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MP 40x22x10 / N38 - ring magnet

ring magnet

Catalog no 030344

GTIN/EAN: 5906301812296

5.00
Load capacity 19.34 kg / 189.71 N Magnetic Induction 277.22 mT / 2772 Gs
Diameter
40 mm [±0,1 mm]
internal diameter Ø
22 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
65.74 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical details »

33.00 zł net / pcs

40.59 zł with VAT (23% VAT) / pcs

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Net
Gross
price from 1 pcs
33.00 zł
40.59 zł
price from 20 pcs
31.02 zł
38.15 zł
price from 80 pcs
29.04 zł
35.72 zł

Frequently asked questions

What is the hole in a ring magnet for?
For mounting on a screw or a shaft. The bore may be cylindrical or countersunk for a screw head. The hole removes magnet volume, so a ring holds less than a disc of the same outside diameter.
What is the polarisation?
Axial as standard — poles on the flat faces of the ring. Diametrical polarisation is made to order.
What sizes are available?
Outside diameter from 5 to 62 mm from stock. To order up to 200 mm outside diameter, 180 mm bore and 40 mm height, with a lead time of 25–35 days.

Guides from the knowledge base

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator
Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Physical properties - MP 40x22x10 / N38 - ring magnet

Specification / characteristics - MP 40x22x10 / N38 - ring magnet

properties
properties values
Cat. no. 030344
GTIN/EAN 5906301812296
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 40 mm [±0,1 mm]
internal diameter Ø 22 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 65.74 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.34 kg / 189.71 N
Magnetic Induction ~ ? 277.22 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 40x22x10 / N38 - ring magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 310 °C
Curie Temperature TF 590 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Engineering simulation of the product - report

The following data constitute the outcome of a mathematical simulation. Values rely on models for the class Nd2Fe14B. Real-world parameters may deviate from the simulation results. Use these data as a reference point when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MP 40x22x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5269 Gs
526.9 mT
 19.34 kg / 42.64 lbs
19340.0 g / 189.7 N
 crushing
1 mm 5005 Gs
500.5 mT
 17.46 kg / 38.48 lbs
17455.9 g / 171.2 N
 crushing
2 mm 4739 Gs
473.9 mT
 15.65 kg / 34.50 lbs
15647.5 g / 153.5 N
 crushing
3 mm 4475 Gs
447.5 mT
 13.95 kg / 30.75 lbs
13950.0 g / 136.8 N
 crushing
5 mm 3960 Gs
396.0 mT
 10.93 kg / 24.09 lbs
10927.7 g / 107.2 N
 crushing
10 mm 2832 Gs
283.2 mT
 5.59 kg / 12.32 lbs
5589.2 g / 54.8 N
 warning
15 mm 1990 Gs
199.0 mT
 2.76 kg / 6.09 lbs
2760.5 g / 27.1 N
 warning
20 mm 1407 Gs
140.7 mT
 1.38 kg / 3.04 lbs
1379.2 g / 13.5 N
 safe
30 mm 745 Gs
74.5 mT
 0.39 kg / 0.85 lbs
386.2 g / 3.8 N
 safe
50 mm 268 Gs
26.8 mT
 0.05 kg / 0.11 lbs
50.1 g / 0.5 N
 safe
Magnetic force weakens sharply with every mm of spacing. Keep in mind that even the smallest gap (e.g., dirt, varnish, veneer) significantly weakens the grip. Magnets operate optimally during direct contact; distance nullifies the force. See how flashily the load capacity plummet, when the magnet does not adhere directly to the metal substrate. When planning the arrangement, eliminate redundant distances.

Table 2: Sliding load (wall)
MP 40x22x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.87 kg / 8.53 lbs
3868.0 g / 37.9 N
1 mm Stal (~0.2) 3.49 kg / 7.70 lbs
3492.0 g / 34.3 N
2 mm Stal (~0.2) 3.13 kg / 6.90 lbs
3130.0 g / 30.7 N
3 mm Stal (~0.2) 2.79 kg / 6.15 lbs
2790.0 g / 27.4 N
5 mm Stal (~0.2) 2.19 kg / 4.82 lbs
2186.0 g / 21.4 N
10 mm Stal (~0.2) 1.12 kg / 2.46 lbs
1118.0 g / 11.0 N
15 mm Stal (~0.2) 0.55 kg / 1.22 lbs
552.0 g / 5.4 N
20 mm Stal (~0.2) 0.28 kg / 0.61 lbs
276.0 g / 2.7 N
30 mm Stal (~0.2) 0.08 kg / 0.17 lbs
78.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
The following data shows the estimated shear load required to cause the sliding of the magnet downwards against a vertical steel wall (considering typical friction coefficient). This value is relative to the air gap between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MP 40x22x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.80 kg / 12.79 lbs
5802.0 g / 56.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.87 kg / 8.53 lbs
3868.0 g / 37.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.93 kg / 4.26 lbs
1934.0 g / 19.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.67 kg / 21.32 lbs
9670.0 g / 94.9 N
When mounting a element on a vertical surface (e.g., a car body), it you can count on just approx. 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip mean that holders slip easier than they pull off. Planning a wall mount? Note that the sliding force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the holder will slide down under a significantly smaller weight. Using a rubber pad can drastically improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 40x22x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.97 kg / 2.13 lbs
967.0 g / 9.5 N
1 mm
13%
 2.42 kg / 5.33 lbs
2417.5 g / 23.7 N
2 mm
25%
 4.84 kg / 10.66 lbs
4835.0 g / 47.4 N
3 mm
38%
 7.25 kg / 15.99 lbs
7252.5 g / 71.1 N
5 mm
63%
 12.09 kg / 26.65 lbs
12087.5 g / 118.6 N
10 mm
100%
 19.34 kg / 42.64 lbs
19340.0 g / 189.7 N
11 mm
100%
 19.34 kg / 42.64 lbs
19340.0 g / 189.7 N
12 mm
100%
 19.34 kg / 42.64 lbs
19340.0 g / 189.7 N
A thin sheet is not enough to focus the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a thin surface, 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 element of steel. The saturation phenomenon causes that on thin elements (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel cross-section according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
MP 40x22x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.34 kg / 42.64 lbs
19340.0 g / 189.7 N
 OK
40 °C -2.2% 18.91 kg / 41.70 lbs
18914.5 g / 185.6 N
 OK
60 °C -4.4% 18.49 kg / 40.76 lbs
18489.0 g / 181.4 N
 OK
80 °C -6.6% 18.06 kg / 39.82 lbs
18063.6 g / 177.2 N
100 °C -28.8% 13.77 kg / 30.36 lbs
13770.1 g / 135.1 N
Classic neodymiums irreversibly lose power past the thermal threshold. Avoid high temperatures – excessive heat can permanently demagnetize this magnet. As the temperature rises, the neodymium's capacity momentarily decreases. Do not use this magnet in hot environments exceeding its working range. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MP 40x22x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 171.37 kg / 377.80 lbs
5 920 Gs
25.71 kg / 56.67 lbs
25705 g / 252.2 N
 N/A
1 mm 163.01 kg / 359.38 lbs
10 277 Gs
24.45 kg / 53.91 lbs
24452 g / 239.9 N
 146.71 kg / 323.44 lbs
~0 Gs
2 mm 154.67 kg / 341.00 lbs
10 011 Gs
23.20 kg / 51.15 lbs
23201 g / 227.6 N
 139.21 kg / 306.90 lbs
~0 Gs
3 mm 146.55 kg / 323.08 lbs
9 744 Gs
21.98 kg / 48.46 lbs
21982 g / 215.6 N
 131.89 kg / 290.77 lbs
~0 Gs
5 mm 131.00 kg / 288.81 lbs
9 213 Gs
19.65 kg / 43.32 lbs
19650 g / 192.8 N
 117.90 kg / 259.92 lbs
~0 Gs
10 mm 96.83 kg / 213.47 lbs
7 921 Gs
14.52 kg / 32.02 lbs
14524 g / 142.5 N
 87.15 kg / 192.12 lbs
~0 Gs
20 mm 49.53 kg / 109.18 lbs
5 665 Gs
7.43 kg / 16.38 lbs
7429 g / 72.9 N
 44.57 kg / 98.27 lbs
~0 Gs
50 mm 6.33 kg / 13.95 lbs
2 025 Gs
0.95 kg / 2.09 lbs
949 g / 9.3 N
 5.69 kg / 12.55 lbs
~0 Gs
60 mm 3.42 kg / 7.55 lbs
1 489 Gs
0.51 kg / 1.13 lbs
513 g / 5.0 N
 3.08 kg / 6.79 lbs
~0 Gs
70 mm 1.94 kg / 4.27 lbs
1 120 Gs
0.29 kg / 0.64 lbs
290 g / 2.8 N
 1.74 kg / 3.84 lbs
~0 Gs
80 mm 1.14 kg / 2.52 lbs
860 Gs
0.17 kg / 0.38 lbs
171 g / 1.7 N
 1.03 kg / 2.27 lbs
~0 Gs
90 mm 0.70 kg / 1.54 lbs
673 Gs
0.10 kg / 0.23 lbs
105 g / 1.0 N
 0.63 kg / 1.39 lbs
~0 Gs
100 mm 0.44 kg / 0.98 lbs
536 Gs
0.07 kg / 0.15 lbs
67 g / 0.7 N
 0.40 kg / 0.88 lbs
~0 Gs
Two magnets attract each other from a significantly greater distance than a magnet and sheet combination. Such a system of two magnets produces a massive flux and a larger range of action. Planning to create a strong closure? Apply two magnets instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the pinch force is huge. The repulsion force is slightly lower than the attraction, but still large.
*Flux density in repulsion mode is approximately ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Calculations refer to shear force of two identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
MP 40x22x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 24.0 cm
Hearing aid 10 Gs (1.0 mT) 18.5 cm
Mechanical watch 20 Gs (2.0 mT) 14.5 cm
Mobile device 40 Gs (4.0 mT) 11.0 cm
Car key 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 poses a serious hazard to electronics and pacemakers. These NdFeB products generate a field that destroys function of digital equipment. Remember: the unseen radiation acts through matter and plastic. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MP 40x22x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.05 km/h
(5.85 m/s)
 1.12 J
30 mm 24.27 km/h
(6.74 m/s)
 1.49 J
50 mm 24.52 km/h
(6.81 m/s)
 1.52 J
100 mm 24.57 km/h
(6.82 m/s)
 1.53 J
Magnetic elements are very brittle – a violent impact against metal risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or dangerous crushing to skin. Always hold the magnet during installation so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
MP 40x22x10 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MP 40x22x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 54 070 Mx 540.7 µWb
Pc Coefficient 0.81 High (Stable)
Total magnetic flux emitted by the pole surface. Essential parameter when building generators and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
MP 40x22x10 / N38

Environment Effective steel pull Effect
Air (land) 19.34 kg Standard
Water (riverbed) 22.14 kg
(+2.80 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

*Note: On a vertical surface, the magnet holds merely a fraction of its max power.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.

3. Heat tolerance

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.81

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.

Engineering data and GPSR

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%

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: 030344-2026
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The ring-shaped magnet MP 40x22x10 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 19.34 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 40x22x10 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. Damage to the protective layer during assembly is the most common cause of rusting. If you must use it outside, paint it with anti-corrosion paint after mounting.
A screw or bolt with a thread diameter smaller than 22 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Always check that the screw head is not larger than the outer diameter of the magnet (40 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø40x10 mm and a weight of 65.74 g. The pulling force of this model is an impressive 19.34 kg, which translates to 189.71 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 22 mm.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros as well as cons of Nd2Fe14B magnets.

Pros

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They do not lose strength, even during around ten years – the decrease in lifting capacity is only ~1% (according to tests),
  • They feature excellent resistance to magnetism drop due to external magnetic sources,
  • In other words, due to the aesthetic surface of silver, the element gains a professional look,
  • They show high magnetic induction at the operating surface, which affects their 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...
  • In view of the possibility of precise forming and customization to unique needs, NdFeB magnets can be manufactured in a wide range of geometric configurations, which makes them more universal,
  • Fundamental importance in modern industrial fields – they find application in computer drives, brushless drives, diagnostic systems, as well as other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We recommend a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditions – what it depends on?

The lifting capacity listed is a theoretical maximum value executed under standard conditions:
  • with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • with a thickness minimum 10 mm
  • characterized by lack of roughness
  • with zero gap (no impurities)
  • during pulling in a direction vertical to the plane
  • at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Holding efficiency impacted by specific conditions, mainly (from most important):
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Safe handling of neodymium magnets
Protective goggles

Despite metallic appearance, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Precision electronics

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

Permanent damage

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.

Physical harm

Large magnets can crush fingers instantly. Do not put your hand between two attracting surfaces.

Do not give to children

Strictly keep magnets away from children. Choking hazard is high, and the effects of magnets clamping inside the body are very dangerous.

Machining danger

Fire hazard: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Immense force

Handle with care. Neodymium magnets act from a distance and connect with huge force, often quicker than you can move away.

Life threat

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Magnetic media

Do not bring magnets near a purse, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Allergic reactions

Some people experience a contact allergy to nickel, which is the standard coating for NdFeB magnets. Prolonged contact might lead to dermatitis. We recommend wear protective gloves.

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