Product on order Ships in 3-5 days

MW 40x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010068

GTIN/EAN: 5906301810674

5.00

Diameter Ø

40 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

282.74 g

Magnetization Direction

→ diametrical

Load capacity

54.73 kg / 536.88 N

Magnetic Induction

515.71 mT / 5157 Gs

Coating

[NiCuNi] Nickel

product details »

104.80 ZŁ with VAT / pcs + price for transport

85.20 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?
price from 1 pcs
85.20 ZŁ
104.80 ZŁ
price from 10 pcs
80.09 ZŁ
98.51 ZŁ
price from 30 pcs
74.98 ZŁ
92.22 ZŁ
Carbon Footprint – environmental impact GPSR Regulation – product safety
Need advice?

Call us now +48 888 99 98 98 if you prefer get in touch through contact form our website.
Specifications as well as structure of magnets can be verified using our our magnetic calculator.

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

Technical of the product - MW 40x30 / N38 - cylindrical magnet

Specification / characteristics - MW 40x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010068
GTIN/EAN 5906301810674
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 40 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 282.74 g
Magnetization Direction → diametrical
Load capacity ~ ? 54.73 kg / 536.88 N
Magnetic Induction ~ ? 515.71 mT / 5157 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x30 / 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 analysis of the assembly - report

These information represent the direct effect of a mathematical analysis. Results were calculated on algorithms for the material Nd2Fe14B. Operational performance may differ. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MW 40x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5156 Gs
515.6 mT
 54.73 kg / 120.66 pounds
54730.0 g / 536.9 N
 crushing
1 mm 4900 Gs
490.0 mT
 49.43 kg / 108.98 pounds
49432.0 g / 484.9 N
 crushing
2 mm 4641 Gs
464.1 mT
 44.33 kg / 97.74 pounds
44334.0 g / 434.9 N
 crushing
3 mm 4383 Gs
438.3 mT
 39.54 kg / 87.17 pounds
39538.7 g / 387.9 N
 crushing
5 mm 3879 Gs
387.9 mT
 30.98 kg / 68.30 pounds
30981.5 g / 303.9 N
 crushing
10 mm 2773 Gs
277.3 mT
 15.83 kg / 34.89 pounds
15826.7 g / 155.3 N
 crushing
15 mm 1946 Gs
194.6 mT
 7.79 kg / 17.18 pounds
7792.9 g / 76.4 N
 warning
20 mm 1372 Gs
137.2 mT
 3.88 kg / 8.55 pounds
3877.9 g / 38.0 N
 warning
30 mm 723 Gs
72.3 mT
 1.08 kg / 2.37 pounds
1076.5 g / 10.6 N
 safe
50 mm 258 Gs
25.8 mT
 0.14 kg / 0.30 pounds
137.4 g / 1.3 N
 safe
Pulling power weakens sharply with every mm of gap. Remember that even the smallest gap (e.g., dirt, varnish, veneer) strongly weakens the grip. Neodymiums operate optimally during direct contact; gap weakens the power. Notice how rapidly the load capacity fall, when the magnet does not touch flatly to the metal substrate. When planning the mounting, eliminate unnecessary gaps.

Table 2: Shear hold (vertical surface)
MW 40x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 10.95 kg / 24.13 pounds
10946.0 g / 107.4 N
1 mm Stal (~0.2) 9.89 kg / 21.79 pounds
9886.0 g / 97.0 N
2 mm Stal (~0.2) 8.87 kg / 19.55 pounds
8866.0 g / 87.0 N
3 mm Stal (~0.2) 7.91 kg / 17.43 pounds
7908.0 g / 77.6 N
5 mm Stal (~0.2) 6.20 kg / 13.66 pounds
6196.0 g / 60.8 N
10 mm Stal (~0.2) 3.17 kg / 6.98 pounds
3166.0 g / 31.1 N
15 mm Stal (~0.2) 1.56 kg / 3.43 pounds
1558.0 g / 15.3 N
20 mm Stal (~0.2) 0.78 kg / 1.71 pounds
776.0 g / 7.6 N
30 mm Stal (~0.2) 0.22 kg / 0.48 pounds
216.0 g / 2.1 N
50 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
The table below indicates the approximate weight limit needed to initiate the sliding of the magnet downwards against a vertical steel wall (considering standard friction). The holding force is relative to the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MW 40x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
16.42 kg / 36.20 pounds
16419.0 g / 161.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
10.95 kg / 24.13 pounds
10946.0 g / 107.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
5.47 kg / 12.07 pounds
5473.0 g / 53.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
27.37 kg / 60.33 pounds
27365.0 g / 268.5 N
When placing a magnet on a upright surface (e.g., a fridge), it will only hold just about 20%-30% of its maximum pull force. Gravity as well as a weak degree of grip mean that holders slip faster than they pop off the substrate. Designing a wall mount? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the element will slide down under a significantly smaller load. Utilizing a rubberized layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - power losses
MW 40x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 1.82 kg / 4.02 pounds
1824.3 g / 17.9 N
1 mm
8%
 4.56 kg / 10.05 pounds
4560.8 g / 44.7 N
2 mm
17%
 9.12 kg / 20.11 pounds
9121.7 g / 89.5 N
3 mm
25%
 13.68 kg / 30.16 pounds
13682.5 g / 134.2 N
5 mm
42%
 22.80 kg / 50.27 pounds
22804.2 g / 223.7 N
10 mm
83%
 45.61 kg / 100.55 pounds
45608.3 g / 447.4 N
11 mm
92%
 50.17 kg / 110.60 pounds
50169.2 g / 492.2 N
12 mm
100%
 54.73 kg / 120.66 pounds
54730.0 g / 536.9 N
A too thin steel is not enough to focus the full magnetic flux, which weakens actual performance of the magnet. If you attach a powerful product to a weak sheet, the magnetism will penetrate right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's power, you require a sufficiently solid backing of steel. The saturation phenomenon means that on delicate walls (e.g., appliance housings), the magnet holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Working in heat (stability) - thermal limit
MW 40x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 54.73 kg / 120.66 pounds
54730.0 g / 536.9 N
 OK
40 °C -2.2% 53.53 kg / 118.00 pounds
53525.9 g / 525.1 N
 OK
60 °C -4.4% 52.32 kg / 115.35 pounds
52321.9 g / 513.3 N
 OK
80 °C -6.6% 51.12 kg / 112.70 pounds
51117.8 g / 501.5 N
100 °C -28.8% 38.97 kg / 85.91 pounds
38967.8 g / 382.3 N
Ordinary NdFeB products change their properties parameters 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 product in hot environments exceeding its working range. Too high temperature will lead to permanent loss of magnetism.
*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 40x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 205.97 kg / 454.08 pounds
5 879 Gs
30.89 kg / 68.11 pounds
30895 g / 303.1 N
 N/A
1 mm 195.99 kg / 432.09 pounds
10 060 Gs
29.40 kg / 64.81 pounds
29399 g / 288.4 N
 176.39 kg / 388.88 pounds
~0 Gs
2 mm 186.03 kg / 410.12 pounds
9 800 Gs
27.90 kg / 61.52 pounds
27904 g / 273.7 N
 167.42 kg / 369.11 pounds
~0 Gs
3 mm 176.30 kg / 388.68 pounds
9 541 Gs
26.45 kg / 58.30 pounds
26445 g / 259.4 N
 158.67 kg / 349.81 pounds
~0 Gs
5 mm 157.67 kg / 347.60 pounds
9 023 Gs
23.65 kg / 52.14 pounds
23650 g / 232.0 N
 141.90 kg / 312.84 pounds
~0 Gs
10 mm 116.59 kg / 257.04 pounds
7 759 Gs
17.49 kg / 38.56 pounds
17489 g / 171.6 N
 104.93 kg / 231.34 pounds
~0 Gs
20 mm 59.56 kg / 131.31 pounds
5 545 Gs
8.93 kg / 19.70 pounds
8934 g / 87.6 N
 53.60 kg / 118.18 pounds
~0 Gs
50 mm 7.52 kg / 16.58 pounds
1 971 Gs
1.13 kg / 2.49 pounds
1128 g / 11.1 N
 6.77 kg / 14.92 pounds
~0 Gs
60 mm 4.05 kg / 8.93 pounds
1 446 Gs
0.61 kg / 1.34 pounds
608 g / 6.0 N
 3.65 kg / 8.04 pounds
~0 Gs
70 mm 2.28 kg / 5.03 pounds
1 085 Gs
0.34 kg / 0.75 pounds
342 g / 3.4 N
 2.05 kg / 4.53 pounds
~0 Gs
80 mm 1.34 kg / 2.96 pounds
832 Gs
0.20 kg / 0.44 pounds
201 g / 2.0 N
 1.21 kg / 2.66 pounds
~0 Gs
90 mm 0.82 kg / 1.80 pounds
650 Gs
0.12 kg / 0.27 pounds
123 g / 1.2 N
 0.74 kg / 1.62 pounds
~0 Gs
100 mm 0.52 kg / 1.14 pounds
517 Gs
0.08 kg / 0.17 pounds
78 g / 0.8 N
 0.47 kg / 1.03 pounds
~0 Gs
Two magnets attract each other from a much further distance than a neodymium and metal setup. The connection of two magnets creates a more powerful interaction and a further horizon of performance. Designing a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the pinch force is massive. The levitation is marginally weaker than the attraction, but still significant.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
* Results demonstrate sliding force of two identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
MW 40x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 23.5 cm
Hearing aid 10 Gs (1.0 mT) 18.0 cm
Mechanical watch 20 Gs (2.0 mT) 14.0 cm
Mobile device 40 Gs (4.0 mT) 11.0 cm
Car key 50 Gs (5.0 mT) 10.0 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 real danger to electronics and medical implants. These NdFeB products generate a flux that destroys function of sensitive medical devices. Notice: the unseen radiation passes through tissues and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MW 40x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.37 km/h
(4.55 m/s)
 2.92 J
30 mm 24.60 km/h
(6.83 m/s)
 6.60 J
50 mm 31.42 km/h
(8.73 m/s)
 10.77 J
100 mm 44.37 km/h
(12.33 m/s)
 21.48 J
Magnetic elements are prone to chipping – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can cause material chips or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when working with large magnets.

Table 9: Anti-corrosion coating durability
MW 40x30 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MW 40x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 65 488 Mx 654.9 µWb
Pc Coefficient 0.76 High (Stable)
Flux value 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 40x30 / N38

Environment Effective steel pull Effect
Air (land) 54.73 kg Standard
Water (riverbed) 62.67 kg
(+7.94 kg buoyancy gain)
+14.5%
Rust risk: 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Warning: On a vertical wall, the magnet retains only ~20% of its nominal pull.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.76

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical and environmental data
Material specification
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
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: 010068-2026
Magnet Unit Converter
Pulling force
Magnetic Induction
Put your value in just one slot to see the conversion in the other units at once.

See also offers

MW 10x1.5 / N38 - cylindrical magnet
Product on order Ships in 3-5 days

MW 10x1.5 / N38 - cylindrical magnet

0.431 ZŁ brutto / pcs
MW 22x6 / N38 - cylindrical magnet
Product on order Ships in 3-5 days

MW 22x6 / N38 - cylindrical magnet

6.11 ZŁ brutto / pcs
UMS 42x12.5x6.5x9 / N38 - conical magnetic holder
Product on order Ships in 3-5 days

UMS 42x12.5x6.5x9 / N38 - conical magnetic holder

27.06 ZŁ brutto / pcs
MW 4x6 / N38 - cylindrical magnet
Product on order Ships in 3-5 days

MW 4x6 / N38 - cylindrical magnet

0.381 ZŁ brutto / pcs
This product is an extremely powerful rod magnet, composed of modern NdFeB material, which, at dimensions of Ø40x30 mm, guarantees optimal power. This specific item is characterized by high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 54.73 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing 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 536.88 N with a weight of only 282.74 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 40.1 mm) using two-component epoxy glues. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability 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 even stronger magnets in the same volume (Ø40x30), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø40x30 mm, which, at a weight of 282.74 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 54.73 kg (force ~536.88 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, 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 40 mm. 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 through the diameter if your project requires it.

Strengths as well as weaknesses of rare earth magnets.

Benefits

Apart from their superior holding force, neodymium magnets have these key benefits:
  • They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • They feature excellent resistance to weakening of magnetic properties as a result of external fields,
  • Thanks to the metallic finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an professional appearance,
  • Neodymium magnets create maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Considering the potential of flexible forming and adaptation to unique needs, neodymium magnets can be manufactured in a variety of forms and dimensions, which increases their versatility,
  • Huge importance in modern industrial fields – they are used in mass storage devices, electromotive mechanisms, medical devices, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in small systems

Weaknesses

Problematic aspects of neodymium magnets: application proposals
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their force 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
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing nuts in the magnet and complex forms - preferred is cover - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small components of these products are able to be problematic in diagnostics medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The specified lifting capacity refers to the limit force, measured under laboratory conditions, specifically:
  • with the application of a sheet made of special test steel, ensuring full magnetic saturation
  • whose transverse dimension equals approx. 10 mm
  • with a plane perfectly flat
  • without any air gap between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Please note that the working load may be lower depending on elements below, in order of importance:
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Plate material – low-carbon steel attracts best. Higher carbon content lower magnetic properties and holding force.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet and the plate decreases the load capacity.

Warnings
Product not for children

NdFeB magnets are not toys. Eating several magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and requires immediate surgery.

Metal Allergy

Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. If your skin reacts to metals, prevent direct skin contact or opt for encased magnets.

Keep away from computers

Device Safety: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Pacemakers

Individuals with a ICD must keep an absolute distance from magnets. The magnetism can stop the functioning of the implant.

Phone sensors

Note: neodymium magnets generate a field that disrupts sensitive sensors. Keep a separation from your phone, tablet, and GPS.

Physical harm

Pinching hazard: The pulling power is so immense that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Flammability

Dust generated during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Beware of splinters

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Power loss in heat

Control the heat. Exposing the magnet to high heat will ruin its magnetic structure and pulling force.

Caution required

Exercise caution. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can move away.

Important! More info about hazards in the article: Safety of working with magnets.