8 N
 9.66 kg / 21.29 pounds
~0 Gs
10 mm 7.19 kg / 15.84 pounds
2 414 Gs
1.08 kg / 2.38 pounds
1078 g / 10.6 N
 6.47 kg / 14.26 pounds
~0 Gs
20 mm 2.73 kg / 6.01 pounds
1 487 Gs
0.41 kg / 0.90 pounds
409 g / 4.0 N
 2.46 kg / 5.41 pounds
~0 Gs
50 mm 0.18 kg / 0.39 pounds
379 Gs
0.03 kg / 0.06 pounds
27 g / 0.3 N
 0.16 kg / 0.35 pounds
~0 Gs
60 mm 0.08 kg / 0.18 pounds
259 Gs
0.01 kg / 0.03 pounds
12 g / 0.1 N
 0.07 kg / 0.16 pounds
~0 Gs
70 mm 0.04 kg / 0.09 pounds
183 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
80 mm 0.02 kg / 0.05 pounds
133 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
90 mm 0.01 kg / 0.03 pounds
99 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
76 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a wider radius than a neodymium and metal setup. The setup of two magnets produces a massive flux and a wider radius of performance. Planning to create a strong closure? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The repulsion force is a bit weaker than the connection force, but still large.
*Field value between like poles reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
* Results demonstrate shear force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - 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
Timepiece 20 Gs (2.0 mT) 6.5 cm
Mobile device 40 Gs (4.0 mT) 5.0 cm
Car key 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 IT equipment as well as medical implants. These NdFeB products produce a flux that destroys function of sensitive medical devices. Remember: the unseen radiation passes through tissues and housings. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.94 km/h
(5.82 m/s)
 0.41 J
30 mm 22.76 km/h
(6.32 m/s)
 0.48 J
50 mm 22.83 km/h
(6.34 m/s)
 0.48 J
100 mm 22.85 km/h
(6.35 m/s)
 0.48 J
Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can cause material chips or injury to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Coating parameters (durability)
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
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)
Flux value passing through the pole surface. Key data for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.

1. Shear force

*Note: On a vertical wall, the magnet retains just approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Heat tolerance

*For N38 grade, the safety limit is 80°C.

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

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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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%

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: 020159-2026
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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. Additionally, its Ni-Cu-Ni coating secures 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. Watch your fingers! Magnets with a force of 7.52 kg can pinch very hard and cause hematomas. 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 fasteners 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.
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 (40x20 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: 40 mm (length), 20 mm (width), and 4 mm (thickness). The key parameter here is the holding force amounting to approximately 7.52 kg (force ~73.80 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of rare earth magnets.

Advantages

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • Their power is maintained, and after approximately ten years it drops only by ~1% (according to research),
  • Magnets very well resist against demagnetization caused by external fields,
  • By using a lustrous coating of silver, the element acquires an modern look,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Due to the possibility of flexible forming and customization to unique needs, magnetic components can be manufactured in a wide range of geometric configurations, which makes them more universal,
  • Huge importance in advanced technology sectors – they are commonly used in mass storage devices, electromotive mechanisms, diagnostic systems, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We recommend casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets can be problematic in diagnostics medical when they are in the body.
  • Due to complex production process, their price is higher than average,

Holding force characteristics

Maximum holding power of the magnet – what affects it?

Breakaway force was determined for the most favorable conditions, assuming:
  • on a block made of structural steel, optimally conducting the magnetic field
  • whose thickness is min. 10 mm
  • characterized by smoothness
  • under conditions of gap-free contact (surface-to-surface)
  • for force acting at a right angle (in the magnet axis)
  • at standard ambient temperature

What influences lifting capacity in practice

In practice, the actual lifting capacity results from several key aspects, presented from crucial:
  • Clearance – the presence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Cast iron may attract less.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Product not for children

Absolutely store magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are life-threatening.

Dust is flammable

Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.

Maximum temperature

Do not overheat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Conscious usage

Use magnets with awareness. Their immense force can shock even experienced users. Plan your moves and do not underestimate their power.

Safe distance

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

Material brittleness

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Impact of two magnets leads to them shattering into small pieces.

Precision electronics

A strong magnetic field disrupts the operation of compasses in phones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.

Allergy Warning

Studies show that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent touching magnets with bare hands and opt for versions in plastic housing.

Medical interference

Patients with a heart stimulator must keep an safe separation from magnets. The magnetic field can interfere with the operation of the implant.

Crushing risk

Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Attention! Learn more about hazards in the article: Safety of working with magnets.