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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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Detailed specification - 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 - data

These values are the outcome of a mathematical analysis. Results rely on algorithms for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Treat these calculations as a supplementary guide for designers.

Table 1: Static pull force (force 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: Vertical assembly (shearing) - 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 resistance (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

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
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 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: Protective zones (electronics) - precautionary measures
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
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: 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)

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: Underwater work (magnet fishing)
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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

*Note: On a vertical wall, the magnet retains just ~20% of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Thermal stability

*For N38 grade, the safety 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.

Technical and environmental data
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
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Magnet pull force

Magnetic Field

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Model MPL 20x8x6 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 61.50 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 6.27 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of generators and material handling systems. They work great as invisible mounts 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.
For mounting flat magnets MPL 20x8x6 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 20x8x6 mm, which, at a weight of 7.2 g, makes it an element with high energy density. 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 protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of neodymium magnets.

Advantages

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • Their magnetic field remains stable, and after approximately ten years it decreases only by ~1% (according to research),
  • They retain their magnetic properties even under external field action,
  • In other words, due to the shiny finish of silver, the element becomes visually attractive,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to freedom in constructing and the capacity to customize to complex applications,
  • Significant place in modern technologies – they are utilized in hard drives, electromotive mechanisms, diagnostic systems, also industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures 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 secure oxidation and corrosion.
  • Limited possibility of creating threads in the magnet and complicated shapes - recommended is cover - mounting mechanism.
  • Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical when they are in the body.
  • Due to expensive raw materials, their price is higher than average,

Holding force characteristics

Maximum magnetic pulling forcewhat it depends on?

The specified lifting capacity concerns the limit force, measured under laboratory conditions, meaning:
  • on a block made of mild steel, effectively closing the magnetic flux
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an ground contact surface
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

In practice, the actual lifting capacity is determined by a number of factors, ranked from most significant:
  • Clearance – existence of any layer (rust, tape, gap) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Plate thickness – too thin plate causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet and the plate reduces the load capacity.

Safe handling of NdFeB magnets
Shattering risk

Watch out for shards. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Fire risk

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Conscious usage

Before use, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Safe distance

Very strong magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Physical harm

Risk of injury: The pulling power is so immense that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.

Nickel allergy

Certain individuals experience a sensitization to nickel, which is the common plating for NdFeB magnets. Prolonged contact may cause an allergic reaction. We strongly advise use protective gloves.

Swallowing risk

Absolutely keep magnets away from children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are fatal.

Heat warning

Control the heat. Heating the magnet to high heat will destroy its properties and strength.

Life threat

Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Phone sensors

Note: neodymium magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, device, and GPS.

Safety First! Looking for details? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98