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MW 6x3 zestaw 100 szt. / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010535

GTIN/EAN: 5906301815266

Load capacity 1.15 kg / 11.23 N Magnetic Induction 437.58 mT / 4376 Gs
Diameter Ø
6 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
64 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical specifications »

34.14 zł net / pcs

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Frequently asked questions

Where can I buy strong cylindrical neodymium magnets?
See the available cylinders in the DHIT catalogue. Compare dimensions, grade and the pull-force value on each product card; grade alone does not determine the pull force of a finished magnet.
Can a small cylindrical magnet provide a strong grip for precise workshop work?
Yes, but size alone is not enough to predict the result. Geometry, the steel surface and the direction of load affect the grip. Compare the specifications of the selected dimensions on their product cards.
Which cylindrical magnet can work at a higher temperature?
Check the operating-temperature limit of the particular model rather than assuming one limit for all N grades. The offered N52 models are rated up to 60°C. For hotter applications, ask for a product with a confirmed specification for the actual working temperature.

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 details - MW 6x3 zestaw 100 szt. / N38 - cylindrical magnet

Specification / characteristics - MW 6x3 zestaw 100 szt. / N38 - cylindrical magnet

properties
properties values
Cat. no. 010535
GTIN/EAN 5906301815266
Distributor Dhit sp. z o.o.
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 6 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 64 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.15 kg / 11.23 N
Magnetic Induction ~ ? 437.58 mT / 4376 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 6x3 zestaw 100 szt. / N38 - cylindrical 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

Engineering simulation of the assembly - technical parameters

The following data represent the outcome of a engineering calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs distance) - power drop
MW 6x3 zestaw 100 szt. / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4371 Gs
437.1 mT
 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
 low risk
1 mm 2999 Gs
299.9 mT
 0.54 kg / 1.19 pounds
541.6 g / 5.3 N
 low risk
2 mm 1877 Gs
187.7 mT
 0.21 kg / 0.47 pounds
212.2 g / 2.1 N
 low risk
3 mm 1161 Gs
116.1 mT
 0.08 kg / 0.18 pounds
81.2 g / 0.8 N
 low risk
5 mm 489 Gs
48.9 mT
 0.01 kg / 0.03 pounds
14.4 g / 0.1 N
 low risk
10 mm 103 Gs
10.3 mT
 0.00 kg / 0.00 pounds
0.6 g / 0.0 N
 low risk
15 mm 36 Gs
3.6 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 low risk
20 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Grip strength weakens drastically with every mm of gap. Note that even a very thin break (e.g., contamination, paint, veneer) strongly weakens the grip. Neodymiums operate strongest during direct contact; gap nullifies the power. See how quickly the pull force plummet, when the product does not adhere tightly to the steel surface. When planning the assembly, eliminate additional spacers.

Table 2: Sliding load (vertical surface)
MW 6x3 zestaw 100 szt. / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Raw steel (µ ≈ 0.2) 0.23 kg / 0.51 pounds
230.0 g / 2.3 N
1 mm Raw steel (µ ≈ 0.2) 0.11 kg / 0.24 pounds
108.0 g / 1.1 N
2 mm Raw steel (µ ≈ 0.2) 0.04 kg / 0.09 pounds
42.0 g / 0.4 N
3 mm Raw steel (µ ≈ 0.2) 0.02 kg / 0.04 pounds
16.0 g / 0.2 N
5 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
10 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section shows the estimated holding capacity necessary to cause the shifting of the magnet downwards on a vertical metal surface (assuming typical friction coefficient). The holding force varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 6x3 zestaw 100 szt. / N38

Surface type Friction coefficient / % Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% of nominal force
0.35 kg / 0.76 pounds
345.0 g / 3.4 N
Painted steel (standard)
µ = 0.2 20% of nominal force
0.23 kg / 0.51 pounds
230.0 g / 2.3 N
Oily/slippery steel
µ = 0.1 10% of nominal force
0.11 kg / 0.25 pounds
115.0 g / 1.1 N
Magnet with anti-slip rubber
µ = 0.5 50% of nominal force
0.58 kg / 1.27 pounds
575.0 g / 5.6 N
When mounting a element on a vertical surface (e.g., a board), it you can count on barely approx. 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient mean that holders slide down easier than they pop off the substrate. Want to create a hanger? Note that the sliding force is much weaker than the maximum static pull force. On a painted metal, the element will slide down under a noticeably lighter load. Using a rubber layer can effectively improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MW 6x3 zestaw 100 szt. / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.11 kg / 0.25 pounds
115.0 g / 1.1 N
1 mm
25%
 0.29 kg / 0.63 pounds
287.5 g / 2.8 N
2 mm
50%
 0.58 kg / 1.27 pounds
575.0 g / 5.6 N
3 mm
75%
 0.86 kg / 1.90 pounds
862.5 g / 8.5 N
5 mm
100%
 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
10 mm
100%
 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
11 mm
100%
 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
12 mm
100%
 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
A thin metal plate is not enough to absorb the entire magnetic field, which weakens actual performance of the magnet. Should you attach a powerful product to a thin surface, the flux will pass right through and the holding will be smaller. To utilize full efficiency of this magnet's potential, you need a suitably thick piece of metal. The saturation phenomenon causes that on delicate walls (e.g., car bodies), the product works worse. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal stability (stability) - power drop
MW 6x3 zestaw 100 szt. / N38

Magnet temperature (°C) Force change relative to 20°C Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
 Estimate
40 °C -4.4% 1.10 kg / 2.42 pounds
1100.0 g / 10.8 N
 Estimate
60 °C -8.6% 1.05 kg / 2.32 pounds
1051.0 g / 10.3 N
 Estimate
80 °C -12.8% 1.00 kg / 2.21 pounds
1003.2 g / 9.8 N
 Material limit
100 °C — — Out of range — no model
The table estimates the reversible force change relative to 20°C, assuming a Br coefficient of -0.11%/°C and force proportional to Br². This is a simplified model with unchanged contact and geometry, not a measurement. Above the material limit, neither force nor irreversible magnetization loss is predicted.
The temperature limit comes from this product’s material data. Permissible conditions also depend on geometry and the magnetic circuit. Without B-H curves for the specific grade and temperature, Pc alone does not determine irreversible demagnetization. Values within the material range do not guarantee the allowable temperature of the complete assembly.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 6x3 zestaw 100 szt. / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.33 kg / 7.34 pounds
5 527 Gs
0.50 kg / 1.10 pounds
499 g / 4.9 N
 N/A
1 mm 2.37 kg / 5.23 pounds
7 376 Gs
0.36 kg / 0.78 pounds
356 g / 3.5 N
 2.13 kg / 4.70 pounds
~0 Gs
2 mm 1.57 kg / 3.46 pounds
5 999 Gs
0.24 kg / 0.52 pounds
235 g / 2.3 N
 1.41 kg / 3.11 pounds
~0 Gs
3 mm 0.99 kg / 2.19 pounds
4 772 Gs
0.15 kg / 0.33 pounds
149 g / 1.5 N
 0.89 kg / 1.97 pounds
~0 Gs
5 mm 0.38 kg / 0.83 pounds
2 948 Gs
0.06 kg / 0.13 pounds
57 g / 0.6 N
 0.34 kg / 0.75 pounds
~0 Gs
10 mm 0.04 kg / 0.09 pounds
978 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
205 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
18 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
11 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
7 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
5 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
2 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products attract each other from a much further distance than a neodymium and metal combination. The connection of two magnets generates a stronger field and a wider radius of operation. Planning to create a strong closure? Utilize two neodymiums instead of one magnet and a steel. Be careful that when bringing together two magnets, the pinch force is extreme. The repulsion force is a bit weaker than the attraction, but still large.
*Flux density for N-N configuration is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Attention: Figures apply to friction force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Axial field levels — not safety zones
MW 6x3 zestaw 100 szt. / N38

Field level (Gs) mT Model distance (cm)
< 5 Gs < 0.5 mT 3.5 cm
< 10 Gs < 1.0 mT 2.5 cm
< 20 Gs < 2.0 mT 2.0 cm
< 40 Gs < 4.0 mT 1.5 cm
< 50 Gs < 5.0 mT 1.5 cm
< 400 Gs < 40.0 mT 1.0 cm
< 600 Gs < 60.0 mT 0.5 cm
Reference field levels for a model of one magnet, on its axis in air, with a 5 mm distance step. These are not device immunity limits or safe distances for implants. Do not use this table to assess the safety of a pacemaker, defibrillator or other implant; follow the device manufacturer’s and your clinician’s guidance. Steel and other magnets change the field distribution.

Table 8: Collisions (cracking risk) - collision effects
MW 6x3 zestaw 100 szt. / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 2.37 km/h
(0.66 m/s)
 0.01 J
30 mm 2.37 km/h
(0.66 m/s)
 0.01 J
50 mm 2.37 km/h
(0.66 m/s)
 0.01 J
100 mm 2.37 km/h
(0.66 m/s)
 0.01 J
Magnetic elements are prone to chipping – a strong collision with metal can result in shattering. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can trigger coating fragments or dangerous crushing to fingers. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 6x3 zestaw 100 szt. / 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 6x3 zestaw 100 szt. / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 256 Mx 12.6 µWb
Pc Coefficient 0.59 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications and motors. Pc value defines the working geometry.

Table 11: Physics of underwater searching
MW 6x3 zestaw 100 szt. / N38

Environment Effective steel pull Effect
Air (land) 1.15 kg Standard
Water (riverbed) 1.32 kg
(+0.17 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Shear force

*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Temperature resistance

N38: the maximum material working temperature is 80°C. Permitted conditions also depend on the shape and magnetic circuit.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.59

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

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%

Environmental data

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: 010535-2026
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The presented product is an extremely powerful cylindrical magnet, produced from modern NdFeB material, which, with dimensions of Ø6x3 mm, guarantees the highest energy density. This specific item boasts 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. 1.15 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 11.23 N with a weight of only 64 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 6.1 mm) using epoxy glues. To ensure stability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Choose the material grade together with the dimensions and working conditions. A grade designation alone does not determine the pull force of the finished magnet. Check the properties and working temperature of this specific model on its product card; contact us before ordering for an unusual application.
This model is characterized by dimensions Ø6x3 mm, which, at a weight of 64 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 1.15 kg (force ~11.23 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface 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 6 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.

Advantages as well as disadvantages of neodymium magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
  • Magnets perfectly resist against demagnetization caused by foreign field sources,
  • By using a smooth coating of nickel, the element has an nice look,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • 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...
  • Thanks to the ability of precise molding and customization to unique needs, magnetic components can be manufactured in a variety of shapes and sizes, which amplifies use scope,
  • Wide application in modern technologies – they serve a role in computer drives, electromotive mechanisms, diagnostic systems, and industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Cons of neodymium magnets: tips and applications.
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Do not exceed this material temperature limit: 80°C. Overheating may permanently weaken the magnet.
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex shapes.
  • Potential hazard to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. Furthermore, small elements of these devices can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditions – what affects it?

The lifting capacity listed is a theoretical maximum value performed under specific, ideal conditions:
  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • with a cross-section no less than 10 mm
  • with a surface perfectly flat
  • under conditions of ideal adhesion (surface-to-surface)
  • under perpendicular force vector (90-degree angle)
  • at room temperature

Key elements affecting lifting force

Effective lifting capacity is affected by specific conditions, including (from priority):
  • Air gap (between the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel type – mild steel gives the best results. Alloy steels reduce magnetic permeability and holding force.
  • Surface finish – full contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the load capacity.

H&S for magnets
Handling guide

Use magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and respect their force.

Precision electronics

Note: rare earth magnets produce a field that confuses sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.

Medical implants

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Shattering risk

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

Warning for allergy sufferers

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness occurs, cease working with magnets and wear gloves.

This is not a toy

Neodymium magnets are not suitable for play. Swallowing several magnets may result in them attracting across intestines, which constitutes a severe health hazard and requires immediate surgery.

Do not drill into magnets

Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Electronic hazard

Very strong magnetic fields can erase data on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Physical harm

Danger of trauma: The pulling power is so great that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Thermal limits

Do not exceed the maximum operating temperature stated in the specifications of the particular product. The limit depends on the material, geometry and operating arrangement; there is no single threshold for all neodymium magnets. Overheating can permanently weaken a magnet.

Safety First! More info about hazards in the article: Safety of working with magnets.