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MW 21.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010045

GTIN/EAN: 5906301810445

Diameter Ø

21.9 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

28.25 g

Magnetization Direction

→ diametrical

Load capacity

14.65 kg / 143.71 N

Magnetic Induction

417.89 mT / 4179 Gs

Coating

[NiCuNi] Nickel

technical details »

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Technical data of the product - MW 21.9x10 / N38 - cylindrical magnet

Specification / characteristics - MW 21.9x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010045
GTIN/EAN 5906301810445
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 21.9 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 28.25 g
Magnetization Direction → diametrical
Load capacity ~ ? 14.65 kg / 143.71 N
Magnetic Induction ~ ? 417.89 mT / 4179 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 21.9x10 / 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 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

Engineering analysis of the product - data

The following information represent the result of a physical calculation. Values are based on models for the material Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these data as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - power drop
MW 21.9x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4178 Gs
417.8 mT
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
 dangerous!
1 mm 3830 Gs
383.0 mT
 12.31 kg / 27.15 pounds
12314.7 g / 120.8 N
 dangerous!
2 mm 3466 Gs
346.6 mT
 10.08 kg / 22.23 pounds
10083.5 g / 98.9 N
 dangerous!
3 mm 3104 Gs
310.4 mT
 8.09 kg / 17.83 pounds
8086.3 g / 79.3 N
 medium risk
5 mm 2432 Gs
243.2 mT
 4.97 kg / 10.95 pounds
4966.5 g / 48.7 N
 medium risk
10 mm 1257 Gs
125.7 mT
 1.33 kg / 2.93 pounds
1327.0 g / 13.0 N
 low risk
15 mm 671 Gs
67.1 mT
 0.38 kg / 0.83 pounds
378.5 g / 3.7 N
 low risk
20 mm 386 Gs
38.6 mT
 0.13 kg / 0.28 pounds
125.0 g / 1.2 N
 low risk
30 mm 156 Gs
15.6 mT
 0.02 kg / 0.04 pounds
20.4 g / 0.2 N
 low risk
50 mm 43 Gs
4.3 mT
 0.00 kg / 0.00 pounds
1.5 g / 0.0 N
 low risk
Magnetic force drops sharply with every subsequent millimeter of spacing. Note that even the smallest gap (e.g., contamination, paint, dust) significantly diminishes the holding power. Neodymiums work optimally in perfect adhesion; distance weakens the force. Observe how quickly the parameters fall, when the product does not adhere tightly to the metal substrate. When designing the mounting, avoid unnecessary gaps.

Table 2: Vertical hold (vertical surface)
MW 21.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.93 kg / 6.46 pounds
2930.0 g / 28.7 N
1 mm Stal (~0.2) 2.46 kg / 5.43 pounds
2462.0 g / 24.2 N
2 mm Stal (~0.2) 2.02 kg / 4.44 pounds
2016.0 g / 19.8 N
3 mm Stal (~0.2) 1.62 kg / 3.57 pounds
1618.0 g / 15.9 N
5 mm Stal (~0.2) 0.99 kg / 2.19 pounds
994.0 g / 9.8 N
10 mm Stal (~0.2) 0.27 kg / 0.59 pounds
266.0 g / 2.6 N
15 mm Stal (~0.2) 0.08 kg / 0.17 pounds
76.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 pounds
26.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below indicates the estimated shear load sufficient to cause the downward movement of the magnet downwards on a upright steel wall (considering standard friction coefficient). This parameter is a function of the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MW 21.9x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.40 kg / 9.69 pounds
4395.0 g / 43.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.93 kg / 6.46 pounds
2930.0 g / 28.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.47 kg / 3.23 pounds
1465.0 g / 14.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.33 kg / 16.15 pounds
7325.0 g / 71.9 N
When hanging a element on a vertical wall (e.g., a fridge), it will maintain only about 20%-30% of its nominal power. Gravity as well as a weak degree of grip cause that holders move down faster than they detach. Want to create a wall mount? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will slide down under a significantly smaller load. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Steel thickness (saturation) - power losses
MW 21.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.73 kg / 1.61 pounds
732.5 g / 7.2 N
1 mm
13%
 1.83 kg / 4.04 pounds
1831.3 g / 18.0 N
2 mm
25%
 3.66 kg / 8.07 pounds
3662.5 g / 35.9 N
3 mm
38%
 5.49 kg / 12.11 pounds
5493.8 g / 53.9 N
5 mm
63%
 9.16 kg / 20.19 pounds
9156.3 g / 89.8 N
10 mm
100%
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
11 mm
100%
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
12 mm
100%
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
A too thin steel cannot conduct the entire magnetic field, which squanders power of the magnet. If you mount a strong magnet to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To utilize 100% of this magnet's power, you need a suitably thick element of metal. The material oversaturation means that on thin elements (e.g., thin profiles), the product shows lower pull force. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal stability (stability) - resistance threshold
MW 21.9x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
 OK
40 °C -2.2% 14.33 kg / 31.59 pounds
14327.7 g / 140.6 N
 OK
60 °C -4.4% 14.01 kg / 30.88 pounds
14005.4 g / 137.4 N
80 °C -6.6% 13.68 kg / 30.17 pounds
13683.1 g / 134.2 N
100 °C -28.8% 10.43 kg / 23.00 pounds
10430.8 g / 102.3 N
Classic neodymiums change their properties power after exceeding the maximum temperature. Watch out for overheating – high temperature can permanently demagnetize this magnet. With increasing heat, the neodymium's force temporarily lowers. Refrain from using this magnet close to ovens exceeding its operating temperature limit. Too high temperature will result in permanent loss of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (pancake types) are more susceptible to demagnetization sooner than taller cylinders. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 21.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 40.53 kg / 89.35 pounds
5 433 Gs
6.08 kg / 13.40 pounds
6079 g / 59.6 N
 N/A
1 mm 37.31 kg / 82.26 pounds
8 017 Gs
5.60 kg / 12.34 pounds
5597 g / 54.9 N
 33.58 kg / 74.03 pounds
~0 Gs
2 mm 34.07 kg / 75.11 pounds
7 660 Gs
5.11 kg / 11.27 pounds
5110 g / 50.1 N
 30.66 kg / 67.60 pounds
~0 Gs
3 mm 30.92 kg / 68.16 pounds
7 297 Gs
4.64 kg / 10.22 pounds
4637 g / 45.5 N
 27.82 kg / 61.34 pounds
~0 Gs
5 mm 25.04 kg / 55.20 pounds
6 567 Gs
3.76 kg / 8.28 pounds
3756 g / 36.8 N
 22.54 kg / 49.68 pounds
~0 Gs
10 mm 13.74 kg / 30.29 pounds
4 865 Gs
2.06 kg / 4.54 pounds
2061 g / 20.2 N
 12.37 kg / 27.26 pounds
~0 Gs
20 mm 3.67 kg / 8.09 pounds
2 515 Gs
0.55 kg / 1.21 pounds
551 g / 5.4 N
 3.30 kg / 7.28 pounds
~0 Gs
50 mm 0.13 kg / 0.29 pounds
476 Gs
0.02 kg / 0.04 pounds
20 g / 0.2 N
 0.12 kg / 0.26 pounds
~0 Gs
60 mm 0.06 kg / 0.12 pounds
312 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.11 pounds
~0 Gs
70 mm 0.03 kg / 0.06 pounds
214 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
80 mm 0.01 kg / 0.03 pounds
153 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
90 mm 0.01 kg / 0.02 pounds
113 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.01 pounds
86 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a much further distance than a neodymium and metal setup. The setup of two magnets creates a more powerful interaction and a further horizon of operation. Planning to create a strong closure? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the collision energy is massive. The levitation is slightly lower than the connection force, but still large.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Note: Results apply to shear force of dual same neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
MW 21.9x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.0 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Car key 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Extremely neodym field poses a real danger to electronic devices as well as pacemakers. These NdFeB products produce a field that prevents correct functioning of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MW 21.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.23 km/h
(6.73 m/s)
 0.64 J
30 mm 39.81 km/h
(11.06 m/s)
 1.73 J
50 mm 51.36 km/h
(14.27 m/s)
 2.87 J
100 mm 72.63 km/h
(20.17 m/s)
 5.75 J
NdFeB products are very brittle – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Coating parameters (durability)
MW 21.9x10 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MW 21.9x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 059 Mx 160.6 µWb
Pc Coefficient 0.55 Low (Flat)
Flux value passing through the magnet pole. Essential parameter in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Submerged application
MW 21.9x10 / N38

Environment Effective steel pull Effect
Air (land) 14.65 kg Standard
Water (riverbed) 16.77 kg
(+2.12 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.55

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.

Engineering data and GPSR
Material specification
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: 010045-2026
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This product is a very strong cylinder magnet, produced from modern NdFeB material, which, with dimensions of Ø21.9x10 mm, guarantees optimal power. The MW 21.9x10 / N38 component boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 14.65 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 143.71 N with a weight of only 28.25 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø21.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø21.9x10 mm, which, at a weight of 28.25 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 14.65 kg (force ~143.71 N), which, with such defined dimensions, proves the high grade 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 21.9 mm. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Advantages and disadvantages of Nd2Fe14B magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain magnetic properties for nearly ten years – the drop is just ~1% (based on simulations),
  • They retain their magnetic properties even under close interference source,
  • By using a lustrous layer of silver, the element presents an aesthetic look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to freedom in shaping and the ability to customize to individual projects,
  • Fundamental importance in modern technologies – they find application in hard drives, electric drive systems, precision medical tools, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in compact constructions

Cons

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets can complicate diagnosis medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Lifting parameters

Best holding force of the magnet in ideal parameters – what affects it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, including:
  • with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
  • possessing a massiveness of min. 10 mm to avoid saturation
  • characterized by even structure
  • with zero gap (no impurities)
  • during pulling in a direction vertical to the mounting surface
  • at ambient temperature room level

What influences lifting capacity in practice

It is worth knowing that the magnet holding may be lower subject to the following factors, starting with the most relevant:
  • Air gap (between the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Metal Allergy

A percentage of the population experience a contact allergy to nickel, which is the common plating for neodymium magnets. Prolonged contact might lead to skin redness. We strongly advise use protective gloves.

Finger safety

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

GPS Danger

A strong magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets close to a smartphone to prevent damaging the sensors.

Heat warning

Avoid heat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Conscious usage

Be careful. Neodymium magnets act from a long distance and connect with huge force, often quicker than you can react.

Keep away from computers

Device Safety: Strong magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Dust is flammable

Dust created during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Danger to the youngest

These products are not toys. Accidental ingestion of multiple magnets can lead to them attracting across intestines, which poses a direct threat to life and necessitates immediate surgery.

Shattering risk

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Danger to pacemakers

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

Danger! Learn more about hazards in the article: Magnet Safety Guide.