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MP 20x8/4x5 / N38 - ring magnet

ring magnet

Catalog no 030333

GTIN/EAN: 5906301812272

5.00
Load capacity 6.65 kg / 65.21 N Magnetic Induction 277.16 mT / 2772 Gs
Diameter
20 mm [±0,1 mm]
internal diameter Ø
8/4 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.31 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

product parameters »

6.30 zł net / pcs

7.75 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 details - MP 20x8/4x5 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x5 / N38 - ring magnet

properties
properties values
Cat. no. 030333
GTIN/EAN 5906301812272
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 20 mm [±0,1 mm]
internal diameter Ø 8/4 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.31 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.65 kg / 65.21 N
Magnetic Induction ~ ? 277.16 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x5 / 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 simulation of the magnet - data

The following data are the outcome of a physical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world performance might slightly differ. Use these calculations as a supplementary guide for designers.

Table 1: Static force (force vs gap) - power drop
MP 20x8/4x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2424 Gs
242.4 mT
 6.65 kg / 14.66 lbs
6650.0 g / 65.2 N
 warning
1 mm 2265 Gs
226.5 mT
 5.81 kg / 12.80 lbs
5807.9 g / 57.0 N
 warning
2 mm 2070 Gs
207.0 mT
 4.85 kg / 10.69 lbs
4851.0 g / 47.6 N
 warning
3 mm 1858 Gs
185.8 mT
 3.91 kg / 8.61 lbs
3906.5 g / 38.3 N
 warning
5 mm 1437 Gs
143.7 mT
 2.34 kg / 5.16 lbs
2338.7 g / 22.9 N
 warning
10 mm 691 Gs
69.1 mT
 0.54 kg / 1.19 lbs
540.5 g / 5.3 N
 weak grip
15 mm 343 Gs
34.3 mT
 0.13 kg / 0.29 lbs
133.3 g / 1.3 N
 weak grip
20 mm 186 Gs
18.6 mT
 0.04 kg / 0.09 lbs
39.3 g / 0.4 N
 weak grip
30 mm 70 Gs
7.0 mT
 0.01 kg / 0.01 lbs
5.5 g / 0.1 N
 weak grip
50 mm 18 Gs
1.8 mT
 0.00 kg / 0.00 lbs
0.4 g / 0.0 N
 weak grip
Magnetic force weakens sharply with every mm of gap. Remember that even a very thin break (e.g., contamination, paint, veneer) noticeably diminishes the holding power. Magnets work strongest at the point of direct contact; air break nullifies the power. Analyze how flashily the parameters fall, when the magnet does not adhere directly to the metal substrate. When planning the arrangement, discard additional spacers.

Table 2: Vertical capacity (wall)
MP 20x8/4x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.33 kg / 2.93 lbs
1330.0 g / 13.0 N
1 mm Stal (~0.2) 1.16 kg / 2.56 lbs
1162.0 g / 11.4 N
2 mm Stal (~0.2) 0.97 kg / 2.14 lbs
970.0 g / 9.5 N
3 mm Stal (~0.2) 0.78 kg / 1.72 lbs
782.0 g / 7.7 N
5 mm Stal (~0.2) 0.47 kg / 1.03 lbs
468.0 g / 4.6 N
10 mm Stal (~0.2) 0.11 kg / 0.24 lbs
108.0 g / 1.1 N
15 mm Stal (~0.2) 0.03 kg / 0.06 lbs
26.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below defines the theoretical holding capacity required to cause the slippage of the magnet vertically on a vertical steel wall (assuming typical friction). The holding force varies with the air gap between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 20x8/4x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.00 kg / 4.40 lbs
1995.0 g / 19.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.33 kg / 2.93 lbs
1330.0 g / 13.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.67 kg / 1.47 lbs
665.0 g / 6.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.33 kg / 7.33 lbs
3325.0 g / 32.6 N
When mounting a magnet on a vertical wall (e.g., a fridge), it will only hold barely approx. 1/5 of its maximum pull force. Gravity as well as a weak degree of grip mean that holders move down easier than they pop off the substrate. Want to create a vertical fastening? Consider that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the element will slip down under a much lighter load. Utilizing a rubberized coating can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MP 20x8/4x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.67 kg / 1.47 lbs
665.0 g / 6.5 N
1 mm
25%
 1.66 kg / 3.67 lbs
1662.5 g / 16.3 N
2 mm
50%
 3.33 kg / 7.33 lbs
3325.0 g / 32.6 N
3 mm
75%
 4.99 kg / 11.00 lbs
4987.5 g / 48.9 N
5 mm
100%
 6.65 kg / 14.66 lbs
6650.0 g / 65.2 N
10 mm
100%
 6.65 kg / 14.66 lbs
6650.0 g / 65.2 N
11 mm
100%
 6.65 kg / 14.66 lbs
6650.0 g / 65.2 N
12 mm
100%
 6.65 kg / 14.66 lbs
6650.0 g / 65.2 N
A thin sheet is not enough to conduct the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a too thin substrate, the field will penetrate right through and the pull force will drop sharply. To utilize the maximum of this neodymium's potential, you need a suitably thick backing of steel. The saturation effect causes that on sheet metal structures (e.g., car bodies), the holder works worse. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
MP 20x8/4x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.65 kg / 14.66 lbs
6650.0 g / 65.2 N
 OK
40 °C -2.2% 6.50 kg / 14.34 lbs
6503.7 g / 63.8 N
 OK
60 °C -4.4% 6.36 kg / 14.02 lbs
6357.4 g / 62.4 N
80 °C -6.6% 6.21 kg / 13.69 lbs
6211.1 g / 60.9 N
100 °C -28.8% 4.73 kg / 10.44 lbs
4734.8 g / 46.4 N
Ordinary NdFeB products lose strength above the temperature limit. Avoid high temperatures – high temperature can permanently destroy this magnet. With increasing heat, the neodymium's power temporarily drops. Do not use this magnet close to ovens exceeding its operating temperature limit. Ignoring the limit will cause destruction of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Flat magnets (pancake types) are more susceptible to demagnetization sooner than long magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 20x8/4x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.28 kg / 20.47 lbs
4 012 Gs
1.39 kg / 3.07 lbs
1393 g / 13.7 N
 N/A
1 mm 8.73 kg / 19.25 lbs
4 701 Gs
1.31 kg / 2.89 lbs
1310 g / 12.8 N
 7.86 kg / 17.33 lbs
~0 Gs
2 mm 8.11 kg / 17.88 lbs
4 530 Gs
1.22 kg / 2.68 lbs
1216 g / 11.9 N
 7.30 kg / 16.09 lbs
~0 Gs
3 mm 7.45 kg / 16.42 lbs
4 342 Gs
1.12 kg / 2.46 lbs
1117 g / 11.0 N
 6.70 kg / 14.78 lbs
~0 Gs
5 mm 6.10 kg / 13.45 lbs
3 930 Gs
0.92 kg / 2.02 lbs
915 g / 9.0 N
 5.49 kg / 12.11 lbs
~0 Gs
10 mm 3.27 kg / 7.20 lbs
2 875 Gs
0.49 kg / 1.08 lbs
490 g / 4.8 N
 2.94 kg / 6.48 lbs
~0 Gs
20 mm 0.75 kg / 1.66 lbs
1 382 Gs
0.11 kg / 0.25 lbs
113 g / 1.1 N
 0.68 kg / 1.50 lbs
~0 Gs
50 mm 0.02 kg / 0.04 lbs
220 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
60 mm 0.01 kg / 0.02 lbs
139 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.01 lbs
93 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
65 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
47 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
35 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 significantly greater distance than a magnet and sheet setup. Such a system of magnet-to-magnet generates a stronger field and a larger range of action. Planning to create a solid fastener? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is huge. The levitation is a bit weaker than the attraction, but still significant.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
* Results refer to friction force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - precautionary measures
MP 20x8/4x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.0 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field poses a serious hazard to IT equipment and pacemakers. These magnets produce a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field acts through matter and plastic. Increased vigilance must be taken by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
MP 20x8/4x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.22 km/h
(7.01 m/s)
 0.28 J
30 mm 26.09 km/h
(7.25 m/s)
 0.30 J
50 mm 26.10 km/h
(7.25 m/s)
 0.30 J
100 mm 26.11 km/h
(7.25 m/s)
 0.30 J
NdFeB products are very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Impact energy can cause material chips or painful pinches to skin. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (durability)
MP 20x8/4x5 / 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 (Pc)
MP 20x8/4x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 218 Mx 72.2 µWb
Pc Coefficient 0.31 Low (Flat)
Total magnetic flux emitted by the pole surface. Key data when building generators as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 20x8/4x5 / N38

Environment Effective steel pull Effect
Air (land) 6.65 kg Standard
Water (riverbed) 7.61 kg
(+0.96 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.
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.

3. Temperature resistance

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.31

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.

Technical and environmental data

Material specification

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: 030333-2026
Measurement Calculator

Force (pull)

Field Strength

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The ring magnet with a hole MP 20x8/4x5 / 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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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 8/4 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
It is a magnetic ring with a diameter of 20 mm and thickness 5 mm. The pulling force of this model is an impressive 6.65 kg, which translates to 65.21 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. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of Nd2Fe14B magnets.

Strengths

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • Their power is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
  • They retain their magnetic properties even under strong external field,
  • In other words, due to the aesthetic layer of nickel, the element is aesthetically pleasing,
  • Magnets exhibit impressive magnetic induction on the active area,
  • 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 detailed forming and optimizing to defined conditions,
  • Huge importance in modern industrial fields – they are used in data components, electromotive mechanisms, medical equipment, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Limitations

Cons of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using a housing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

The load parameter shown refers to the limit force, recorded under ideal test conditions, namely:
  • with the application of a yoke made of special test steel, ensuring maximum field concentration
  • with a cross-section no less than 10 mm
  • characterized by lack of roughness
  • under conditions of gap-free contact (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

It is worth knowing that the application force will differ influenced by the following factors, in order of importance:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Plate material – mild steel attracts best. Alloy steels reduce magnetic properties and holding force.
  • Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Safe handling of neodymium magnets
Flammability

Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Powerful field

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

Magnets are brittle

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Serious injuries

Mind your fingers. Two large magnets will join immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Allergic reactions

A percentage of the population suffer from a sensitization to Ni, which is the common plating for neodymium magnets. Frequent touching may cause a rash. We suggest use safety gloves.

Adults only

Only for adults. Tiny parts can be swallowed, leading to severe trauma. Keep away from kids and pets.

Heat sensitivity

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.

Data carriers

Data protection: Strong magnets can damage payment cards and sensitive devices (heart implants, hearing aids, timepieces).

Medical implants

Warning for patients: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Compass and GPS

Be aware: neodymium magnets produce a field that confuses precision electronics. Maintain a separation from your phone, tablet, and navigation systems.

Danger! Want to know more? Read our article: Are neodymium magnets dangerous?