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MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020397

GTIN/EAN: 5906301811909

5.00

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

15 g

Magnetization Direction

↑ axial

Load capacity

11.85 kg / 116.27 N

Magnetic Induction

321.37 mT / 3214 Gs

Coating

[NiCuNi] Nickel

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9.93 ZŁ with VAT / pcs + price for transport

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Technical - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020397
GTIN/EAN 5906301811909
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 40 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 15 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.85 kg / 116.27 N
Magnetic Induction ~ ? 321.37 mT / 3214 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x5x2[7/3.5] / N38 - lamellar 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

The following information are the direct effect of a physical analysis. Values were calculated on models for the class Nd2Fe14B. Actual parameters may differ. Treat these calculations as a supplementary guide for designers.

Table 1: Static pull force (force vs gap) - interaction chart
MPL 40x10x5x2[7/3.5] / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3212 Gs
321.2 mT
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
 crushing
1 mm 2791 Gs
279.1 mT
 8.95 kg / 19.73 pounds
8947.7 g / 87.8 N
 warning
2 mm 2358 Gs
235.8 mT
 6.38 kg / 14.08 pounds
6384.9 g / 62.6 N
 warning
3 mm 1965 Gs
196.5 mT
 4.43 kg / 9.77 pounds
4432.4 g / 43.5 N
 warning
5 mm 1360 Gs
136.0 mT
 2.12 kg / 4.68 pounds
2122.9 g / 20.8 N
 warning
10 mm 615 Gs
61.5 mT
 0.43 kg / 0.96 pounds
434.1 g / 4.3 N
 weak grip
15 mm 329 Gs
32.9 mT
 0.12 kg / 0.27 pounds
124.5 g / 1.2 N
 weak grip
20 mm 195 Gs
19.5 mT
 0.04 kg / 0.10 pounds
43.9 g / 0.4 N
 weak grip
30 mm 83 Gs
8.3 mT
 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
 weak grip
50 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 pounds
0.6 g / 0.0 N
 weak grip
Grip strength decreases drastically with every subsequent millimeter of distance. Keep in mind that even a microscopic distance (e.g., contamination, paint, veneer) significantly reduces the pull force. Magnets hold optimally in perfect adhesion; air break weakens the force. See how quickly the pull force drop, when the product does not touch tightly to the steel surface. When calculating the assembly, avoid redundant distances.

Table 2: Sliding load (wall)
MPL 40x10x5x2[7/3.5] / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.37 kg / 5.22 pounds
2370.0 g / 23.2 N
1 mm Stal (~0.2) 1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
2 mm Stal (~0.2) 1.28 kg / 2.81 pounds
1276.0 g / 12.5 N
3 mm Stal (~0.2) 0.89 kg / 1.95 pounds
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.42 kg / 0.93 pounds
424.0 g / 4.2 N
10 mm Stal (~0.2) 0.09 kg / 0.19 pounds
86.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data indicates the approximate weight limit required to initiate the shifting of the magnet downwards on a vertical steel wall (considering typical friction). This value is relative to the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 40x10x5x2[7/3.5] / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.55 kg / 7.84 pounds
3555.0 g / 34.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.37 kg / 5.22 pounds
2370.0 g / 23.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.19 kg / 2.61 pounds
1185.0 g / 11.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.93 kg / 13.06 pounds
5925.0 g / 58.1 N
When placing a holder on a vertical surface (e.g., a board), it you can count on just about 1/5 of its nominal power. Gravitational force and a weak degree of grip mean that magnets move down easier than they detach. Designing a vertical fastening? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a noticeably lighter cargo. Using a rubber coating can significantly improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 40x10x5x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.59 kg / 1.31 pounds
592.5 g / 5.8 N
1 mm
13%
 1.48 kg / 3.27 pounds
1481.3 g / 14.5 N
2 mm
25%
 2.96 kg / 6.53 pounds
2962.5 g / 29.1 N
3 mm
38%
 4.44 kg / 9.80 pounds
4443.8 g / 43.6 N
5 mm
63%
 7.41 kg / 16.33 pounds
7406.3 g / 72.7 N
10 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
11 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
12 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
A thin metal plate is incapable of focus the entire magnetic field, which wastes potential of the holder. Should you install a neodymium to a too thin substrate, the field will penetrate right through and the holding will be smaller. To achieve the maximum of this magnet's potential, you require a sufficiently solid backing of steel. The saturation phenomenon means that on delicate walls (e.g., car bodies), the product holds weaker. We advise picking the steel dimension based on the following data.

Table 5: Thermal stability (material behavior) - resistance threshold
MPL 40x10x5x2[7/3.5] / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
 OK
40 °C -2.2% 11.59 kg / 25.55 pounds
11589.3 g / 113.7 N
 OK
60 °C -4.4% 11.33 kg / 24.98 pounds
11328.6 g / 111.1 N
80 °C -6.6% 11.07 kg / 24.40 pounds
11067.9 g / 108.6 N
100 °C -28.8% 8.44 kg / 18.60 pounds
8437.2 g / 82.8 N
Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Avoid high temperatures – excessive heat can permanently damage this product. With increasing heat, the magnet's capacity briefly lowers. Refrain from using this magnet in hot environments exceeding its working range. Exceeding the critical threshold will result in permanent loss of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) are more susceptible to demagnetization sooner compared to rod magnets. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 40x10x5x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 25.44 kg / 56.10 pounds
4 569 Gs
3.82 kg / 8.41 pounds
3817 g / 37.4 N
 N/A
1 mm 22.33 kg / 49.22 pounds
6 018 Gs
3.35 kg / 7.38 pounds
3349 g / 32.9 N
 20.09 kg / 44.30 pounds
~0 Gs
2 mm 19.21 kg / 42.36 pounds
5 582 Gs
2.88 kg / 6.35 pounds
2882 g / 28.3 N
 17.29 kg / 38.12 pounds
~0 Gs
3 mm 16.31 kg / 35.96 pounds
5 144 Gs
2.45 kg / 5.39 pounds
2447 g / 24.0 N
 14.68 kg / 32.36 pounds
~0 Gs
5 mm 11.45 kg / 25.23 pounds
4 309 Gs
1.72 kg / 3.78 pounds
1717 g / 16.8 N
 10.30 kg / 22.71 pounds
~0 Gs
10 mm 4.56 kg / 10.05 pounds
2 719 Gs
0.68 kg / 1.51 pounds
684 g / 6.7 N
 4.10 kg / 9.04 pounds
~0 Gs
20 mm 0.93 kg / 2.05 pounds
1 230 Gs
0.14 kg / 0.31 pounds
140 g / 1.4 N
 0.84 kg / 1.85 pounds
~0 Gs
50 mm 0.04 kg / 0.08 pounds
249 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.03 kg / 0.08 pounds
~0 Gs
60 mm 0.02 kg / 0.04 pounds
167 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.03 pounds
~0 Gs
70 mm 0.01 kg / 0.02 pounds
116 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
84 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
62 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
48 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets attract each other from a significantly greater distance than a neodymium and metal setup. Such a system of magnet-to-magnet generates a stronger field and a further horizon of operation. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The levitation is a bit weaker than the connection force, but still impressive.
*Field value between like poles is approximately ~0 Gs at the midpoint of the gap (due to field cancellation).
* Estimates apply to friction force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - precautionary measures
MPL 40x10x5x2[7/3.5] / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Mechanical watch 20 Gs (2.0 mT) 5.5 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a serious hazard to electronic devices as well as pacemakers. These magnets produce a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field acts through matter and plastic. Exceptional care must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MPL 40x10x5x2[7/3.5] / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.99 km/h
(8.05 m/s)
 0.49 J
30 mm 49.12 km/h
(13.64 m/s)
 1.40 J
50 mm 63.39 km/h
(17.61 m/s)
 2.33 J
100 mm 89.64 km/h
(24.90 m/s)
 4.65 J
Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Impact energy can destroy the magnet or injury to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 40x10x5x2[7/3.5] / 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: Construction data (Flux)
MPL 40x10x5x2[7/3.5] / N38

Parameter Value SI Unit / Description
Magnetic Flux 11 419 Mx 114.2 µWb
Pc Coefficient 0.31 Low (Flat)
Flux value emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MPL 40x10x5x2[7/3.5] / N38

Environment Effective steel pull Effect
Air (land) 11.85 kg Standard
Water (riverbed) 13.57 kg
(+1.72 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Note: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically reduces 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) = 0.31

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

Technical and environmental data
Elemental analysis
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: 020397-2026
Measurement Calculator
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Model MPL 40x10x5x2[7/3.5] / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 11.85 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 40x10x5x2[7/3.5] / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 40x10x5x2[7/3.5] / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 11.85 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x10x5x2[7/3.5] / N38 model is magnetized through the thickness (dimension 5 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 40x10x5 mm, which, at a weight of 15 g, makes it an element with high energy density. It is a magnetic block with dimensions 40x10x5 mm and a self-weight of 15 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of neodymium magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
  • They are resistant to demagnetization induced by external field influence,
  • The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the working part of the magnet remains exceptional,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in constructing and the capacity to adapt to client solutions,
  • Wide application in innovative solutions – they serve a role in HDD drives, motor assemblies, medical devices, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in miniature devices

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making threads in the magnet and complicated shapes - preferred is cover - magnetic holder.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

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

The force parameter is a result of laboratory testing conducted under the following configuration:
  • with the contact of a yoke made of special test steel, guaranteeing maximum field concentration
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with an ground touching surface
  • under conditions of ideal adhesion (metal-to-metal)
  • during pulling in a direction vertical to the mounting surface
  • at temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

In practice, the real power depends on many variables, presented from the 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 magnet efficiency, often by half at just 0.5 mm.
  • Load vector – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Material type – ideal substrate is high-permeability steel. Cast iron may attract less.
  • Base smoothness – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Danger to pacemakers

Warning for patients: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Caution required

Exercise caution. Neodymium magnets attract from a distance and connect with huge force, often faster than you can react.

Machining danger

Machining of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Operating temperature

Keep cool. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Magnetic interference

Be aware: rare earth magnets generate a field that confuses sensitive sensors. Maintain a safe distance from your mobile, device, and GPS.

Material brittleness

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Finger safety

Protect your hands. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Keep away from children

Absolutely store magnets out of reach of children. Choking hazard is significant, and the effects of magnets connecting inside the body are tragic.

Sensitization to coating

Certain individuals experience a contact allergy to Ni, which is the common plating for NdFeB magnets. Prolonged contact might lead to an allergic reaction. It is best to use protective gloves.

Safe distance

Intense magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Warning! Looking for details? Check our post: Are neodymium magnets dangerous?