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MP 20x5x27 / N38 - ring magnet

ring magnet

Catalog no 030185

GTIN/EAN: 5906301812029

5.00
Load capacity 10.36 kg / 101.60 N Magnetic Induction 581.04 mT / 5810 Gs
Diameter
20 mm [±0,1 mm]
internal diameter Ø
5 mm [±0,1 mm]
Height
27 mm [±0,1 mm]
Weight
59.64 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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26.83 zł net / pcs

33.00 zł with VAT (23% VAT) / pcs

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Gross
price from 1 pcs
26.83 zł
33.00 zł
price from 30 pcs
25.22 zł
31.02 zł
price from 100 pcs
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29.04 zł

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 of the product - MP 20x5x27 / N38 - ring magnet

Specification / characteristics - MP 20x5x27 / N38 - ring magnet

properties
properties values
Cat. no. 030185
GTIN/EAN 5906301812029
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 5 mm [±0,1 mm]
Height 27 mm [±0,1 mm]
Weight 59.64 g
Magnetization Direction ↑ axial
Load capacity ~ ? 10.36 kg / 101.60 N
Magnetic Induction ~ ? 581.04 mT / 5810 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x5x27 / 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 modeling of the product - data

Presented information represent the outcome of a mathematical simulation. Values rely on models for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs gap) - characteristics
MP 20x5x27 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5716 Gs
571.6 mT
 10.36 kg / 22.84 pounds
10360.0 g / 101.6 N
 critical level
1 mm 5288 Gs
528.8 mT
 8.87 kg / 19.55 pounds
8865.5 g / 87.0 N
 medium risk
2 mm 4861 Gs
486.1 mT
 7.49 kg / 16.51 pounds
7491.0 g / 73.5 N
 medium risk
3 mm 4446 Gs
444.6 mT
 6.27 kg / 13.82 pounds
6267.5 g / 61.5 N
 medium risk
5 mm 3677 Gs
367.7 mT
 4.29 kg / 9.45 pounds
4285.9 g / 42.0 N
 medium risk
10 mm 2216 Gs
221.6 mT
 1.56 kg / 3.43 pounds
1557.1 g / 15.3 N
 safe
15 mm 1354 Gs
135.4 mT
 0.58 kg / 1.28 pounds
580.9 g / 5.7 N
 safe
20 mm 864 Gs
86.4 mT
 0.24 kg / 0.52 pounds
236.9 g / 2.3 N
 safe
30 mm 405 Gs
40.5 mT
 0.05 kg / 0.11 pounds
52.1 g / 0.5 N
 safe
50 mm 133 Gs
13.3 mT
 0.01 kg / 0.01 pounds
5.6 g / 0.1 N
 safe
Pulling power weakens drastically with every subsequent millimeter of distance. Note that even a very thin break (e.g., contamination, paint, dust) strongly reduces the pull force. Neodymiums operate most effectively during direct contact; distance kills the power. Observe how flashily the parameters drop, when the product does not touch tightly to the steel surface. When calculating the mounting, eliminate additional spacers.

Table 2: Shear force (vertical surface)
MP 20x5x27 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.07 kg / 4.57 pounds
2072.0 g / 20.3 N
1 mm Stal (~0.2) 1.77 kg / 3.91 pounds
1774.0 g / 17.4 N
2 mm Stal (~0.2) 1.50 kg / 3.30 pounds
1498.0 g / 14.7 N
3 mm Stal (~0.2) 1.25 kg / 2.76 pounds
1254.0 g / 12.3 N
5 mm Stal (~0.2) 0.86 kg / 1.89 pounds
858.0 g / 8.4 N
10 mm Stal (~0.2) 0.31 kg / 0.69 pounds
312.0 g / 3.1 N
15 mm Stal (~0.2) 0.12 kg / 0.26 pounds
116.0 g / 1.1 N
20 mm Stal (~0.2) 0.05 kg / 0.11 pounds
48.0 g / 0.5 N
30 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
This section indicates the approximate weight limit needed to cause the slippage of the magnet downwards on a vertical steel plate (assuming typical friction coefficient). This parameter is a function of the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MP 20x5x27 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.11 kg / 6.85 pounds
3108.0 g / 30.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.07 kg / 4.57 pounds
2072.0 g / 20.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.04 kg / 2.28 pounds
1036.0 g / 10.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.18 kg / 11.42 pounds
5180.0 g / 50.8 N
When hanging a magnet on a vertical wall (e.g., a fridge), it will maintain just about 1/5 of its nominal power. Gravity as well as a low friction coefficient mean that products move down faster than they pop off the substrate. Planning a wall mount? Remember that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a significantly smaller cargo. Application of an anti-slip coating can drastically improve the result.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 20x5x27 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.52 kg / 1.14 pounds
518.0 g / 5.1 N
1 mm
13%
 1.30 kg / 2.85 pounds
1295.0 g / 12.7 N
2 mm
25%
 2.59 kg / 5.71 pounds
2590.0 g / 25.4 N
3 mm
38%
 3.89 kg / 8.56 pounds
3885.0 g / 38.1 N
5 mm
63%
 6.48 kg / 14.27 pounds
6475.0 g / 63.5 N
10 mm
100%
 10.36 kg / 22.84 pounds
10360.0 g / 101.6 N
11 mm
100%
 10.36 kg / 22.84 pounds
10360.0 g / 101.6 N
12 mm
100%
 10.36 kg / 22.84 pounds
10360.0 g / 101.6 N
A thin metal plate is incapable of focus the entire magnetic field, which weakens actual performance of the magnet. If you install a neodymium to a too thin substrate, the field will pass right through and the attraction force will be weaker. To achieve full efficiency of this magnet's potential, you require a sufficiently solid piece of metal. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the magnet works worse. We suggest choosing the steel cross-section from these parameters.

Table 5: Working in heat (stability) - resistance threshold
MP 20x5x27 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 10.36 kg / 22.84 pounds
10360.0 g / 101.6 N
 OK
40 °C -2.2% 10.13 kg / 22.34 pounds
10132.1 g / 99.4 N
 OK
60 °C -4.4% 9.90 kg / 21.83 pounds
9904.2 g / 97.2 N
 OK
80 °C -6.6% 9.68 kg / 21.33 pounds
9676.2 g / 94.9 N
100 °C -28.8% 7.38 kg / 16.26 pounds
7376.3 g / 72.4 N
Standard neodymium magnets change their properties parameters past the thermal threshold. Watch out for overheating – excessive heat can irreversibly destroy this product. As the temperature rises, the magnet's force briefly lowers. Do not use this product close to ovens higher than its working range. Exceeding the critical threshold will result in permanent loss of magnetism.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MP 20x5x27 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 44.24 kg / 97.54 pounds
6 064 Gs
6.64 kg / 14.63 pounds
6636 g / 65.1 N
 N/A
1 mm 41.02 kg / 90.43 pounds
11 008 Gs
6.15 kg / 13.56 pounds
6153 g / 60.4 N
 36.92 kg / 81.39 pounds
~0 Gs
2 mm 37.86 kg / 83.47 pounds
10 576 Gs
5.68 kg / 12.52 pounds
5679 g / 55.7 N
 34.07 kg / 75.12 pounds
~0 Gs
3 mm 34.85 kg / 76.83 pounds
10 146 Gs
5.23 kg / 11.52 pounds
5227 g / 51.3 N
 31.36 kg / 69.14 pounds
~0 Gs
5 mm 29.30 kg / 64.58 pounds
9 303 Gs
4.39 kg / 9.69 pounds
4394 g / 43.1 N
 26.37 kg / 58.13 pounds
~0 Gs
10 mm 18.30 kg / 40.35 pounds
7 353 Gs
2.75 kg / 6.05 pounds
2745 g / 26.9 N
 16.47 kg / 36.32 pounds
~0 Gs
20 mm 6.65 kg / 14.66 pounds
4 432 Gs
1.00 kg / 2.20 pounds
997 g / 9.8 N
 5.98 kg / 13.19 pounds
~0 Gs
50 mm 0.45 kg / 1.00 pounds
1 159 Gs
0.07 kg / 0.15 pounds
68 g / 0.7 N
 0.41 kg / 0.90 pounds
~0 Gs
60 mm 0.22 kg / 0.49 pounds
811 Gs
0.03 kg / 0.07 pounds
33 g / 0.3 N
 0.20 kg / 0.44 pounds
~0 Gs
70 mm 0.12 kg / 0.26 pounds
589 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.23 pounds
~0 Gs
80 mm 0.07 kg / 0.14 pounds
440 Gs
0.01 kg / 0.02 pounds
10 g / 0.1 N
 0.06 kg / 0.13 pounds
~0 Gs
90 mm 0.04 kg / 0.09 pounds
338 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.03 kg / 0.08 pounds
~0 Gs
100 mm 0.02 kg / 0.05 pounds
265 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
Two magnetic products interact from a much further distance than a magnet and steel combination. The setup of two magnets produces a massive flux and a wider radius of operation. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the collision energy is extreme. The levitation is marginally weaker than the connection force, but still large.
*Field value in repulsion mode drops to ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Figures show friction force of a pair of matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - warnings
MP 20x5x27 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 18.0 cm
Hearing aid 10 Gs (1.0 mT) 14.0 cm
Timepiece 20 Gs (2.0 mT) 11.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 8.5 cm
Remote 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
A strong magnetic field is a real danger to IT equipment as well as medical implants. These magnets produce a field that destroys function of digital equipment. Be aware: the unseen radiation penetrates the body and glass. Special caution must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MP 20x5x27 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 14.40 km/h
(4.00 m/s)
 0.48 J
30 mm 15.54 km/h
(4.32 m/s)
 0.56 J
50 mm 15.59 km/h
(4.33 m/s)
 0.56 J
100 mm 15.60 km/h
(4.33 m/s)
 0.56 J
Magnetic elements are very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Coating parameters (durability)
MP 20x5x27 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MP 20x5x27 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 314 Mx 143.1 µWb
Pc Coefficient 1.16 High (Stable)
Flux value passing through the magnet pole. Essential parameter in coil applications as well as sensors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 20x5x27 / N38

Environment Effective steel pull Effect
Air (land) 10.36 kg Standard
Water (riverbed) 11.86 kg
(+1.50 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Wall mount (shear)

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

2. Steel saturation

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

3. Power loss vs temp

*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) = 1.16

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.

Technical specification and ecology

Elemental analysis

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%

Sustainability

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: 030185-2026
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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. 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. Damage to the protective layer during assembly is the most common cause of rusting. If you must use it outside, paint it with anti-corrosion paint after mounting.
The inner hole diameter determines the maximum size of the mounting element. 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 27 mm. The pulling force of this model is an impressive 10.36 kg, which translates to 101.60 N in newtons. The mounting hole diameter is precisely 5 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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 rare earth magnets.

Benefits

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the working layer of the magnet turns out to be very high,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to flexibility in designing and the capacity to modify to complex applications,
  • Versatile presence in high-tech industry – they are used in HDD drives, brushless drives, medical devices, also complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Cons of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. 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 recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited ability of making threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small elements of these devices can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum magnetic pulling force – what affects it?

The specified lifting capacity refers to the maximum value, measured under laboratory conditions, meaning:
  • on a plate made of structural steel, effectively closing the magnetic field
  • with a cross-section minimum 10 mm
  • with a plane perfectly flat
  • with total lack of distance (no coatings)
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Practical aspects of lifting capacity – factors

In real-world applications, the real power is determined by many variables, ranked from most significant:
  • Air gap (between the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Plate thickness – too thin plate does not accept the full field, causing part of the power to be wasted into the air.
  • Metal type – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface finish – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Maximum temperature

Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and pulling force.

Warning for heart patients

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

Data carriers

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

Serious injuries

Big blocks can smash fingers instantly. Do not place your hand betwixt two attracting surfaces.

Fire risk

Machining of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Adults only

Always store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are life-threatening.

Safe operation

Exercise caution. Rare earth magnets act from a long distance and snap with massive power, often quicker than you can react.

Protective goggles

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

Phone sensors

A strong magnetic field disrupts the functioning of magnetometers in phones and GPS navigation. Keep magnets close to a smartphone to avoid damaging the sensors.

Metal Allergy

Certain individuals suffer from a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Extended handling might lead to an allergic reaction. We strongly advise wear protective gloves.

Caution! Looking for details? Read our article: Why are neodymium magnets dangerous?