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MP 14x8/4x3 / N38 - ring magnet

ring magnet

Catalog no 030181

GTIN/EAN: 5906301811985

5.00
Load capacity 2.53 kg / 24.85 N Magnetic Induction 244.11 mT / 2441 Gs
Diameter
14 mm [±0,1 mm]
internal diameter Ø
8/4 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
3.18 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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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 14x8/4x3 / N38 - ring magnet

Specification / characteristics - MP 14x8/4x3 / N38 - ring magnet

properties
properties values
Cat. no. 030181
GTIN/EAN 5906301811985
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 14 mm [±0,1 mm]
internal diameter Ø 8/4 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 3.18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.53 kg / 24.85 N
Magnetic Induction ~ ? 244.11 mT / 2441 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 14x8/4x3 / 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

Physical analysis of the product - data

Presented values are the direct effect of a mathematical calculation. Values were calculated on algorithms for the class Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MP 14x8/4x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2121 Gs
212.1 mT
 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
 strong
1 mm 1927 Gs
192.7 mT
 2.09 kg / 4.61 LBS
2090.1 g / 20.5 N
 strong
2 mm 1676 Gs
167.6 mT
 1.58 kg / 3.48 LBS
1579.6 g / 15.5 N
 safe
3 mm 1410 Gs
141.0 mT
 1.12 kg / 2.46 LBS
1117.9 g / 11.0 N
 safe
5 mm 943 Gs
94.3 mT
 0.50 kg / 1.10 LBS
500.1 g / 4.9 N
 safe
10 mm 335 Gs
33.5 mT
 0.06 kg / 0.14 LBS
63.3 g / 0.6 N
 safe
15 mm 140 Gs
14.0 mT
 0.01 kg / 0.02 LBS
11.1 g / 0.1 N
 safe
20 mm 69 Gs
6.9 mT
 0.00 kg / 0.01 LBS
2.7 g / 0.0 N
 safe
30 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 LBS
0.3 g / 0.0 N
 safe
50 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
Grip strength weakens sharply with every mm of gap. Remember that even a microscopic distance (e.g., dirt, varnish, dust) strongly reduces the pull force. Neodymiums work strongest in perfect adhesion; air break kills the power. See how flashily the parameters fall, when the product does not touch tightly to the metal substrate. When designing the assembly, avoid redundant distances.

Table 2: Vertical capacity (vertical surface)
MP 14x8/4x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.51 kg / 1.12 LBS
506.0 g / 5.0 N
1 mm Stal (~0.2) 0.42 kg / 0.92 LBS
418.0 g / 4.1 N
2 mm Stal (~0.2) 0.32 kg / 0.70 LBS
316.0 g / 3.1 N
3 mm Stal (~0.2) 0.22 kg / 0.49 LBS
224.0 g / 2.2 N
5 mm Stal (~0.2) 0.10 kg / 0.22 LBS
100.0 g / 1.0 N
10 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data presents the theoretical weight limit required to start the slippage of the magnet down against a upright metal surface (assuming standard friction coefficient). This parameter is a function of the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 14x8/4x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.76 kg / 1.67 LBS
759.0 g / 7.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.51 kg / 1.12 LBS
506.0 g / 5.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.25 kg / 0.56 LBS
253.0 g / 2.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.27 kg / 2.79 LBS
1265.0 g / 12.4 N
When hanging a holder on a upright wall (e.g., a fridge), it will only hold only about 1/5 of its nominal power. Gravitational force and a weak degree of grip mean that products move down faster than they detach. Designing a hanger? Consider that the sliding force is much weaker than the maximum static pull force. On a painted metal, the element will slip down under a much lighter load. Application of an anti-slip coating can effectively improve the result.

Table 4: Material efficiency (saturation) - power losses
MP 14x8/4x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.25 kg / 0.56 LBS
253.0 g / 2.5 N
1 mm
25%
 0.63 kg / 1.39 LBS
632.5 g / 6.2 N
2 mm
50%
 1.27 kg / 2.79 LBS
1265.0 g / 12.4 N
3 mm
75%
 1.90 kg / 4.18 LBS
1897.5 g / 18.6 N
5 mm
100%
 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
10 mm
100%
 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
11 mm
100%
 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
12 mm
100%
 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
A thin metal plate is not enough to absorb the full magnetic flux, which squanders power of the holder. If you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you require a sufficiently solid element of metal. The material oversaturation means that on sheet metal structures (e.g., thin profiles), the holder holds weaker. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal stability (stability) - resistance threshold
MP 14x8/4x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
 OK
40 °C -2.2% 2.47 kg / 5.45 LBS
2474.3 g / 24.3 N
 OK
60 °C -4.4% 2.42 kg / 5.33 LBS
2418.7 g / 23.7 N
80 °C -6.6% 2.36 kg / 5.21 LBS
2363.0 g / 23.2 N
100 °C -28.8% 1.80 kg / 3.97 LBS
1801.4 g / 17.7 N
Classic neodymiums change their properties power past the thermal threshold. Avoid high temperatures – heat can permanently demagnetize this product. With every degree above norm, the magnet's power momentarily decreases. Do not use this product close to ovens higher than its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress compared to rod magnets. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 14x8/4x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.33 kg / 7.34 LBS
3 647 Gs
0.50 kg / 1.10 LBS
500 g / 4.9 N
 N/A
1 mm 3.07 kg / 6.76 LBS
4 070 Gs
0.46 kg / 1.01 LBS
460 g / 4.5 N
 2.76 kg / 6.09 LBS
~0 Gs
2 mm 2.75 kg / 6.07 LBS
3 855 Gs
0.41 kg / 0.91 LBS
413 g / 4.0 N
 2.48 kg / 5.46 LBS
~0 Gs
3 mm 2.42 kg / 5.33 LBS
3 612 Gs
0.36 kg / 0.80 LBS
362 g / 3.6 N
 2.17 kg / 4.79 LBS
~0 Gs
5 mm 1.76 kg / 3.88 LBS
3 084 Gs
0.26 kg / 0.58 LBS
264 g / 2.6 N
 1.59 kg / 3.50 LBS
~0 Gs
10 mm 0.66 kg / 1.45 LBS
1 886 Gs
0.10 kg / 0.22 LBS
99 g / 1.0 N
 0.59 kg / 1.31 LBS
~0 Gs
20 mm 0.08 kg / 0.18 LBS
671 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
 0.08 kg / 0.17 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
77 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
47 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
31 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
21 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
15 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
11 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products interact from a much further distance than a magnet and steel setup. The connection of two magnets creates a more powerful interaction and a larger range of operation. Designing a solid fastener? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the pinch force is massive. The repulsion force is slightly lower than the connection force, but still significant.
*Field value for N-N configuration drops to ~0 Gs in the exact middle of the gap (due to field cancellation).
Attention: Results show friction force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
MP 14x8/4x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.5 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Mobile device 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation poses a large risk to IT equipment and pacemakers. These magnets produce a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MP 14x8/4x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.43 km/h
(7.07 m/s)
 0.08 J
30 mm 25.72 km/h
(7.15 m/s)
 0.08 J
50 mm 25.73 km/h
(7.15 m/s)
 0.08 J
100 mm 25.73 km/h
(7.15 m/s)
 0.08 J
Neodymium magnets are delicate – a collision with steel can result in shattering. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or injury to skin. Hold the magnet firmly during installation so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Use safety goggles when working with large magnets.

Table 9: Surface protection spec
MP 14x8/4x3 / 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: Construction data (Pc)
MP 14x8/4x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 101 Mx 31.0 µWb
Pc Coefficient 0.28 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter when building generators and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
MP 14x8/4x3 / N38

Environment Effective steel pull Effect
Air (land) 2.53 kg Standard
Water (riverbed) 2.90 kg
(+0.37 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

1. Shear force

*Caution: On a vertical wall, the magnet retains just ~20% of its max power.

2. Efficiency vs thickness

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

3. Thermal stability

*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) = 0.28

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 specification and ecology

Material specification

iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%

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: 030181-2026
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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 2.53 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 14x8/4x3 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. 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.
The inner hole diameter determines the maximum size of the mounting element. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø14 mm (outer diameter) and height 3 mm. The pulling force of this model is an impressive 2.53 kg, which translates to 24.85 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8/4 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths and weaknesses of neodymium magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose power, even over nearly 10 years – the drop in strength is only ~1% (theoretically),
  • They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • Thanks to the smooth finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an professional appearance,
  • Magnets are distinguished by extremely high magnetic induction on the working surface,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures approaching 230°C and above...
  • Possibility of exact shaping as well as adapting to precise conditions,
  • Universal use in modern technologies – they are commonly used in HDD drives, electric drive systems, medical equipment, as well as multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Cons

Cons of neodymium magnets and ways of using them
  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their power 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
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating nuts and complex forms in magnets, we recommend using casing - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these products are able to complicate diagnosis medical in case of swallowing.
  • Due to expensive raw materials, their price is relatively high,

Holding force characteristics

Maximum lifting capacity of the magnet – what affects it?

The load parameter shown represents the limit force, recorded under optimal environment, namely:
  • with the use of a yoke made of low-carbon steel, ensuring maximum field concentration
  • possessing a thickness of at least 10 mm to avoid saturation
  • characterized by even structure
  • with total lack of distance (without impurities)
  • under axial application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Real force is influenced by working environment parameters, such as (from priority):
  • Air gap (between the magnet and the metal), as even a very small distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
  • Steel thickness – too thin steel does not close the flux, causing part of the flux to be wasted to the other side.
  • Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Beware of splinters

Neodymium magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets leads to them breaking into small pieces.

Nickel allergy

Certain individuals experience a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact might lead to a rash. We strongly advise use protective gloves.

Implant safety

People with a heart stimulator must keep an safe separation from magnets. The magnetism can interfere with the functioning of the life-saving device.

Bodily injuries

Mind your fingers. Two powerful magnets will snap together instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Flammability

Mechanical processing of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Maximum temperature

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Data carriers

Do not bring magnets near a wallet, computer, or TV. The magnetism can permanently damage these devices and wipe information from cards.

GPS and phone interference

A powerful magnetic field disrupts the operation of compasses in phones and GPS navigation. Keep magnets close to a smartphone to avoid damaging the sensors.

No play value

Adult use only. Tiny parts can be swallowed, leading to intestinal necrosis. Keep away from children and animals.

Conscious usage

Be careful. Neodymium magnets attract from a distance and snap with huge force, often faster than you can move away.

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