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MP 62x42x25 / N38 - ring magnet

ring magnet

Catalog no 030205

GTIN/EAN: 5906301812227

5.00
Load capacity 58.67 kg / 575.60 N Magnetic Induction 389.14 mT / 3891 Gs
Diameter
62 mm [±0,1 mm]
internal diameter Ø
42 mm [±0,1 mm]
Height
25 mm [±0,1 mm]
Weight
306.31 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
view properties »

165.00 zł with VAT / pcs + price for transport

134.15 zł net + 23% VAT / pcs

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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
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Pick up the phone and ask +48 888 99 98 98 alternatively get in touch using request form the contact form page.
Lifting power along with shape of a neodymium magnet can be checked with our online calculation tool.

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Detailed specification - MP 62x42x25 / N38 - ring magnet

Specification / characteristics - MP 62x42x25 / N38 - ring magnet

properties
properties values
Cat. no. 030205
GTIN/EAN 5906301812227
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 62 mm [±0,1 mm]
internal diameter Ø 42 mm [±0,1 mm]
Height 25 mm [±0,1 mm]
Weight 306.31 g
Magnetization Direction ↑ axial
Load capacity ~ ? 58.67 kg / 575.60 N
Magnetic Induction ~ ? 389.14 mT / 3891 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 62x42x25 / 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

Physical simulation of the assembly - data

Presented values represent the outcome of a mathematical simulation. Values rely on algorithms for the material Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Treat these calculations as a reference point for designers.

Table 1: Static force (force vs distance) - power drop
MP 62x42x25 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4472 Gs
447.2 mT
 58.67 kg / 129.35 lbs
58670.0 g / 575.6 N
 critical level
1 mm 4338 Gs
433.8 mT
 55.21 kg / 121.72 lbs
55213.2 g / 541.6 N
 critical level
2 mm 4201 Gs
420.1 mT
 51.77 kg / 114.13 lbs
51768.5 g / 507.8 N
 critical level
3 mm 4061 Gs
406.1 mT
 48.39 kg / 106.69 lbs
48394.9 g / 474.8 N
 critical level
5 mm 3781 Gs
378.1 mT
 41.94 kg / 92.47 lbs
41942.4 g / 411.5 N
 critical level
10 mm 3097 Gs
309.7 mT
 28.15 kg / 62.06 lbs
28148.0 g / 276.1 N
 critical level
15 mm 2485 Gs
248.5 mT
 18.12 kg / 39.94 lbs
18118.5 g / 177.7 N
 critical level
20 mm 1972 Gs
197.2 mT
 11.41 kg / 25.16 lbs
11412.7 g / 112.0 N
 critical level
30 mm 1239 Gs
123.9 mT
 4.51 kg / 9.93 lbs
4505.2 g / 44.2 N
 medium risk
50 mm 533 Gs
53.3 mT
 0.83 kg / 1.84 lbs
832.4 g / 8.2 N
 low risk
Magnetic force decreases drastically with every subsequent millimeter of spacing. Keep in mind that every additional insulation layer (e.g., dirt, varnish, rust) strongly reduces the pull force. Magnetic products hold strongest during direct contact; gap kills the power. Observe how flashily the load capacity fall, when the product does not adhere tightly to the steel surface. When planning the assembly, discard additional spacers.

Table 2: Shear capacity (wall)
MP 62x42x25 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 11.73 kg / 25.87 lbs
11734.0 g / 115.1 N
1 mm Stal (~0.2) 11.04 kg / 24.34 lbs
11042.0 g / 108.3 N
2 mm Stal (~0.2) 10.35 kg / 22.83 lbs
10354.0 g / 101.6 N
3 mm Stal (~0.2) 9.68 kg / 21.34 lbs
9678.0 g / 94.9 N
5 mm Stal (~0.2) 8.39 kg / 18.49 lbs
8388.0 g / 82.3 N
10 mm Stal (~0.2) 5.63 kg / 12.41 lbs
5630.0 g / 55.2 N
15 mm Stal (~0.2) 3.62 kg / 7.99 lbs
3624.0 g / 35.6 N
20 mm Stal (~0.2) 2.28 kg / 5.03 lbs
2282.0 g / 22.4 N
30 mm Stal (~0.2) 0.90 kg / 1.99 lbs
902.0 g / 8.8 N
50 mm Stal (~0.2) 0.17 kg / 0.37 lbs
166.0 g / 1.6 N
The table below defines the theoretical force necessary to initiate the slippage of the magnet down along a vertical metal surface (considering standard friction). The holding force is a function of the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 62x42x25 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
17.60 kg / 38.80 lbs
17601.0 g / 172.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
11.73 kg / 25.87 lbs
11734.0 g / 115.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
5.87 kg / 12.93 lbs
5867.0 g / 57.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
29.34 kg / 64.67 lbs
29335.0 g / 287.8 N
When placing a element on a vertical wall (e.g., a board), it you can count on just about 1/5 of its nominal power. Gravity as well as a weak degree of grip influence the fact that holders slide down easier than they detach. Want to create a vertical fastening? Note that the shear force is noticeably lower than the maximum static pull force. On a painted metal, the holder will slip down under a significantly smaller cargo. Utilizing a rubberized layer can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 62x42x25 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 1.96 kg / 4.31 lbs
1955.7 g / 19.2 N
1 mm
8%
 4.89 kg / 10.78 lbs
4889.2 g / 48.0 N
2 mm
17%
 9.78 kg / 21.56 lbs
9778.3 g / 95.9 N
3 mm
25%
 14.67 kg / 32.34 lbs
14667.5 g / 143.9 N
5 mm
42%
 24.45 kg / 53.89 lbs
24445.8 g / 239.8 N
10 mm
83%
 48.89 kg / 107.79 lbs
48891.7 g / 479.6 N
11 mm
92%
 53.78 kg / 118.57 lbs
53780.8 g / 527.6 N
12 mm
100%
 58.67 kg / 129.35 lbs
58670.0 g / 575.6 N
A thin sheet is unable to take in the full magnetic flux, which weakens actual performance of the magnet. If you install a neodymium to a too thin substrate, the flux will pass right through and the holding will be smaller. To squeeze the maximum of this neodymium's power, you require a sufficiently solid element of metal. The saturation effect causes that on delicate walls (e.g., car bodies), the holder shows lower pull force. We suggest choosing the steel thickness based on the following data.

Table 5: Working in heat (stability) - resistance threshold
MP 62x42x25 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 58.67 kg / 129.35 lbs
58670.0 g / 575.6 N
 OK
40 °C -2.2% 57.38 kg / 126.50 lbs
57379.3 g / 562.9 N
 OK
60 °C -4.4% 56.09 kg / 123.65 lbs
56088.5 g / 550.2 N
 OK
80 °C -6.6% 54.80 kg / 120.81 lbs
54797.8 g / 537.6 N
100 °C -28.8% 41.77 kg / 92.09 lbs
41773.0 g / 409.8 N
Classic neodymiums change their properties power past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly damage this magnet. With increasing heat, the neodymium's force momentarily lowers. Avoid using this product close to ovens higher than its safe range. Ignoring the limit will result in irreversible degradation of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 62x42x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 264.93 kg / 584.07 lbs
5 588 Gs
39.74 kg / 87.61 lbs
39740 g / 389.8 N
 N/A
1 mm 257.19 kg / 567.00 lbs
8 812 Gs
38.58 kg / 85.05 lbs
38578 g / 378.4 N
 231.47 kg / 510.30 lbs
~0 Gs
2 mm 249.32 kg / 549.66 lbs
8 676 Gs
37.40 kg / 82.45 lbs
37398 g / 366.9 N
 224.39 kg / 494.69 lbs
~0 Gs
3 mm 241.51 kg / 532.44 lbs
8 539 Gs
36.23 kg / 79.87 lbs
36227 g / 355.4 N
 217.36 kg / 479.19 lbs
~0 Gs
5 mm 226.10 kg / 498.47 lbs
8 262 Gs
33.92 kg / 74.77 lbs
33915 g / 332.7 N
 203.49 kg / 448.62 lbs
~0 Gs
10 mm 189.40 kg / 417.55 lbs
7 562 Gs
28.41 kg / 62.63 lbs
28409 g / 278.7 N
 170.46 kg / 375.79 lbs
~0 Gs
20 mm 127.11 kg / 280.22 lbs
6 195 Gs
19.07 kg / 42.03 lbs
19066 g / 187.0 N
 114.40 kg / 252.20 lbs
~0 Gs
50 mm 32.28 kg / 71.17 lbs
3 122 Gs
4.84 kg / 10.68 lbs
4843 g / 47.5 N
 29.06 kg / 64.06 lbs
~0 Gs
60 mm 20.34 kg / 44.85 lbs
2 478 Gs
3.05 kg / 6.73 lbs
3052 g / 29.9 N
 18.31 kg / 40.36 lbs
~0 Gs
70 mm 12.99 kg / 28.63 lbs
1 980 Gs
1.95 kg / 4.29 lbs
1948 g / 19.1 N
 11.69 kg / 25.77 lbs
~0 Gs
80 mm 8.43 kg / 18.59 lbs
1 595 Gs
1.26 kg / 2.79 lbs
1265 g / 12.4 N
 7.59 kg / 16.73 lbs
~0 Gs
90 mm 5.58 kg / 12.29 lbs
1 298 Gs
0.84 kg / 1.84 lbs
836 g / 8.2 N
 5.02 kg / 11.06 lbs
~0 Gs
100 mm 3.76 kg / 8.29 lbs
1 065 Gs
0.56 kg / 1.24 lbs
564 g / 5.5 N
 3.38 kg / 7.46 lbs
~0 Gs
Two magnetic products attract each other from a significantly greater distance than a magnet and sheet setup. Such a system of magnet-to-magnet produces a massive flux and a wider radius of performance. Planning to create a strong closure? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the collision energy is extreme. The levitation is marginally weaker than the attraction, but still impressive.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Note: Estimates apply to friction force of two identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
MP 62x42x25 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 32.5 cm
Hearing aid 10 Gs (1.0 mT) 25.5 cm
Timepiece 20 Gs (2.0 mT) 20.0 cm
Mobile device 40 Gs (4.0 mT) 15.5 cm
Car key 50 Gs (5.0 mT) 14.0 cm
Payment card 400 Gs (40.0 mT) 6.0 cm
HDD hard drive 600 Gs (60.0 mT) 5.0 cm
Extremely neodym field poses a large risk to electronic devices and pacemakers. These neodymiums generate a field that disrupts operation of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MP 62x42x25 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.77 km/h
(5.21 m/s)
 4.16 J
30 mm 23.85 km/h
(6.63 m/s)
 6.72 J
50 mm 24.58 km/h
(6.83 m/s)
 7.14 J
100 mm 24.78 km/h
(6.88 m/s)
 7.26 J
Magnetic elements are prone to chipping – a strong collision with metal can result in shattering. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when working with large magnets.

Table 9: Surface protection spec
MP 62x42x25 / 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 (Pc)
MP 62x42x25 / N38

Parameter Value SI Unit / Description
Magnetic Flux 100 906 Mx 1009.1 µWb
Pc Coefficient 0.64 High (Stable)
Flux value emitted by the magnet pole. Essential parameter in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
MP 62x42x25 / N38

Environment Effective steel pull Effect
Air (land) 58.67 kg Standard
Water (riverbed) 67.18 kg
(+8.51 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.

1. Shear force

*Caution: On a vertical surface, the magnet holds just ~20% of its nominal pull.

2. Steel saturation

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

3. Thermal stability

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.64

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: 030205-2026
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The ring-shaped magnet MP 62x42x25 / 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 62x42x25 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.
A screw or bolt with a thread diameter smaller than 42 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 (62 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø62x25 mm and a weight of 306.31 g. The pulling force of this model is an impressive 58.67 kg, which translates to 575.60 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 42 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.

Pros and cons of neodymium magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • By covering with a smooth coating of silver, the element presents an nice look,
  • Magnetic induction on the working part of the magnet remains maximum,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in designing and the capacity to customize to client solutions,
  • Huge importance in high-tech industry – they serve a role in magnetic memories, electric motors, precision medical tools, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in small systems

Cons

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Limited ability of making nuts in the magnet and complicated forms - preferred is casing - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these devices can disrupt the diagnostic process 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

Magnetic strength at its maximum – what contributes to it?

Information about lifting capacity was defined for the most favorable conditions, including:
  • on a block made of structural steel, optimally conducting the magnetic flux
  • whose thickness is min. 10 mm
  • with an ground contact surface
  • without any clearance between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Lifting capacity in real conditions – factors

Effective lifting capacity is affected by specific conditions, mainly (from most important):
  • Clearance – existence of foreign body (rust, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material composition – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Skin irritation risks

Some people have a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Frequent touching might lead to skin redness. We strongly advise use safety gloves.

Electronic devices

Equipment safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Bone fractures

Big blocks can break fingers in a fraction of a second. Never put your hand between two strong magnets.

Magnetic interference

A strong magnetic field interferes with the operation of magnetometers in phones and navigation systems. Maintain magnets near a device to avoid damaging the sensors.

Handling guide

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Pacemakers

For implant holders: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Material brittleness

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Combustion hazard

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Operating temperature

Avoid heat. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Danger to the youngest

Strictly store magnets away from children. Risk of swallowing is high, and the effects of magnets connecting inside the body are fatal.

Safety First! Want to know more? Read our article: Why are neodymium magnets dangerous?