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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

check technical specifications »

17.96 ZŁ with VAT / pcs + price for transport

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Detailed specification - 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

Technical modeling of the product - data

Presented data represent the outcome of a mathematical calculation. Values rely on algorithms for the class Nd2Fe14B. Real-world performance may differ. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - 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
 low risk
15 mm 455 Gs
45.5 mT
 0.55 kg / 1.21 LBS
550.7 g / 5.4 N
 low risk
20 mm 288 Gs
28.8 mT
 0.22 kg / 0.49 LBS
220.3 g / 2.2 N
 low risk
30 mm 129 Gs
12.9 mT
 0.04 kg / 0.10 LBS
44.4 g / 0.4 N
 low risk
50 mm 38 Gs
3.8 mT
 0.00 kg / 0.01 LBS
3.8 g / 0.0 N
 low risk
Grip strength drops drastically per each millimeter of gap. Remember that even the smallest gap (e.g., contamination, varnish, rust) strongly diminishes the holding power. Magnetic products hold strongest during direct contact; gap weakens the force. Notice how quickly the parameters plummet, when the product does not touch directly to the metal substrate. When designing the assembly, avoid unnecessary gaps.

Table 2: Sliding 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 following data indicates the theoretical shear load required to start the slippage of the magnet downwards on a upright metal surface (assuming typical friction). This parameter is a function of the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - 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 hanging a magnet on a vertical plane (e.g., a car body), it will maintain just about 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that holders move down faster than they pop off the substrate. Designing a vertical fastening? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a noticeably lighter cargo. Using a rubber coating can effectively improve the result.

Table 4: Steel thickness (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 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 metal plate cannot absorb the full magnetic flux, which weakens actual performance of the holder. If you install a neodymium to a weak sheet, the field will pass right through and the holding will be smaller. To achieve full efficiency of this neodymium's power, you require a sufficiently solid piece of metal. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the magnet works worse. We suggest choosing the steel cross-section according to the table below.

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 change their properties strength above the temperature limit. Watch out for overheating – excessive heat can permanently demagnetize this product. With every degree above norm, the magnet's power temporarily decreases. Avoid using this product near heat sources exceeding its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) may lose charge permanently sooner than long magnets. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 magnetic products interact from a much further distance than a magnet and steel setup. Such a system of magnet-to-magnet produces a massive flux and a wider radius of performance. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is massive. The levitation is slightly lower than the connection force, but still impressive.
*The magnetic induction between like poles drops to ~0 Gs at the midpoint of the gap (due to field cancellation).
Attention: Results demonstrate friction force of two same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (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
Mechanical watch 20 Gs (2.0 mT) 6.5 cm
Phone / Smartphone 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
Powerful magnet radiation poses a serious hazard to electronics as well as pacemakers. These magnets generate a field that disrupts operation of digital equipment. Be aware: the invisible magnetic field acts through matter and plastic. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - 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 very brittle – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Striking energy can cause material chips or painful pinches to skin. Be sure to control the product during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles 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)
The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction 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)
Total magnetic flux passing through the magnet pole. Key data for generator designers as well as sensors. Pc value defines the magnet's operating point.

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%
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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

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

2. Steel saturation

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

3. Power loss vs temp

*For standard magnets, 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.

Technical specification and ecology
Material specification
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
Quick Unit Converter
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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 40x20x4 mm and a weight of 24 g, guarantees premium class connection. As a block magnet with high power (approx. 7.52 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block 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.
Plate magnets MPL 40x20x4x2[7/3.5] / 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. 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. 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 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. In practice, this means that this magnet has the greatest attraction force on its main planes (40x20 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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 20 mm (width), and 4 mm (thickness). 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.

Advantages as well as disadvantages of rare earth magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for around 10 years – the drop is just ~1% (based on simulations),
  • Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
  • A magnet with a smooth gold surface is more attractive,
  • Magnetic induction on the top side of the magnet turns out to be extremely intense,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of detailed creating as well as adapting to atypical applications,
  • Huge importance in future technologies – they are commonly used in data components, brushless drives, medical equipment, and technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. 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.
  • Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic holder.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these devices are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

The force parameter is a theoretical maximum value performed under the following configuration:
  • using a sheet made of mild steel, functioning as a ideal flux conductor
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • under conditions of gap-free contact (metal-to-metal)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Practical lifting capacity: influencing factors

Bear in mind that the magnet holding will differ depending on elements below, starting with the most relevant:
  • Clearance – existence of foreign body (rust, tape, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be escaped to the other side.
  • Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet and the plate lowers the lifting capacity.

H&S for magnets
Mechanical processing

Dust produced during grinding of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Pinching danger

Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Risk of cracking

Neodymium magnets are ceramic materials, which means they are prone to chipping. Clashing of two magnets leads to them breaking into small pieces.

Nickel coating and allergies

Allergy Notice: The nickel-copper-nickel coating contains nickel. If an allergic reaction appears, immediately stop handling magnets and use protective gear.

Keep away from electronics

Be aware: neodymium magnets produce a field that interferes with precision electronics. Maintain a safe distance from your mobile, device, and navigation systems.

Swallowing risk

Only for adults. Small elements pose a choking risk, leading to serious injuries. Store away from kids and pets.

Warning for heart patients

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Heat sensitivity

Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Safe distance

Intense magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Conscious usage

Be careful. Neodymium magnets act from a distance and snap with huge force, often faster than you can react.

Attention! Want to know more? Read our article: Are neodymium magnets dangerous?