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MPL 20x8x6 / N38 - lamellar magnet

lamellar magnet

Catalog no 020134

GTIN/EAN: 5906301811404

5.00

length

20 mm [±0,1 mm]

Width

8 mm [±0,1 mm]

Height

6 mm [±0,1 mm]

Weight

7.2 g

Magnetization Direction

↑ axial

Load capacity

6.27 kg / 61.50 N

Magnetic Induction

423.90 mT / 4239 Gs

Coating

[NiCuNi] Nickel

5.17 with VAT / pcs + price for transport

4.20 ZŁ net + 23% VAT / pcs

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Physical properties - MPL 20x8x6 / N38 - lamellar magnet

Specification / characteristics - MPL 20x8x6 / N38 - lamellar magnet

properties
properties values
Cat. no. 020134
GTIN/EAN 5906301811404
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 8 mm [±0,1 mm]
Height 6 mm [±0,1 mm]
Weight 7.2 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.27 kg / 61.50 N
Magnetic Induction ~ ? 423.90 mT / 4239 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x8x6 / 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

Engineering modeling of the magnet - technical parameters

The following data constitute the direct effect of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Treat these data as a reference point during assembly planning.

Table 1: Static force (pull vs gap) - characteristics
MPL 20x8x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4236 Gs
423.6 mT
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
medium risk
1 mm 3505 Gs
350.5 mT
4.29 kg / 9.47 lbs
4293.5 g / 42.1 N
medium risk
2 mm 2814 Gs
281.4 mT
2.77 kg / 6.10 lbs
2766.9 g / 27.1 N
medium risk
3 mm 2235 Gs
223.5 mT
1.75 kg / 3.85 lbs
1745.9 g / 17.1 N
safe
5 mm 1425 Gs
142.5 mT
0.71 kg / 1.56 lbs
709.0 g / 7.0 N
safe
10 mm 540 Gs
54.0 mT
0.10 kg / 0.22 lbs
101.9 g / 1.0 N
safe
15 mm 248 Gs
24.8 mT
0.02 kg / 0.05 lbs
21.5 g / 0.2 N
safe
20 mm 131 Gs
13.1 mT
0.01 kg / 0.01 lbs
6.0 g / 0.1 N
safe
30 mm 48 Gs
4.8 mT
0.00 kg / 0.00 lbs
0.8 g / 0.0 N
safe
50 mm 12 Gs
1.2 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
safe

Table 2: Sliding capacity (wall)
MPL 20x8x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.25 kg / 2.76 lbs
1254.0 g / 12.3 N
1 mm Stal (~0.2) 0.86 kg / 1.89 lbs
858.0 g / 8.4 N
2 mm Stal (~0.2) 0.55 kg / 1.22 lbs
554.0 g / 5.4 N
3 mm Stal (~0.2) 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
5 mm Stal (~0.2) 0.14 kg / 0.31 lbs
142.0 g / 1.4 N
10 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 20x8x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.88 kg / 4.15 lbs
1881.0 g / 18.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.25 kg / 2.76 lbs
1254.0 g / 12.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.63 kg / 1.38 lbs
627.0 g / 6.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.14 kg / 6.91 lbs
3135.0 g / 30.8 N

Table 4: Material efficiency (saturation) - power losses
MPL 20x8x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.63 kg / 1.38 lbs
627.0 g / 6.2 N
1 mm
25%
1.57 kg / 3.46 lbs
1567.5 g / 15.4 N
2 mm
50%
3.14 kg / 6.91 lbs
3135.0 g / 30.8 N
3 mm
75%
4.70 kg / 10.37 lbs
4702.5 g / 46.1 N
5 mm
100%
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
10 mm
100%
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
11 mm
100%
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
12 mm
100%
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N

Table 5: Thermal stability (stability) - thermal limit
MPL 20x8x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
OK
40 °C -2.2% 6.13 kg / 13.52 lbs
6132.1 g / 60.2 N
OK
60 °C -4.4% 5.99 kg / 13.21 lbs
5994.1 g / 58.8 N
80 °C -6.6% 5.86 kg / 12.91 lbs
5856.2 g / 57.4 N
100 °C -28.8% 4.46 kg / 9.84 lbs
4464.2 g / 43.8 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 20x8x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.70 kg / 39.02 lbs
5 386 Gs
2.66 kg / 5.85 lbs
2655 g / 26.0 N
N/A
1 mm 14.82 kg / 32.66 lbs
7 751 Gs
2.22 kg / 4.90 lbs
2222 g / 21.8 N
13.33 kg / 29.40 lbs
~0 Gs
2 mm 12.12 kg / 26.72 lbs
7 011 Gs
1.82 kg / 4.01 lbs
1818 g / 17.8 N
10.91 kg / 24.05 lbs
~0 Gs
3 mm 9.78 kg / 21.55 lbs
6 296 Gs
1.47 kg / 3.23 lbs
1466 g / 14.4 N
8.80 kg / 19.40 lbs
~0 Gs
5 mm 6.21 kg / 13.69 lbs
5 018 Gs
0.93 kg / 2.05 lbs
932 g / 9.1 N
5.59 kg / 12.32 lbs
~0 Gs
10 mm 2.00 kg / 4.41 lbs
2 849 Gs
0.30 kg / 0.66 lbs
300 g / 2.9 N
1.80 kg / 3.97 lbs
~0 Gs
20 mm 0.29 kg / 0.63 lbs
1 080 Gs
0.04 kg / 0.10 lbs
43 g / 0.4 N
0.26 kg / 0.57 lbs
~0 Gs
50 mm 0.01 kg / 0.01 lbs
153 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
97 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
65 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
45 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
33 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
25 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Hazards (electronics) - warnings
MPL 20x8x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Remote 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Dynamics (kinetic energy) - warning
MPL 20x8x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 30.06 km/h
(8.35 m/s)
0.25 J
30 mm 51.55 km/h
(14.32 m/s)
0.74 J
50 mm 66.55 km/h
(18.49 m/s)
1.23 J
100 mm 94.11 km/h
(26.14 m/s)
2.46 J

Table 9: Anti-corrosion coating durability
MPL 20x8x6 / 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: Electrical data (Pc)
MPL 20x8x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 558 Mx 65.6 µWb
Pc Coefficient 0.52 Low (Flat)

Table 11: Physics of underwater searching
MPL 20x8x6 / N38

Environment Effective steel pull Effect
Air (land) 6.27 kg Standard
Water (riverbed) 7.18 kg
(+0.91 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!
1. Sliding resistance

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

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Temperature resistance

*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) = 0.52

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
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: 020134-2026
Magnet Unit Converter
Pulling force

Magnetic Induction

Other products

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 20x8x6 mm and a weight of 7.2 g, guarantees the highest quality connection. As a block magnet with high power (approx. 6.27 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 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. To separate the MPL 20x8x6 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 6.27 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
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).
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (20x8 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), 8 mm (width), and 6 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 6.27 kg (force ~61.50 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Apart from their strong magnetic energy, neodymium magnets have these key benefits:
  • They do not lose power, even after around 10 years – the reduction in strength is only ~1% (according to tests),
  • They are resistant to demagnetization induced by external magnetic fields,
  • In other words, due to the glossy finish of silver, the element looks attractive,
  • The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of custom machining and optimizing to concrete requirements,
  • Fundamental importance in innovative solutions – they are used in computer drives, electric motors, precision medical tools, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in miniature devices

Weaknesses

Problematic aspects of neodymium magnets and proposals for their use:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • NdFeB 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We recommend casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these products can be problematic in diagnostics 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

Maximum holding power of the magnet – what affects it?

Information about lifting capacity was determined for ideal contact conditions, taking into account:
  • with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
  • with a thickness no less than 10 mm
  • characterized by even structure
  • without any air gap between the magnet and steel
  • under perpendicular force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Effective lifting capacity is affected by working environment parameters, including (from priority):
  • Distance – the presence of any layer (rust, tape, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Plate thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be wasted into the air.
  • Plate material – mild steel gives the best results. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
GPS and phone interference

Navigation devices and mobile phones are extremely sensitive to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Allergic reactions

Studies show that the nickel plating (the usual finish) is a strong allergen. If your skin reacts to metals, avoid touching magnets with bare hands or choose coated magnets.

Pinching danger

Big blocks can smash fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Fire warning

Dust generated during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

No play value

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from kids and pets.

Shattering risk

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Protect data

Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Do not underestimate power

Handle magnets with awareness. Their huge power can shock even experienced users. Be vigilant and do not underestimate their force.

Power loss in heat

Standard neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Pacemakers

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

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