Product on order Ships in 3-5 days

MP 25x13x4 / N38 - ring magnet

ring magnet

Catalog no 030190

GTIN/EAN: 5906301812074

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

13 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

10.74 g

Magnetization Direction

↑ axial

Load capacity

4.14 kg / 40.57 N

Magnetic Induction

188.92 mT / 1889 Gs

Coating

[NiCuNi] Nickel

view parameters »

6.77 ZŁ with VAT / pcs + price for transport

5.50 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?
price from 1 pcs
5.50 ZŁ
6.77 ZŁ
price from 150 pcs
5.17 ZŁ
6.36 ZŁ
price from 500 pcs
4.84 ZŁ
5.95 ZŁ
Carbon Footprint – environmental impact GPSR Regulation – product safety
Need advice?

Call us now +48 888 99 98 98 otherwise contact us through form the contact form page.
Strength and form of a magnet can be reviewed using our online calculation tool.

Same-day shipping for orders placed before 14:00.

Technical - MP 25x13x4 / N38 - ring magnet

Specification / characteristics - MP 25x13x4 / N38 - ring magnet

properties
properties values
Cat. no. 030190
GTIN/EAN 5906301812074
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 25 mm [±0,1 mm]
internal diameter Ø 13 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 10.74 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.14 kg / 40.57 N
Magnetic Induction ~ ? 188.92 mT / 1889 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x13x4 / 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 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 assembly - data

These values represent the direct effect of a mathematical simulation. Results rely on models for the class Nd2Fe14B. Real-world parameters might slightly differ. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
MP 25x13x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
 strong
1 mm 5310 Gs
531.0 mT
 3.50 kg / 7.71 pounds
3497.4 g / 34.3 N
 strong
2 mm 4846 Gs
484.6 mT
 2.91 kg / 6.42 pounds
2912.4 g / 28.6 N
 strong
3 mm 4397 Gs
439.7 mT
 2.40 kg / 5.29 pounds
2398.5 g / 23.5 N
 strong
5 mm 3576 Gs
357.6 mT
 1.59 kg / 3.50 pounds
1586.2 g / 15.6 N
 weak grip
10 mm 2073 Gs
207.3 mT
 0.53 kg / 1.17 pounds
532.9 g / 5.2 N
 weak grip
15 mm 1231 Gs
123.1 mT
 0.19 kg / 0.41 pounds
188.0 g / 1.8 N
 weak grip
20 mm 773 Gs
77.3 mT
 0.07 kg / 0.16 pounds
74.0 g / 0.7 N
 weak grip
30 mm 356 Gs
35.6 mT
 0.02 kg / 0.03 pounds
15.7 g / 0.2 N
 weak grip
50 mm 115 Gs
11.5 mT
 0.00 kg / 0.00 pounds
1.6 g / 0.0 N
 weak grip
Pulling power decreases sharply with every subsequent millimeter of distance. Keep in mind that even a microscopic distance (e.g., dirt, paint, dust) strongly reduces the pull force. Magnetic products hold optimally during direct contact; distance weakens the power. Observe how quickly the pull force plummet, when the product does not touch directly to the metal substrate. When designing the arrangement, discard redundant distances.

Table 2: Shear load (wall)
MP 25x13x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.83 kg / 1.83 pounds
828.0 g / 8.1 N
1 mm Stal (~0.2) 0.70 kg / 1.54 pounds
700.0 g / 6.9 N
2 mm Stal (~0.2) 0.58 kg / 1.28 pounds
582.0 g / 5.7 N
3 mm Stal (~0.2) 0.48 kg / 1.06 pounds
480.0 g / 4.7 N
5 mm Stal (~0.2) 0.32 kg / 0.70 pounds
318.0 g / 3.1 N
10 mm Stal (~0.2) 0.11 kg / 0.23 pounds
106.0 g / 1.0 N
15 mm Stal (~0.2) 0.04 kg / 0.08 pounds
38.0 g / 0.4 N
20 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below indicates the estimated force needed to cause the downward movement of the magnet downwards on a vertical steel plate (assuming standard friction coefficient). This parameter varies with the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MP 25x13x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.24 kg / 2.74 pounds
1242.0 g / 12.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.83 kg / 1.83 pounds
828.0 g / 8.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.41 kg / 0.91 pounds
414.0 g / 4.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.07 kg / 4.56 pounds
2070.0 g / 20.3 N
When mounting a magnet on a upright wall (e.g., a car body), it will only hold only about 1/5 of its maximum pull force. Gravity as well as a weak degree of grip influence the fact that products move down faster than they pull off. Planning a vertical fastening? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will give way down under a significantly smaller weight. Utilizing a rubberized layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 25x13x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.41 kg / 0.91 pounds
414.0 g / 4.1 N
1 mm
25%
 1.04 kg / 2.28 pounds
1035.0 g / 10.2 N
2 mm
50%
 2.07 kg / 4.56 pounds
2070.0 g / 20.3 N
3 mm
75%
 3.10 kg / 6.85 pounds
3105.0 g / 30.5 N
5 mm
100%
 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
10 mm
100%
 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
11 mm
100%
 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
12 mm
100%
 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
A too thin steel cannot conduct the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the magnetism will penetrate right through and the attraction force will be weaker. To utilize 100% of this neodymium's power, you require a sufficiently solid element of steel. The material oversaturation means that on delicate walls (e.g., thin profiles), the magnet works worse. We advise picking the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MP 25x13x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
 OK
40 °C -2.2% 4.05 kg / 8.93 pounds
4048.9 g / 39.7 N
 OK
60 °C -4.4% 3.96 kg / 8.73 pounds
3957.8 g / 38.8 N
 OK
80 °C -6.6% 3.87 kg / 8.52 pounds
3866.8 g / 37.9 N
100 °C -28.8% 2.95 kg / 6.50 pounds
2947.7 g / 28.9 N
Classic neodymiums change their properties strength past the thermal threshold. Protect against heat – high temperature can permanently demagnetize this product. As the temperature rises, the neodymium's power momentarily decreases. Do not use this magnet close to heaters exceeding its operating temperature limit. Too high temperature will result in irreversible degradation of magnetism.
*Important note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 25x13x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 83.66 kg / 184.44 pounds
6 082 Gs
12.55 kg / 27.67 pounds
12549 g / 123.1 N
 N/A
1 mm 77.09 kg / 169.95 pounds
11 091 Gs
11.56 kg / 25.49 pounds
11563 g / 113.4 N
 69.38 kg / 152.95 pounds
~0 Gs
2 mm 70.68 kg / 155.81 pounds
10 620 Gs
10.60 kg / 23.37 pounds
10601 g / 104.0 N
 63.61 kg / 140.23 pounds
~0 Gs
3 mm 64.59 kg / 142.40 pounds
10 153 Gs
9.69 kg / 21.36 pounds
9689 g / 95.0 N
 58.13 kg / 128.16 pounds
~0 Gs
5 mm 53.48 kg / 117.90 pounds
9 238 Gs
8.02 kg / 17.68 pounds
8022 g / 78.7 N
 48.13 kg / 106.11 pounds
~0 Gs
10 mm 32.05 kg / 70.66 pounds
7 152 Gs
4.81 kg / 10.60 pounds
4808 g / 47.2 N
 28.85 kg / 63.60 pounds
~0 Gs
20 mm 10.77 kg / 23.74 pounds
4 145 Gs
1.62 kg / 3.56 pounds
1615 g / 15.8 N
 9.69 kg / 21.37 pounds
~0 Gs
50 mm 0.66 kg / 1.45 pounds
1 024 Gs
0.10 kg / 0.22 pounds
99 g / 1.0 N
 0.59 kg / 1.30 pounds
~0 Gs
60 mm 0.32 kg / 0.70 pounds
712 Gs
0.05 kg / 0.10 pounds
48 g / 0.5 N
 0.29 kg / 0.63 pounds
~0 Gs
70 mm 0.17 kg / 0.36 pounds
514 Gs
0.02 kg / 0.05 pounds
25 g / 0.2 N
 0.15 kg / 0.33 pounds
~0 Gs
80 mm 0.09 kg / 0.20 pounds
383 Gs
0.01 kg / 0.03 pounds
14 g / 0.1 N
 0.08 kg / 0.18 pounds
~0 Gs
90 mm 0.05 kg / 0.12 pounds
293 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.11 pounds
~0 Gs
100 mm 0.03 kg / 0.07 pounds
230 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
 0.03 kg / 0.07 pounds
~0 Gs
Two magnetic products interact from a wider radius than a neodymium and metal setup. The connection of two magnets produces a massive flux and a wider radius of action. Want to build a powerful holder? Apply two magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the pinch force is extreme. The repulsion force is slightly lower than the attraction, but still large.
*Flux density for N-N configuration drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Note: Results demonstrate shear force of dual matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
MP 25x13x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 17.0 cm
Hearing aid 10 Gs (1.0 mT) 13.5 cm
Mechanical watch 20 Gs (2.0 mT) 10.5 cm
Mobile device 40 Gs (4.0 mT) 8.0 cm
Remote 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
A strong magnetic field poses a real danger to electronic devices and pacemakers. These neodymiums generate a flux that prevents correct functioning of digital equipment. Notice: the invisible magnetic field acts through matter and housings. Exceptional care must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MP 25x13x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.33 km/h
(5.93 m/s)
 0.19 J
30 mm 34.38 km/h
(9.55 m/s)
 0.49 J
50 mm 44.29 km/h
(12.30 m/s)
 0.81 J
100 mm 62.62 km/h
(17.39 m/s)
 1.62 J
Neodymium magnets are very brittle – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Corrosion resistance
MP 25x13x4 / 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 following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MP 25x13x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 24 861 Mx 248.6 µWb
Pc Coefficient 1.02 High (Stable)
Flux value emitted by the pole surface. Key data for generator designers as well as sensors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MP 25x13x4 / N38

Environment Effective steel pull Effect
Air (land) 4.14 kg Standard
Water (riverbed) 4.74 kg
(+0.60 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet retains merely a fraction of its max power.

2. Steel thickness impact

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

3. Temperature resistance

*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) = 1.02

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
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: 030190-2026
Quick Unit Converter
Magnet pull force
Magnetic Field
Type data in a box, and the rest change automatically.

Check out more deals

MPL 40x20x5 / N38 - lamellar magnet
Product on order Ships in 3-5 days

MPL 40x20x5 / N38 - lamellar magnet

12.24 ZŁ brutto / pcs
MT 50x1.5x50000 - magnetic tape
Product on order Ships in 3-5 days

MT 50x1.5x50000 - magnetic tape

430.50 ZŁ brutto / pcs
LM TLN - 20 R / N38 - magnetic leviton
Product on order Ships in 3-5 days

LM TLN - 20 R / N38 - magnetic leviton

400.00 ZŁ brutto / pcs
NCM 30x13.5x5 / N38 - channel magnetic holder
Product on order Ships in 3-5 days

NCM 30x13.5x5 / N38 - channel magnetic holder

9.40 ZŁ brutto / pcs
It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This is a crucial issue when working with model MP 25x13x4 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. 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. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
The inner hole diameter determines the maximum size of the mounting element. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. Always check that the screw head is not larger than the outer diameter of the magnet (25 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 25 mm and thickness 4 mm. The key parameter here is the holding force amounting to approximately 4.14 kg (force ~40.57 N). The mounting hole diameter is precisely 13 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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.

Advantages as well as disadvantages of rare earth magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose strength, even over approximately 10 years – the reduction in lifting capacity is only ~1% (according to tests),
  • They have excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
  • A magnet with a metallic silver surface is more attractive,
  • Neodymium magnets create maximum magnetic induction on a small surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • In view of the possibility of accurate shaping and customization to individualized requirements, NdFeB magnets can be modeled in a variety of forms and dimensions, which expands the range of possible applications,
  • Huge importance in innovative solutions – they serve a role in HDD drives, electric motors, medical devices, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in compact constructions

Limitations

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. 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
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complicated forms in magnets, we propose using casing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, small components of these products are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The specified lifting capacity represents the limit force, obtained under optimal environment, specifically:
  • on a plate made of structural steel, perfectly concentrating the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • without the slightest clearance between the magnet and steel
  • under axial force direction (90-degree angle)
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

During everyday use, the actual lifting capacity results from a number of factors, presented from the most important:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet holds much less (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 converting into lifting capacity.
  • Chemical composition of the base – mild steel attracts best. Alloy steels lower magnetic properties and holding force.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate lowers the holding force.

Safe handling of NdFeB magnets
Implant safety

Patients with a ICD should maintain an large gap from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Maximum temperature

Monitor thermal conditions. Heating the magnet to high heat will permanently weaken its properties and strength.

Bone fractures

Danger of trauma: The attraction force is so great that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Dust is flammable

Drilling and cutting of NdFeB material carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

No play value

Only for adults. Small elements can be swallowed, leading to severe trauma. Keep out of reach of children and animals.

GPS and phone interference

GPS units and mobile phones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Nickel allergy

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, cease working with magnets and wear gloves.

Handling guide

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

Magnetic media

Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.

Eye protection

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.

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