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MW 40x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010067

GTIN/EAN: 5906301810667

Load capacity 42.64 kg / 418.33 N Magnetic Induction 371.91 mT / 3719 Gs
Diameter Ø
40 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
141.37 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see technical data »

53.60 zł net / pcs

65.93 zł with VAT (23% VAT) / pcs

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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

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 - MW 40x15 / N38 - cylindrical magnet

Specification / characteristics - MW 40x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010067
GTIN/EAN 5906301810667
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 15 mm [±0,1 mm]
Weight 141.37 g
Magnetization Direction ↑ axial
Load capacity ~ ? 42.64 kg / 418.33 N
Magnetic Induction ~ ? 371.91 mT / 3719 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x15 / 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 product - data

These data are the outcome of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - power drop
MW 40x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3718 Gs
371.8 mT
 42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
 crushing
1 mm 3563 Gs
356.3 mT
 39.16 kg / 86.33 lbs
39159.5 g / 384.2 N
 crushing
2 mm 3398 Gs
339.8 mT
 35.62 kg / 78.52 lbs
35617.1 g / 349.4 N
 crushing
3 mm 3228 Gs
322.8 mT
 32.13 kg / 70.84 lbs
32130.5 g / 315.2 N
 crushing
5 mm 2880 Gs
288.0 mT
 25.58 kg / 56.40 lbs
25584.2 g / 251.0 N
 crushing
10 mm 2069 Gs
206.9 mT
 13.20 kg / 29.09 lbs
13196.7 g / 129.5 N
 crushing
15 mm 1439 Gs
143.9 mT
 6.38 kg / 14.07 lbs
6383.1 g / 62.6 N
 medium risk
20 mm 999 Gs
99.9 mT
 3.08 kg / 6.79 lbs
3077.9 g / 30.2 N
 medium risk
30 mm 507 Gs
50.7 mT
 0.79 kg / 1.75 lbs
792.4 g / 7.8 N
 low risk
50 mm 169 Gs
16.9 mT
 0.09 kg / 0.19 lbs
88.4 g / 0.9 N
 low risk
Magnetic force drops sharply per each millimeter of gap. Remember that even a very thin break (e.g., contamination, varnish, dust) noticeably diminishes the holding power. Magnets work optimally during direct contact; gap nullifies the power. Notice how rapidly the parameters drop, when the product does not touch tightly to the metal substrate. When designing the mounting, eliminate redundant distances.

Table 2: Vertical force (vertical surface)
MW 40x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 8.53 kg / 18.80 lbs
8528.0 g / 83.7 N
1 mm Stal (~0.2) 7.83 kg / 17.27 lbs
7832.0 g / 76.8 N
2 mm Stal (~0.2) 7.12 kg / 15.71 lbs
7124.0 g / 69.9 N
3 mm Stal (~0.2) 6.43 kg / 14.17 lbs
6426.0 g / 63.0 N
5 mm Stal (~0.2) 5.12 kg / 11.28 lbs
5116.0 g / 50.2 N
10 mm Stal (~0.2) 2.64 kg / 5.82 lbs
2640.0 g / 25.9 N
15 mm Stal (~0.2) 1.28 kg / 2.81 lbs
1276.0 g / 12.5 N
20 mm Stal (~0.2) 0.62 kg / 1.36 lbs
616.0 g / 6.0 N
30 mm Stal (~0.2) 0.16 kg / 0.35 lbs
158.0 g / 1.5 N
50 mm Stal (~0.2) 0.02 kg / 0.04 lbs
18.0 g / 0.2 N
This section presents the estimated holding capacity necessary to initiate the downward movement of the magnet downwards on a upright metal surface (considering standard friction). This value is a function of the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 40x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
12.79 kg / 28.20 lbs
12792.0 g / 125.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.53 kg / 18.80 lbs
8528.0 g / 83.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.26 kg / 9.40 lbs
4264.0 g / 41.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
21.32 kg / 47.00 lbs
21320.0 g / 209.1 N
When placing a magnet on a upright wall (e.g., a board), it will maintain only about 1/5 of its nominal power. Gravitational force and a weak degree of grip influence the fact that products slip faster than they detach. Want to create a hanger? Remember that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the holder will slide down under a much lighter weight. Application of an anti-slip pad can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MW 40x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 2.13 kg / 4.70 lbs
2132.0 g / 20.9 N
1 mm
13%
 5.33 kg / 11.75 lbs
5330.0 g / 52.3 N
2 mm
25%
 10.66 kg / 23.50 lbs
10660.0 g / 104.6 N
3 mm
38%
 15.99 kg / 35.25 lbs
15990.0 g / 156.9 N
5 mm
63%
 26.65 kg / 58.75 lbs
26650.0 g / 261.4 N
10 mm
100%
 42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
11 mm
100%
 42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
12 mm
100%
 42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
A thin sheet cannot conduct the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a weak sheet, the magnetism will pass right through and the holding will be smaller. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid element of metal. The saturation effect means that on sheet metal structures (e.g., thin profiles), the holder works worse. We advise picking the steel thickness based on the following data.

Table 5: Thermal stability (material behavior) - resistance threshold
MW 40x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
 OK
40 °C -2.2% 41.70 kg / 91.94 lbs
41701.9 g / 409.1 N
 OK
60 °C -4.4% 40.76 kg / 89.87 lbs
40763.8 g / 399.9 N
80 °C -6.6% 39.83 kg / 87.80 lbs
39825.8 g / 390.7 N
100 °C -28.8% 30.36 kg / 66.93 lbs
30359.7 g / 297.8 N
Standard neodymium magnets lose parameters after exceeding the maximum temperature. Protect against heat – high temperature can permanently damage this product. As the temperature rises, the magnet's capacity temporarily decreases. Refrain from using this product near heat sources exceeding its safe range. Ignoring the limit will result in permanent loss of magnetism.
*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 40x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 107.12 kg / 236.16 lbs
5 156 Gs
16.07 kg / 35.42 lbs
16068 g / 157.6 N
 N/A
1 mm 102.82 kg / 226.67 lbs
7 286 Gs
15.42 kg / 34.00 lbs
15422 g / 151.3 N
 92.53 kg / 204.00 lbs
~0 Gs
2 mm 98.38 kg / 216.89 lbs
7 127 Gs
14.76 kg / 32.53 lbs
14757 g / 144.8 N
 88.54 kg / 195.20 lbs
~0 Gs
3 mm 93.92 kg / 207.06 lbs
6 964 Gs
14.09 kg / 31.06 lbs
14088 g / 138.2 N
 84.53 kg / 186.36 lbs
~0 Gs
5 mm 85.07 kg / 187.55 lbs
6 627 Gs
12.76 kg / 28.13 lbs
12760 g / 125.2 N
 76.56 kg / 168.79 lbs
~0 Gs
10 mm 64.27 kg / 141.70 lbs
5 761 Gs
9.64 kg / 21.25 lbs
9641 g / 94.6 N
 57.85 kg / 127.53 lbs
~0 Gs
20 mm 33.15 kg / 73.09 lbs
4 137 Gs
4.97 kg / 10.96 lbs
4973 g / 48.8 N
 29.84 kg / 65.78 lbs
~0 Gs
50 mm 3.84 kg / 8.47 lbs
1 408 Gs
0.58 kg / 1.27 lbs
576 g / 5.7 N
 3.46 kg / 7.62 lbs
~0 Gs
60 mm 1.99 kg / 4.39 lbs
1 014 Gs
0.30 kg / 0.66 lbs
299 g / 2.9 N
 1.79 kg / 3.95 lbs
~0 Gs
70 mm 1.08 kg / 2.38 lbs
747 Gs
0.16 kg / 0.36 lbs
162 g / 1.6 N
 0.97 kg / 2.14 lbs
~0 Gs
80 mm 0.61 kg / 1.35 lbs
563 Gs
0.09 kg / 0.20 lbs
92 g / 0.9 N
 0.55 kg / 1.22 lbs
~0 Gs
90 mm 0.36 kg / 0.80 lbs
432 Gs
0.05 kg / 0.12 lbs
54 g / 0.5 N
 0.33 kg / 0.72 lbs
~0 Gs
100 mm 0.22 kg / 0.49 lbs
339 Gs
0.03 kg / 0.07 lbs
33 g / 0.3 N
 0.20 kg / 0.44 lbs
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and steel combination. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Designing a powerful holder? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The repulsion force is marginally weaker than the attraction, but still impressive.
*Flux density in repulsion mode reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
* Results refer to sliding force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
MW 40x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 19.0 cm
Hearing aid 10 Gs (1.0 mT) 15.0 cm
Timepiece 20 Gs (2.0 mT) 11.5 cm
Mobile device 40 Gs (4.0 mT) 9.0 cm
Car key 50 Gs (5.0 mT) 8.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
A strong magnetic field poses a serious hazard to IT equipment as well as pacemakers. These NdFeB products produce a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field acts through matter and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MW 40x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.80 km/h
(6.05 m/s)
 2.59 J
30 mm 25.11 km/h
(6.97 m/s)
 3.44 J
50 mm 25.32 km/h
(7.03 m/s)
 3.50 J
100 mm 25.36 km/h
(7.04 m/s)
 3.51 J
Neodymium magnets are very brittle – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or injury to fingers. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Surface protection spec
MW 40x15 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MW 40x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 48 650 Mx 486.5 µWb
Pc Coefficient 0.48 Low (Flat)
Total magnetic flux emitted by the pole surface. Key data for generator designers and motors. Pc value determines the working geometry.

Table 11: Submerged application
MW 40x15 / N38

Environment Effective steel pull Effect
Air (land) 42.64 kg Standard
Water (riverbed) 48.82 kg
(+6.18 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. However, remember the water resistance when pulling the rope quickly.

1. Shear force

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

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48

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

Technical and environmental data

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%

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: 010067-2026
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This product is an extremely powerful cylindrical magnet, composed of modern NdFeB material, which, with dimensions of Ø40x15 mm, guarantees optimal power. This specific item features high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 42.64 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in standard 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 418.33 N with a weight of only 141.37 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 40.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø40x15), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 40 mm and height 15 mm. The value of 418.33 N means that the magnet is capable of holding a weight many times exceeding its own mass of 141.37 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 40 mm. 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.

Pros and cons of rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
  • Neodymium magnets prove to be highly resistant to magnetic field loss caused by external interference,
  • In other words, due to the glossy finish of silver, the element gains visual value,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
  • 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 precise modeling as well as optimizing to concrete requirements,
  • Wide application in innovative solutions – they are commonly used in magnetic memories, motor assemblies, precision medical tools, also multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose 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 durability even at temperatures up to 230°C
  • 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 creating nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small components of these devices can disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

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

Magnet power was defined for optimal configuration, including:
  • using a base made of high-permeability steel, acting as a circuit closing element
  • with a cross-section of at least 10 mm
  • with an polished touching surface
  • under conditions of no distance (metal-to-metal)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Lifting capacity in real conditions – factors

In practice, the actual holding force results from a number of factors, listed from the most important:
  • Air gap (betwixt the magnet and the metal), as even a very small distance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures lower magnetic permeability and holding force.
  • Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets
Pacemakers

Individuals with a heart stimulator must keep an large gap from magnets. The magnetism can stop the functioning of the implant.

Risk of cracking

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

This is not a toy

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

Safe operation

Handle magnets consciously. Their immense force can shock even experienced users. Be vigilant and respect their force.

Metal Allergy

It is widely known that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, refrain from direct skin contact and select coated magnets.

Fire risk

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Pinching danger

Large magnets can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Cards and drives

Do not bring magnets close to a purse, computer, or screen. The magnetism can permanently damage these devices and wipe information from cards.

Power loss in heat

Do not overheat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).

Magnetic interference

Navigation devices and mobile phones are highly sensitive to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

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