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MW 70x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010096

GTIN/EAN: 5906301810957

5.00
Load capacity 144.18 kg / 1414.37 N Magnetic Induction 403.43 mT / 4034 Gs
Diameter Ø
70 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
865.9 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical details »

257.86 zł net / pcs

317.17 zł with VAT (23% VAT) / pcs

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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.

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Technical of the product - MW 70x30 / N38 - cylindrical magnet

Specification / characteristics - MW 70x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010096
GTIN/EAN 5906301810957
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 70 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 865.9 g
Magnetization Direction ↑ axial
Load capacity ~ ? 144.18 kg / 1414.37 N
Magnetic Induction ~ ? 403.43 mT / 4034 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 70x30 / 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 magnet - data

Presented values constitute the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MW 70x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4034 Gs
403.4 mT
 144.18 kg / 317.86 LBS
144180.0 g / 1414.4 N
 critical level
1 mm 3934 Gs
393.4 mT
 137.11 kg / 302.27 LBS
137108.9 g / 1345.0 N
 critical level
2 mm 3830 Gs
383.0 mT
 129.96 kg / 286.52 LBS
129962.6 g / 1274.9 N
 critical level
3 mm 3724 Gs
372.4 mT
 122.86 kg / 270.87 LBS
122863.7 g / 1205.3 N
 critical level
5 mm 3507 Gs
350.7 mT
 108.99 kg / 240.28 LBS
108989.8 g / 1069.2 N
 critical level
10 mm 2963 Gs
296.3 mT
 77.77 kg / 171.46 LBS
77773.1 g / 763.0 N
 critical level
15 mm 2452 Gs
245.2 mT
 53.26 kg / 117.41 LBS
53257.6 g / 522.5 N
 critical level
20 mm 2003 Gs
200.3 mT
 35.55 kg / 78.38 LBS
35554.2 g / 348.8 N
 critical level
30 mm 1321 Gs
132.1 mT
 15.45 kg / 34.06 LBS
15450.6 g / 151.6 N
 critical level
50 mm 601 Gs
60.1 mT
 3.20 kg / 7.05 LBS
3199.7 g / 31.4 N
 strong
Pulling power weakens sharply with every subsequent millimeter of distance. Keep in mind that every additional insulation layer (e.g., dirt, paint, rust) noticeably weakens the grip. Neodymiums work optimally in perfect adhesion; air break weakens the force. Analyze how rapidly the load capacity plummet, when the product does not touch flatly to the steel surface. When designing the mounting, eliminate unnecessary gaps.

Table 2: Sliding hold (vertical surface)
MW 70x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 28.84 kg / 63.57 LBS
28836.0 g / 282.9 N
1 mm Stal (~0.2) 27.42 kg / 60.46 LBS
27422.0 g / 269.0 N
2 mm Stal (~0.2) 25.99 kg / 57.30 LBS
25992.0 g / 255.0 N
3 mm Stal (~0.2) 24.57 kg / 54.17 LBS
24572.0 g / 241.1 N
5 mm Stal (~0.2) 21.80 kg / 48.06 LBS
21798.0 g / 213.8 N
10 mm Stal (~0.2) 15.55 kg / 34.29 LBS
15554.0 g / 152.6 N
15 mm Stal (~0.2) 10.65 kg / 23.48 LBS
10652.0 g / 104.5 N
20 mm Stal (~0.2) 7.11 kg / 15.67 LBS
7110.0 g / 69.7 N
30 mm Stal (~0.2) 3.09 kg / 6.81 LBS
3090.0 g / 30.3 N
50 mm Stal (~0.2) 0.64 kg / 1.41 LBS
640.0 g / 6.3 N
This section defines the theoretical holding capacity necessary to initiate the slippage of the magnet downwards on a vertical steel wall (considering typical friction coefficient). This value is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MW 70x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
43.25 kg / 95.36 LBS
43254.0 g / 424.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
28.84 kg / 63.57 LBS
28836.0 g / 282.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
14.42 kg / 31.79 LBS
14418.0 g / 141.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
72.09 kg / 158.93 LBS
72090.0 g / 707.2 N
When hanging a element on a vertical wall (e.g., a fridge), it will only hold just about 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient influence the fact that holders slip faster than they pull off. Want to create a hanger? Consider that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the holder will give way down under a significantly smaller weight. Application of an anti-slip pad can drastically improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 70x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 4.81 kg / 10.60 LBS
4806.0 g / 47.1 N
1 mm
8%
 12.01 kg / 26.49 LBS
12015.0 g / 117.9 N
2 mm
17%
 24.03 kg / 52.98 LBS
24030.0 g / 235.7 N
3 mm
25%
 36.05 kg / 79.47 LBS
36045.0 g / 353.6 N
5 mm
42%
 60.08 kg / 132.44 LBS
60075.0 g / 589.3 N
10 mm
83%
 120.15 kg / 264.89 LBS
120150.0 g / 1178.7 N
11 mm
92%
 132.17 kg / 291.37 LBS
132165.0 g / 1296.5 N
12 mm
100%
 144.18 kg / 317.86 LBS
144180.0 g / 1414.4 N
A thin metal plate cannot take in the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the attraction force will be weaker. To utilize the maximum of this magnet's power, you require a sufficiently solid backing of metal. The saturation effect causes that on delicate walls (e.g., appliance housings), the holder works worse. We advise picking the steel dimension according to the table below.

Table 5: Thermal stability (stability) - power drop
MW 70x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 144.18 kg / 317.86 LBS
144180.0 g / 1414.4 N
 OK
40 °C -2.2% 141.01 kg / 310.87 LBS
141008.0 g / 1383.3 N
 OK
60 °C -4.4% 137.84 kg / 303.88 LBS
137836.1 g / 1352.2 N
80 °C -6.6% 134.66 kg / 296.88 LBS
134664.1 g / 1321.1 N
100 °C -28.8% 102.66 kg / 226.32 LBS
102656.2 g / 1007.1 N
Ordinary NdFeB products lose strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently demagnetize this product. As the temperature rises, the magnet's power momentarily drops. Avoid using this product close to ovens higher than its safe range. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.
*Engineering note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) risk losing magnetic properties under lower heat stress than taller cylinders. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MW 70x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 386.08 kg / 851.15 LBS
5 354 Gs
57.91 kg / 127.67 LBS
57911 g / 568.1 N
 N/A
1 mm 376.71 kg / 830.51 LBS
7 969 Gs
56.51 kg / 124.58 LBS
56507 g / 554.3 N
 339.04 kg / 747.46 LBS
~0 Gs
2 mm 367.14 kg / 809.41 LBS
7 867 Gs
55.07 kg / 121.41 LBS
55071 g / 540.2 N
 330.43 kg / 728.47 LBS
~0 Gs
3 mm 357.57 kg / 788.30 LBS
7 764 Gs
53.63 kg / 118.24 LBS
53635 g / 526.2 N
 321.81 kg / 709.47 LBS
~0 Gs
5 mm 338.48 kg / 746.21 LBS
7 554 Gs
50.77 kg / 111.93 LBS
50772 g / 498.1 N
 304.63 kg / 671.59 LBS
~0 Gs
10 mm 291.85 kg / 643.41 LBS
7 014 Gs
43.78 kg / 96.51 LBS
43777 g / 429.5 N
 262.66 kg / 579.07 LBS
~0 Gs
20 mm 208.26 kg / 459.13 LBS
5 925 Gs
31.24 kg / 68.87 LBS
31238 g / 306.4 N
 187.43 kg / 413.21 LBS
~0 Gs
50 mm 62.81 kg / 138.47 LBS
3 254 Gs
9.42 kg / 20.77 LBS
9421 g / 92.4 N
 56.53 kg / 124.62 LBS
~0 Gs
60 mm 41.37 kg / 91.21 LBS
2 641 Gs
6.21 kg / 13.68 LBS
6206 g / 60.9 N
 37.24 kg / 82.09 LBS
~0 Gs
70 mm 27.41 kg / 60.43 LBS
2 150 Gs
4.11 kg / 9.06 LBS
4112 g / 40.3 N
 24.67 kg / 54.39 LBS
~0 Gs
80 mm 18.35 kg / 40.46 LBS
1 759 Gs
2.75 kg / 6.07 LBS
2753 g / 27.0 N
 16.52 kg / 36.41 LBS
~0 Gs
90 mm 12.45 kg / 27.44 LBS
1 449 Gs
1.87 kg / 4.12 LBS
1867 g / 18.3 N
 11.20 kg / 24.70 LBS
~0 Gs
100 mm 8.57 kg / 18.89 LBS
1 202 Gs
1.29 kg / 2.83 LBS
1285 g / 12.6 N
 7.71 kg / 17.00 LBS
~0 Gs
Two magnets interact from a wider radius than a magnet and sheet setup. The setup of two magnets creates a more powerful interaction and a wider radius of performance. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the pinch force is massive. The levitation is slightly lower than the connection force, but still large.
*Flux density for N-N configuration reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Important: Results show shear force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
MW 70x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 34.5 cm
Hearing aid 10 Gs (1.0 mT) 27.0 cm
Mechanical watch 20 Gs (2.0 mT) 21.0 cm
Mobile device 40 Gs (4.0 mT) 16.5 cm
Remote 50 Gs (5.0 mT) 15.0 cm
Payment card 400 Gs (40.0 mT) 6.5 cm
HDD hard drive 600 Gs (60.0 mT) 5.5 cm
A strong magnetic field poses a large risk to electronic devices as well as medical implants. These neodymiums generate a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation penetrates the body and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
MW 70x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.95 km/h
(4.99 m/s)
 10.76 J
30 mm 23.51 km/h
(6.53 m/s)
 18.46 J
50 mm 24.45 km/h
(6.79 m/s)
 19.97 J
100 mm 24.72 km/h
(6.87 m/s)
 20.42 J
Magnetic elements are very brittle – a collision with steel causes immediate chipping. Control the attraction moment – a neodymium left loose becomes dangerous. Impact energy can cause material chips or injury to fingers. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Anti-corrosion coating durability
MW 70x30 / 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 (Flux)
MW 70x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 159 225 Mx 1592.3 µWb
Pc Coefficient 0.53 Low (Flat)
Flux value passing through the magnet pole. Essential parameter in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MW 70x30 / N38

Environment Effective steel pull Effect
Air (land) 144.18 kg Standard
Water (riverbed) 165.09 kg
(+20.91 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

1. Vertical hold

*Caution: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely limits 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) = 0.53

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%

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: 010096-2026
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The offered product is an extremely powerful cylindrical magnet, produced from durable NdFeB material, which, with dimensions of Ø70x30 mm, guarantees the highest energy density. This specific item is characterized by high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 144.18 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 1414.37 N with a weight of only 865.9 g, this rod is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 70.1 mm) using epoxy glues. To ensure stability in automation, specialized industrial adhesives 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 extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø70x30), 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 70 mm and height 30 mm. The value of 1414.37 N means that the magnet is capable of holding a weight many times exceeding its own mass of 865.9 g. 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 70 mm. Such an arrangement is most desirable 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 through the diameter if your project requires it.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under external field action,
  • In other words, due to the shiny finish of nickel, the element gains visual value,
  • Magnets are characterized by maximum magnetic induction on the outer side,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to flexibility in constructing and the ability to customize to specific needs,
  • Significant place in high-tech industry – they are commonly used in computer drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their power 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 stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Holding force of 144.18 kg is a theoretical maximum value performed under the following configuration:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • under axial force direction (90-degree angle)
  • at standard ambient temperature

Lifting capacity in real conditions – factors

Real force impacted by specific conditions, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Product not for children

These products are not toys. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Dust is flammable

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Shattering risk

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Health Danger

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Safe distance

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Compass and GPS

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.

Handling guide

Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.

Pinching danger

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Warning! Details about risks in the article: Safety of working with magnets.