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MPL 30x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020141

GTIN/EAN: 5906301811473

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

45 g

Magnetization Direction

↑ axial

Load capacity

19.53 kg / 191.55 N

Magnetic Induction

371.57 mT / 3716 Gs

Coating

[NiCuNi] Nickel

see specifications »

16.11 ZŁ with VAT / pcs + price for transport

13.10 ZŁ net + 23% VAT / pcs

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Contact us by phone +48 888 99 98 98 alternatively send us a note using form through our site.
Force as well as appearance of a neodymium magnet can be analyzed using our online calculation tool.

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Technical of the product - MPL 30x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020141
GTIN/EAN 5906301811473
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 30 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 45 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.53 kg / 191.55 N
Magnetic Induction ~ ? 371.57 mT / 3716 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x10 / N38 - lamellar magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Technical simulation of the product - report

Presented values represent the outcome of a mathematical analysis. Values are based on algorithms for the material Nd2Fe14B. Operational performance may differ from theoretical values. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs distance) - characteristics
MPL 30x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3715 Gs
371.5 mT
 19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
 crushing
1 mm 3464 Gs
346.4 mT
 16.98 kg / 37.44 pounds
16983.1 g / 166.6 N
 crushing
2 mm 3197 Gs
319.7 mT
 14.47 kg / 31.89 pounds
14466.6 g / 141.9 N
 crushing
3 mm 2927 Gs
292.7 mT
 12.12 kg / 26.73 pounds
12123.3 g / 118.9 N
 crushing
5 mm 2408 Gs
240.8 mT
 8.21 kg / 18.10 pounds
8207.8 g / 80.5 N
 warning
10 mm 1411 Gs
141.1 mT
 2.82 kg / 6.21 pounds
2815.6 g / 27.6 N
 warning
15 mm 832 Gs
83.2 mT
 0.98 kg / 2.16 pounds
979.7 g / 9.6 N
 low risk
20 mm 512 Gs
51.2 mT
 0.37 kg / 0.82 pounds
371.2 g / 3.6 N
 low risk
30 mm 224 Gs
22.4 mT
 0.07 kg / 0.16 pounds
70.7 g / 0.7 N
 low risk
50 mm 65 Gs
6.5 mT
 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
 low risk
Grip strength weakens significantly with every subsequent millimeter of spacing. Note that every additional insulation layer (e.g., dirt, varnish, rust) strongly reduces the pull force. Magnets work optimally during direct contact; distance weakens the force. Notice how quickly the parameters fall, when the product does not touch flatly to the steel surface. When designing the assembly, avoid additional spacers.

Table 2: Shear capacity (wall)
MPL 30x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.91 kg / 8.61 pounds
3906.0 g / 38.3 N
1 mm Stal (~0.2) 3.40 kg / 7.49 pounds
3396.0 g / 33.3 N
2 mm Stal (~0.2) 2.89 kg / 6.38 pounds
2894.0 g / 28.4 N
3 mm Stal (~0.2) 2.42 kg / 5.34 pounds
2424.0 g / 23.8 N
5 mm Stal (~0.2) 1.64 kg / 3.62 pounds
1642.0 g / 16.1 N
10 mm Stal (~0.2) 0.56 kg / 1.24 pounds
564.0 g / 5.5 N
15 mm Stal (~0.2) 0.20 kg / 0.43 pounds
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.07 kg / 0.16 pounds
74.0 g / 0.7 N
30 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
The table below shows the approximate weight limit sufficient to start the slippage of the magnet down against a vertical steel wall (considering typical friction). The holding force depends on the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 30x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.86 kg / 12.92 pounds
5859.0 g / 57.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.91 kg / 8.61 pounds
3906.0 g / 38.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.95 kg / 4.31 pounds
1953.0 g / 19.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.77 kg / 21.53 pounds
9765.0 g / 95.8 N
When mounting a holder on a vertical surface (e.g., a fridge), it will only hold barely approx. 20%-30% of its nominal power. Gravitational force and a weak degree of grip cause that magnets slip faster than they pop off the substrate. Planning a vertical fastening? Note that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a much lighter load. Using a rubber pad can effectively improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MPL 30x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.98 kg / 2.15 pounds
976.5 g / 9.6 N
1 mm
13%
 2.44 kg / 5.38 pounds
2441.3 g / 23.9 N
2 mm
25%
 4.88 kg / 10.76 pounds
4882.5 g / 47.9 N
3 mm
38%
 7.32 kg / 16.15 pounds
7323.8 g / 71.8 N
5 mm
63%
 12.21 kg / 26.91 pounds
12206.3 g / 119.7 N
10 mm
100%
 19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
11 mm
100%
 19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
12 mm
100%
 19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
A too thin steel is unable to absorb the entire magnetic field, which wastes potential of the holder. If you attach a powerful product to a weak sheet, the magnetism will penetrate right through and the holding will be smaller. To utilize 100% of this neodymium's potential, you need a suitably thick backing of steel. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the magnet works worse. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal stability (material behavior) - thermal limit
MPL 30x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
 OK
40 °C -2.2% 19.10 kg / 42.11 pounds
19100.3 g / 187.4 N
 OK
60 °C -4.4% 18.67 kg / 41.16 pounds
18670.7 g / 183.2 N
80 °C -6.6% 18.24 kg / 40.21 pounds
18241.0 g / 178.9 N
100 °C -28.8% 13.91 kg / 30.66 pounds
13905.4 g / 136.4 N
Classic neodymiums irreversibly lose power past the thermal threshold. Protect against heat – heat can irreversibly damage this magnet. With every degree above norm, the magnet's capacity briefly drops. Avoid using this magnet near heat sources higher than its safe range. Exceeding the critical threshold will cause destruction of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 30x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 51.05 kg / 112.54 pounds
5 124 Gs
7.66 kg / 16.88 pounds
7657 g / 75.1 N
 N/A
1 mm 47.76 kg / 105.28 pounds
7 186 Gs
7.16 kg / 15.79 pounds
7163 g / 70.3 N
 42.98 kg / 94.76 pounds
~0 Gs
2 mm 44.39 kg / 97.86 pounds
6 928 Gs
6.66 kg / 14.68 pounds
6658 g / 65.3 N
 39.95 kg / 88.08 pounds
~0 Gs
3 mm 41.06 kg / 90.52 pounds
6 663 Gs
6.16 kg / 13.58 pounds
6159 g / 60.4 N
 36.95 kg / 81.47 pounds
~0 Gs
5 mm 34.68 kg / 76.45 pounds
6 124 Gs
5.20 kg / 11.47 pounds
5202 g / 51.0 N
 31.21 kg / 68.81 pounds
~0 Gs
10 mm 21.45 kg / 47.30 pounds
4 817 Gs
3.22 kg / 7.09 pounds
3218 g / 31.6 N
 19.31 kg / 42.57 pounds
~0 Gs
20 mm 7.36 kg / 16.22 pounds
2 821 Gs
1.10 kg / 2.43 pounds
1104 g / 10.8 N
 6.62 kg / 14.60 pounds
~0 Gs
50 mm 0.40 kg / 0.89 pounds
662 Gs
0.06 kg / 0.13 pounds
61 g / 0.6 N
 0.36 kg / 0.80 pounds
~0 Gs
60 mm 0.18 kg / 0.41 pounds
447 Gs
0.03 kg / 0.06 pounds
28 g / 0.3 N
 0.17 kg / 0.37 pounds
~0 Gs
70 mm 0.09 kg / 0.20 pounds
314 Gs
0.01 kg / 0.03 pounds
14 g / 0.1 N
 0.08 kg / 0.18 pounds
~0 Gs
80 mm 0.05 kg / 0.11 pounds
228 Gs
0.01 kg / 0.02 pounds
7 g / 0.1 N
 0.04 kg / 0.10 pounds
~0 Gs
90 mm 0.03 kg / 0.06 pounds
170 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
100 mm 0.02 kg / 0.03 pounds
130 Gs
0.00 kg / 0.01 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
Two strong neodymiums attract each other from a much further distance than a neodymium and metal combination. The connection of magnet-to-magnet produces a massive flux and a wider radius of performance. Want to build a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Be careful that when bringing together two magnets, the collision energy is massive. The repulsion force is marginally weaker than the attraction, but still significant.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Attention: Calculations demonstrate shear force of two identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - precautionary measures
MPL 30x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.0 cm
Timepiece 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 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
Powerful magnet radiation poses a real danger to IT equipment as well as medical implants. These NdFeB products produce a flux that prevents correct functioning of digital equipment. Be aware: the unseen radiation acts through matter and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MPL 30x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.82 km/h
(6.34 m/s)
 0.90 J
30 mm 36.47 km/h
(10.13 m/s)
 2.31 J
50 mm 46.99 km/h
(13.05 m/s)
 3.83 J
100 mm 66.44 km/h
(18.46 m/s)
 7.66 J
Neodymium magnets are prone to chipping – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or injury to skin. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when working with large magnets.

Table 9: Anti-corrosion coating durability
MPL 30x20x10 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MPL 30x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 801 Mx 228.0 µWb
Pc Coefficient 0.46 Low (Flat)
Total magnetic flux emitted by the magnet pole. Key data for generator designers and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 30x20x10 / N38

Environment Effective steel pull Effect
Air (land) 19.53 kg Standard
Water (riverbed) 22.36 kg
(+2.83 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
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 just a fraction of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.46

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical and environmental data
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: 020141-2026
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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 30x20x10 mm and a weight of 45 g, guarantees the highest quality connection. This magnetic block with a force of 191.55 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is sliding 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. Watch your fingers! Magnets with a force of 19.53 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 30x20x10 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. 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. 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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 30x20x10 / N38 model is magnetized axially (dimension 10 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (30x20 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 30x20x10 mm, which, at a weight of 45 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 19.53 kg (force ~191.55 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • Magnets perfectly resist against demagnetization caused by ambient magnetic noise,
  • By covering with a reflective layer of gold, the element presents an modern look,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Considering the ability of flexible molding and customization to custom requirements, NdFeB magnets can be produced in a variety of geometric configurations, which expands the range of possible applications,
  • Versatile presence in high-tech industry – they are utilized in hard drives, electromotive mechanisms, medical devices, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in miniature devices

Limitations

What to avoid - cons of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Limited ability of creating nuts in the magnet and complex shapes - recommended is a housing - magnet mounting.
  • Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Maximum holding power of the magnet – what contributes to it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, assuming:
  • on a block made of structural steel, effectively closing the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • with a plane cleaned and smooth
  • under conditions of gap-free contact (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • at room temperature

Key elements affecting lifting force

Bear in mind that the magnet holding will differ depending on elements below, starting with the most relevant:
  • Clearance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel type – mild steel attracts best. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Temperature – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Cards and drives

Intense magnetic fields can destroy records on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Skin irritation risks

Studies show that nickel (standard magnet coating) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands and opt for coated magnets.

Magnets are brittle

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

Hand protection

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

Dust explosion hazard

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.

Permanent damage

Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

Powerful field

Handle magnets consciously. Their powerful strength can shock even professionals. Be vigilant and respect their force.

ICD Warning

Patients with a ICD must keep an absolute distance from magnets. The magnetism can stop the operation of the implant.

Compass and GPS

Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Danger to the youngest

Only for adults. Small elements can be swallowed, causing serious injuries. Keep away from kids and pets.

Attention! Learn more about hazards in the article: Magnet Safety Guide.