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MW 80x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010100

GTIN/EAN: 5906301810995

5.00
Load capacity 170.64 kg / 1673.99 N Magnetic Induction 371.95 mT / 3720 Gs
Diameter Ø
80 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
1130.97 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical parameters »

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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.

PDF report Calculator
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Lifting power as well as structure of neodymium magnets can be checked with our magnetic mass calculator.

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Physical properties - MW 80x30 / N38 - cylindrical magnet

Specification / characteristics - MW 80x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010100
GTIN/EAN 5906301810995
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 80 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 1130.97 g
Magnetization Direction ↑ axial
Load capacity ~ ? 170.64 kg / 1673.99 N
Magnetic Induction ~ ? 371.95 mT / 3720 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 80x30 / 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 modeling of the assembly - technical parameters

These data represent the direct effect of a physical analysis. Results are based on algorithms for the material Nd2Fe14B. Actual conditions may differ from theoretical values. Use these data as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - characteristics
MW 80x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3719 Gs
371.9 mT
 170.64 kg / 376.20 LBS
170640.0 g / 1674.0 N
 critical level
1 mm 3643 Gs
364.3 mT
 163.71 kg / 360.93 LBS
163714.9 g / 1606.0 N
 critical level
2 mm 3563 Gs
356.3 mT
 156.65 kg / 345.35 LBS
156647.8 g / 1536.7 N
 critical level
3 mm 3482 Gs
348.2 mT
 149.55 kg / 329.71 LBS
149554.1 g / 1467.1 N
 critical level
5 mm 3314 Gs
331.4 mT
 135.46 kg / 298.63 LBS
135457.0 g / 1328.8 N
 critical level
10 mm 2880 Gs
288.0 mT
 102.34 kg / 225.63 LBS
102343.3 g / 1004.0 N
 critical level
15 mm 2457 Gs
245.7 mT
 74.47 kg / 164.17 LBS
74468.4 g / 730.5 N
 critical level
20 mm 2069 Gs
206.9 mT
 52.79 kg / 116.38 LBS
52789.9 g / 517.9 N
 critical level
30 mm 1439 Gs
143.9 mT
 25.53 kg / 56.29 LBS
25534.0 g / 250.5 N
 critical level
50 mm 704 Gs
70.4 mT
 6.11 kg / 13.48 LBS
6115.0 g / 60.0 N
 medium risk
Grip strength decreases significantly with every subsequent millimeter of distance. Keep in mind that every additional insulation layer (e.g., contamination, paint, rust) strongly diminishes the holding power. Neodymiums work most effectively in perfect adhesion; air break weakens the force. Observe how rapidly the pull force plummet, when the magnet does not touch tightly to the steel surface. When designing the arrangement, avoid additional spacers.

Table 2: Sliding force (wall)
MW 80x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 34.13 kg / 75.24 LBS
34128.0 g / 334.8 N
1 mm Stal (~0.2) 32.74 kg / 72.18 LBS
32742.0 g / 321.2 N
2 mm Stal (~0.2) 31.33 kg / 69.07 LBS
31330.0 g / 307.3 N
3 mm Stal (~0.2) 29.91 kg / 65.94 LBS
29910.0 g / 293.4 N
5 mm Stal (~0.2) 27.09 kg / 59.73 LBS
27092.0 g / 265.8 N
10 mm Stal (~0.2) 20.47 kg / 45.12 LBS
20468.0 g / 200.8 N
15 mm Stal (~0.2) 14.89 kg / 32.84 LBS
14894.0 g / 146.1 N
20 mm Stal (~0.2) 10.56 kg / 23.28 LBS
10558.0 g / 103.6 N
30 mm Stal (~0.2) 5.11 kg / 11.26 LBS
5106.0 g / 50.1 N
50 mm Stal (~0.2) 1.22 kg / 2.69 LBS
1222.0 g / 12.0 N
The table below indicates the estimated weight limit necessary to start the slippage of the magnet vertically against a upright steel plate (considering typical friction). This value depends on the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MW 80x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
51.19 kg / 112.86 LBS
51192.0 g / 502.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
34.13 kg / 75.24 LBS
34128.0 g / 334.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
17.06 kg / 37.62 LBS
17064.0 g / 167.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
85.32 kg / 188.10 LBS
85320.0 g / 837.0 N
When placing a element on a vertical plane (e.g., a board), it will maintain barely about 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip cause that holders move down faster than they detach. Planning a hanger? Remember that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will slide down under a noticeably lighter load. Utilizing a rubberized coating can drastically raise the stability.

Table 4: Steel thickness (saturation) - power losses
MW 80x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 5.69 kg / 12.54 LBS
5688.0 g / 55.8 N
1 mm
8%
 14.22 kg / 31.35 LBS
14220.0 g / 139.5 N
2 mm
17%
 28.44 kg / 62.70 LBS
28440.0 g / 279.0 N
3 mm
25%
 42.66 kg / 94.05 LBS
42660.0 g / 418.5 N
5 mm
42%
 71.10 kg / 156.75 LBS
71100.0 g / 697.5 N
10 mm
83%
 142.20 kg / 313.50 LBS
142200.0 g / 1395.0 N
11 mm
92%
 156.42 kg / 344.85 LBS
156420.0 g / 1534.5 N
12 mm
100%
 170.64 kg / 376.20 LBS
170640.0 g / 1674.0 N
A thin sheet is not enough to take in the full magnetic flux, which wastes potential of the magnet. Should you attach a powerful product to a thin surface, the flux will pass right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you need a suitably thick backing of metal. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the product shows lower pull force. We advise picking the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - resistance threshold
MW 80x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 170.64 kg / 376.20 LBS
170640.0 g / 1674.0 N
 OK
40 °C -2.2% 166.89 kg / 367.92 LBS
166885.9 g / 1637.2 N
 OK
60 °C -4.4% 163.13 kg / 359.64 LBS
163131.8 g / 1600.3 N
80 °C -6.6% 159.38 kg / 351.37 LBS
159377.8 g / 1563.5 N
100 °C -28.8% 121.50 kg / 267.85 LBS
121495.7 g / 1191.9 N
Ordinary NdFeB products irreversibly lose strength above the temperature limit. Avoid high temperatures – excessive heat can permanently destroy this product. As the temperature rises, the neodymium's power temporarily drops. Do not use this product close to heaters exceeding its safe range. Exceeding the critical threshold will lead to destruction of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 80x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 428.66 kg / 945.03 LBS
5 157 Gs
64.30 kg / 141.76 LBS
64299 g / 630.8 N
 N/A
1 mm 420.08 kg / 926.12 LBS
7 364 Gs
63.01 kg / 138.92 LBS
63012 g / 618.1 N
 378.07 kg / 833.51 LBS
~0 Gs
2 mm 411.26 kg / 906.68 LBS
7 286 Gs
61.69 kg / 136.00 LBS
61690 g / 605.2 N
 370.14 kg / 816.01 LBS
~0 Gs
3 mm 402.40 kg / 887.15 LBS
7 207 Gs
60.36 kg / 133.07 LBS
60360 g / 592.1 N
 362.16 kg / 798.43 LBS
~0 Gs
5 mm 384.60 kg / 847.90 LBS
7 046 Gs
57.69 kg / 127.19 LBS
57690 g / 565.9 N
 346.14 kg / 763.11 LBS
~0 Gs
10 mm 340.28 kg / 750.18 LBS
6 627 Gs
51.04 kg / 112.53 LBS
51042 g / 500.7 N
 306.25 kg / 675.17 LBS
~0 Gs
20 mm 257.09 kg / 566.80 LBS
5 761 Gs
38.56 kg / 85.02 LBS
38564 g / 378.3 N
 231.38 kg / 510.12 LBS
~0 Gs
50 mm 92.55 kg / 204.04 LBS
3 456 Gs
13.88 kg / 30.61 LBS
13883 g / 136.2 N
 83.30 kg / 183.63 LBS
~0 Gs
60 mm 64.14 kg / 141.41 LBS
2 877 Gs
9.62 kg / 21.21 LBS
9622 g / 94.4 N
 57.73 kg / 127.27 LBS
~0 Gs
70 mm 44.44 kg / 97.98 LBS
2 395 Gs
6.67 kg / 14.70 LBS
6666 g / 65.4 N
 40.00 kg / 88.18 LBS
~0 Gs
80 mm 30.93 kg / 68.19 LBS
1 998 Gs
4.64 kg / 10.23 LBS
4639 g / 45.5 N
 27.84 kg / 61.37 LBS
~0 Gs
90 mm 21.69 kg / 47.82 LBS
1 673 Gs
3.25 kg / 7.17 LBS
3254 g / 31.9 N
 19.52 kg / 43.04 LBS
~0 Gs
100 mm 15.36 kg / 33.87 LBS
1 408 Gs
2.30 kg / 5.08 LBS
2304 g / 22.6 N
 13.83 kg / 30.48 LBS
~0 Gs
Two strong neodymiums interact from a wider radius than a magnet and sheet combination. Such a system of magnet-to-magnet generates a stronger field and a larger range of operation. Planning to create a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the impact force is extreme. The repulsion force is slightly lower than the connection force, but still impressive.
*The magnetic induction between like poles drops to ~0 Gs at the geometric center between the magnets (due to field cancellation).
Important: Results refer to sliding force of dual same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 80x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 37.5 cm
Hearing aid 10 Gs (1.0 mT) 29.5 cm
Mechanical watch 20 Gs (2.0 mT) 23.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 18.0 cm
Remote 50 Gs (5.0 mT) 16.5 cm
Payment card 400 Gs (40.0 mT) 7.0 cm
HDD hard drive 600 Gs (60.0 mT) 5.5 cm
Extremely neodym field is a serious hazard to electronics as well as pacemakers. These NdFeB products generate a field that destroys function of digital equipment. Remember: the unseen radiation acts through matter and housings. Exceptional care must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, remotes, membranes, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MW 80x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.48 km/h
(4.85 m/s)
 13.32 J
30 mm 23.66 km/h
(6.57 m/s)
 24.42 J
50 mm 24.91 km/h
(6.92 m/s)
 27.06 J
100 mm 25.32 km/h
(7.03 m/s)
 27.98 J
NdFeB products are prone to chipping – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force 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 ends with a crack of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 80x30 / 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 following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MW 80x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 194 600 Mx 1946.0 µWb
Pc Coefficient 0.48 Low (Flat)
Flux value emitted by the pole surface. Essential parameter for generator designers and motors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MW 80x30 / N38

Environment Effective steel pull Effect
Air (land) 170.64 kg Standard
Water (riverbed) 195.38 kg
(+24.74 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!
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Shear force

*Note: On a vertical surface, the magnet retains merely a fraction of its max power.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely reduces the holding force.

3. Thermal stability

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48

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

Technical specification and ecology

Chemical composition

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: 010100-2026
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The offered product is a very strong rod magnet, composed of modern NdFeB material, which, at dimensions of Ø80x30 mm, guarantees optimal power. The MW 80x30 / N38 component is characterized by a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 170.64 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 1673.99 N with a weight of only 1130.97 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 80.1 mm) using two-component epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø80x30), 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 Ø80x30 mm, which, at a weight of 1130.97 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 170.64 kg (force ~1673.99 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 80 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 through the diameter if your project requires it.

Advantages and disadvantages of neodymium magnets.

Benefits

Apart from their strong holding force, neodymium magnets have these key benefits:
  • They retain full power for nearly ten years – the loss is just ~1% (in theory),
  • Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
  • By applying a shiny layer of silver, the element gains an nice look,
  • Neodymium magnets generate maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of precise creating as well as adapting to defined requirements,
  • Fundamental importance in high-tech industry – they are utilized in magnetic memories, drive modules, precision medical tools, as well as multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its 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
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in creating threads and complicated forms in magnets, we propose using a housing - magnetic mechanism.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

Breakaway force was determined for ideal contact conditions, taking into account:
  • using a sheet made of mild steel, functioning as a magnetic yoke
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with a surface perfectly flat
  • under conditions of no distance (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Lifting capacity in practice – influencing factors

Holding efficiency is affected by specific conditions, such as (from most important):
  • Gap (betwixt the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Direction of force – highest force is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet and the plate lowers the load capacity.

Safe handling of neodymium magnets
Magnetic interference

Navigation devices and smartphones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Choking Hazard

Absolutely keep magnets away from children. Risk of swallowing is high, and the effects of magnets clamping inside the body are life-threatening.

Danger to pacemakers

For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Immense force

Handle magnets with awareness. Their immense force can shock even experienced users. Be vigilant and respect their power.

Heat sensitivity

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

Allergic reactions

Certain individuals experience a hypersensitivity to Ni, which is the standard coating for NdFeB magnets. Extended handling may cause a rash. We suggest use protective gloves.

Threat to electronics

Avoid bringing magnets near a purse, computer, or screen. The magnetic field can destroy these devices and erase data from cards.

Protective goggles

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Machining danger

Powder created during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Pinching danger

Protect your hands. Two large magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

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