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MW 20x2.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010042

GTIN/EAN: 5906301810414

5.00

Diameter Ø

20 mm [±0,1 mm]

Height

2.5 mm [±0,1 mm]

Weight

5.89 g

Magnetization Direction

↑ axial

Load capacity

2.41 kg / 23.63 N

Magnetic Induction

150.34 mT / 1503 Gs

Coating

[NiCuNi] Nickel

product specifications »

3.01 ZŁ with VAT / pcs + price for transport

2.45 ZŁ net + 23% VAT / pcs

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Technical specification - MW 20x2.5 / N38 - cylindrical magnet

Specification / characteristics - MW 20x2.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010042
GTIN/EAN 5906301810414
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 2.5 mm [±0,1 mm]
Weight 5.89 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.41 kg / 23.63 N
Magnetic Induction ~ ? 150.34 mT / 1503 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x2.5 / 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

Technical analysis of the magnet - data

These values represent the outcome of a physical simulation. Results rely on models for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Use these calculations as a supplementary guide for designers.

Table 1: Static force (force vs distance) - interaction chart
MW 20x2.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1503 Gs
150.3 mT
 2.41 kg / 5.31 pounds
2410.0 g / 23.6 N
 strong
1 mm 1431 Gs
143.1 mT
 2.18 kg / 4.82 pounds
2184.9 g / 21.4 N
 strong
2 mm 1328 Gs
132.8 mT
 1.88 kg / 4.15 pounds
1882.0 g / 18.5 N
 low risk
3 mm 1206 Gs
120.6 mT
 1.55 kg / 3.42 pounds
1552.2 g / 15.2 N
 low risk
5 mm 947 Gs
94.7 mT
 0.96 kg / 2.11 pounds
957.1 g / 9.4 N
 low risk
10 mm 457 Gs
45.7 mT
 0.22 kg / 0.49 pounds
223.1 g / 2.2 N
 low risk
15 mm 224 Gs
22.4 mT
 0.05 kg / 0.12 pounds
53.7 g / 0.5 N
 low risk
20 mm 120 Gs
12.0 mT
 0.02 kg / 0.03 pounds
15.4 g / 0.2 N
 low risk
30 mm 44 Gs
4.4 mT
 0.00 kg / 0.00 pounds
2.1 g / 0.0 N
 low risk
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 low risk
Pulling power decreases drastically with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., dirt, varnish, veneer) significantly diminishes the holding power. Neodymiums operate most effectively during direct contact; distance drastically cuts the force. Observe how flashily the load capacity plummet, when the product does not touch tightly to the metal substrate. When calculating the assembly, discard unnecessary gaps.

Table 2: Vertical capacity (wall)
MW 20x2.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.48 kg / 1.06 pounds
482.0 g / 4.7 N
1 mm Stal (~0.2) 0.44 kg / 0.96 pounds
436.0 g / 4.3 N
2 mm Stal (~0.2) 0.38 kg / 0.83 pounds
376.0 g / 3.7 N
3 mm Stal (~0.2) 0.31 kg / 0.68 pounds
310.0 g / 3.0 N
5 mm Stal (~0.2) 0.19 kg / 0.42 pounds
192.0 g / 1.9 N
10 mm Stal (~0.2) 0.04 kg / 0.10 pounds
44.0 g / 0.4 N
15 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data calculates the theoretical shear load sufficient to start the downward movement of the magnet vertically on a upright steel wall (assuming standard friction). This parameter varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MW 20x2.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.72 kg / 1.59 pounds
723.0 g / 7.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.48 kg / 1.06 pounds
482.0 g / 4.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.24 kg / 0.53 pounds
241.0 g / 2.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.21 kg / 2.66 pounds
1205.0 g / 11.8 N
When placing a holder on a vertical plane (e.g., a board), it you can count on just approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip mean that magnets slide down easier than they pop off the substrate. Designing a hanger? Note that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will give way down under a much lighter cargo. Utilizing a rubberized coating can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 20x2.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.24 kg / 0.53 pounds
241.0 g / 2.4 N
1 mm
25%
 0.60 kg / 1.33 pounds
602.5 g / 5.9 N
2 mm
50%
 1.21 kg / 2.66 pounds
1205.0 g / 11.8 N
3 mm
75%
 1.81 kg / 3.98 pounds
1807.5 g / 17.7 N
5 mm
100%
 2.41 kg / 5.31 pounds
2410.0 g / 23.6 N
10 mm
100%
 2.41 kg / 5.31 pounds
2410.0 g / 23.6 N
11 mm
100%
 2.41 kg / 5.31 pounds
2410.0 g / 23.6 N
12 mm
100%
 2.41 kg / 5.31 pounds
2410.0 g / 23.6 N
A thin sheet is unable to take in the entire magnetic field, which wastes potential of the holder. If you mount a strong magnet to a thin surface, the field will pass right through and the attraction force will be weaker. To utilize 100% of this magnet's potential, you require a sufficiently solid backing of metal. The saturation effect means that on delicate walls (e.g., appliance housings), the magnet shows lower pull force. We advise picking the steel cross-section according to the table below.

Table 5: Working in heat (material behavior) - thermal limit
MW 20x2.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.41 kg / 5.31 pounds
2410.0 g / 23.6 N
 OK
40 °C -2.2% 2.36 kg / 5.20 pounds
2357.0 g / 23.1 N
 OK
60 °C -4.4% 2.30 kg / 5.08 pounds
2304.0 g / 22.6 N
80 °C -6.6% 2.25 kg / 4.96 pounds
2250.9 g / 22.1 N
100 °C -28.8% 1.72 kg / 3.78 pounds
1715.9 g / 16.8 N
Standard neodymium magnets change their properties strength after exceeding the maximum temperature. Watch out for overheating – heat can irreversibly demagnetize this product. With every degree above norm, the magnet's capacity momentarily drops. Refrain from using this magnet close to heaters exceeding its safe range. Exceeding the critical threshold will lead to destruction of magnetism.
*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties at lower temperatures than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 20x2.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.38 kg / 9.65 pounds
2 771 Gs
0.66 kg / 1.45 pounds
656 g / 6.4 N
 N/A
1 mm 4.20 kg / 9.25 pounds
2 944 Gs
0.63 kg / 1.39 pounds
629 g / 6.2 N
 3.78 kg / 8.33 pounds
~0 Gs
2 mm 3.97 kg / 8.75 pounds
2 862 Gs
0.60 kg / 1.31 pounds
595 g / 5.8 N
 3.57 kg / 7.87 pounds
~0 Gs
3 mm 3.70 kg / 8.17 pounds
2 766 Gs
0.56 kg / 1.22 pounds
556 g / 5.5 N
 3.33 kg / 7.35 pounds
~0 Gs
5 mm 3.12 kg / 6.88 pounds
2 538 Gs
0.47 kg / 1.03 pounds
468 g / 4.6 N
 2.81 kg / 6.19 pounds
~0 Gs
10 mm 1.74 kg / 3.83 pounds
1 895 Gs
0.26 kg / 0.57 pounds
261 g / 2.6 N
 1.56 kg / 3.45 pounds
~0 Gs
20 mm 0.41 kg / 0.89 pounds
915 Gs
0.06 kg / 0.13 pounds
61 g / 0.6 N
 0.36 kg / 0.80 pounds
~0 Gs
50 mm 0.01 kg / 0.02 pounds
140 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.01 pounds
88 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
58 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
41 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
29 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
22 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 wider radius than a magnet and steel setup. Such a system of magnet-to-magnet produces a massive flux and a wider radius of action. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the collision energy is massive. The levitation is a bit weaker than the connection force, but still large.
*The magnetic induction in repulsion mode drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Note: Estimates show friction force of dual same neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 20x2.5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field poses a real danger to electronic devices and pacemakers. These NdFeB products produce a flux that destroys function of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and housings. Special caution must be taken by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MW 20x2.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.55 km/h
(5.99 m/s)
 0.11 J
30 mm 35.35 km/h
(9.82 m/s)
 0.28 J
50 mm 45.62 km/h
(12.67 m/s)
 0.47 J
100 mm 64.51 km/h
(17.92 m/s)
 0.95 J
Neodymium magnets are delicate – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Kinetic force can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 20x2.5 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MW 20x2.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 996 Mx 60.0 µWb
Pc Coefficient 0.19 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter when building generators as well as sensors. Pc value defines the working geometry.

Table 11: Submerged application
MW 20x2.5 / N38

Environment Effective steel pull Effect
Air (land) 2.41 kg Standard
Water (riverbed) 2.76 kg
(+0.35 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Warning: On a vertical wall, the magnet holds just approx. 20-30% of its nominal pull.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Heat tolerance

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.19

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

Technical specification and ecology
Elemental analysis
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
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: 010042-2026
Measurement Calculator
Magnet pull force
Magnetic Induction
Input a value in a box, to see the remaining units will convert automatically.

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MW 20x2 / N38 - cylindrical magnet

2.08 ZŁ brutto / pcs
This product is a very strong cylinder magnet, composed of advanced NdFeB material, which, at dimensions of Ø20x2.5 mm, guarantees maximum efficiency. The MW 20x2.5 / N38 component is characterized by a tolerance of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 2.41 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 23.63 N with a weight of only 5.89 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 20.1 mm) using epoxy glues. To ensure long-term durability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø20x2.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø20x2.5 mm, which, at a weight of 5.89 g, makes it an element with impressive magnetic energy density. The value of 23.63 N means that the magnet is capable of holding a weight many times exceeding its own mass of 5.89 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 2.5 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 diametrically if your project requires it.

Pros as well as cons of neodymium magnets.

Advantages

Apart from their strong power, neodymium magnets have these key benefits:
  • Their power is maintained, and after around ten years it drops only by ~1% (according to research),
  • Neodymium magnets remain highly resistant to magnetic field loss caused by external field sources,
  • By using a lustrous coating of gold, the element gains an proper look,
  • Magnetic induction on the surface of the magnet turns out to be very high,
  • 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 possibility of precise forming and customization to specialized solutions, neodymium magnets can be manufactured in a variety of geometric configurations, which amplifies use scope,
  • Huge importance in advanced technology sectors – they find application in computer drives, drive modules, medical equipment, also technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Characteristics of disadvantages of neodymium magnets and ways of using them
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • Neodymium magnets decrease their strength 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 recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Due to limitations in realizing nuts and complicated forms in magnets, we propose using a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum magnetic pulling force – what affects it?

Breakaway force was defined for optimal configuration, including:
  • using a sheet made of low-carbon steel, functioning as a magnetic yoke
  • whose thickness is min. 10 mm
  • with a surface perfectly flat
  • without any air gap between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • at room temperature

Lifting capacity in practice – influencing factors

Holding efficiency is affected by specific conditions, such as (from most important):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Alloy admixtures reduce magnetic permeability and holding force.
  • Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets
Data carriers

Device Safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).

Respect the power

Use magnets with awareness. Their powerful strength can shock even experienced users. Stay alert and do not underestimate their power.

Maximum temperature

Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. Damage is permanent.

Compass and GPS

GPS units and mobile phones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.

Fragile material

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets will cause them cracking into small pieces.

Adults only

NdFeB magnets are not intended for children. Eating multiple magnets can lead to them connecting inside the digestive tract, which constitutes a critical condition and necessitates urgent medical intervention.

Machining danger

Drilling and cutting of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Skin irritation risks

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

Medical implants

Warning for patients: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Pinching danger

Large magnets can smash fingers in a fraction of a second. Do not put your hand between two attracting surfaces.

Attention! Details about hazards in the article: Magnet Safety Guide.