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MPL 40x18x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020156

GTIN/EAN: 5906301811626

5.00

length

40 mm [±0,1 mm]

Width

18 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

54 g

Magnetization Direction

↑ axial

Load capacity

23.81 kg / 233.58 N

Magnetic Induction

366.66 mT / 3667 Gs

Coating

[NiCuNi] Nickel

see technical data »

30.75 ZŁ with VAT / pcs + price for transport

25.00 ZŁ net + 23% VAT / pcs

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Strength along with shape of neodymium magnets can be verified using our magnetic mass calculator.

Orders placed before 14:00 will be shipped the same business day.

Product card - MPL 40x18x10 / N38 - lamellar magnet

Specification / characteristics - MPL 40x18x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020156
GTIN/EAN 5906301811626
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 18 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 54 g
Magnetization Direction ↑ axial
Load capacity ~ ? 23.81 kg / 233.58 N
Magnetic Induction ~ ? 366.66 mT / 3667 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x18x10 / 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 - technical parameters

The following information represent the direct effect of a mathematical analysis. Values were calculated on algorithms for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Treat these data as a preliminary roadmap for designers.

Table 1: Static force (pull vs gap) - power drop
MPL 40x18x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3666 Gs
366.6 mT
 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
 dangerous!
1 mm 3399 Gs
339.9 mT
 20.48 kg / 45.14 pounds
20476.1 g / 200.9 N
 dangerous!
2 mm 3120 Gs
312.0 mT
 17.25 kg / 38.02 pounds
17245.9 g / 169.2 N
 dangerous!
3 mm 2841 Gs
284.1 mT
 14.30 kg / 31.54 pounds
14304.1 g / 140.3 N
 dangerous!
5 mm 2321 Gs
232.1 mT
 9.55 kg / 21.05 pounds
9547.8 g / 93.7 N
 strong
10 mm 1370 Gs
137.0 mT
 3.32 kg / 7.33 pounds
3324.4 g / 32.6 N
 strong
15 mm 833 Gs
83.3 mT
 1.23 kg / 2.71 pounds
1229.0 g / 12.1 N
 weak grip
20 mm 530 Gs
53.0 mT
 0.50 kg / 1.10 pounds
498.1 g / 4.9 N
 weak grip
30 mm 244 Gs
24.4 mT
 0.11 kg / 0.23 pounds
105.3 g / 1.0 N
 weak grip
50 mm 75 Gs
7.5 mT
 0.01 kg / 0.02 pounds
9.9 g / 0.1 N
 weak grip
Magnetic force drops significantly with every mm of distance. Keep in mind that even a microscopic distance (e.g., contamination, varnish, dust) significantly weakens the grip. Neodymiums operate most effectively in perfect adhesion; distance kills the force. Notice how flashily the load capacity drop, when the product does not adhere flatly to the metal substrate. When calculating the arrangement, avoid redundant distances.

Table 2: Vertical load (vertical surface)
MPL 40x18x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.76 kg / 10.50 pounds
4762.0 g / 46.7 N
1 mm Stal (~0.2) 4.10 kg / 9.03 pounds
4096.0 g / 40.2 N
2 mm Stal (~0.2) 3.45 kg / 7.61 pounds
3450.0 g / 33.8 N
3 mm Stal (~0.2) 2.86 kg / 6.31 pounds
2860.0 g / 28.1 N
5 mm Stal (~0.2) 1.91 kg / 4.21 pounds
1910.0 g / 18.7 N
10 mm Stal (~0.2) 0.66 kg / 1.46 pounds
664.0 g / 6.5 N
15 mm Stal (~0.2) 0.25 kg / 0.54 pounds
246.0 g / 2.4 N
20 mm Stal (~0.2) 0.10 kg / 0.22 pounds
100.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
The table below defines the estimated holding capacity needed to cause the downward movement of the magnet vertically on a upright steel plate (considering typical friction). This parameter varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MPL 40x18x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.14 kg / 15.75 pounds
7143.0 g / 70.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.76 kg / 10.50 pounds
4762.0 g / 46.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.38 kg / 5.25 pounds
2381.0 g / 23.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
11.91 kg / 26.25 pounds
11905.0 g / 116.8 N
When mounting a element on a upright plane (e.g., a fridge), it will maintain barely about 1/5 of nominal attraction strength. Gravity and a low friction coefficient cause that holders slip easier than they pull off. Want to create a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the holder will slide down under a significantly smaller cargo. Application of an anti-slip coating can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 40x18x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.19 kg / 2.62 pounds
1190.5 g / 11.7 N
1 mm
13%
 2.98 kg / 6.56 pounds
2976.3 g / 29.2 N
2 mm
25%
 5.95 kg / 13.12 pounds
5952.5 g / 58.4 N
3 mm
38%
 8.93 kg / 19.68 pounds
8928.7 g / 87.6 N
5 mm
63%
 14.88 kg / 32.81 pounds
14881.3 g / 146.0 N
10 mm
100%
 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
11 mm
100%
 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
12 mm
100%
 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
A thin metal plate is unable to absorb the entire magnetic field, which weakens actual performance of the magnet. Should you attach a powerful product to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you require a sufficiently solid piece of metal. The saturation effect means that on sheet metal structures (e.g., appliance housings), the magnet works worse. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal stability (stability) - power drop
MPL 40x18x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
 OK
40 °C -2.2% 23.29 kg / 51.34 pounds
23286.2 g / 228.4 N
 OK
60 °C -4.4% 22.76 kg / 50.18 pounds
22762.4 g / 223.3 N
80 °C -6.6% 22.24 kg / 49.03 pounds
22238.5 g / 218.2 N
100 °C -28.8% 16.95 kg / 37.37 pounds
16952.7 g / 166.3 N
Standard neodymium magnets irreversibly lose strength past the thermal threshold. Watch out for overheating – heat can permanently damage this magnet. As the temperature rises, the magnet's force momentarily decreases. Avoid using this product in hot environments higher than its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) are more susceptible to demagnetization sooner than taller cylinders. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
MPL 40x18x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 59.64 kg / 131.49 pounds
5 034 Gs
8.95 kg / 19.72 pounds
8947 g / 87.8 N
 N/A
1 mm 55.50 kg / 122.35 pounds
7 072 Gs
8.32 kg / 18.35 pounds
8325 g / 81.7 N
 49.95 kg / 110.12 pounds
~0 Gs
2 mm 51.29 kg / 113.08 pounds
6 799 Gs
7.69 kg / 16.96 pounds
7694 g / 75.5 N
 46.16 kg / 101.77 pounds
~0 Gs
3 mm 47.18 kg / 104.01 pounds
6 520 Gs
7.08 kg / 15.60 pounds
7076 g / 69.4 N
 42.46 kg / 93.61 pounds
~0 Gs
5 mm 39.41 kg / 86.88 pounds
5 959 Gs
5.91 kg / 13.03 pounds
5912 g / 58.0 N
 35.47 kg / 78.20 pounds
~0 Gs
10 mm 23.92 kg / 52.73 pounds
4 643 Gs
3.59 kg / 7.91 pounds
3588 g / 35.2 N
 21.53 kg / 47.46 pounds
~0 Gs
20 mm 8.33 kg / 18.36 pounds
2 739 Gs
1.25 kg / 2.75 pounds
1249 g / 12.3 N
 7.49 kg / 16.52 pounds
~0 Gs
50 mm 0.55 kg / 1.22 pounds
705 Gs
0.08 kg / 0.18 pounds
83 g / 0.8 N
 0.50 kg / 1.09 pounds
~0 Gs
60 mm 0.26 kg / 0.58 pounds
487 Gs
0.04 kg / 0.09 pounds
40 g / 0.4 N
 0.24 kg / 0.52 pounds
~0 Gs
70 mm 0.13 kg / 0.30 pounds
348 Gs
0.02 kg / 0.04 pounds
20 g / 0.2 N
 0.12 kg / 0.27 pounds
~0 Gs
80 mm 0.07 kg / 0.16 pounds
256 Gs
0.01 kg / 0.02 pounds
11 g / 0.1 N
 0.07 kg / 0.14 pounds
~0 Gs
90 mm 0.04 kg / 0.09 pounds
194 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
100 mm 0.02 kg / 0.05 pounds
149 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and steel combination. The setup of magnet-to-magnet produces a massive flux and a larger range of action. Designing a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is huge. The levitation is a bit weaker than the attraction, but still impressive.
*The magnetic induction between like poles drops to ~0 Gs in the exact middle of the gap (resulting from vector opposition).
* Figures refer to sliding force of dual identical magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - warnings
MPL 40x18x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.0 cm
Hearing aid 10 Gs (1.0 mT) 11.0 cm
Mechanical watch 20 Gs (2.0 mT) 8.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Extremely neodym field poses a serious hazard to IT equipment and pacemakers. These neodymiums produce a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation penetrates the body and glass. Special caution must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MPL 40x18x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.95 km/h
(6.38 m/s)
 1.10 J
30 mm 36.78 km/h
(10.22 m/s)
 2.82 J
50 mm 47.37 km/h
(13.16 m/s)
 4.67 J
100 mm 66.97 km/h
(18.60 m/s)
 9.34 J
Neodymium magnets are very brittle – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely speeds with massive force. Impact energy can cause material chips or painful pinches to fingers. Hold the magnet firmly 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 safety glasses when playing with powerful specimens.

Table 9: Surface protection spec
MPL 40x18x10 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MPL 40x18x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 26 060 Mx 260.6 µWb
Pc Coefficient 0.43 Low (Flat)
Flux value passing through the magnet pole. Essential parameter for generator designers and motors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 40x18x10 / N38

Environment Effective steel pull Effect
Air (land) 23.81 kg Standard
Water (riverbed) 27.26 kg
(+3.45 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!
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

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

2. Efficiency vs thickness

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

3. Power loss vs temp

*For standard magnets, 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

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.

Technical specification and ecology
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%
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: 020156-2026
Measurement Calculator
Force (pull)
Magnetic Induction
Input a figure in just one slot to see the conversion for the other fields immediately.

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Component MPL 40x18x10 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 233.58 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. To separate the MPL 40x18x10 / 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 fasteners 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.
For mounting flat magnets MPL 40x18x10 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 40x18x10 / N38 model is magnetized axially (dimension 10 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 18 mm (width), and 10 mm (thickness). The key parameter here is the holding force amounting to approximately 23.81 kg (force ~233.58 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Apart from their notable power, neodymium magnets have these key benefits:
  • They retain full power for almost ten years – the drop is just ~1% (according to analyses),
  • They retain their magnetic properties even under external field action,
  • In other words, due to the metallic layer of gold, the element is aesthetically pleasing,
  • Magnets are characterized by very high magnetic induction on the active area,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to the possibility of precise molding and customization to unique projects, magnetic components can be manufactured in a broad palette of geometric configurations, which amplifies use scope,
  • Wide application in high-tech industry – they serve a role in mass storage devices, motor assemblies, medical devices, also complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of creating threads in the magnet and complex forms - preferred is casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these devices can disrupt the diagnostic process medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Maximum lifting capacity of the magnet – what contributes to it?

The force parameter is a theoretical maximum value executed under standard conditions:
  • with the application of a yoke made of special test steel, guaranteeing maximum field concentration
  • possessing a thickness of min. 10 mm to avoid saturation
  • with an polished touching surface
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial force direction (90-degree angle)
  • at temperature room level

Magnet lifting force in use – key factors

It is worth knowing that the application force may be lower subject to elements below, starting with the most relevant:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin plate causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Material type – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Thermal factor – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was determined using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate reduces the lifting capacity.

H&S for magnets
Machining danger

Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Handling rules

Before use, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Physical harm

Big blocks can crush fingers instantly. Do not put your hand betwixt two strong magnets.

Swallowing risk

Always store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are tragic.

Data carriers

Do not bring magnets near a wallet, computer, or TV. The magnetism can permanently damage these devices and erase data from cards.

Medical implants

People with a pacemaker must keep an absolute distance from magnets. The magnetic field can stop the functioning of the implant.

Do not overheat magnets

Avoid heat. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Protective goggles

Beware of splinters. Magnets can fracture upon violent connection, launching shards into the air. Eye protection is mandatory.

Metal Allergy

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness appears, immediately stop handling magnets and use protective gear.

Precision electronics

Navigation devices and smartphones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Caution! Learn more about risks in the article: Magnet Safety Guide.