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MW 20x18 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010040

GTIN/EAN: 5906301810391

Diameter Ø

20 mm [±0,1 mm]

Height

18 mm [±0,1 mm]

Weight

42.41 g

Magnetization Direction

↑ axial

Load capacity

13.19 kg / 129.35 N

Magnetic Induction

541.64 mT / 5416 Gs

Coating

[NiCuNi] Nickel

technical parameters »

23.54 ZŁ with VAT / pcs + price for transport

19.14 ZŁ net + 23% VAT / pcs

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Contact us by phone +48 22 499 98 98 otherwise contact us through form our website.
Parameters and form of neodymium magnets can be tested using our magnetic calculator.

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Product card - MW 20x18 / N38 - cylindrical magnet

Specification / characteristics - MW 20x18 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010040
GTIN/EAN 5906301810391
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 20 mm [±0,1 mm]
Height 18 mm [±0,1 mm]
Weight 42.41 g
Magnetization Direction ↑ axial
Load capacity ~ ? 13.19 kg / 129.35 N
Magnetic Induction ~ ? 541.64 mT / 5416 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x18 / 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 simulation of the product - report

Presented data represent the direct effect of a physical calculation. Results are based on models for the class Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Treat these calculations as a reference point when designing systems.

Table 1: Static pull force (pull vs gap) - interaction chart
MW 20x18 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5414 Gs
541.4 mT
 13.19 kg / 29.08 LBS
13190.0 g / 129.4 N
 critical level
1 mm 4870 Gs
487.0 mT
 10.67 kg / 23.52 LBS
10669.5 g / 104.7 N
 critical level
2 mm 4330 Gs
433.0 mT
 8.43 kg / 18.59 LBS
8434.2 g / 82.7 N
 strong
3 mm 3816 Gs
381.6 mT
 6.55 kg / 14.45 LBS
6552.7 g / 64.3 N
 strong
5 mm 2913 Gs
291.3 mT
 3.82 kg / 8.42 LBS
3818.4 g / 37.5 N
 strong
10 mm 1455 Gs
145.5 mT
 0.95 kg / 2.10 LBS
952.2 g / 9.3 N
 low risk
15 mm 775 Gs
77.5 mT
 0.27 kg / 0.60 LBS
270.1 g / 2.7 N
 low risk
20 mm 450 Gs
45.0 mT
 0.09 kg / 0.20 LBS
91.3 g / 0.9 N
 low risk
30 mm 188 Gs
18.8 mT
 0.02 kg / 0.04 LBS
15.9 g / 0.2 N
 low risk
50 mm 54 Gs
5.4 mT
 0.00 kg / 0.00 LBS
1.3 g / 0.0 N
 low risk
Pulling power drops drastically with every subsequent millimeter of spacing. Remember that even a very thin break (e.g., contamination, varnish, veneer) noticeably weakens the grip. Magnetic products hold strongest during direct contact; gap drastically cuts the power. Observe how quickly the pull force drop, when the product does not touch flatly to the metal substrate. When planning the mounting, discard additional spacers.

Table 2: Slippage hold (wall)
MW 20x18 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.64 kg / 5.82 LBS
2638.0 g / 25.9 N
1 mm Stal (~0.2) 2.13 kg / 4.70 LBS
2134.0 g / 20.9 N
2 mm Stal (~0.2) 1.69 kg / 3.72 LBS
1686.0 g / 16.5 N
3 mm Stal (~0.2) 1.31 kg / 2.89 LBS
1310.0 g / 12.9 N
5 mm Stal (~0.2) 0.76 kg / 1.68 LBS
764.0 g / 7.5 N
10 mm Stal (~0.2) 0.19 kg / 0.42 LBS
190.0 g / 1.9 N
15 mm Stal (~0.2) 0.05 kg / 0.12 LBS
54.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.04 LBS
18.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below calculates the approximate force needed to initiate the downward movement of the magnet vertically along a vertical metal surface (assuming typical friction). This value depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MW 20x18 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.96 kg / 8.72 LBS
3957.0 g / 38.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.64 kg / 5.82 LBS
2638.0 g / 25.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.32 kg / 2.91 LBS
1319.0 g / 12.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.60 kg / 14.54 LBS
6595.0 g / 64.7 N
When mounting a holder on a upright plane (e.g., a fridge), it you can count on barely about 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip influence the fact that magnets move down faster than they detach. Want to create a wall mount? Note that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the holder will slip down under a much lighter load. Application of an anti-slip coating can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 20x18 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.66 kg / 1.45 LBS
659.5 g / 6.5 N
1 mm
13%
 1.65 kg / 3.63 LBS
1648.8 g / 16.2 N
2 mm
25%
 3.30 kg / 7.27 LBS
3297.5 g / 32.3 N
3 mm
38%
 4.95 kg / 10.90 LBS
4946.3 g / 48.5 N
5 mm
63%
 8.24 kg / 18.17 LBS
8243.8 g / 80.9 N
10 mm
100%
 13.19 kg / 29.08 LBS
13190.0 g / 129.4 N
11 mm
100%
 13.19 kg / 29.08 LBS
13190.0 g / 129.4 N
12 mm
100%
 13.19 kg / 29.08 LBS
13190.0 g / 129.4 N
A thin sheet is incapable of absorb the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To utilize 100% of this neodymium's power, you need a suitably thick piece of steel. The saturation effect means that on sheet metal structures (e.g., thin profiles), the product works worse. We suggest choosing the steel thickness based on the following data.

Table 5: Working in heat (material behavior) - resistance threshold
MW 20x18 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 13.19 kg / 29.08 LBS
13190.0 g / 129.4 N
 OK
40 °C -2.2% 12.90 kg / 28.44 LBS
12899.8 g / 126.5 N
 OK
60 °C -4.4% 12.61 kg / 27.80 LBS
12609.6 g / 123.7 N
 OK
80 °C -6.6% 12.32 kg / 27.16 LBS
12319.5 g / 120.9 N
100 °C -28.8% 9.39 kg / 20.70 LBS
9391.3 g / 92.1 N
Classic neodymiums irreversibly lose strength after exceeding the maximum temperature. Protect against heat – high temperature can permanently destroy this magnet. With every degree above norm, the neodymium's capacity briefly drops. Do not use this product in hot environments exceeding its working range. Ignoring the limit will result in destruction of magnetic properties.
*Engineering note: 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 compared to rod magnets. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 20x18 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 56.78 kg / 125.17 LBS
5 968 Gs
8.52 kg / 18.78 LBS
8516 g / 83.5 N
 N/A
1 mm 51.26 kg / 113.01 LBS
10 289 Gs
7.69 kg / 16.95 LBS
7689 g / 75.4 N
 46.13 kg / 101.71 LBS
~0 Gs
2 mm 45.93 kg / 101.25 LBS
9 739 Gs
6.89 kg / 15.19 LBS
6889 g / 67.6 N
 41.33 kg / 91.13 LBS
~0 Gs
3 mm 40.93 kg / 90.24 LBS
9 194 Gs
6.14 kg / 13.54 LBS
6140 g / 60.2 N
 36.84 kg / 81.22 LBS
~0 Gs
5 mm 32.06 kg / 70.68 LBS
8 137 Gs
4.81 kg / 10.60 LBS
4809 g / 47.2 N
 28.86 kg / 63.62 LBS
~0 Gs
10 mm 16.44 kg / 36.24 LBS
5 826 Gs
2.47 kg / 5.44 LBS
2465 g / 24.2 N
 14.79 kg / 32.61 LBS
~0 Gs
20 mm 4.10 kg / 9.04 LBS
2 909 Gs
0.61 kg / 1.36 LBS
615 g / 6.0 N
 3.69 kg / 8.13 LBS
~0 Gs
50 mm 0.15 kg / 0.34 LBS
565 Gs
0.02 kg / 0.05 LBS
23 g / 0.2 N
 0.14 kg / 0.31 LBS
~0 Gs
60 mm 0.07 kg / 0.15 LBS
376 Gs
0.01 kg / 0.02 LBS
10 g / 0.1 N
 0.06 kg / 0.14 LBS
~0 Gs
70 mm 0.03 kg / 0.07 LBS
262 Gs
0.00 kg / 0.01 LBS
5 g / 0.0 N
 0.03 kg / 0.07 LBS
~0 Gs
80 mm 0.02 kg / 0.04 LBS
190 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.03 LBS
~0 Gs
90 mm 0.01 kg / 0.02 LBS
142 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.01 kg / 0.01 LBS
109 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets interact from a wider radius than a magnet and sheet combination. The connection of two magnets generates a stronger field and a larger range of action. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the collision energy is extreme. The levitation is marginally weaker than the attraction, but still significant.
*Field value for N-N configuration reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).
Important: Calculations demonstrate friction force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 20x18 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Timepiece 20 Gs (2.0 mT) 7.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.0 cm
Remote 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Powerful magnet radiation is a serious hazard to electronic devices and pacemakers. These magnets produce a field that destroys function of sensitive medical devices. Be aware: the unseen radiation passes through tissues and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MW 20x18 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.57 km/h
(5.16 m/s)
 0.56 J
30 mm 30.83 km/h
(8.56 m/s)
 1.56 J
50 mm 39.77 km/h
(11.05 m/s)
 2.59 J
100 mm 56.24 km/h
(15.62 m/s)
 5.18 J
NdFeB products are very brittle – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Kinetic force can cause material chips or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the metal. A collision at high speed means shattering of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Coating parameters (durability)
MW 20x18 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MW 20x18 / N38

Parameter Value SI Unit / Description
Magnetic Flux 17 374 Mx 173.7 µWb
Pc Coefficient 0.85 High (Stable)
Flux value emitted by the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MW 20x18 / N38

Environment Effective steel pull Effect
Air (land) 13.19 kg Standard
Water (riverbed) 15.10 kg
(+1.91 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Caution: On a vertical wall, the magnet holds just a fraction of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.85

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
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%
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: 010040-2026
Quick Unit Converter
Force (pull)
Field Strength
Simply complete one field, and the tool fill in the rest for you.

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The presented product is an extremely powerful cylindrical magnet, made from modern NdFeB material, which, at dimensions of Ø20x18 mm, guarantees maximum efficiency. The MW 20x18 / N38 component boasts high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 13.19 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid 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 perfect for building electric motors, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 129.35 N with a weight of only 42.41 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. 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.
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 even stronger magnets in the same volume (Ø20x18), 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 20 mm and height 18 mm. The value of 129.35 N means that the magnet is capable of holding a weight many times exceeding its own mass of 42.41 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 18 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 through the diameter if your project requires it.

Pros as well as cons of Nd2Fe14B magnets.

Advantages

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They do not lose strength, even over around 10 years – the reduction in power is only ~1% (based on measurements),
  • They retain their magnetic properties even under strong external field,
  • In other words, due to the reflective finish of nickel, the element looks attractive,
  • Magnetic induction on the top side of the magnet is very high,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Thanks to versatility in shaping and the capacity to adapt to individual projects,
  • Significant place in high-tech industry – they serve a role in data components, brushless drives, advanced medical instruments, and industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited ability of making threads in the magnet and complicated forms - recommended is cover - magnet mounting.
  • Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small elements of these magnets can be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Highest magnetic holding force – what contributes to it?

The load parameter shown concerns the maximum value, obtained under ideal test conditions, namely:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • with a cross-section minimum 10 mm
  • with a surface perfectly flat
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction perpendicular to the plane
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

Bear in mind that the working load may be lower depending on elements below, in order of importance:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity was measured with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Warning for heart patients

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Magnetic interference

Be aware: rare earth magnets generate a field that disrupts sensitive sensors. Keep a separation from your phone, tablet, and GPS.

Thermal limits

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

Bone fractures

Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Dust explosion hazard

Powder generated during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

Handling guide

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Allergy Warning

A percentage of the population have a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Frequent touching may cause a rash. We strongly advise use protective gloves.

Keep away from children

Strictly store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are tragic.

Threat to electronics

Powerful magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Beware of splinters

NdFeB magnets are sintered ceramics, meaning they are very brittle. Clashing of two magnets will cause them shattering into small pieces.

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