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MP 14x8/4x3 / N38 - ring magnet

ring magnet

Catalog no 030181

GTIN/EAN: 5906301811985

5.00
Load capacity 2.53 kg / 24.85 N Magnetic Induction 244.11 mT / 2441 Gs
Diameter
14 mm [±0,1 mm]
internal diameter Ø
8/4 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
3.18 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see specifications »

2.01 zł net / pcs

2.47 zł with VAT (23% VAT) / pcs

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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 - MP 14x8/4x3 / N38 - ring magnet

Specification / characteristics - MP 14x8/4x3 / N38 - ring magnet

properties
properties values
Cat. no. 030181
GTIN/EAN 5906301811985
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 14 mm [±0,1 mm]
internal diameter Ø 8/4 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 3.18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.53 kg / 24.85 N
Magnetic Induction ~ ? 244.11 mT / 2441 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 14x8/4x3 / N38 - ring 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 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 product - data

These data represent the outcome of a mathematical calculation. Results are based on models for the material Nd2Fe14B. Operational performance may differ. Use these data as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs gap) - interaction chart
MP 14x8/4x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2121 Gs
212.1 mT
 2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
 warning
1 mm 1927 Gs
192.7 mT
 2.09 kg / 4.61 pounds
2090.1 g / 20.5 N
 warning
2 mm 1676 Gs
167.6 mT
 1.58 kg / 3.48 pounds
1579.6 g / 15.5 N
 low risk
3 mm 1410 Gs
141.0 mT
 1.12 kg / 2.46 pounds
1117.9 g / 11.0 N
 low risk
5 mm 943 Gs
94.3 mT
 0.50 kg / 1.10 pounds
500.1 g / 4.9 N
 low risk
10 mm 335 Gs
33.5 mT
 0.06 kg / 0.14 pounds
63.3 g / 0.6 N
 low risk
15 mm 140 Gs
14.0 mT
 0.01 kg / 0.02 pounds
11.1 g / 0.1 N
 low risk
20 mm 69 Gs
6.9 mT
 0.00 kg / 0.01 pounds
2.7 g / 0.0 N
 low risk
30 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 low risk
50 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Magnetic force decreases sharply per each millimeter of distance. Remember that even the smallest gap (e.g., contamination, paint, veneer) significantly weakens the grip. Magnetic products hold optimally in perfect adhesion; air break nullifies the force. Notice how flashily the parameters fall, when the magnet does not touch directly to the metal substrate. When planning the mounting, eliminate unnecessary gaps.

Table 2: Shear load (wall)
MP 14x8/4x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.51 kg / 1.12 pounds
506.0 g / 5.0 N
1 mm Stal (~0.2) 0.42 kg / 0.92 pounds
418.0 g / 4.1 N
2 mm Stal (~0.2) 0.32 kg / 0.70 pounds
316.0 g / 3.1 N
3 mm Stal (~0.2) 0.22 kg / 0.49 pounds
224.0 g / 2.2 N
5 mm Stal (~0.2) 0.10 kg / 0.22 pounds
100.0 g / 1.0 N
10 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data indicates the theoretical weight limit needed to start the downward movement of the magnet down on a vertical metal surface (assuming typical friction coefficient). The holding force is a function of the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 14x8/4x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.76 kg / 1.67 pounds
759.0 g / 7.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.51 kg / 1.12 pounds
506.0 g / 5.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.25 kg / 0.56 pounds
253.0 g / 2.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.27 kg / 2.79 pounds
1265.0 g / 12.4 N
When placing a element on a vertical wall (e.g., a fridge), it you can count on barely about 20%-30% of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that holders slip faster than they pull off. Designing a wall mount? Consider that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the element will give way down under a noticeably lighter load. Utilizing a rubberized layer can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MP 14x8/4x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.25 kg / 0.56 pounds
253.0 g / 2.5 N
1 mm
25%
 0.63 kg / 1.39 pounds
632.5 g / 6.2 N
2 mm
50%
 1.27 kg / 2.79 pounds
1265.0 g / 12.4 N
3 mm
75%
 1.90 kg / 4.18 pounds
1897.5 g / 18.6 N
5 mm
100%
 2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
10 mm
100%
 2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
11 mm
100%
 2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
12 mm
100%
 2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
A thin sheet is unable to conduct the full magnetic flux, which squanders power of the holder. If you mount a strong magnet to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To squeeze 100% of this neodymium's potential, you require a sufficiently solid piece of steel. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the holder holds weaker. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - resistance threshold
MP 14x8/4x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
 OK
40 °C -2.2% 2.47 kg / 5.45 pounds
2474.3 g / 24.3 N
 OK
60 °C -4.4% 2.42 kg / 5.33 pounds
2418.7 g / 23.7 N
80 °C -6.6% 2.36 kg / 5.21 pounds
2363.0 g / 23.2 N
100 °C -28.8% 1.80 kg / 3.97 pounds
1801.4 g / 17.7 N
Classic neodymiums lose strength above the temperature limit. Protect against heat – excessive heat can irreversibly destroy this magnet. With every degree above norm, the magnet's power briefly drops. Do not use this magnet close to heaters exceeding its safe range. Exceeding the critical threshold will lead to irreversible degradation of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 14x8/4x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.33 kg / 7.34 pounds
3 647 Gs
0.50 kg / 1.10 pounds
500 g / 4.9 N
 N/A
1 mm 3.07 kg / 6.76 pounds
4 070 Gs
0.46 kg / 1.01 pounds
460 g / 4.5 N
 2.76 kg / 6.09 pounds
~0 Gs
2 mm 2.75 kg / 6.07 pounds
3 855 Gs
0.41 kg / 0.91 pounds
413 g / 4.0 N
 2.48 kg / 5.46 pounds
~0 Gs
3 mm 2.42 kg / 5.33 pounds
3 612 Gs
0.36 kg / 0.80 pounds
362 g / 3.6 N
 2.17 kg / 4.79 pounds
~0 Gs
5 mm 1.76 kg / 3.88 pounds
3 084 Gs
0.26 kg / 0.58 pounds
264 g / 2.6 N
 1.59 kg / 3.50 pounds
~0 Gs
10 mm 0.66 kg / 1.45 pounds
1 886 Gs
0.10 kg / 0.22 pounds
99 g / 1.0 N
 0.59 kg / 1.31 pounds
~0 Gs
20 mm 0.08 kg / 0.18 pounds
671 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
 0.08 kg / 0.17 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
77 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
47 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
31 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
21 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
15 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
11 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products attract each other from a significantly greater distance than a magnet and sheet combination. The setup of two magnets creates a more powerful interaction and a wider radius of performance. Want to build a strong closure? Apply two magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the collision energy is massive. The repulsion force is marginally weaker than the attraction, but still significant.
*Flux density between like poles reaches ~0 Gs in the exact middle of the gap (due to field cancellation).
* Figures demonstrate friction force of two identical magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
MP 14x8/4x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.5 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field poses a large risk to IT equipment as well as medical implants. These magnets generate a field that destroys function of digital equipment. Remember: the invisible magnetic field passes through tissues and housings. Special caution must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MP 14x8/4x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.43 km/h
(7.07 m/s)
 0.08 J
30 mm 25.72 km/h
(7.15 m/s)
 0.08 J
50 mm 25.73 km/h
(7.15 m/s)
 0.08 J
100 mm 25.73 km/h
(7.15 m/s)
 0.08 J
Magnetic elements are prone to chipping – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can cause material chips or injury to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when playing with large magnets.

Table 9: Corrosion resistance
MP 14x8/4x3 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MP 14x8/4x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 101 Mx 31.0 µWb
Pc Coefficient 0.28 Low (Flat)
Total magnetic flux emitted by the pole surface. Essential parameter for generator designers and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 14x8/4x3 / N38

Environment Effective steel pull Effect
Air (land) 2.53 kg Standard
Water (riverbed) 2.90 kg
(+0.37 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Vertical hold

*Warning: On a vertical wall, the magnet holds only ~20% of its nominal pull.

2. Plate thickness effect

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

3. Temperature resistance

*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) = 0.28

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

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: 030181-2026
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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. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.
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. The flat screw head should evenly press the magnet. 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. 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 (14 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø14 mm (outer diameter) and height 3 mm. The pulling force of this model is an impressive 2.53 kg, which translates to 24.85 N in newtons. The mounting hole diameter is precisely 8/4 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of neodymium magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their magnetic field is durable, and after around 10 years it decreases only by ~1% (theoretically),
  • Magnets very well protect themselves against demagnetization caused by external fields,
  • In other words, due to the metallic surface of nickel, the element gains visual value,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of exact machining and optimizing to concrete requirements,
  • Versatile presence in high-tech industry – they are used in data components, electromotive mechanisms, advanced medical instruments, and technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of making threads in the magnet and complicated shapes - recommended is casing - magnet mounting.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these products can complicate diagnosis medical after entering the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum holding power of the magnet – what it depends on?

The lifting capacity listed is a result of laboratory testing performed under standard conditions:
  • with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • whose transverse dimension is min. 10 mm
  • with a surface free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

In real-world applications, the actual lifting capacity results from many variables, listed from most significant:
  • Air gap (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – mild steel gives the best results. Alloy admixtures lower magnetic properties and lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
This is not a toy

Neodymium magnets are not toys. Swallowing several magnets can lead to them attracting across intestines, which poses a severe health hazard and requires immediate surgery.

Health Danger

Life threat: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Allergic reactions

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If redness happens, cease working with magnets and wear gloves.

Safe operation

Handle with care. Neodymium magnets act from a distance and snap with massive power, often faster than you can react.

Protective goggles

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Permanent damage

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

Threat to electronics

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

Physical harm

Large magnets can smash fingers in a fraction of a second. Never place your hand betwixt two strong magnets.

Dust explosion hazard

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Compass and GPS

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

Danger! Looking for details? Check our post: Why are neodymium magnets dangerous?