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MPL 20x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020129

GTIN/EAN: 5906301811350

5.00

length

20 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

60 g

Magnetization Direction

↑ axial

Load capacity

15.40 kg / 151.12 N

Magnetic Induction

540.22 mT / 5402 Gs

Coating

[NiCuNi] Nickel

33.21 with VAT / pcs + price for transport

27.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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Product card - MPL 20x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 20x20x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020129
GTIN/EAN 5906301811350
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 20 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 60 g
Magnetization Direction ↑ axial
Load capacity ~ ? 15.40 kg / 151.12 N
Magnetic Induction ~ ? 540.22 mT / 5402 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x20x20 / 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

Technical simulation of the product - technical parameters

These data constitute the outcome of a physical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Operational performance may deviate from the simulation results. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - characteristics
MPL 20x20x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5400 Gs
540.0 mT
15.40 kg / 33.95 lbs
15400.0 g / 151.1 N
crushing
1 mm 4910 Gs
491.0 mT
12.73 kg / 28.07 lbs
12732.2 g / 124.9 N
crushing
2 mm 4423 Gs
442.3 mT
10.33 kg / 22.77 lbs
10328.3 g / 101.3 N
crushing
3 mm 3955 Gs
395.5 mT
8.26 kg / 18.21 lbs
8258.3 g / 81.0 N
strong
5 mm 3114 Gs
311.4 mT
5.12 kg / 11.29 lbs
5120.3 g / 50.2 N
strong
10 mm 1671 Gs
167.1 mT
1.48 kg / 3.25 lbs
1475.0 g / 14.5 N
low risk
15 mm 936 Gs
93.6 mT
0.46 kg / 1.02 lbs
463.0 g / 4.5 N
low risk
20 mm 562 Gs
56.2 mT
0.17 kg / 0.37 lbs
167.1 g / 1.6 N
low risk
30 mm 244 Gs
24.4 mT
0.03 kg / 0.07 lbs
31.3 g / 0.3 N
low risk
50 mm 73 Gs
7.3 mT
0.00 kg / 0.01 lbs
2.8 g / 0.0 N
low risk

Table 2: Vertical load (wall)
MPL 20x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.08 kg / 6.79 lbs
3080.0 g / 30.2 N
1 mm Stal (~0.2) 2.55 kg / 5.61 lbs
2546.0 g / 25.0 N
2 mm Stal (~0.2) 2.07 kg / 4.55 lbs
2066.0 g / 20.3 N
3 mm Stal (~0.2) 1.65 kg / 3.64 lbs
1652.0 g / 16.2 N
5 mm Stal (~0.2) 1.02 kg / 2.26 lbs
1024.0 g / 10.0 N
10 mm Stal (~0.2) 0.30 kg / 0.65 lbs
296.0 g / 2.9 N
15 mm Stal (~0.2) 0.09 kg / 0.20 lbs
92.0 g / 0.9 N
20 mm Stal (~0.2) 0.03 kg / 0.07 lbs
34.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MPL 20x20x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.62 kg / 10.19 lbs
4620.0 g / 45.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.08 kg / 6.79 lbs
3080.0 g / 30.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.54 kg / 3.40 lbs
1540.0 g / 15.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.70 kg / 16.98 lbs
7700.0 g / 75.5 N

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 20x20x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.77 kg / 1.70 lbs
770.0 g / 7.6 N
1 mm
13%
1.93 kg / 4.24 lbs
1925.0 g / 18.9 N
2 mm
25%
3.85 kg / 8.49 lbs
3850.0 g / 37.8 N
3 mm
38%
5.78 kg / 12.73 lbs
5775.0 g / 56.7 N
5 mm
63%
9.63 kg / 21.22 lbs
9625.0 g / 94.4 N
10 mm
100%
15.40 kg / 33.95 lbs
15400.0 g / 151.1 N
11 mm
100%
15.40 kg / 33.95 lbs
15400.0 g / 151.1 N
12 mm
100%
15.40 kg / 33.95 lbs
15400.0 g / 151.1 N

Table 5: Working in heat (material behavior) - resistance threshold
MPL 20x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 15.40 kg / 33.95 lbs
15400.0 g / 151.1 N
OK
40 °C -2.2% 15.06 kg / 33.20 lbs
15061.2 g / 147.8 N
OK
60 °C -4.4% 14.72 kg / 32.46 lbs
14722.4 g / 144.4 N
OK
80 °C -6.6% 14.38 kg / 31.71 lbs
14383.6 g / 141.1 N
100 °C -28.8% 10.96 kg / 24.17 lbs
10964.8 g / 107.6 N

Table 6: Two magnets (attraction) - field collision
MPL 20x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 71.92 kg / 158.55 lbs
5 962 Gs
10.79 kg / 23.78 lbs
10787 g / 105.8 N
N/A
1 mm 65.60 kg / 144.63 lbs
10 316 Gs
9.84 kg / 21.69 lbs
9840 g / 96.5 N
59.04 kg / 130.16 lbs
~0 Gs
2 mm 59.46 kg / 131.08 lbs
9 821 Gs
8.92 kg / 19.66 lbs
8919 g / 87.5 N
53.51 kg / 117.97 lbs
~0 Gs
3 mm 53.66 kg / 118.30 lbs
9 329 Gs
8.05 kg / 17.74 lbs
8049 g / 79.0 N
48.29 kg / 106.47 lbs
~0 Gs
5 mm 43.20 kg / 95.24 lbs
8 371 Gs
6.48 kg / 14.29 lbs
6480 g / 63.6 N
38.88 kg / 85.71 lbs
~0 Gs
10 mm 23.91 kg / 52.72 lbs
6 228 Gs
3.59 kg / 7.91 lbs
3587 g / 35.2 N
21.52 kg / 47.44 lbs
~0 Gs
20 mm 6.89 kg / 15.19 lbs
3 343 Gs
1.03 kg / 2.28 lbs
1033 g / 10.1 N
6.20 kg / 13.67 lbs
~0 Gs
50 mm 0.32 kg / 0.71 lbs
721 Gs
0.05 kg / 0.11 lbs
48 g / 0.5 N
0.29 kg / 0.64 lbs
~0 Gs
60 mm 0.15 kg / 0.32 lbs
487 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
0.13 kg / 0.29 lbs
~0 Gs
70 mm 0.07 kg / 0.16 lbs
344 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
0.07 kg / 0.14 lbs
~0 Gs
80 mm 0.04 kg / 0.09 lbs
251 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
0.04 kg / 0.08 lbs
~0 Gs
90 mm 0.02 kg / 0.05 lbs
189 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.04 lbs
~0 Gs
100 mm 0.01 kg / 0.03 lbs
146 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
0.01 kg / 0.03 lbs
~0 Gs

Table 7: Protective zones (electronics) - warnings
MPL 20x20x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.0 cm
Hearing aid 10 Gs (1.0 mT) 11.0 cm
Timepiece 20 Gs (2.0 mT) 8.5 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm

Table 8: Dynamics (kinetic energy) - collision effects
MPL 20x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.10 km/h
(4.75 m/s)
0.68 J
30 mm 28.02 km/h
(7.78 m/s)
1.82 J
50 mm 36.13 km/h
(10.04 m/s)
3.02 J
100 mm 51.09 km/h
(14.19 m/s)
6.04 J

Table 9: Corrosion resistance
MPL 20x20x20 / 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)

Table 10: Construction data (Flux)
MPL 20x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 017 Mx 220.2 µWb
Pc Coefficient 0.84 High (Stable)

Table 11: Hydrostatics and buoyancy
MPL 20x20x20 / N38

Environment Effective steel pull Effect
Air (land) 15.40 kg Standard
Water (riverbed) 17.63 kg
(+2.23 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains only approx. 20-30% of its max power.

2. Steel thickness impact

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.84

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

Engineering data and GPSR
Material specification
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Environmental data
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020129-2026
Quick Unit Converter
Force (pull)

Magnetic Field

Other deals

This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 20x20x20 mm and a weight of 60 g, guarantees the highest quality connection. As a block magnet with high power (approx. 15.40 kg), this product is available immediately from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is shifting 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. Watch your fingers! Magnets with a force of 15.40 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 20x20x20 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 20x20x20 / N38 model is magnetized through the thickness (dimension 20 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (20x20 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
The presented product is a neodymium magnet with precisely defined parameters: 20 mm (length), 20 mm (width), and 20 mm (thickness). It is a magnetic block with dimensions 20x20x20 mm and a self-weight of 60 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of rare earth magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain full power for nearly 10 years – the loss is just ~1% (according to analyses),
  • Neodymium magnets prove to be extremely resistant to loss of magnetic properties caused by magnetic disturbances,
  • A magnet with a smooth silver surface looks better,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to modularity in shaping and the ability to adapt to complex applications,
  • Versatile presence in modern technologies – they find application in computer drives, motor assemblies, precision medical tools, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in miniature devices

Weaknesses

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of creating nuts in the magnet and complicated forms - recommended is casing - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Highest magnetic holding forcewhat it depends on?

The lifting capacity listed is a measurement result executed under the following configuration:
  • on a block made of mild steel, effectively closing the magnetic field
  • with a thickness minimum 10 mm
  • characterized by smoothness
  • with total lack of distance (without impurities)
  • during pulling in a direction perpendicular to the plane
  • at ambient temperature room level

Magnet lifting force in use – key factors

Holding efficiency is influenced by working environment parameters, including (from priority):
  • Gap (between the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick plate causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Smoothness – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Temperature – heating the magnet 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 optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the load capacity.

Safe handling of NdFeB magnets
Immense force

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

Keep away from electronics

GPS units and smartphones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Fire warning

Dust generated during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Fragile material

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

Serious injuries

Danger of trauma: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Safe distance

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

Danger to the youngest

NdFeB magnets are not suitable for play. Accidental ingestion of a few magnets may result in them attracting across intestines, which poses a severe health hazard and requires urgent medical intervention.

Allergy Warning

Some people suffer from a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Extended handling might lead to dermatitis. We suggest use protective gloves.

Permanent damage

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

ICD Warning

People with a pacemaker should maintain an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Safety First! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98