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MPL 50x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020473

GTIN/EAN: 5906301811930

5.00
Load capacity 12.69 kg / 124.48 N Magnetic Induction 197.73 mT / 1977 Gs
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
37.5 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

product parameters »

11.84 zł net / pcs

14.56 zł with VAT (23% VAT) / pcs

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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.

PDF report Calculator
Want to talk magnets?

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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Technical of the product - MPL 50x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020473
GTIN/EAN 5906301811930
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 50 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 37.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 12.69 kg / 124.48 N
Magnetic Induction ~ ? 197.73 mT / 1977 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x5 / 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

Technical modeling of the assembly - report

Presented values constitute the outcome of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - power drop
MPL 50x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1977 Gs
197.7 mT
 12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
 crushing
1 mm 1885 Gs
188.5 mT
 11.53 kg / 25.42 pounds
11530.3 g / 113.1 N
 crushing
2 mm 1772 Gs
177.2 mT
 10.20 kg / 22.49 pounds
10199.9 g / 100.1 N
 crushing
3 mm 1649 Gs
164.9 mT
 8.83 kg / 19.47 pounds
8831.3 g / 86.6 N
 warning
5 mm 1395 Gs
139.5 mT
 6.32 kg / 13.93 pounds
6320.3 g / 62.0 N
 warning
10 mm 870 Gs
87.0 mT
 2.46 kg / 5.42 pounds
2459.4 g / 24.1 N
 warning
15 mm 549 Gs
54.9 mT
 0.98 kg / 2.15 pounds
976.9 g / 9.6 N
 low risk
20 mm 359 Gs
35.9 mT
 0.42 kg / 0.92 pounds
418.9 g / 4.1 N
 low risk
30 mm 172 Gs
17.2 mT
 0.10 kg / 0.21 pounds
95.7 g / 0.9 N
 low risk
50 mm 54 Gs
5.4 mT
 0.01 kg / 0.02 pounds
9.5 g / 0.1 N
 low risk
Pulling power drops drastically with every mm of gap. Note that every additional insulation layer (e.g., contamination, paint, rust) noticeably reduces the pull force. Magnets work most effectively during direct contact; gap drastically cuts the force. Notice how rapidly the load capacity drop, when the magnet does not touch flatly to the metal substrate. When designing the arrangement, discard additional spacers.

Table 2: Sliding force (wall)
MPL 50x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.54 kg / 5.60 pounds
2538.0 g / 24.9 N
1 mm Stal (~0.2) 2.31 kg / 5.08 pounds
2306.0 g / 22.6 N
2 mm Stal (~0.2) 2.04 kg / 4.50 pounds
2040.0 g / 20.0 N
3 mm Stal (~0.2) 1.77 kg / 3.89 pounds
1766.0 g / 17.3 N
5 mm Stal (~0.2) 1.26 kg / 2.79 pounds
1264.0 g / 12.4 N
10 mm Stal (~0.2) 0.49 kg / 1.08 pounds
492.0 g / 4.8 N
15 mm Stal (~0.2) 0.20 kg / 0.43 pounds
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.08 kg / 0.19 pounds
84.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 pounds
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
The following data presents the theoretical holding capacity necessary to initiate the downward movement of the magnet downwards along a upright steel wall (considering standard friction coefficient). The holding force is relative to the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 50x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.81 kg / 8.39 pounds
3807.0 g / 37.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.54 kg / 5.60 pounds
2538.0 g / 24.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.27 kg / 2.80 pounds
1269.0 g / 12.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.35 kg / 13.99 pounds
6345.0 g / 62.2 N
When placing a holder on a upright wall (e.g., a car body), it will only hold just about 1/5 of its nominal power. Gravitational force as well as a weak degree of grip cause that holders move down faster than they detach. Designing a wall mount? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slide down under a noticeably lighter cargo. Using a rubber layer can significantly increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 50x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.63 kg / 1.40 pounds
634.5 g / 6.2 N
1 mm
13%
 1.59 kg / 3.50 pounds
1586.3 g / 15.6 N
2 mm
25%
 3.17 kg / 6.99 pounds
3172.5 g / 31.1 N
3 mm
38%
 4.76 kg / 10.49 pounds
4758.8 g / 46.7 N
5 mm
63%
 7.93 kg / 17.49 pounds
7931.2 g / 77.8 N
10 mm
100%
 12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
11 mm
100%
 12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
12 mm
100%
 12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
A thin sheet is not enough to focus the full magnetic flux, which wastes potential of the magnet. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To squeeze 100% of this magnet's potential, you require a sufficiently solid backing of steel. The saturation effect means that on thin elements (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal resistance (material behavior) - power drop
MPL 50x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
 OK
40 °C -2.2% 12.41 kg / 27.36 pounds
12410.8 g / 121.8 N
 OK
60 °C -4.4% 12.13 kg / 26.75 pounds
12131.6 g / 119.0 N
80 °C -6.6% 11.85 kg / 26.13 pounds
11852.5 g / 116.3 N
100 °C -28.8% 9.04 kg / 19.92 pounds
9035.3 g / 88.6 N
Standard neodymium magnets lose power above the temperature limit. Protect against heat – excessive heat can permanently damage this magnet. With every degree above norm, the magnet's capacity briefly drops. Refrain from using this magnet near heat sources exceeding its operating temperature limit. Ignoring the limit will cause destruction of magnetism.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties sooner than long magnets. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MPL 50x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 24.10 kg / 53.12 pounds
3 371 Gs
3.61 kg / 7.97 pounds
3614 g / 35.5 N
 N/A
1 mm 23.06 kg / 50.84 pounds
3 868 Gs
3.46 kg / 7.63 pounds
3459 g / 33.9 N
 20.75 kg / 45.75 pounds
~0 Gs
2 mm 21.89 kg / 48.27 pounds
3 769 Gs
3.28 kg / 7.24 pounds
3284 g / 32.2 N
 19.71 kg / 43.44 pounds
~0 Gs
3 mm 20.65 kg / 45.53 pounds
3 661 Gs
3.10 kg / 6.83 pounds
3098 g / 30.4 N
 18.59 kg / 40.98 pounds
~0 Gs
5 mm 18.07 kg / 39.83 pounds
3 424 Gs
2.71 kg / 5.97 pounds
2710 g / 26.6 N
 16.26 kg / 35.84 pounds
~0 Gs
10 mm 12.00 kg / 26.46 pounds
2 790 Gs
1.80 kg / 3.97 pounds
1800 g / 17.7 N
 10.80 kg / 23.81 pounds
~0 Gs
20 mm 4.67 kg / 10.30 pounds
1 741 Gs
0.70 kg / 1.54 pounds
701 g / 6.9 N
 4.20 kg / 9.27 pounds
~0 Gs
50 mm 0.37 kg / 0.81 pounds
488 Gs
0.06 kg / 0.12 pounds
55 g / 0.5 N
 0.33 kg / 0.73 pounds
~0 Gs
60 mm 0.18 kg / 0.40 pounds
343 Gs
0.03 kg / 0.06 pounds
27 g / 0.3 N
 0.16 kg / 0.36 pounds
~0 Gs
70 mm 0.10 kg / 0.21 pounds
248 Gs
0.01 kg / 0.03 pounds
14 g / 0.1 N
 0.09 kg / 0.19 pounds
~0 Gs
80 mm 0.05 kg / 0.12 pounds
184 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.10 pounds
~0 Gs
90 mm 0.03 kg / 0.07 pounds
140 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
 0.03 kg / 0.06 pounds
~0 Gs
100 mm 0.02 kg / 0.04 pounds
108 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
Two magnetic products interact from a much further distance than a neodymium and metal combination. The connection of two magnets produces a massive flux and a larger range of action. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the impact force is huge. The repulsion force is marginally weaker than the connection force, but still significant.
*Flux density for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (due to field cancellation).
Important: Estimates refer to friction force of two identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - warnings
MPL 50x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Timepiece 20 Gs (2.0 mT) 7.5 cm
Mobile device 40 Gs (4.0 mT) 6.0 cm
Car key 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a real danger to electronics as well as medical implants. These NdFeB products generate a flux that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field acts through matter and housings. Special caution must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MPL 50x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.52 km/h
(5.98 m/s)
 0.67 J
30 mm 23.53 km/h
(6.54 m/s)
 0.80 J
50 mm 23.63 km/h
(6.56 m/s)
 0.81 J
100 mm 23.65 km/h
(6.57 m/s)
 0.81 J
Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a magnet released freely becomes dangerous. Kinetic force can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the neodymium. Use safety goggles when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 50x20x5 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MPL 50x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 20 792 Mx 207.9 µWb
Pc Coefficient 0.21 Low (Flat)
Flux value passing through the pole surface. Key data in coil applications and motors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
MPL 50x20x5 / N38

Environment Effective steel pull Effect
Air (land) 12.69 kg Standard
Water (riverbed) 14.53 kg
(+1.84 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!
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Sliding resistance

*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) severely limits 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) = 0.21

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 specification and ecology

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%

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: 020473-2026
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Component MPL 50x20x5 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 12.69 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 strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 50x20x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 12.69 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 50x20x5 / N38 model is magnetized through the thickness (dimension 5 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 (50x20 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 50x20x5 mm, which, at a weight of 37.5 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 12.69 kg (force ~124.48 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of rare earth magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have stable power, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
  • Neodymium magnets are characterized by extremely resistant to loss of magnetic properties caused by external magnetic fields,
  • Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold, or silver gives an elegant appearance,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of exact creating and adjusting to atypical requirements,
  • Versatile presence in modern technologies – they are commonly used in magnetic memories, brushless drives, precision medical tools, also industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength 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 prevent oxidation and corrosion.
  • We recommend a housing - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small elements of these products can be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

Holding force of 12.69 kg is a theoretical maximum value conducted under the following configuration:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose thickness equals approx. 10 mm
  • with an ideally smooth contact surface
  • with total lack of distance (without coatings)
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Practical lifting capacity: influencing factors

Please note that the magnet holding will differ depending on elements below, starting with the most relevant:
  • Distance (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits 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 generating force.
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and lifting capacity.
  • Surface quality – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, however under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with NdFeB magnets
Choking Hazard

Product intended for adults. Tiny parts can be swallowed, causing serious injuries. Store away from children and animals.

Powerful field

Use magnets consciously. Their huge power can surprise even experienced users. Be vigilant and do not underestimate their power.

Do not overheat magnets

Avoid heat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Pinching danger

Large magnets can smash fingers instantly. Never put your hand betwixt two attracting surfaces.

Risk of cracking

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Threat to electronics

Intense magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Warning for allergy sufferers

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness happens, immediately stop working with magnets and wear gloves.

Flammability

Powder generated during grinding of magnets is combustible. Do not drill into magnets unless you are an expert.

Pacemakers

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

Magnetic interference

Remember: rare earth magnets produce a field that interferes with sensitive sensors. Keep a separation from your mobile, device, and GPS.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?