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MP 20x18x5 / N38 - ring magnet

ring magnet

Catalog no 030597

GTIN/EAN: 5906301816072

Load capacity 1.32 kg / 12.94 N Magnetic Induction 277.16 mT / 2772 Gs
Diameter
20 mm [±0,1 mm]
internal diameter Ø
18 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
2.24 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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1.600 zł net / pcs

1.968 zł with VAT (23% VAT) / pcs

price for transport

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Frequently asked questions

Where can I compare prices of ring magnets for mounting in Poland?
The DHIT price list and individual product cards show the available ring magnets and their current prices. Compare the outside diameter, hole diameter, height, grade and quantity before ordering.
Are ring magnets resistant to damage?
NdFeB is brittle and may crack on impact or when magnets collide. A coating or suitable housing can provide additional protection, but a screw must not place excessive stress on the magnet. Check the mounting instructions for the selected model.
Which ring magnet is suitable for an outdoor structure?
Check the coating, protection against moisture and the temperature reached at the actual installation site. An unprotected magnet should not be assumed suitable for continuous water exposure. Compare the conditions with the selected product card.
Where can I check the available sizes of neodymium ring magnets?
The category and price list show the dimensions of available models. Each product card gives the outside diameter, inside diameter and height. If a suitable size is missing, ask about a custom version.

Guides from the knowledge base

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
Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Detailed specification - MP 20x18x5 / N38 - ring magnet

Specification / characteristics - MP 20x18x5 / N38 - ring magnet

properties
properties values
Cat. no. 030597
GTIN/EAN 5906301816072
Distributor Dhit sp. z o.o.
Country of origin Poland / China / Germany
Customs code 85059029
Diameter 20 mm [±0,1 mm]
internal diameter Ø 18 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 2.24 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.32 kg / 12.94 N
Magnetic Induction ~ ? 277.16 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x18x5 / N38 - ring magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 - technical parameters

The following information are the outcome of a mathematical calculation. Values were calculated on models for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Use these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs gap) - power drop
MP 20x18x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2771 Gs
277.1 mT
 1.32 kg / 2.91 LBS
1320.0 g / 12.9 N
 weak grip
1 mm 2573 Gs
257.3 mT
 1.14 kg / 2.51 LBS
1138.1 g / 11.2 N
 weak grip
2 mm 2340 Gs
234.0 mT
 0.94 kg / 2.07 LBS
941.0 g / 9.2 N
 weak grip
3 mm 2092 Gs
209.2 mT
 0.75 kg / 1.66 LBS
752.1 g / 7.4 N
 weak grip
5 mm 1611 Gs
161.1 mT
 0.45 kg / 0.98 LBS
446.4 g / 4.4 N
 weak grip
10 mm 775 Gs
77.5 mT
 0.10 kg / 0.23 LBS
103.2 g / 1.0 N
 weak grip
15 mm 387 Gs
38.7 mT
 0.03 kg / 0.06 LBS
25.7 g / 0.3 N
 weak grip
20 mm 211 Gs
21.1 mT
 0.01 kg / 0.02 LBS
7.7 g / 0.1 N
 weak grip
30 mm 80 Gs
8.0 mT
 0.00 kg / 0.00 LBS
1.1 g / 0.0 N
 weak grip
50 mm 20 Gs
2.0 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 weak grip
Grip strength weakens drastically with every mm of gap. Keep in mind that even a very thin break (e.g., contamination, paint, dust) noticeably weakens the grip. Neodymiums hold strongest at the point of direct contact; distance nullifies the power. See how rapidly the pull force drop, when the magnet does not touch directly to the steel surface. When calculating the mounting, discard unnecessary gaps.

Table 2: Shear capacity (wall)
MP 20x18x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Raw steel (µ ≈ 0.2) 0.26 kg / 0.58 LBS
264.0 g / 2.6 N
1 mm Raw steel (µ ≈ 0.2) 0.23 kg / 0.50 LBS
228.0 g / 2.2 N
2 mm Raw steel (µ ≈ 0.2) 0.19 kg / 0.41 LBS
188.0 g / 1.8 N
3 mm Raw steel (µ ≈ 0.2) 0.15 kg / 0.33 LBS
150.0 g / 1.5 N
5 mm Raw steel (µ ≈ 0.2) 0.09 kg / 0.20 LBS
90.0 g / 0.9 N
10 mm Raw steel (µ ≈ 0.2) 0.02 kg / 0.04 LBS
20.0 g / 0.2 N
15 mm Raw steel (µ ≈ 0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
20 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
30 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section shows the theoretical force sufficient to initiate the shifting of the magnet vertically along a vertical steel wall (considering typical friction coefficient). The holding force is a function of the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 20x18x5 / N38

Surface type Friction coefficient / % Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% of nominal force
0.40 kg / 0.87 LBS
396.0 g / 3.9 N
Painted steel (standard)
µ = 0.2 20% of nominal force
0.26 kg / 0.58 LBS
264.0 g / 2.6 N
Oily/slippery steel
µ = 0.1 10% of nominal force
0.13 kg / 0.29 LBS
132.0 g / 1.3 N
Magnet with anti-slip rubber
µ = 0.5 50% of nominal force
0.66 kg / 1.46 LBS
660.0 g / 6.5 N
When placing a element on a vertical wall (e.g., a fridge), it will maintain barely about 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient cause that holders move down faster than they pop off the substrate. Want to create a vertical fastening? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a much lighter weight. Using a rubber coating can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 20x18x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.13 kg / 0.29 LBS
132.0 g / 1.3 N
1 mm
25%
 0.33 kg / 0.73 LBS
330.0 g / 3.2 N
2 mm
50%
 0.66 kg / 1.46 LBS
660.0 g / 6.5 N
3 mm
75%
 0.99 kg / 2.18 LBS
990.0 g / 9.7 N
5 mm
100%
 1.32 kg / 2.91 LBS
1320.0 g / 12.9 N
10 mm
100%
 1.32 kg / 2.91 LBS
1320.0 g / 12.9 N
11 mm
100%
 1.32 kg / 2.91 LBS
1320.0 g / 12.9 N
12 mm
100%
 1.32 kg / 2.91 LBS
1320.0 g / 12.9 N
A thin metal plate is incapable of focus the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a weak sheet, the flux will penetrate right through and the holding will be smaller. To utilize 100% of this magnet's potential, you require a sufficiently solid backing of steel. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal stability (stability) - power drop
MP 20x18x5 / N38

Magnet temperature (°C) Force change relative to 20°C Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.32 kg / 2.91 LBS
1320.0 g / 12.9 N
 Estimate
40 °C -4.4% 1.26 kg / 2.78 LBS
1262.6 g / 12.4 N
 Estimate
60 °C -8.6% 1.21 kg / 2.66 LBS
1206.4 g / 11.8 N
 Estimate
80 °C -12.8% 1.15 kg / 2.54 LBS
1151.5 g / 11.3 N
 Material limit
100 °C — — Out of range — no model
The table estimates the reversible force change relative to 20°C, assuming a Br coefficient of -0.11%/°C and force proportional to Br². This is a simplified model with unchanged contact and geometry, not a measurement. Above the material limit, neither force nor irreversible magnetization loss is predicted.
The temperature limit comes from this product’s material data. Permissible conditions also depend on geometry and the magnetic circuit. Without B-H curves for the specific grade and temperature, Pc alone does not determine irreversible demagnetization. Values within the material range do not guarantee the allowable temperature of the complete assembly.

Table 6: Two magnets (attraction) - field collision
MP 20x18x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.83 kg / 6.23 LBS
4 380 Gs
0.42 kg / 0.93 LBS
424 g / 4.2 N
 N/A
1 mm 2.64 kg / 5.82 LBS
5 357 Gs
0.40 kg / 0.87 LBS
396 g / 3.9 N
 2.38 kg / 5.24 LBS
~0 Gs
2 mm 2.44 kg / 5.37 LBS
5 146 Gs
0.37 kg / 0.81 LBS
365 g / 3.6 N
 2.19 kg / 4.83 LBS
~0 Gs
3 mm 2.23 kg / 4.91 LBS
4 918 Gs
0.33 kg / 0.74 LBS
334 g / 3.3 N
 2.00 kg / 4.42 LBS
~0 Gs
5 mm 1.81 kg / 3.98 LBS
4 433 Gs
0.27 kg / 0.60 LBS
271 g / 2.7 N
 1.63 kg / 3.59 LBS
~0 Gs
10 mm 0.96 kg / 2.11 LBS
3 223 Gs
0.14 kg / 0.32 LBS
143 g / 1.4 N
 0.86 kg / 1.90 LBS
~0 Gs
20 mm 0.22 kg / 0.49 LBS
1 549 Gs
0.03 kg / 0.07 LBS
33 g / 0.3 N
 0.20 kg / 0.44 LBS
~0 Gs
50 mm 0.01 kg / 0.01 LBS
251 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.01 LBS
159 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
107 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
75 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
54 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
41 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums attract each other from a wider radius than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a larger range of action. Designing a solid fastener? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is extreme. The repulsion force is marginally weaker than the attraction, but still significant.
*Field value between like poles reaches ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Attention: Estimates apply to sliding force of a pair of matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Axial field levels — not safety zones
MP 20x18x5 / N38

Field level (Gs) mT Model distance (cm)
< 5 Gs < 0.5 mT 8.5 cm
< 10 Gs < 1.0 mT 6.5 cm
< 20 Gs < 2.0 mT 5.5 cm
< 40 Gs < 4.0 mT 4.0 cm
< 50 Gs < 5.0 mT 4.0 cm
< 400 Gs < 40.0 mT 1.5 cm
< 600 Gs < 60.0 mT 1.5 cm
Reference field levels for a model of one magnet, on its axis in air, with a 5 mm distance step. These are not device immunity limits or safe distances for implants. Do not use this table to assess the safety of a pacemaker, defibrillator or other implant; follow the device manufacturer’s and your clinician’s guidance. Steel and other magnets change the field distribution.

Table 8: Collisions (kinetic energy) - warning
MP 20x18x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.93 km/h
(6.92 m/s)
 0.05 J
30 mm 25.78 km/h
(7.16 m/s)
 0.06 J
50 mm 25.80 km/h
(7.17 m/s)
 0.06 J
100 mm 25.80 km/h
(7.17 m/s)
 0.06 J
Magnetic elements are very brittle – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or injury to fingers. Always hold the magnet during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 20x18x5 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MP 20x18x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 811 Mx 28.1 µWb
Pc Coefficient 0.64 High (Stable)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications and motors. Pc value defines the working geometry.

Table 11: Physics of underwater searching
MP 20x18x5 / N38

Environment Effective steel pull Effect
Air (land) 1.32 kg Standard
Water (riverbed) 1.51 kg
(+0.19 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.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

1. Shear force

*Warning: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Temperature resistance

N38: the maximum material working temperature is 80°C. Permitted conditions also depend on the shape and magnetic circuit.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.64

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. At low Pc values (typical for flat magnets, below about 1) 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

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: 030597-2026
Measurement Calculator

Force (pull)

Field Strength

Type a value in a box, and the rest change in real-time.

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The ring-shaped magnet MP 20x18x5 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 1.32 kg works great as a door latch, speaker holder, or spacer element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer under the screw head, which will cushion the stresses. Remember: cracking during assembly results from material properties, not a product defect.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. Damage to the protective layer during assembly is the most common cause of rusting. If you must use it outside, paint it with anti-corrosion paint after mounting.
The inner hole diameter determines the maximum size of the mounting element. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. Always check that the screw head is not larger than the outer diameter of the magnet (20 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø20x5 mm and a weight of 2.24 g. The pulling force of this model is an impressive 1.32 kg, which translates to 12.94 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 18 mm.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
  • Neodymium magnets are characterized by exceptionally resistant to demagnetization caused by external interference,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the working layer of the magnet turns out to be maximum,
  • 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 versatility in constructing and the ability to modify to client solutions,
  • Versatile presence in electronics industry – they are used in computer drives, electromotive mechanisms, advanced medical instruments, also complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

What to avoid - cons of neodymium magnets and proposals for their use:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Do not exceed this material temperature limit: 80°C. Overheating may permanently weaken the magnet.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing threads and complex shapes in magnets, we recommend using casing - magnetic mechanism.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small components of these devices 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

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

The declared magnet strength concerns the peak performance, obtained under laboratory conditions, meaning:
  • on a plate made of mild steel, effectively closing the magnetic field
  • possessing a thickness of minimum 10 mm to avoid saturation
  • characterized by smoothness
  • with direct contact (without paint)
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

In real-world applications, the real power depends on several key aspects, presented from crucial:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Surface quality – the more even the plate, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate lowers the load capacity.

Safety rules for work with neodymium magnets
Keep away from computers

Data protection: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Warning for heart patients

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Immense force

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

Fire risk

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

Choking Hazard

These products are not toys. Eating multiple magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.

Precision electronics

A strong magnetic field negatively affects the functioning of compasses in phones and navigation systems. Keep magnets close to a smartphone to avoid damaging the sensors.

Do not overheat magnets

Do not exceed the maximum operating temperature stated in the specifications of the particular product. The limit depends on the material, geometry and operating arrangement; there is no single threshold for all neodymium magnets. Overheating can permanently weaken a magnet.

Crushing force

Pinching hazard: The pulling power is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Allergy Warning

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid touching magnets with bare hands or select coated magnets.

Protective goggles

Protect your eyes. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Caution! Learn more about hazards in the article: Safety of working with magnets.