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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

technical parameters »

5.17 ZŁ with VAT / pcs + price for transport

4.20 ZŁ net + 23% VAT / pcs

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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

Technical modeling of the magnet - report

Presented information are the outcome of a engineering simulation. Values were calculated on algorithms for the material Nd2Fe14B. Real-world parameters may differ. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs distance) - 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
 warning
1 mm 3505 Gs
350.5 mT
 4.29 kg / 9.47 LBS
4293.5 g / 42.1 N
 warning
2 mm 2814 Gs
281.4 mT
 2.77 kg / 6.10 LBS
2766.9 g / 27.1 N
 warning
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
Magnetic force decreases sharply with every subsequent millimeter of spacing. Remember that even a very thin break (e.g., contamination, paint, dust) strongly reduces the pull force. Magnetic products hold strongest in perfect adhesion; gap weakens the power. Observe how quickly the load capacity plummet, when the magnet does not adhere flatly to the metal substrate. When planning the assembly, avoid redundant distances.

Table 2: Vertical 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 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
The following data presents the estimated holding capacity required to start the downward movement of the magnet vertically against a vertical steel plate (assuming typical friction). This value varies with the distance between the magnet and the metal.

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
When hanging a element on a vertical plane (e.g., a board), it you can count on just approx. 1/5 of its nominal power. Gravity as well as a weak degree of grip influence the fact that products move down easier than they pull off. Want to create a wall mount? Remember that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the magnet will slip down under a significantly smaller cargo. Using a rubber coating can significantly increase the grip.

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 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
A thin sheet is not enough to take in the full magnetic flux, which weakens actual performance of the holder. Should you attach a powerful product to a thin surface, the flux will pass right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid piece of metal. The saturation phenomenon means that on delicate walls (e.g., appliance housings), the magnet works worse. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - 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
Ordinary NdFeB products irreversibly lose strength above the temperature limit. Avoid high temperatures – heat can permanently destroy this magnet. With every degree above norm, the magnet's force momentarily decreases. Avoid using this magnet in hot environments exceeding its safe range. Exceeding the critical threshold will lead to irreversible degradation of magnetism.
*Technical advisory: Thermal stability is determined by both grade, but also on the magnet's shape. Flat magnets (pancake types) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (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
Two magnets interact from a much further distance than a magnet and sheet setup. The connection of magnet-to-magnet produces a massive flux and a larger range of action. Planning to create a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Remember that when connecting a pair of magnets, the pinch force is massive. The repulsion force is a bit weaker than the connection force, but still impressive.
*Field value for N-N configuration drops to ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Note: Results refer to shear force of two same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - 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
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
Powerful magnet radiation poses a serious hazard to IT equipment as well as pacemakers. These neodymiums produce a flux that disrupts operation of sensitive medical devices. Remember: the unseen radiation acts through matter and glass. Special caution must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (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
Magnetic elements are prone to chipping – a violent impact against metal risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the magnet. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

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)
Total magnetic flux emitted by the magnet pole. Essential parameter when building generators as well as sensors. Pc value determines the working geometry.

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!
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds only ~20% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Power loss vs temp

*For N38 material, 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

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
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%
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
Magnet pull force
Magnetic Field
Type a value into any field, to see all other values change in real-time.

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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 premium class connection. As a magnetic bar with high power (approx. 6.27 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects 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. 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of wind generators and material handling systems. They work great as fasteners under tiles, wood, or glass. 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. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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.
The presented product is a neodymium magnet with precisely defined parameters: 20 mm (length), 8 mm (width), and 6 mm (thickness). It is a magnetic block with dimensions 20x8x6 mm and a self-weight of 7.2 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Strengths

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They have constant strength, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets are characterized by remarkably resistant to magnetic field loss caused by external field sources,
  • Thanks to the reflective finish, the plating of Ni-Cu-Ni, gold, or silver gives an aesthetic appearance,
  • Magnets possess extremely high magnetic induction on the working surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to versatility in shaping and the ability to customize to unusual requirements,
  • Huge importance in modern technologies – they serve a role in HDD drives, drive modules, diagnostic systems, and other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Cons of neodymium magnets and ways of using them
  • At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • 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.
  • Limited ability of creating threads in the magnet and complicated shapes - preferred is casing - mounting mechanism.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum magnetic pulling force – what affects it?

Holding force of 6.27 kg is a result of laboratory testing performed under specific, ideal conditions:
  • using a sheet made of high-permeability steel, acting as a circuit closing element
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with an polished contact surface
  • under conditions of no distance (metal-to-metal)
  • under vertical force direction (90-degree angle)
  • at temperature room level

Magnet lifting force in use – key factors

Bear in mind that the working load may be lower subject to elements below, in order of importance:
  • Distance – the presence of foreign body (paint, dirt, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Plate material – low-carbon steel attracts best. Alloy steels decrease magnetic permeability and holding force.
  • Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate lowers the lifting capacity.

H&S for magnets
Fragile material

NdFeB magnets are sintered ceramics, which means they are fragile like glass. Clashing of two magnets leads to them shattering into shards.

Finger safety

Big blocks can smash fingers instantly. Never place your hand between two attracting surfaces.

Dust explosion hazard

Drilling and cutting of NdFeB material carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Keep away from electronics

GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Heat warning

Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Conscious usage

Be careful. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can move away.

Medical implants

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Keep away from children

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

Nickel coating and allergies

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

Electronic devices

Do not bring magnets near a purse, computer, or screen. The magnetism can destroy these devices and wipe information from cards.

Attention! Learn more about hazards in the article: Magnet Safety Guide.