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MW 40x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010068

GTIN/EAN: 5906301810674

5.00
Load capacity 54.73 kg / 536.88 N Magnetic Induction 515.71 mT / 5157 Gs
Diameter Ø
40 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
282.74 g
Magnetization Direction
→ diametrical
Coating
[NiCuNi] Nickel
product specifications »

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Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

Guides from the knowledge base

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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical data - MW 40x30 / N38 - cylindrical magnet

Specification / characteristics - MW 40x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010068
GTIN/EAN 5906301810674
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 40 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 282.74 g
Magnetization Direction → diametrical
Load capacity ~ ? 54.73 kg / 536.88 N
Magnetic Induction ~ ? 515.71 mT / 5157 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x30 / N38 - cylindrical 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 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

Engineering modeling of the magnet - technical parameters

The following data constitute the direct effect of a engineering simulation. Values are based on algorithms for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Please consider these calculations as a reference point during assembly planning.

Table 1: Static force (pull vs distance) - interaction chart
MW 40x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5156 Gs
515.6 mT
 54.73 kg / 120.66 lbs
54730.0 g / 536.9 N
 critical level
1 mm 4900 Gs
490.0 mT
 49.43 kg / 108.98 lbs
49432.0 g / 484.9 N
 critical level
2 mm 4641 Gs
464.1 mT
 44.33 kg / 97.74 lbs
44334.0 g / 434.9 N
 critical level
3 mm 4383 Gs
438.3 mT
 39.54 kg / 87.17 lbs
39538.7 g / 387.9 N
 critical level
5 mm 3879 Gs
387.9 mT
 30.98 kg / 68.30 lbs
30981.5 g / 303.9 N
 critical level
10 mm 2773 Gs
277.3 mT
 15.83 kg / 34.89 lbs
15826.7 g / 155.3 N
 critical level
15 mm 1946 Gs
194.6 mT
 7.79 kg / 17.18 lbs
7792.9 g / 76.4 N
 warning
20 mm 1372 Gs
137.2 mT
 3.88 kg / 8.55 lbs
3877.9 g / 38.0 N
 warning
30 mm 723 Gs
72.3 mT
 1.08 kg / 2.37 lbs
1076.5 g / 10.6 N
 safe
50 mm 258 Gs
25.8 mT
 0.14 kg / 0.30 lbs
137.4 g / 1.3 N
 safe
Grip strength drops significantly with every mm of distance. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) significantly weakens the grip. Magnets work strongest during direct contact; gap nullifies the power. Analyze how flashily the parameters drop, when the product does not adhere tightly to the metal substrate. When designing the mounting, eliminate additional spacers.

Table 2: Sliding hold (vertical surface)
MW 40x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 10.95 kg / 24.13 lbs
10946.0 g / 107.4 N
1 mm Stal (~0.2) 9.89 kg / 21.79 lbs
9886.0 g / 97.0 N
2 mm Stal (~0.2) 8.87 kg / 19.55 lbs
8866.0 g / 87.0 N
3 mm Stal (~0.2) 7.91 kg / 17.43 lbs
7908.0 g / 77.6 N
5 mm Stal (~0.2) 6.20 kg / 13.66 lbs
6196.0 g / 60.8 N
10 mm Stal (~0.2) 3.17 kg / 6.98 lbs
3166.0 g / 31.1 N
15 mm Stal (~0.2) 1.56 kg / 3.43 lbs
1558.0 g / 15.3 N
20 mm Stal (~0.2) 0.78 kg / 1.71 lbs
776.0 g / 7.6 N
30 mm Stal (~0.2) 0.22 kg / 0.48 lbs
216.0 g / 2.1 N
50 mm Stal (~0.2) 0.03 kg / 0.06 lbs
28.0 g / 0.3 N
The table below presents the estimated force necessary to start the downward movement of the magnet downwards along a upright metal surface (assuming standard friction). This parameter varies with the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 40x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
16.42 kg / 36.20 lbs
16419.0 g / 161.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
10.95 kg / 24.13 lbs
10946.0 g / 107.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
5.47 kg / 12.07 lbs
5473.0 g / 53.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
27.37 kg / 60.33 lbs
27365.0 g / 268.5 N
When placing a magnet on a upright wall (e.g., a car body), it you can count on only approx. 20%-30% of nominal attraction strength. Gravity and a weak degree of grip mean that products slip easier than they detach. Planning a vertical fastening? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a much lighter load. Using a rubber coating can significantly raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 40x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 1.82 kg / 4.02 lbs
1824.3 g / 17.9 N
1 mm
8%
 4.56 kg / 10.05 lbs
4560.8 g / 44.7 N
2 mm
17%
 9.12 kg / 20.11 lbs
9121.7 g / 89.5 N
3 mm
25%
 13.68 kg / 30.16 lbs
13682.5 g / 134.2 N
5 mm
42%
 22.80 kg / 50.27 lbs
22804.2 g / 223.7 N
10 mm
83%
 45.61 kg / 100.55 lbs
45608.3 g / 447.4 N
11 mm
92%
 50.17 kg / 110.60 lbs
50169.2 g / 492.2 N
12 mm
100%
 54.73 kg / 120.66 lbs
54730.0 g / 536.9 N
A thin sheet cannot take in the full magnetic flux, which wastes potential of the holder. Should you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To squeeze 100% of this magnet's potential, you need a suitably thick backing of metal. The saturation phenomenon means that on sheet metal structures (e.g., appliance housings), the magnet works worse. We advise picking the steel thickness based on the following data.

Table 5: Thermal stability (material behavior) - power drop
MW 40x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 54.73 kg / 120.66 lbs
54730.0 g / 536.9 N
 OK
40 °C -2.2% 53.53 kg / 118.00 lbs
53525.9 g / 525.1 N
 OK
60 °C -4.4% 52.32 kg / 115.35 lbs
52321.9 g / 513.3 N
 OK
80 °C -6.6% 51.12 kg / 112.70 lbs
51117.8 g / 501.5 N
100 °C -28.8% 38.97 kg / 85.91 lbs
38967.8 g / 382.3 N
Standard neodymium magnets change their properties power past the thermal threshold. Protect against heat – excessive heat can permanently damage this product. With increasing heat, the magnet's capacity temporarily lowers. Do not use this product close to heaters exceeding its working range. Too high temperature will lead to irreversible degradation of magnetic properties.
*Engineering note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Thin magnets (pancake types) risk losing magnetic properties under lower heat stress than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MW 40x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 205.97 kg / 454.08 lbs
5 879 Gs
30.89 kg / 68.11 lbs
30895 g / 303.1 N
 N/A
1 mm 195.99 kg / 432.09 lbs
10 060 Gs
29.40 kg / 64.81 lbs
29399 g / 288.4 N
 176.39 kg / 388.88 lbs
~0 Gs
2 mm 186.03 kg / 410.12 lbs
9 800 Gs
27.90 kg / 61.52 lbs
27904 g / 273.7 N
 167.42 kg / 369.11 lbs
~0 Gs
3 mm 176.30 kg / 388.68 lbs
9 541 Gs
26.45 kg / 58.30 lbs
26445 g / 259.4 N
 158.67 kg / 349.81 lbs
~0 Gs
5 mm 157.67 kg / 347.60 lbs
9 023 Gs
23.65 kg / 52.14 lbs
23650 g / 232.0 N
 141.90 kg / 312.84 lbs
~0 Gs
10 mm 116.59 kg / 257.04 lbs
7 759 Gs
17.49 kg / 38.56 lbs
17489 g / 171.6 N
 104.93 kg / 231.34 lbs
~0 Gs
20 mm 59.56 kg / 131.31 lbs
5 545 Gs
8.93 kg / 19.70 lbs
8934 g / 87.6 N
 53.60 kg / 118.18 lbs
~0 Gs
50 mm 7.52 kg / 16.58 lbs
1 971 Gs
1.13 kg / 2.49 lbs
1128 g / 11.1 N
 6.77 kg / 14.92 lbs
~0 Gs
60 mm 4.05 kg / 8.93 lbs
1 446 Gs
0.61 kg / 1.34 lbs
608 g / 6.0 N
 3.65 kg / 8.04 lbs
~0 Gs
70 mm 2.28 kg / 5.03 lbs
1 085 Gs
0.34 kg / 0.75 lbs
342 g / 3.4 N
 2.05 kg / 4.53 lbs
~0 Gs
80 mm 1.34 kg / 2.96 lbs
832 Gs
0.20 kg / 0.44 lbs
201 g / 2.0 N
 1.21 kg / 2.66 lbs
~0 Gs
90 mm 0.82 kg / 1.80 lbs
650 Gs
0.12 kg / 0.27 lbs
123 g / 1.2 N
 0.74 kg / 1.62 lbs
~0 Gs
100 mm 0.52 kg / 1.14 lbs
517 Gs
0.08 kg / 0.17 lbs
78 g / 0.8 N
 0.47 kg / 1.03 lbs
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and sheet setup. The setup of magnet-to-magnet produces a massive flux and a larger range of operation. Planning to create a powerful holder? Apply two magnets instead of one magnet and a steel. Be careful that when attracting two neodymiums, the collision energy is massive. The levitation is a bit weaker than the connection force, but still large.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Calculations show shear force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
MW 40x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 23.5 cm
Hearing aid 10 Gs (1.0 mT) 18.0 cm
Timepiece 20 Gs (2.0 mT) 14.0 cm
Mobile device 40 Gs (4.0 mT) 11.0 cm
Remote 50 Gs (5.0 mT) 10.0 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm
Powerful magnet radiation is a large risk to electronic devices as well as pacemakers. These magnets produce a flux that destroys function of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and housings. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MW 40x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.09 km/h
(4.75 m/s)
 3.18 J
30 mm 19.68 km/h
(5.47 m/s)
 4.23 J
50 mm 19.88 km/h
(5.52 m/s)
 4.31 J
100 mm 19.92 km/h
(5.53 m/s)
 4.33 J
Magnetic elements are very brittle – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose becomes dangerous. Kinetic force can cause material chips or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
MW 40x30 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MW 40x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 65 488 Mx 654.9 µWb
Pc Coefficient 0.76 High (Stable)
Flux value passing through the pole surface. Key data when building generators as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 40x30 / N38

Environment Effective steel pull Effect
Air (land) 54.73 kg Standard
Water (riverbed) 62.67 kg
(+7.94 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.

1. Sliding resistance

*Caution: On a vertical surface, the magnet holds just a fraction of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.76

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

Technical specification and ecology

Elemental analysis

iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%

Ecology and recycling (GPSR)

recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 010068-2026
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The offered product is an incredibly powerful cylinder magnet, composed of advanced NdFeB material, which, at dimensions of Ø40x30 mm, guarantees optimal power. This specific item features an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 54.73 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 536.88 N with a weight of only 282.74 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø40x30), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 40 mm and height 30 mm. The key parameter here is the lifting capacity amounting to approximately 54.73 kg (force ~536.88 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 30 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths and weaknesses of rare earth magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They have stable power, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to magnetic field loss as a result of external fields,
  • A magnet with a shiny nickel surface has an effective appearance,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of precise modeling as well as adjusting to specific requirements,
  • Huge importance in high-tech industry – they are utilized in mass storage devices, brushless drives, medical equipment, as well as complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Limited possibility of making nuts in the magnet and complex forms - preferred is casing - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these products can disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding force – what affects it?

The load parameter shown represents the maximum value, measured under ideal test conditions, namely:
  • with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a surface perfectly flat
  • without any insulating layer between the magnet and steel
  • under perpendicular force direction (90-degree angle)
  • in stable room temperature

Determinants of lifting force in real conditions

In practice, the actual holding force is determined by many variables, ranked from crucial:
  • Air gap (between the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Angle of force application – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Plate material – mild steel attracts best. Alloy steels lower magnetic properties and holding force.
  • Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage 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 75%. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets
Protect data

Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Implant safety

People with a heart stimulator have to maintain an large gap from magnets. The magnetic field can disrupt the functioning of the implant.

Do not overheat magnets

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

Allergy Warning

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness happens, cease working with magnets and use protective gear.

Magnet fragility

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

Immense force

Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Do not give to children

NdFeB magnets are not suitable for play. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

GPS Danger

Navigation devices and smartphones are extremely sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Physical harm

Danger of trauma: The attraction force is so immense that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

Machining danger

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Attention! Looking for details? Read our article: Are neodymium magnets dangerous?