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MPL 40x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020158

GTIN/EAN: 5906301811640

length

40 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

60 g

Magnetization Direction

↑ axial

Load capacity

24.62 kg / 241.53 N

Magnetic Induction

349.60 mT / 3496 Gs

Coating

[NiCuNi] Nickel

technical specifications »

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Technical - MPL 40x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 40x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020158
GTIN/EAN 5906301811640
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 10 mm [±0,1 mm]
Weight 60 g
Magnetization Direction ↑ axial
Load capacity ~ ? 24.62 kg / 241.53 N
Magnetic Induction ~ ? 349.60 mT / 3496 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x20x10 / 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

Physical simulation of the assembly - data

Presented values are the result of a engineering simulation. Values rely on algorithms for the class Nd2Fe14B. Real-world performance might slightly differ. Treat these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - power drop
MPL 40x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3495 Gs
349.5 mT
 24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
 crushing
1 mm 3272 Gs
327.2 mT
 21.58 kg / 47.57 pounds
21578.0 g / 211.7 N
 crushing
2 mm 3035 Gs
303.5 mT
 18.56 kg / 40.92 pounds
18559.3 g / 182.1 N
 crushing
3 mm 2794 Gs
279.4 mT
 15.73 kg / 34.69 pounds
15733.0 g / 154.3 N
 crushing
5 mm 2332 Gs
233.2 mT
 10.96 kg / 24.16 pounds
10959.2 g / 107.5 N
 crushing
10 mm 1433 Gs
143.3 mT
 4.14 kg / 9.12 pounds
4136.4 g / 40.6 N
 medium risk
15 mm 891 Gs
89.1 mT
 1.60 kg / 3.52 pounds
1598.7 g / 15.7 N
 safe
20 mm 574 Gs
57.4 mT
 0.66 kg / 1.46 pounds
664.0 g / 6.5 N
 safe
30 mm 267 Gs
26.7 mT
 0.14 kg / 0.32 pounds
143.7 g / 1.4 N
 safe
50 mm 82 Gs
8.2 mT
 0.01 kg / 0.03 pounds
13.7 g / 0.1 N
 safe
Pulling power weakens significantly per each millimeter of spacing. Remember that every additional insulation layer (e.g., dirt, varnish, rust) strongly diminishes the holding power. Magnetic products operate optimally in perfect adhesion; gap kills the power. Analyze how quickly the pull force fall, when the magnet does not touch tightly to the steel surface. When designing the arrangement, avoid unnecessary gaps.

Table 2: Shear hold (vertical surface)
MPL 40x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.92 kg / 10.86 pounds
4924.0 g / 48.3 N
1 mm Stal (~0.2) 4.32 kg / 9.52 pounds
4316.0 g / 42.3 N
2 mm Stal (~0.2) 3.71 kg / 8.18 pounds
3712.0 g / 36.4 N
3 mm Stal (~0.2) 3.15 kg / 6.94 pounds
3146.0 g / 30.9 N
5 mm Stal (~0.2) 2.19 kg / 4.83 pounds
2192.0 g / 21.5 N
10 mm Stal (~0.2) 0.83 kg / 1.83 pounds
828.0 g / 8.1 N
15 mm Stal (~0.2) 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
20 mm Stal (~0.2) 0.13 kg / 0.29 pounds
132.0 g / 1.3 N
30 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
This section defines the approximate weight limit needed to initiate the shifting of the magnet down on a vertical metal surface (considering typical friction). This value is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MPL 40x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.39 kg / 16.28 pounds
7386.0 g / 72.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.92 kg / 10.86 pounds
4924.0 g / 48.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.46 kg / 5.43 pounds
2462.0 g / 24.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.31 kg / 27.14 pounds
12310.0 g / 120.8 N
When hanging a magnet on a vertical wall (e.g., a car body), it will only hold just about 1/5 of its nominal power. Gravitational force as well as a low friction coefficient cause that magnets slip faster than they detach. Designing a hanger? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will give way down under a noticeably lighter load. Utilizing a rubberized coating can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MPL 40x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.23 kg / 2.71 pounds
1231.0 g / 12.1 N
1 mm
13%
 3.08 kg / 6.78 pounds
3077.5 g / 30.2 N
2 mm
25%
 6.16 kg / 13.57 pounds
6155.0 g / 60.4 N
3 mm
38%
 9.23 kg / 20.35 pounds
9232.5 g / 90.6 N
5 mm
63%
 15.39 kg / 33.92 pounds
15387.5 g / 151.0 N
10 mm
100%
 24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
11 mm
100%
 24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
12 mm
100%
 24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
A too thin steel cannot take in the full magnetic flux, which weakens actual performance of the holder. If you install a neodymium to a weak sheet, the magnetism will pass right through and the holding will be smaller. To achieve full efficiency of this magnet's potential, you need a suitably thick element of metal. The saturation phenomenon causes that on thin elements (e.g., car bodies), the holder shows lower pull force. We advise picking the steel cross-section according to the table below.

Table 5: Working in heat (material behavior) - power drop
MPL 40x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
 OK
40 °C -2.2% 24.08 kg / 53.08 pounds
24078.4 g / 236.2 N
 OK
60 °C -4.4% 23.54 kg / 51.89 pounds
23536.7 g / 230.9 N
80 °C -6.6% 23.00 kg / 50.70 pounds
22995.1 g / 225.6 N
100 °C -28.8% 17.53 kg / 38.65 pounds
17529.4 g / 172.0 N
Standard neodymium magnets lose strength above the temperature limit. Watch out for overheating – excessive heat can permanently demagnetize this product. As the temperature rises, the neodymium's force temporarily drops. Do not use this product close to ovens higher than its operating temperature limit. Too high temperature will lead to destruction of magnetism.
*Technical advisory: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) may lose charge permanently under lower heat stress than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 40x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 60.25 kg / 132.83 pounds
4 926 Gs
9.04 kg / 19.93 pounds
9038 g / 88.7 N
 N/A
1 mm 56.58 kg / 124.73 pounds
6 774 Gs
8.49 kg / 18.71 pounds
8487 g / 83.3 N
 50.92 kg / 112.26 pounds
~0 Gs
2 mm 52.81 kg / 116.42 pounds
6 544 Gs
7.92 kg / 17.46 pounds
7921 g / 77.7 N
 47.53 kg / 104.78 pounds
~0 Gs
3 mm 49.07 kg / 108.19 pounds
6 309 Gs
7.36 kg / 16.23 pounds
7361 g / 72.2 N
 44.17 kg / 97.37 pounds
~0 Gs
5 mm 41.89 kg / 92.34 pounds
5 828 Gs
6.28 kg / 13.85 pounds
6283 g / 61.6 N
 37.70 kg / 83.11 pounds
~0 Gs
10 mm 26.82 kg / 59.13 pounds
4 664 Gs
4.02 kg / 8.87 pounds
4023 g / 39.5 N
 24.14 kg / 53.22 pounds
~0 Gs
20 mm 10.12 kg / 22.32 pounds
2 865 Gs
1.52 kg / 3.35 pounds
1518 g / 14.9 N
 9.11 kg / 20.09 pounds
~0 Gs
50 mm 0.73 kg / 1.61 pounds
769 Gs
0.11 kg / 0.24 pounds
109 g / 1.1 N
 0.66 kg / 1.45 pounds
~0 Gs
60 mm 0.35 kg / 0.78 pounds
534 Gs
0.05 kg / 0.12 pounds
53 g / 0.5 N
 0.32 kg / 0.70 pounds
~0 Gs
70 mm 0.18 kg / 0.40 pounds
383 Gs
0.03 kg / 0.06 pounds
27 g / 0.3 N
 0.16 kg / 0.36 pounds
~0 Gs
80 mm 0.10 kg / 0.22 pounds
282 Gs
0.01 kg / 0.03 pounds
15 g / 0.1 N
 0.09 kg / 0.20 pounds
~0 Gs
90 mm 0.06 kg / 0.12 pounds
214 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.11 pounds
~0 Gs
100 mm 0.03 kg / 0.07 pounds
165 Gs
0.01 kg / 0.01 pounds
5 g / 0.0 N
 0.03 kg / 0.07 pounds
~0 Gs
Two magnetic products attract each other from a significantly greater distance than a magnet and sheet setup. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Remember that when attracting two neodymiums, the impact force is massive. The repulsion force is slightly lower than the attraction, but still significant.
*The magnetic induction in repulsion mode drops to ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Note: Calculations refer to sliding force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 40x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.5 cm
Hearing aid 10 Gs (1.0 mT) 11.5 cm
Timepiece 20 Gs (2.0 mT) 9.0 cm
Mobile device 40 Gs (4.0 mT) 7.0 cm
Remote 50 Gs (5.0 mT) 6.5 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
A strong magnetic field is a large risk to IT equipment and medical implants. These NdFeB products produce a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation passes through tissues and plastic. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MPL 40x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.47 km/h
(6.24 m/s)
 1.17 J
30 mm 35.51 km/h
(9.86 m/s)
 2.92 J
50 mm 45.70 km/h
(12.69 m/s)
 4.83 J
100 mm 64.60 km/h
(17.95 m/s)
 9.66 J
Magnetic elements are prone to chipping – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can cause material chips or injury to fingers. Always hold the magnet during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Coating parameters (durability)
MPL 40x20x10 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MPL 40x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 28 125 Mx 281.2 µWb
Pc Coefficient 0.42 Low (Flat)
Flux value passing through the pole surface. Essential parameter for generator designers as well as sensors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 40x20x10 / N38

Environment Effective steel pull Effect
Air (land) 24.62 kg Standard
Water (riverbed) 28.19 kg
(+3.57 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Note: On a vertical wall, the magnet holds only ~20% of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Temperature resistance

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.42

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: 020158-2026
Quick Unit Converter
Force (pull)
Field Strength
Just complete one field, to let the calculator calculate the rest instantly.

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Component MPL 40x20x10 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 241.53 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 24.62 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x20x10 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 40x20x10 / 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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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.
This model is characterized by dimensions 40x20x10 mm, which, at a weight of 60 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 24.62 kg (force ~241.53 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They feature excellent resistance to magnetic field loss as a result of external magnetic sources,
  • Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an elegant appearance,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • In view of the possibility of flexible shaping and customization to specialized projects, neodymium magnets can be manufactured in a wide range of forms and dimensions, which expands the range of possible applications,
  • Key role in advanced technology sectors – they are utilized in HDD drives, drive modules, diagnostic systems, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in miniature devices

Disadvantages

Problematic aspects of neodymium magnets and ways of using them
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using a housing - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these devices can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting force for a neodymium magnet – what it depends on?

Magnet power was determined for optimal configuration, including:
  • on a plate made of structural steel, effectively closing the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • with an polished touching surface
  • without any air gap between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Please note that the working load may be lower subject to the following factors, in order of importance:
  • Distance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin plate does not close the flux, causing part of the power to be wasted into the air.
  • Material composition – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
  • Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Physical harm

Big blocks can crush fingers in a fraction of a second. Do not place your hand betwixt two attracting surfaces.

Magnetic media

Powerful magnetic fields can erase data on payment cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Nickel allergy

Studies show that nickel (standard magnet coating) is a common allergen. For allergy sufferers, prevent touching magnets with bare hands and choose versions in plastic housing.

Machining danger

Powder generated during cutting of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Danger to the youngest

These products are not suitable for play. Eating multiple magnets can lead to them connecting inside the digestive tract, which poses a critical condition and requires urgent medical intervention.

Warning for heart patients

Patients with a pacemaker should keep an absolute distance from magnets. The magnetism can interfere with the functioning of the implant.

Maximum temperature

Keep cool. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Handling guide

Use magnets with awareness. Their immense force can shock even professionals. Be vigilant and do not underestimate their force.

Material brittleness

Watch out for shards. Magnets can explode upon violent connection, ejecting shards into the air. Eye protection is mandatory.

Threat to navigation

Remember: neodymium magnets generate a field that disrupts sensitive sensors. Maintain a separation from your phone, tablet, and navigation systems.

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