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MW 25x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010049

GTIN/EAN: 5906301810483

5.00

Diameter Ø

25 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

18.41 g

Magnetization Direction

↑ axial

Load capacity

7.98 kg / 78.25 N

Magnetic Induction

230.20 mT / 2302 Gs

Coating

[NiCuNi] Nickel

technical details »

8.39 ZŁ with VAT / pcs + price for transport

6.82 ZŁ net + 23% VAT / pcs

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Specifications and appearance of neodymium magnets can be analyzed with our magnetic calculator.

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Technical of the product - MW 25x5 / N38 - cylindrical magnet

Specification / characteristics - MW 25x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010049
GTIN/EAN 5906301810483
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 25 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 18.41 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.98 kg / 78.25 N
Magnetic Induction ~ ? 230.20 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 25x5 / 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

Engineering simulation of the assembly - data

Presented data constitute the direct effect of a mathematical analysis. Results are based on algorithms for the class Nd2Fe14B. Operational performance may deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - power drop
MW 25x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2302 Gs
230.2 mT
 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
 warning
1 mm 2189 Gs
218.9 mT
 7.21 kg / 15.91 lbs
7214.9 g / 70.8 N
 warning
2 mm 2050 Gs
205.0 mT
 6.33 kg / 13.95 lbs
6329.3 g / 62.1 N
 warning
3 mm 1895 Gs
189.5 mT
 5.41 kg / 11.93 lbs
5410.7 g / 53.1 N
 warning
5 mm 1570 Gs
157.0 mT
 3.72 kg / 8.19 lbs
3715.4 g / 36.4 N
 warning
10 mm 890 Gs
89.0 mT
 1.19 kg / 2.63 lbs
1192.8 g / 11.7 N
 low risk
15 mm 495 Gs
49.5 mT
 0.37 kg / 0.81 lbs
368.5 g / 3.6 N
 low risk
20 mm 288 Gs
28.8 mT
 0.12 kg / 0.28 lbs
124.8 g / 1.2 N
 low risk
30 mm 116 Gs
11.6 mT
 0.02 kg / 0.04 lbs
20.2 g / 0.2 N
 low risk
50 mm 31 Gs
3.1 mT
 0.00 kg / 0.00 lbs
1.4 g / 0.0 N
 low risk
Pulling power drops sharply with every mm of spacing. Note that even a very thin break (e.g., contamination, varnish, veneer) significantly diminishes the holding power. Neodymiums hold strongest during direct contact; gap nullifies the force. Analyze how flashily the parameters fall, when the magnet does not adhere directly to the metal substrate. When designing the assembly, avoid additional spacers.

Table 2: Sliding capacity (wall)
MW 25x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.60 kg / 3.52 lbs
1596.0 g / 15.7 N
1 mm Stal (~0.2) 1.44 kg / 3.18 lbs
1442.0 g / 14.1 N
2 mm Stal (~0.2) 1.27 kg / 2.79 lbs
1266.0 g / 12.4 N
3 mm Stal (~0.2) 1.08 kg / 2.39 lbs
1082.0 g / 10.6 N
5 mm Stal (~0.2) 0.74 kg / 1.64 lbs
744.0 g / 7.3 N
10 mm Stal (~0.2) 0.24 kg / 0.52 lbs
238.0 g / 2.3 N
15 mm Stal (~0.2) 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.02 kg / 0.05 lbs
24.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The following data presents the theoretical shear load needed to initiate the shifting of the magnet down on a upright metal surface (assuming standard friction). The holding force is a function of the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MW 25x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.39 kg / 5.28 lbs
2394.0 g / 23.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.60 kg / 3.52 lbs
1596.0 g / 15.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.80 kg / 1.76 lbs
798.0 g / 7.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.99 kg / 8.80 lbs
3990.0 g / 39.1 N
When mounting a magnet on a vertical wall (e.g., a board), it will maintain just about 20%-30% of its nominal power. Gravity as well as a weak degree of grip cause that magnets slip faster than they pop off the substrate. Designing a wall mount? Note that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will slide down under a much lighter weight. Application of an anti-slip coating can significantly improve the result.

Table 4: Material efficiency (saturation) - power losses
MW 25x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.80 kg / 1.76 lbs
798.0 g / 7.8 N
1 mm
25%
 2.00 kg / 4.40 lbs
1995.0 g / 19.6 N
2 mm
50%
 3.99 kg / 8.80 lbs
3990.0 g / 39.1 N
3 mm
75%
 5.99 kg / 13.19 lbs
5985.0 g / 58.7 N
5 mm
100%
 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
10 mm
100%
 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
11 mm
100%
 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
12 mm
100%
 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
A too thin steel cannot conduct the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To squeeze 100% of this neodymium's power, you require a sufficiently solid piece of steel. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MW 25x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
 OK
40 °C -2.2% 7.80 kg / 17.21 lbs
7804.4 g / 76.6 N
 OK
60 °C -4.4% 7.63 kg / 16.82 lbs
7628.9 g / 74.8 N
80 °C -6.6% 7.45 kg / 16.43 lbs
7453.3 g / 73.1 N
100 °C -28.8% 5.68 kg / 12.53 lbs
5681.8 g / 55.7 N
Classic neodymiums irreversibly lose power above the temperature limit. Protect against heat – excessive heat can irreversibly demagnetize this magnet. As the temperature rises, the magnet's capacity temporarily drops. Refrain from using this product in hot environments exceeding its safe range. Ignoring the limit will result in irreversible degradation of magnetism.
*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 25x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 16.03 kg / 35.34 lbs
3 871 Gs
2.40 kg / 5.30 lbs
2405 g / 23.6 N
 N/A
1 mm 15.31 kg / 33.75 lbs
4 498 Gs
2.30 kg / 5.06 lbs
2296 g / 22.5 N
 13.78 kg / 30.38 lbs
~0 Gs
2 mm 14.49 kg / 31.95 lbs
4 377 Gs
2.17 kg / 4.79 lbs
2174 g / 21.3 N
 13.05 kg / 28.76 lbs
~0 Gs
3 mm 13.62 kg / 30.03 lbs
4 243 Gs
2.04 kg / 4.50 lbs
2043 g / 20.0 N
 12.26 kg / 27.03 lbs
~0 Gs
5 mm 11.79 kg / 26.00 lbs
3 948 Gs
1.77 kg / 3.90 lbs
1769 g / 17.4 N
 10.61 kg / 23.40 lbs
~0 Gs
10 mm 7.46 kg / 16.46 lbs
3 141 Gs
1.12 kg / 2.47 lbs
1120 g / 11.0 N
 6.72 kg / 14.81 lbs
~0 Gs
20 mm 2.40 kg / 5.28 lbs
1 780 Gs
0.36 kg / 0.79 lbs
359 g / 3.5 N
 2.16 kg / 4.75 lbs
~0 Gs
50 mm 0.10 kg / 0.21 lbs
355 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
 0.09 kg / 0.19 lbs
~0 Gs
60 mm 0.04 kg / 0.09 lbs
231 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.04 kg / 0.08 lbs
~0 Gs
70 mm 0.02 kg / 0.04 lbs
158 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
80 mm 0.01 kg / 0.02 lbs
112 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.01 kg / 0.01 lbs
82 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.01 lbs
62 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets interact from a wider radius than a neodymium and metal combination. Such a system of two magnets creates a more powerful interaction and a wider radius of action. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the collision energy is huge. The levitation is a bit weaker than the attraction, but still significant.
*The magnetic induction for N-N configuration drops to ~0 Gs in the exact middle of the gap (due to field cancellation).
* Estimates refer to friction force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 25x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 8.0 cm
Timepiece 20 Gs (2.0 mT) 6.0 cm
Mobile device 40 Gs (4.0 mT) 5.0 cm
Remote 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation poses a serious hazard to electronics as well as pacemakers. These NdFeB products produce a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and plastic. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MW 25x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.87 km/h
(6.35 m/s)
 0.37 J
30 mm 36.43 km/h
(10.12 m/s)
 0.94 J
50 mm 46.96 km/h
(13.04 m/s)
 1.57 J
100 mm 66.40 km/h
(18.44 m/s)
 3.13 J
Neodymium magnets are prone to chipping – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Striking energy can cause material chips or painful pinches to skin. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when working with large magnets.

Table 9: Surface protection spec
MW 25x5 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 25x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 13 107 Mx 131.1 µWb
Pc Coefficient 0.29 Low (Flat)
Flux value passing through the pole surface. Key data in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MW 25x5 / N38

Environment Effective steel pull Effect
Air (land) 7.98 kg Standard
Water (riverbed) 9.14 kg
(+1.16 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Note: On a vertical surface, the magnet holds just a fraction of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

*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) = 0.29

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%
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: 010049-2026
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MW 25x2.5 / N38 - cylindrical magnet

3.95 ZŁ brutto / pcs
The offered product is an incredibly powerful rod magnet, composed of modern NdFeB material, which, at dimensions of Ø25x5 mm, guarantees the highest energy density. The MW 25x5 / N38 model is characterized by a tolerance of ±0.1mm and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 7.98 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 78.25 N with a weight of only 18.41 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 25.1 mm) using two-component 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 high repeatability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø25x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø25x5 mm, which, at a weight of 18.41 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 7.98 kg (force ~78.25 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 25 mm. Such an arrangement is standard 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 Nd2Fe14B magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their power remains stable, and after around ten years it drops only by ~1% (theoretically),
  • Magnets very well protect themselves against demagnetization caused by external fields,
  • In other words, due to the reflective layer of nickel, the element gains a professional look,
  • Neodymium magnets generate maximum magnetic induction on a contact point, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • In view of the ability of precise forming and adaptation to individualized requirements, neodymium magnets can be produced in a wide range of forms and dimensions, which increases their versatility,
  • Significant place in modern technologies – they are commonly used in mass storage devices, drive modules, diagnostic systems, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in miniature devices

Weaknesses

What to avoid - cons of neodymium magnets and proposals for their use:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • We suggest cover - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Lifting parameters

Best holding force of the magnet in ideal parameters – what it depends on?

Holding force of 7.98 kg is a theoretical maximum value performed under specific, ideal conditions:
  • with the application of a sheet made of special test steel, ensuring full magnetic saturation
  • with a cross-section minimum 10 mm
  • with a surface perfectly flat
  • without the slightest clearance between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • in neutral thermal conditions

Lifting capacity in real conditions – factors

Please note that the working load will differ influenced by elements below, starting with the most relevant:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Plate thickness – too thin steel causes magnetic saturation, causing part of the flux to be lost into the air.
  • Steel type – mild steel attracts best. Alloy steels decrease magnetic properties and lifting capacity.
  • Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Threat to electronics

Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Do not overheat magnets

Watch the temperature. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.

Combustion hazard

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

Beware of splinters

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Safe operation

Exercise caution. Neodymium magnets attract from a distance and connect with huge force, often faster than you can move away.

Medical implants

Patients with a pacemaker should maintain an safe separation from magnets. The magnetism can interfere with the operation of the implant.

Adults only

Absolutely store magnets away from children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are fatal.

Hand protection

Mind your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Phone sensors

A strong magnetic field disrupts the functioning of compasses in phones and GPS navigation. Maintain magnets near a smartphone to avoid breaking the sensors.

Nickel coating and allergies

Studies show that nickel (the usual finish) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands or select coated magnets.

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