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MP 15x7/3.5x5 / N38 - ring magnet

ring magnet

Catalog no 030390

GTIN/EAN: 5906301812302

5.00
Load capacity 5.09 kg / 49.95 N Magnetic Induction 343.70 mT / 3437 Gs
Diameter
15 mm [±0,1 mm]
internal diameter Ø
7/3.5 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
6.27 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical details »

2.80 zł net / pcs

3.44 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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Detailed specification - MP 15x7/3.5x5 / N38 - ring magnet

Specification / characteristics - MP 15x7/3.5x5 / N38 - ring magnet

properties
properties values
Cat. no. 030390
GTIN/EAN 5906301812302
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 15 mm [±0,1 mm]
internal diameter Ø 7/3.5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 6.27 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.09 kg / 49.95 N
Magnetic Induction ~ ? 343.70 mT / 3437 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 15x7/3.5x5 / 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

Physical analysis of the product - report

The following information represent the direct effect of a physical calculation. Values are based on algorithms for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs distance) - characteristics
MP 15x7/3.5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3054 Gs
305.4 mT
 5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
 medium risk
1 mm 2736 Gs
273.6 mT
 4.09 kg / 9.01 lbs
4085.7 g / 40.1 N
 medium risk
2 mm 2372 Gs
237.2 mT
 3.07 kg / 6.77 lbs
3069.9 g / 30.1 N
 medium risk
3 mm 2007 Gs
200.7 mT
 2.20 kg / 4.84 lbs
2197.4 g / 21.6 N
 medium risk
5 mm 1377 Gs
137.7 mT
 1.03 kg / 2.28 lbs
1034.5 g / 10.1 N
 weak grip
10 mm 526 Gs
52.6 mT
 0.15 kg / 0.33 lbs
151.3 g / 1.5 N
 weak grip
15 mm 232 Gs
23.2 mT
 0.03 kg / 0.06 lbs
29.3 g / 0.3 N
 weak grip
20 mm 118 Gs
11.8 mT
 0.01 kg / 0.02 lbs
7.6 g / 0.1 N
 weak grip
30 mm 42 Gs
4.2 mT
 0.00 kg / 0.00 lbs
0.9 g / 0.0 N
 weak grip
50 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
Pulling power weakens drastically with every subsequent millimeter of distance. Remember that even a microscopic distance (e.g., dirt, varnish, dust) strongly weakens the grip. Neodymiums operate most effectively during direct contact; gap drastically cuts the power. Notice how flashily the parameters drop, when the magnet does not touch directly to the metal substrate. When calculating the assembly, discard redundant distances.

Table 2: Shear capacity (wall)
MP 15x7/3.5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.02 kg / 2.24 lbs
1018.0 g / 10.0 N
1 mm Stal (~0.2) 0.82 kg / 1.80 lbs
818.0 g / 8.0 N
2 mm Stal (~0.2) 0.61 kg / 1.35 lbs
614.0 g / 6.0 N
3 mm Stal (~0.2) 0.44 kg / 0.97 lbs
440.0 g / 4.3 N
5 mm Stal (~0.2) 0.21 kg / 0.45 lbs
206.0 g / 2.0 N
10 mm Stal (~0.2) 0.03 kg / 0.07 lbs
30.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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 estimated weight limit necessary to initiate the slippage of the magnet vertically on a upright steel plate (considering standard friction coefficient). The holding force depends on the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 15x7/3.5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.53 kg / 3.37 lbs
1527.0 g / 15.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.02 kg / 2.24 lbs
1018.0 g / 10.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.51 kg / 1.12 lbs
509.0 g / 5.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.55 kg / 5.61 lbs
2545.0 g / 25.0 N
When placing a element on a upright plane (e.g., a board), it you can count on only about 1/5 of its nominal power. Gravitational force and a weak degree of grip influence the fact that products slip faster than they pop off the substrate. Designing a hanger? Consider that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will give way down under a much lighter weight. Using a rubber layer can effectively raise the stability.

Table 4: Material efficiency (saturation) - power losses
MP 15x7/3.5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.51 kg / 1.12 lbs
509.0 g / 5.0 N
1 mm
25%
 1.27 kg / 2.81 lbs
1272.5 g / 12.5 N
2 mm
50%
 2.55 kg / 5.61 lbs
2545.0 g / 25.0 N
3 mm
75%
 3.82 kg / 8.42 lbs
3817.5 g / 37.4 N
5 mm
100%
 5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
10 mm
100%
 5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
11 mm
100%
 5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
12 mm
100%
 5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
A too thin steel is not enough to absorb the full magnetic flux, which weakens actual performance of the holder. If you install a neodymium to a too thin substrate, the field will penetrate right through and the holding will be smaller. To utilize 100% of this magnet's power, you need a suitably thick element of steel. The saturation phenomenon means that on thin elements (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel dimension based on the following data.

Table 5: Working in heat (stability) - power drop
MP 15x7/3.5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
 OK
40 °C -2.2% 4.98 kg / 10.97 lbs
4978.0 g / 48.8 N
 OK
60 °C -4.4% 4.87 kg / 10.73 lbs
4866.0 g / 47.7 N
80 °C -6.6% 4.75 kg / 10.48 lbs
4754.1 g / 46.6 N
100 °C -28.8% 3.62 kg / 7.99 lbs
3624.1 g / 35.6 N
Standard neodymium magnets change their properties power past the thermal threshold. Avoid high temperatures – heat can irreversibly destroy this magnet. With increasing heat, the magnet's capacity temporarily decreases. Avoid using this magnet close to ovens higher than its operating temperature limit. Too high temperature will cause destruction of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 15x7/3.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.17 kg / 18.00 lbs
4 643 Gs
1.22 kg / 2.70 lbs
1225 g / 12.0 N
 N/A
1 mm 7.39 kg / 16.29 lbs
5 810 Gs
1.11 kg / 2.44 lbs
1108 g / 10.9 N
 6.65 kg / 14.66 lbs
~0 Gs
2 mm 6.55 kg / 14.45 lbs
5 472 Gs
0.98 kg / 2.17 lbs
983 g / 9.6 N
 5.90 kg / 13.01 lbs
~0 Gs
3 mm 5.72 kg / 12.62 lbs
5 113 Gs
0.86 kg / 1.89 lbs
858 g / 8.4 N
 5.15 kg / 11.35 lbs
~0 Gs
5 mm 4.19 kg / 9.23 lbs
4 374 Gs
0.63 kg / 1.38 lbs
628 g / 6.2 N
 3.77 kg / 8.31 lbs
~0 Gs
10 mm 1.66 kg / 3.66 lbs
2 753 Gs
0.25 kg / 0.55 lbs
249 g / 2.4 N
 1.49 kg / 3.29 lbs
~0 Gs
20 mm 0.24 kg / 0.54 lbs
1 053 Gs
0.04 kg / 0.08 lbs
36 g / 0.4 N
 0.22 kg / 0.48 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
134 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 / 0.00 lbs
83 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
55 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
38 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
27 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
20 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products interact from a much further distance than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a wider radius of performance. Designing a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the collision energy is massive. The repulsion force is marginally weaker than the connection force, but still large.
*Flux density between like poles is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
Note: Estimates demonstrate shear force of dual same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - warnings
MP 15x7/3.5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Remote 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field is a large risk to IT equipment as well as medical implants. These neodymiums produce a field that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and glass. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MP 15x7/3.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.60 km/h
(7.11 m/s)
 0.16 J
30 mm 25.98 km/h
(7.22 m/s)
 0.16 J
50 mm 25.98 km/h
(7.22 m/s)
 0.16 J
100 mm 25.98 km/h
(7.22 m/s)
 0.16 J
Neodymium magnets are delicate – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can cause material chips or injury to fingers. Be sure to control the product during mounting so it doesn't hit violently against the metal. A collision at high speed means shattering of the magnet. Wear eye protection when playing with large magnets.

Table 9: Surface protection spec
MP 15x7/3.5x5 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MP 15x7/3.5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 791 Mx 47.9 µWb
Pc Coefficient 0.39 Low (Flat)
Flux value passing through the magnet pole. Essential parameter for generator designers and motors. Pc value determines the magnet's operating point.

Table 11: Submerged application
MP 15x7/3.5x5 / N38

Environment Effective steel pull Effect
Air (land) 5.09 kg Standard
Water (riverbed) 5.83 kg
(+0.74 kg buoyancy gain)
+14.5%
Warning: 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. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds only a fraction of its nominal pull.

2. Steel thickness impact

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

3. Heat tolerance

*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) = 0.39

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: 030390-2026
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The ring-shaped magnet MP 15x7/3.5x5 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This is a crucial issue when working with model MP 15x7/3.5x5 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. 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. 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.
A screw or bolt with a thread diameter smaller than 7/3.5 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Always check that the screw head is not larger than the outer diameter of the magnet (15 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø15 mm (outer diameter) and height 5 mm. The key parameter here is the lifting capacity amounting to approximately 5.09 kg (force ~49.95 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 7/3.5 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.

Advantages

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They do not lose magnetism, even after around ten years – the reduction in power is only ~1% (based on measurements),
  • They are resistant to demagnetization induced by external magnetic fields,
  • A magnet with a smooth gold surface looks better,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of exact forming and modifying to concrete conditions,
  • Huge importance in electronics industry – they are used in computer drives, brushless drives, medical devices, as well as modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • We recommend cover - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

Maximum magnetic pulling force – what it depends on?

Magnet power is the result of a measurement for the most favorable conditions, taking into account:
  • with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • with a thickness minimum 10 mm
  • with an polished touching surface
  • without the slightest insulating layer between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature room level

Lifting capacity in real conditions – factors

In practice, the real power results from a number of factors, ranked from crucial:
  • Clearance – the presence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy admixtures reduce magnetic permeability and lifting capacity.
  • Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate lowers the holding force.

H&S for magnets
Data carriers

Powerful magnetic fields can destroy records on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Warning for heart patients

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Powerful field

Be careful. Neodymium magnets act from a distance and connect with huge force, often quicker than you can react.

Material brittleness

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets leads to them breaking into small pieces.

Crushing risk

Risk of injury: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Allergy Warning

Medical facts indicate that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands or choose coated magnets.

Machining danger

Machining of neodymium magnets poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

This is not a toy

These products are not suitable for play. Swallowing multiple magnets can lead to them pinching intestinal walls, which poses a critical condition and requires immediate surgery.

Thermal limits

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

Phone sensors

Remember: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a safe distance from your mobile, tablet, and navigation systems.

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