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MP 25x13x4 / N38 - ring magnet

ring magnet

Catalog no 030190

GTIN/EAN: 5906301812074

5.00
Load capacity 4.14 kg / 40.57 N Magnetic Induction 188.92 mT / 1889 Gs
Diameter
25 mm [±0,1 mm]
internal diameter Ø
13 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
10.74 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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Frequently asked questions

What is the hole in a ring magnet for?
For mounting on a screw or a shaft. The bore may be cylindrical or countersunk for a screw head. The hole removes magnet volume, so a ring holds less than a disc of the same outside diameter.
What is the polarisation?
Axial as standard — poles on the flat faces of the ring. Diametrical polarisation is made to order.
What sizes are available?
Outside diameter from 5 to 62 mm from stock. To order up to 200 mm outside diameter, 180 mm bore and 40 mm height, with a lead time of 25–35 days.

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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Technical data of the product - MP 25x13x4 / N38 - ring magnet

Specification / characteristics - MP 25x13x4 / N38 - ring magnet

properties
properties values
Cat. no. 030190
GTIN/EAN 5906301812074
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 25 mm [±0,1 mm]
internal diameter Ø 13 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 10.74 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.14 kg / 40.57 N
Magnetic Induction ~ ? 188.92 mT / 1889 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x13x4 / 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

Technical simulation of the magnet - data

The following data are the direct effect of a engineering calculation. Results rely on models for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs distance) - characteristics
MP 25x13x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
 warning
1 mm 5310 Gs
531.0 mT
 3.50 kg / 7.71 lbs
3497.4 g / 34.3 N
 warning
2 mm 4846 Gs
484.6 mT
 2.91 kg / 6.42 lbs
2912.4 g / 28.6 N
 warning
3 mm 4397 Gs
439.7 mT
 2.40 kg / 5.29 lbs
2398.5 g / 23.5 N
 warning
5 mm 3576 Gs
357.6 mT
 1.59 kg / 3.50 lbs
1586.2 g / 15.6 N
 weak grip
10 mm 2073 Gs
207.3 mT
 0.53 kg / 1.17 lbs
532.9 g / 5.2 N
 weak grip
15 mm 1231 Gs
123.1 mT
 0.19 kg / 0.41 lbs
188.0 g / 1.8 N
 weak grip
20 mm 773 Gs
77.3 mT
 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
 weak grip
30 mm 356 Gs
35.6 mT
 0.02 kg / 0.03 lbs
15.7 g / 0.2 N
 weak grip
50 mm 115 Gs
11.5 mT
 0.00 kg / 0.00 lbs
1.6 g / 0.0 N
 weak grip
Grip strength drops sharply per each millimeter of spacing. Note that every additional insulation layer (e.g., contamination, varnish, rust) noticeably diminishes the holding power. Magnets hold most effectively at the point of direct contact; air break kills the power. Notice how quickly the parameters fall, when the magnet does not touch flatly to the steel surface. When calculating the assembly, avoid additional spacers.

Table 2: Vertical force (wall)
MP 25x13x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.83 kg / 1.83 lbs
828.0 g / 8.1 N
1 mm Stal (~0.2) 0.70 kg / 1.54 lbs
700.0 g / 6.9 N
2 mm Stal (~0.2) 0.58 kg / 1.28 lbs
582.0 g / 5.7 N
3 mm Stal (~0.2) 0.48 kg / 1.06 lbs
480.0 g / 4.7 N
5 mm Stal (~0.2) 0.32 kg / 0.70 lbs
318.0 g / 3.1 N
10 mm Stal (~0.2) 0.11 kg / 0.23 lbs
106.0 g / 1.0 N
15 mm Stal (~0.2) 0.04 kg / 0.08 lbs
38.0 g / 0.4 N
20 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
This section shows the approximate shear load necessary to cause the downward movement of the magnet down on a vertical metal surface (considering typical friction). The holding force is a function of the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MP 25x13x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.24 kg / 2.74 lbs
1242.0 g / 12.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.83 kg / 1.83 lbs
828.0 g / 8.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.41 kg / 0.91 lbs
414.0 g / 4.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.07 kg / 4.56 lbs
2070.0 g / 20.3 N
When placing a element on a vertical wall (e.g., a fridge), it will only hold barely about 1/5 of its maximum pull force. Gravitational force and a low friction coefficient mean that products move down faster than they pop off the substrate. Planning a wall mount? Remember that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the holder will slip down under a much lighter load. Utilizing a rubberized coating can drastically improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MP 25x13x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.41 kg / 0.91 lbs
414.0 g / 4.1 N
1 mm
25%
 1.04 kg / 2.28 lbs
1035.0 g / 10.2 N
2 mm
50%
 2.07 kg / 4.56 lbs
2070.0 g / 20.3 N
3 mm
75%
 3.10 kg / 6.85 lbs
3105.0 g / 30.5 N
5 mm
100%
 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
10 mm
100%
 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
11 mm
100%
 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
12 mm
100%
 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
A thin metal plate is not enough to take in the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a weak sheet, the magnetism will pass right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid piece of steel. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (stability) - resistance threshold
MP 25x13x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
 OK
40 °C -2.2% 4.05 kg / 8.93 lbs
4048.9 g / 39.7 N
 OK
60 °C -4.4% 3.96 kg / 8.73 lbs
3957.8 g / 38.8 N
 OK
80 °C -6.6% 3.87 kg / 8.52 lbs
3866.8 g / 37.9 N
100 °C -28.8% 2.95 kg / 6.50 lbs
2947.7 g / 28.9 N
Classic neodymiums lose power past the thermal threshold. Avoid high temperatures – excessive heat can permanently demagnetize this magnet. With every degree above norm, the magnet's force temporarily lowers. Avoid using this magnet close to ovens higher than its safe range. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently sooner than taller cylinders. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MP 25x13x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 83.66 kg / 184.44 lbs
6 082 Gs
12.55 kg / 27.67 lbs
12549 g / 123.1 N
 N/A
1 mm 77.09 kg / 169.95 lbs
11 091 Gs
11.56 kg / 25.49 lbs
11563 g / 113.4 N
 69.38 kg / 152.95 lbs
~0 Gs
2 mm 70.68 kg / 155.81 lbs
10 620 Gs
10.60 kg / 23.37 lbs
10601 g / 104.0 N
 63.61 kg / 140.23 lbs
~0 Gs
3 mm 64.59 kg / 142.40 lbs
10 153 Gs
9.69 kg / 21.36 lbs
9689 g / 95.0 N
 58.13 kg / 128.16 lbs
~0 Gs
5 mm 53.48 kg / 117.90 lbs
9 238 Gs
8.02 kg / 17.68 lbs
8022 g / 78.7 N
 48.13 kg / 106.11 lbs
~0 Gs
10 mm 32.05 kg / 70.66 lbs
7 152 Gs
4.81 kg / 10.60 lbs
4808 g / 47.2 N
 28.85 kg / 63.60 lbs
~0 Gs
20 mm 10.77 kg / 23.74 lbs
4 145 Gs
1.62 kg / 3.56 lbs
1615 g / 15.8 N
 9.69 kg / 21.37 lbs
~0 Gs
50 mm 0.66 kg / 1.45 lbs
1 024 Gs
0.10 kg / 0.22 lbs
99 g / 1.0 N
 0.59 kg / 1.30 lbs
~0 Gs
60 mm 0.32 kg / 0.70 lbs
712 Gs
0.05 kg / 0.10 lbs
48 g / 0.5 N
 0.29 kg / 0.63 lbs
~0 Gs
70 mm 0.17 kg / 0.36 lbs
514 Gs
0.02 kg / 0.05 lbs
25 g / 0.2 N
 0.15 kg / 0.33 lbs
~0 Gs
80 mm 0.09 kg / 0.20 lbs
383 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
 0.08 kg / 0.18 lbs
~0 Gs
90 mm 0.05 kg / 0.12 lbs
293 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.11 lbs
~0 Gs
100 mm 0.03 kg / 0.07 lbs
230 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.07 lbs
~0 Gs
Two magnets interact from a wider radius than a magnet and sheet combination. The connection of magnet-to-magnet produces a massive flux and a wider radius of operation. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the collision energy is huge. The repulsion force is slightly lower than the connection force, but still large.
*Field value for N-N configuration drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Important: Calculations demonstrate sliding force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - warnings
MP 25x13x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 17.0 cm
Hearing aid 10 Gs (1.0 mT) 13.5 cm
Timepiece 20 Gs (2.0 mT) 10.5 cm
Mobile device 40 Gs (4.0 mT) 8.0 cm
Car key 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
A strong magnetic field is a real danger to IT equipment and pacemakers. These NdFeB products produce a field that prevents correct functioning of digital equipment. Be aware: the unseen radiation penetrates the body and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MP 25x13x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.89 km/h
(5.80 m/s)
 0.18 J
30 mm 22.33 km/h
(6.20 m/s)
 0.21 J
50 mm 22.39 km/h
(6.22 m/s)
 0.21 J
100 mm 22.40 km/h
(6.22 m/s)
 0.21 J
Magnetic elements are prone to chipping – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Striking energy can cause material chips or dangerous crushing to skin. Always hold the magnet during installation 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 magnet. Use safety goggles when playing with large magnets.

Table 9: Surface protection spec
MP 25x13x4 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MP 25x13x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 24 861 Mx 248.6 µWb
Pc Coefficient 1.02 High (Stable)
Flux value emitted by the magnet pole. Essential parameter when building generators and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
MP 25x13x4 / N38

Environment Effective steel pull Effect
Air (land) 4.14 kg Standard
Water (riverbed) 4.74 kg
(+0.60 kg buoyancy gain)
+14.5%
Rust risk: 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.02

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.

Engineering data and GPSR

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%

Ecology and recycling (GPSR)

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: 030190-2026
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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 4.14 kg works great as a door latch, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 25x13x4 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. Remember: cracking during assembly results from material properties, not a product defect.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
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 (25 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø25x4 mm and a weight of 10.74 g. The pulling force of this model is an impressive 4.14 kg, which translates to 40.57 N in newtons. The mounting hole diameter is precisely 13 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.

Pros and cons of rare earth magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after around ten years it decreases only by ~1% (according to research),
  • Magnets effectively protect themselves against demagnetization caused by external fields,
  • Thanks to the glossy finish, the surface of nickel, gold-plated, or silver gives an clean appearance,
  • Magnets are distinguished by exceptionally strong magnetic induction on the surface,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
  • Possibility of individual machining and adjusting to complex requirements,
  • Wide application in advanced technology sectors – they are utilized in data components, electric drive systems, diagnostic systems, as well as other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited possibility of producing threads in the magnet and complex shapes - preferred is casing - magnet mounting.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important 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.
  • With mass production the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum magnetic pulling force – what affects it?

Information about lifting capacity was determined for the most favorable conditions, including:
  • on a plate made of mild steel, optimally conducting the magnetic flux
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at conditions approx. 20°C

What influences lifting capacity in practice

During everyday use, the real power depends on many variables, ranked from crucial:
  • Gap (betwixt the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material composition – different alloys attracts identically. Alloy additives weaken the interaction with the magnet.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal environment – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was assessed using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets
Serious injuries

Big blocks can smash fingers in a fraction of a second. Under no circumstances put your hand betwixt two attracting surfaces.

Sensitization to coating

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, prevent touching magnets with bare hands or opt for versions in plastic housing.

Impact on smartphones

A strong magnetic field interferes with the functioning of magnetometers in phones and GPS navigation. Keep magnets near a smartphone to prevent damaging the sensors.

ICD Warning

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Safe operation

Handle magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and respect their force.

Do not overheat magnets

Keep cool. NdFeB magnets are sensitive to heat. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Beware of splinters

Neodymium magnets are ceramic materials, meaning they are very brittle. Impact of two magnets leads to them shattering into small pieces.

Dust explosion hazard

Dust generated during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

This is not a toy

Absolutely keep magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are tragic.

Threat to electronics

Do not bring magnets near a wallet, computer, or screen. The magnetism can permanently damage these devices and wipe information from cards.

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