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MW 50x20 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010080

GTIN/EAN: 5906301810797

Diameter Ø

50 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

294.52 g

Magnetization Direction

↑ axial

Load capacity

70.10 kg / 687.66 N

Magnetic Induction

387.23 mT / 3872 Gs

Coating

[NiCuNi] Nickel

technical details »

106.96 ZŁ with VAT / pcs + price for transport

86.96 ZŁ net + 23% VAT / pcs

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Call us now +48 22 499 98 98 otherwise send us a note via request form the contact form page.
Specifications along with structure of a neodymium magnet can be tested with our modular calculator.

Orders submitted before 14:00 will be dispatched today!

Technical of the product - MW 50x20 / N38 - cylindrical magnet

Specification / characteristics - MW 50x20 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010080
GTIN/EAN 5906301810797
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 Ø 50 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 294.52 g
Magnetization Direction ↑ axial
Load capacity ~ ? 70.10 kg / 687.66 N
Magnetic Induction ~ ? 387.23 mT / 3872 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 50x20 / N38 - cylindrical 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 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Technical modeling of the magnet - report

These data are the outcome of a engineering calculation. Results are based on algorithms for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Please consider these calculations as a supplementary guide for designers.

Table 1: Static pull force (pull vs distance) - power drop
MW 50x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3872 Gs
387.2 mT
 70.10 kg / 154.54 LBS
70100.0 g / 687.7 N
 dangerous!
1 mm 3740 Gs
374.0 mT
 65.41 kg / 144.20 LBS
65408.0 g / 641.7 N
 dangerous!
2 mm 3601 Gs
360.1 mT
 60.65 kg / 133.72 LBS
60652.7 g / 595.0 N
 dangerous!
3 mm 3459 Gs
345.9 mT
 55.95 kg / 123.35 LBS
55950.5 g / 548.9 N
 dangerous!
5 mm 3168 Gs
316.8 mT
 46.94 kg / 103.47 LBS
46935.3 g / 460.4 N
 dangerous!
10 mm 2460 Gs
246.0 mT
 28.31 kg / 62.40 LBS
28306.3 g / 277.7 N
 dangerous!
15 mm 1855 Gs
185.5 mT
 16.10 kg / 35.48 LBS
16095.6 g / 157.9 N
 dangerous!
20 mm 1384 Gs
138.4 mT
 8.96 kg / 19.76 LBS
8963.2 g / 87.9 N
 medium risk
30 mm 782 Gs
78.2 mT
 2.86 kg / 6.31 LBS
2863.1 g / 28.1 N
 medium risk
50 mm 293 Gs
29.3 mT
 0.40 kg / 0.89 LBS
402.4 g / 3.9 N
 low risk
Magnetic force drops significantly with every mm of spacing. Note that even a very thin break (e.g., contamination, varnish, rust) significantly diminishes the holding power. Magnetic products hold most effectively during direct contact; distance nullifies the power. See how rapidly the load capacity plummet, when the magnet does not touch flatly to the metal substrate. When designing the arrangement, discard additional spacers.

Table 2: Sliding load (vertical surface)
MW 50x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 14.02 kg / 30.91 LBS
14020.0 g / 137.5 N
1 mm Stal (~0.2) 13.08 kg / 28.84 LBS
13082.0 g / 128.3 N
2 mm Stal (~0.2) 12.13 kg / 26.74 LBS
12130.0 g / 119.0 N
3 mm Stal (~0.2) 11.19 kg / 24.67 LBS
11190.0 g / 109.8 N
5 mm Stal (~0.2) 9.39 kg / 20.70 LBS
9388.0 g / 92.1 N
10 mm Stal (~0.2) 5.66 kg / 12.48 LBS
5662.0 g / 55.5 N
15 mm Stal (~0.2) 3.22 kg / 7.10 LBS
3220.0 g / 31.6 N
20 mm Stal (~0.2) 1.79 kg / 3.95 LBS
1792.0 g / 17.6 N
30 mm Stal (~0.2) 0.57 kg / 1.26 LBS
572.0 g / 5.6 N
50 mm Stal (~0.2) 0.08 kg / 0.18 LBS
80.0 g / 0.8 N
The table below indicates the theoretical holding capacity necessary to start the slippage of the magnet vertically along a vertical steel wall (assuming typical friction coefficient). This parameter is relative to the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MW 50x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
21.03 kg / 46.36 LBS
21030.0 g / 206.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
14.02 kg / 30.91 LBS
14020.0 g / 137.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
7.01 kg / 15.45 LBS
7010.0 g / 68.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
35.05 kg / 77.27 LBS
35050.0 g / 343.8 N
When mounting a holder on a upright plane (e.g., a car body), it you can count on barely approx. 20%-30% of its nominal power. Gravity as well as a weak degree of grip mean that products move down faster than they detach. Planning a vertical fastening? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a significantly smaller weight. Utilizing a rubberized coating can drastically increase the grip.

Table 4: Material efficiency (saturation) - power losses
MW 50x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 2.34 kg / 5.15 LBS
2336.7 g / 22.9 N
1 mm
8%
 5.84 kg / 12.88 LBS
5841.7 g / 57.3 N
2 mm
17%
 11.68 kg / 25.76 LBS
11683.3 g / 114.6 N
3 mm
25%
 17.53 kg / 38.64 LBS
17525.0 g / 171.9 N
5 mm
42%
 29.21 kg / 64.39 LBS
29208.3 g / 286.5 N
10 mm
83%
 58.42 kg / 128.79 LBS
58416.7 g / 573.1 N
11 mm
92%
 64.26 kg / 141.67 LBS
64258.3 g / 630.4 N
12 mm
100%
 70.10 kg / 154.54 LBS
70100.0 g / 687.7 N
A thin sheet is unable to absorb the entire magnetic field, which wastes potential of the holder. If you attach a powerful product to a too thin substrate, the flux will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this magnet's potential, you require a sufficiently solid element of metal. The saturation effect means that on thin elements (e.g., thin profiles), the product holds weaker. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal stability (stability) - power drop
MW 50x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 70.10 kg / 154.54 LBS
70100.0 g / 687.7 N
 OK
40 °C -2.2% 68.56 kg / 151.14 LBS
68557.8 g / 672.6 N
 OK
60 °C -4.4% 67.02 kg / 147.74 LBS
67015.6 g / 657.4 N
80 °C -6.6% 65.47 kg / 144.34 LBS
65473.4 g / 642.3 N
100 °C -28.8% 49.91 kg / 110.04 LBS
49911.2 g / 489.6 N
Standard neodymium magnets lose parameters above the temperature limit. Avoid high temperatures – excessive heat can irreversibly damage this magnet. With every degree above norm, the neodymium's power temporarily decreases. Refrain from using this magnet near heat sources higher than its operating temperature limit. Too high temperature will cause permanent loss of magnetism.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MW 50x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 181.46 kg / 400.06 LBS
5 255 Gs
27.22 kg / 60.01 LBS
27220 g / 267.0 N
 N/A
1 mm 175.47 kg / 386.84 LBS
7 615 Gs
26.32 kg / 58.03 LBS
26321 g / 258.2 N
 157.92 kg / 348.16 LBS
~0 Gs
2 mm 169.32 kg / 373.28 LBS
7 480 Gs
25.40 kg / 55.99 LBS
25398 g / 249.2 N
 152.39 kg / 335.96 LBS
~0 Gs
3 mm 163.16 kg / 359.70 LBS
7 343 Gs
24.47 kg / 53.96 LBS
24474 g / 240.1 N
 146.84 kg / 323.73 LBS
~0 Gs
5 mm 150.90 kg / 332.67 LBS
7 061 Gs
22.63 kg / 49.90 LBS
22634 g / 222.0 N
 135.81 kg / 299.40 LBS
~0 Gs
10 mm 121.50 kg / 267.86 LBS
6 336 Gs
18.22 kg / 40.18 LBS
18225 g / 178.8 N
 109.35 kg / 241.07 LBS
~0 Gs
20 mm 73.28 kg / 161.54 LBS
4 921 Gs
10.99 kg / 24.23 LBS
10991 g / 107.8 N
 65.95 kg / 145.39 LBS
~0 Gs
50 mm 12.99 kg / 28.63 LBS
2 071 Gs
1.95 kg / 4.29 LBS
1948 g / 19.1 N
 11.69 kg / 25.76 LBS
~0 Gs
60 mm 7.41 kg / 16.34 LBS
1 565 Gs
1.11 kg / 2.45 LBS
1112 g / 10.9 N
 6.67 kg / 14.71 LBS
~0 Gs
70 mm 4.35 kg / 9.58 LBS
1 198 Gs
0.65 kg / 1.44 LBS
652 g / 6.4 N
 3.91 kg / 8.62 LBS
~0 Gs
80 mm 2.62 kg / 5.78 LBS
931 Gs
0.39 kg / 0.87 LBS
393 g / 3.9 N
 2.36 kg / 5.20 LBS
~0 Gs
90 mm 1.63 kg / 3.59 LBS
734 Gs
0.24 kg / 0.54 LBS
245 g / 2.4 N
 1.47 kg / 3.23 LBS
~0 Gs
100 mm 1.04 kg / 2.30 LBS
587 Gs
0.16 kg / 0.34 LBS
156 g / 1.5 N
 0.94 kg / 2.07 LBS
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. Such a system of two magnets generates a stronger field and a larger range of operation. Designing a solid fastener? Use a pair of magnets instead of one magnet and a steel. Be careful that when attracting two neodymiums, the pinch force is huge. The repulsion force is slightly lower than the attraction, but still impressive.
*Flux density between like poles reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Note: Figures show sliding force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - precautionary measures
MW 50x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 24.0 cm
Hearing aid 10 Gs (1.0 mT) 19.0 cm
Mechanical watch 20 Gs (2.0 mT) 15.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 11.5 cm
Remote 50 Gs (5.0 mT) 10.5 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm
Powerful magnet radiation is a serious hazard to electronics and pacemakers. These neodymiums generate a field that destroys function of digital equipment. Remember: the unseen radiation passes through tissues and housings. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MW 50x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.09 km/h
(5.30 m/s)
 4.14 J
30 mm 27.63 km/h
(7.67 m/s)
 8.67 J
50 mm 34.92 km/h
(9.70 m/s)
 13.85 J
100 mm 49.21 km/h
(13.67 m/s)
 27.51 J
Magnetic elements are delicate – a strong collision with metal can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when playing with large magnets.

Table 9: Anti-corrosion coating durability
MW 50x20 / 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)
MW 50x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 78 540 Mx 785.4 µWb
Pc Coefficient 0.50 Low (Flat)
Total magnetic flux emitted by the magnet pole. Essential parameter for generator designers and motors. The Pc coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 50x20 / N38

Environment Effective steel pull Effect
Air (land) 70.10 kg Standard
Water (riverbed) 80.26 kg
(+10.16 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. 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)

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.

3. Thermal stability

*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) = 0.50

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 and environmental data
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%
Environmental data
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: 010080-2026
Magnet Unit Converter
Pulling force
Magnetic Induction
Insert a value in one of the inputs, to see all other values change on the fly.

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The offered product is an exceptionally strong rod magnet, manufactured from durable NdFeB material, which, with dimensions of Ø50x20 mm, guarantees the highest energy density. This specific item boasts a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 70.10 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 687.66 N with a weight of only 294.52 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 50.1 mm) using epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for the majority of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø50x20), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø50x20 mm, which, at a weight of 294.52 g, makes it an element with impressive magnetic energy density. The value of 687.66 N means that the magnet is capable of holding a weight many times exceeding its own mass of 294.52 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 20 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Advantages and disadvantages of neodymium magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
  • They have excellent resistance to weakening of magnetic properties as a result of external fields,
  • In other words, due to the metallic layer of gold, the element becomes visually attractive,
  • The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in shaping and the ability to modify to client solutions,
  • Significant place in high-tech industry – they are commonly used in magnetic memories, drive modules, diagnostic systems, as well as other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease their strength 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest cover - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these devices can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Magnetic strength at its maximum – what affects it?

The lifting capacity listed is a measurement result executed under the following configuration:
  • with the application of a sheet made of special test steel, guaranteeing maximum field concentration
  • with a cross-section minimum 10 mm
  • characterized by even structure
  • with direct contact (no paint)
  • under axial force vector (90-degree angle)
  • at room temperature

Impact of factors on magnetic holding capacity in practice

During everyday use, the real power depends on several key aspects, listed from crucial:
  • Distance – existence of any layer (rust, tape, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Angle of force application – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick plate does not accept the full field, causing part of the power to be escaped to the other side.
  • Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces 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 holding force.

H&S for magnets
Heat warning

Keep cool. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Hand protection

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

Threat to navigation

Navigation devices and mobile phones are highly sensitive to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Do not drill into magnets

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

This is not a toy

NdFeB magnets are not toys. Swallowing a few magnets may result in them attracting across intestines, which constitutes a critical condition and requires urgent medical intervention.

Medical implants

For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Fragile material

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Cards and drives

Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Immense force

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Allergy Warning

Some people have a contact allergy to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause an allergic reaction. It is best to wear protective gloves.

Safety First! Details about hazards in the article: Safety of working with magnets.