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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

bulk discounts:

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Product card - 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

Physical simulation of the magnet - data

The following information are the result of a engineering simulation. Results were calculated on algorithms for the material Nd2Fe14B. Real-world parameters may differ. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
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 pounds
6270.0 g / 61.5 N
medium risk
1 mm 3505 Gs
350.5 mT
4.29 kg / 9.47 pounds
4293.5 g / 42.1 N
medium risk
2 mm 2814 Gs
281.4 mT
2.77 kg / 6.10 pounds
2766.9 g / 27.1 N
medium risk
3 mm 2235 Gs
223.5 mT
1.75 kg / 3.85 pounds
1745.9 g / 17.1 N
safe
5 mm 1425 Gs
142.5 mT
0.71 kg / 1.56 pounds
709.0 g / 7.0 N
safe
10 mm 540 Gs
54.0 mT
0.10 kg / 0.22 pounds
101.9 g / 1.0 N
safe
15 mm 248 Gs
24.8 mT
0.02 kg / 0.05 pounds
21.5 g / 0.2 N
safe
20 mm 131 Gs
13.1 mT
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
safe
30 mm 48 Gs
4.8 mT
0.00 kg / 0.00 pounds
0.8 g / 0.0 N
safe
50 mm 12 Gs
1.2 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
safe

Table 2: Slippage capacity (vertical surface)
MPL 20x8x6 / N38

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

Table 3: Wall mounting (shearing) - vertical pull
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 pounds
1881.0 g / 18.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.25 kg / 2.76 pounds
1254.0 g / 12.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.63 kg / 1.38 pounds
627.0 g / 6.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.14 kg / 6.91 pounds
3135.0 g / 30.8 N

Table 4: Steel thickness (substrate influence) - 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 pounds
627.0 g / 6.2 N
1 mm
25%
1.57 kg / 3.46 pounds
1567.5 g / 15.4 N
2 mm
50%
3.14 kg / 6.91 pounds
3135.0 g / 30.8 N
3 mm
75%
4.70 kg / 10.37 pounds
4702.5 g / 46.1 N
5 mm
100%
6.27 kg / 13.82 pounds
6270.0 g / 61.5 N
10 mm
100%
6.27 kg / 13.82 pounds
6270.0 g / 61.5 N
11 mm
100%
6.27 kg / 13.82 pounds
6270.0 g / 61.5 N
12 mm
100%
6.27 kg / 13.82 pounds
6270.0 g / 61.5 N

Table 5: Working in heat (material behavior) - power drop
MPL 20x8x6 / N38

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

Table 6: Two magnets (repulsion) - field collision
MPL 20x8x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.70 kg / 39.02 pounds
5 386 Gs
2.66 kg / 5.85 pounds
2655 g / 26.0 N
N/A
1 mm 14.82 kg / 32.66 pounds
7 751 Gs
2.22 kg / 4.90 pounds
2222 g / 21.8 N
13.33 kg / 29.40 pounds
~0 Gs
2 mm 12.12 kg / 26.72 pounds
7 011 Gs
1.82 kg / 4.01 pounds
1818 g / 17.8 N
10.91 kg / 24.05 pounds
~0 Gs
3 mm 9.78 kg / 21.55 pounds
6 296 Gs
1.47 kg / 3.23 pounds
1466 g / 14.4 N
8.80 kg / 19.40 pounds
~0 Gs
5 mm 6.21 kg / 13.69 pounds
5 018 Gs
0.93 kg / 2.05 pounds
932 g / 9.1 N
5.59 kg / 12.32 pounds
~0 Gs
10 mm 2.00 kg / 4.41 pounds
2 849 Gs
0.30 kg / 0.66 pounds
300 g / 2.9 N
1.80 kg / 3.97 pounds
~0 Gs
20 mm 0.29 kg / 0.63 pounds
1 080 Gs
0.04 kg / 0.10 pounds
43 g / 0.4 N
0.26 kg / 0.57 pounds
~0 Gs
50 mm 0.01 kg / 0.01 pounds
153 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.01 pounds
97 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
65 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
45 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
33 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
25 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~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
Mobile device 40 Gs (4.0 mT) 3.5 cm
Car key 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: Collisions (cracking risk) - collision effects
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: Surface protection spec
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 (Flux)
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

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

2. Steel saturation

*Thin steel (e.g. computer case) severely limits the holding force.

3. Power loss vs temp

*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) = 0.52

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.

Engineering data and GPSR
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: 020134-2026
Magnet Unit Converter
Force (pull)

Field Strength

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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 20x8x6 mm and a weight of 7.2 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 6.27 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.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. 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.
Plate magnets MPL 20x8x6 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners 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. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 20x8x6 / N38 model is magnetized through the thickness (dimension 6 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 (20x8 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 20x8x6 mm, which, at a weight of 7.2 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 6.27 kg (force ~61.50 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Advantages

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • They retain their magnetic properties even under strong external field,
  • A magnet with a shiny silver surface looks better,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to freedom in designing and the ability to customize to unusual requirements,
  • Versatile presence in high-tech industry – they are used in computer drives, motor assemblies, medical devices, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in small systems

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend cover - magnetic mount, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small components of these products are able to 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

Lifting parameters

Best holding force of the magnet in ideal parameterswhat affects it?

The specified lifting capacity represents the limit force, measured under ideal test conditions, namely:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with an ground contact surface
  • with direct contact (no paint)
  • during pulling in a direction perpendicular to the plane
  • at room temperature

Key elements affecting lifting force

During everyday use, the real power is determined by many variables, presented from crucial:
  • Clearance – the presence of foreign body (rust, tape, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under shearing force the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Dust is flammable

Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Threat to electronics

Powerful magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Powerful field

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

Skin irritation risks

Some people have a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact may cause dermatitis. We strongly advise wear protective gloves.

Choking Hazard

Product intended for adults. Tiny parts pose a choking risk, leading to severe trauma. Store out of reach of kids and pets.

Life threat

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

Protective goggles

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Impact on smartphones

An intense magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Keep magnets close to a device to prevent breaking the sensors.

Crushing risk

Mind your fingers. Two powerful magnets will snap together immediately with a force of massive weight, destroying anything in their path. Be careful!

Power loss in heat

Do not overheat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Attention! Want to know more? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98