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MP 30x6x10 / N38 - ring magnet

ring magnet

Catalog no 030197

GTIN/EAN: 5906301812142

5.00
Load capacity 20.71 kg / 203.16 N Magnetic Induction 343.81 mT / 3438 Gs
Diameter
30 mm [±0,1 mm]
internal diameter Ø
6 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
50.89 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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13.01 zł net / pcs

16.00 zł with VAT (23% VAT) / pcs

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Net
Gross
price from 1 pcs
13.01 zł
16.00 zł
price from 50 pcs
12.23 zł
15.04 zł
price from 200 pcs
11.45 zł
14.08 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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Technical of the product - MP 30x6x10 / N38 - ring magnet

Specification / characteristics - MP 30x6x10 / N38 - ring magnet

properties
properties values
Cat. no. 030197
GTIN/EAN 5906301812142
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 30 mm [±0,1 mm]
internal diameter Ø 6 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 50.89 g
Magnetization Direction ↑ axial
Load capacity ~ ? 20.71 kg / 203.16 N
Magnetic Induction ~ ? 343.81 mT / 3438 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 30x6x10 / 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 analysis of the assembly - technical parameters

These data constitute the result of a mathematical analysis. Results are based on algorithms for the class Nd2Fe14B. Operational performance may differ from theoretical values. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static force (pull vs gap) - power drop
MP 30x6x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5619 Gs
561.9 mT
 20.71 kg / 45.66 lbs
20710.0 g / 203.2 N
 crushing
1 mm 5241 Gs
524.1 mT
 18.01 kg / 39.71 lbs
18011.7 g / 176.7 N
 crushing
2 mm 4861 Gs
486.1 mT
 15.50 kg / 34.17 lbs
15498.1 g / 152.0 N
 crushing
3 mm 4490 Gs
449.0 mT
 13.22 kg / 29.15 lbs
13223.5 g / 129.7 N
 crushing
5 mm 3792 Gs
379.2 mT
 9.43 kg / 20.79 lbs
9429.0 g / 92.5 N
 warning
10 mm 2404 Gs
240.4 mT
 3.79 kg / 8.36 lbs
3791.3 g / 37.2 N
 warning
15 mm 1526 Gs
152.6 mT
 1.53 kg / 3.37 lbs
1527.0 g / 15.0 N
 weak grip
20 mm 1000 Gs
100.0 mT
 0.66 kg / 1.45 lbs
655.5 g / 6.4 N
 weak grip
30 mm 482 Gs
48.2 mT
 0.15 kg / 0.34 lbs
152.6 g / 1.5 N
 weak grip
50 mm 161 Gs
16.1 mT
 0.02 kg / 0.04 lbs
17.0 g / 0.2 N
 weak grip
Grip strength drops significantly with every subsequent millimeter of gap. Note that even a microscopic distance (e.g., dirt, varnish, dust) significantly weakens the grip. Magnets operate most effectively at the point of direct contact; gap kills the power. Observe how quickly the pull force drop, when the product does not touch flatly to the metal substrate. When calculating the assembly, eliminate unnecessary gaps.

Table 2: Sliding load (vertical surface)
MP 30x6x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.14 kg / 9.13 lbs
4142.0 g / 40.6 N
1 mm Stal (~0.2) 3.60 kg / 7.94 lbs
3602.0 g / 35.3 N
2 mm Stal (~0.2) 3.10 kg / 6.83 lbs
3100.0 g / 30.4 N
3 mm Stal (~0.2) 2.64 kg / 5.83 lbs
2644.0 g / 25.9 N
5 mm Stal (~0.2) 1.89 kg / 4.16 lbs
1886.0 g / 18.5 N
10 mm Stal (~0.2) 0.76 kg / 1.67 lbs
758.0 g / 7.4 N
15 mm Stal (~0.2) 0.31 kg / 0.67 lbs
306.0 g / 3.0 N
20 mm Stal (~0.2) 0.13 kg / 0.29 lbs
132.0 g / 1.3 N
30 mm Stal (~0.2) 0.03 kg / 0.07 lbs
30.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
The table below calculates the estimated shear load needed to cause the shifting of the magnet downwards against a vertical steel plate (assuming typical friction). This value varies with the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MP 30x6x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
6.21 kg / 13.70 lbs
6213.0 g / 60.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.14 kg / 9.13 lbs
4142.0 g / 40.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.07 kg / 4.57 lbs
2071.0 g / 20.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.36 kg / 22.83 lbs
10355.0 g / 101.6 N
When placing a element on a vertical plane (e.g., a car body), it will only hold barely about 1/5 of its maximum pull force. Gravity and a weak degree of grip mean that holders slip faster than they pull off. Want to create a vertical fastening? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will give way down under a noticeably lighter load. Using a rubber coating can drastically improve the result.

Table 4: Material efficiency (saturation) - power losses
MP 30x6x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.04 kg / 2.28 lbs
1035.5 g / 10.2 N
1 mm
13%
 2.59 kg / 5.71 lbs
2588.8 g / 25.4 N
2 mm
25%
 5.18 kg / 11.41 lbs
5177.5 g / 50.8 N
3 mm
38%
 7.77 kg / 17.12 lbs
7766.3 g / 76.2 N
5 mm
63%
 12.94 kg / 28.54 lbs
12943.8 g / 127.0 N
10 mm
100%
 20.71 kg / 45.66 lbs
20710.0 g / 203.2 N
11 mm
100%
 20.71 kg / 45.66 lbs
20710.0 g / 203.2 N
12 mm
100%
 20.71 kg / 45.66 lbs
20710.0 g / 203.2 N
A thin sheet is not enough to conduct the full magnetic flux, which weakens actual performance of the holder. If you mount a strong magnet to a too thin substrate, the field will pass right through and the pull force will drop sharply. To squeeze the maximum of this magnet's power, you need a suitably thick element of metal. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the product works worse. We advise picking the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
MP 30x6x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 20.71 kg / 45.66 lbs
20710.0 g / 203.2 N
 OK
40 °C -2.2% 20.25 kg / 44.65 lbs
20254.4 g / 198.7 N
 OK
60 °C -4.4% 19.80 kg / 43.65 lbs
19798.8 g / 194.2 N
 OK
80 °C -6.6% 19.34 kg / 42.64 lbs
19343.1 g / 189.8 N
100 °C -28.8% 14.75 kg / 32.51 lbs
14745.5 g / 144.7 N
Standard neodymium magnets irreversibly lose strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently demagnetize this product. With every degree above norm, the magnet's force temporarily decreases. Avoid using this product near heat sources exceeding its safe range. Ignoring the limit will lead to permanent loss of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently under lower heat stress than taller cylinders. Red status in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 30x6x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 103.97 kg / 229.22 lbs
6 035 Gs
15.60 kg / 34.38 lbs
15596 g / 153.0 N
 N/A
1 mm 97.15 kg / 214.17 lbs
10 864 Gs
14.57 kg / 32.13 lbs
14572 g / 143.0 N
 87.43 kg / 192.75 lbs
~0 Gs
2 mm 90.42 kg / 199.35 lbs
10 481 Gs
13.56 kg / 29.90 lbs
13564 g / 133.1 N
 81.38 kg / 179.42 lbs
~0 Gs
3 mm 83.97 kg / 185.13 lbs
10 100 Gs
12.60 kg / 27.77 lbs
12596 g / 123.6 N
 75.57 kg / 166.61 lbs
~0 Gs
5 mm 71.94 kg / 158.60 lbs
9 349 Gs
10.79 kg / 23.79 lbs
10791 g / 105.9 N
 64.75 kg / 142.74 lbs
~0 Gs
10 mm 47.34 kg / 104.36 lbs
7 583 Gs
7.10 kg / 15.65 lbs
7100 g / 69.7 N
 42.60 kg / 93.92 lbs
~0 Gs
20 mm 19.03 kg / 41.96 lbs
4 809 Gs
2.86 kg / 6.29 lbs
2855 g / 28.0 N
 17.13 kg / 37.77 lbs
~0 Gs
50 mm 1.53 kg / 3.37 lbs
1 363 Gs
0.23 kg / 0.51 lbs
229 g / 2.2 N
 1.38 kg / 3.03 lbs
~0 Gs
60 mm 0.77 kg / 1.69 lbs
965 Gs
0.11 kg / 0.25 lbs
115 g / 1.1 N
 0.69 kg / 1.52 lbs
~0 Gs
70 mm 0.41 kg / 0.90 lbs
706 Gs
0.06 kg / 0.14 lbs
61 g / 0.6 N
 0.37 kg / 0.81 lbs
~0 Gs
80 mm 0.23 kg / 0.51 lbs
531 Gs
0.03 kg / 0.08 lbs
35 g / 0.3 N
 0.21 kg / 0.46 lbs
~0 Gs
90 mm 0.14 kg / 0.30 lbs
409 Gs
0.02 kg / 0.05 lbs
21 g / 0.2 N
 0.12 kg / 0.27 lbs
~0 Gs
100 mm 0.09 kg / 0.19 lbs
322 Gs
0.01 kg / 0.03 lbs
13 g / 0.1 N
 0.08 kg / 0.17 lbs
~0 Gs
Two magnetic products interact from a wider radius than a neodymium and metal combination. The connection of magnet-to-magnet produces a massive flux and a wider radius of action. Designing a strong closure? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The levitation is a bit weaker than the connection force, 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).
Attention: Estimates demonstrate shear force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
MP 30x6x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 19.5 cm
Hearing aid 10 Gs (1.0 mT) 15.0 cm
Mechanical watch 20 Gs (2.0 mT) 12.0 cm
Mobile device 40 Gs (4.0 mT) 9.0 cm
Car key 50 Gs (5.0 mT) 8.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Powerful magnet radiation is a large risk to electronic devices as well as medical implants. These NdFeB products produce a flux that disrupts operation of digital equipment. Notice: the unseen radiation acts through matter and housings. Increased vigilance must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MP 30x6x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.80 km/h
(6.33 m/s)
 1.02 J
30 mm 24.98 km/h
(6.94 m/s)
 1.23 J
50 mm 25.10 km/h
(6.97 m/s)
 1.24 J
100 mm 25.12 km/h
(6.98 m/s)
 1.24 J
Magnetic elements are prone to chipping – a collision with steel causes immediate chipping. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or injury to fingers. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when handling with powerful specimens.

Table 9: Corrosion resistance
MP 30x6x10 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MP 30x6x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 31 585 Mx 315.8 µWb
Pc Coefficient 0.96 High (Stable)
Flux value passing through the pole surface. Key data in coil applications as well as sensors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 30x6x10 / N38

Environment Effective steel pull Effect
Air (land) 20.71 kg Standard
Water (riverbed) 23.71 kg
(+3.00 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

1. Shear force

*Caution: On a vertical wall, the magnet retains just a fraction of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically weakens 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) = 0.96

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

Chemical composition

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: 030197-2026
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The ring magnet with a hole MP 30x6x10 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. 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 30x6x10 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer 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. If you must use it outside, paint it with anti-corrosion paint after mounting.
A screw or bolt with a thread diameter smaller than 6 mm fits this model. 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 (30 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø30x10 mm and a weight of 50.89 g. The pulling force of this model is an impressive 20.71 kg, which translates to 203.16 N in newtons. The mounting hole diameter is precisely 6 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose strength, even over nearly 10 years – the reduction in power is only ~1% (based on measurements),
  • Neodymium magnets remain extremely resistant to magnetic field loss caused by external field sources,
  • A magnet with a smooth silver surface looks better,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Thanks to versatility in shaping and the ability to adapt to specific needs,
  • Significant place in electronics industry – they find application in computer drives, electromotive mechanisms, medical equipment, and other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also increases their 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
  • 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
  • Limited ability of producing threads in the magnet and complicated shapes - preferred is cover - mounting mechanism.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

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

The load parameter shown concerns the maximum value, measured under laboratory conditions, specifically:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • with a thickness of at least 10 mm
  • with an polished touching surface
  • with zero gap (without paint)
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Bear in mind that the working load will differ subject to elements below, in order of importance:
  • Distance (betwixt the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate lowers the holding force.

H&S for magnets
Cards and drives

Avoid bringing magnets close to a purse, computer, or TV. The magnetism can destroy these devices and erase data from cards.

Physical harm

Pinching hazard: The attraction force is so immense that it can cause hematomas, pinching, and even bone fractures. Use thick gloves.

Adults only

Strictly store magnets away from children. Choking hazard is high, and the consequences of magnets clamping inside the body are fatal.

Phone sensors

GPS units and smartphones are highly susceptible to magnetic fields. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Fire warning

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Safe operation

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

Magnet fragility

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

Heat warning

Watch the temperature. Heating the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Medical implants

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Metal Allergy

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness happens, cease handling magnets and use protective gear.

Caution! More info about risks in the article: Magnet Safety Guide.