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MPL 20x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020128

GTIN/EAN: 5906301811343

5.00

length

20 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

7.5 g

Magnetization Direction

↑ axial

Load capacity

6.15 kg / 60.31 N

Magnetic Induction

349.47 mT / 3495 Gs

Coating

[NiCuNi] Nickel

4.54 with VAT / pcs + price for transport

3.69 ZŁ net + 23% VAT / pcs

bulk discounts:

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Physical properties - MPL 20x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 20x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020128
GTIN/EAN 5906301811343
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 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 7.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.15 kg / 60.31 N
Magnetic Induction ~ ? 349.47 mT / 3495 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x10x5 / 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 analysis of the assembly - report

The following data represent the direct effect of a mathematical simulation. Results are based on algorithms for the material Nd2Fe14B. Actual performance may differ from theoretical values. Use these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs gap) - interaction chart
MPL 20x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3493 Gs
349.3 mT
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
warning
1 mm 3035 Gs
303.5 mT
4.64 kg / 10.23 lbs
4641.8 g / 45.5 N
warning
2 mm 2558 Gs
255.8 mT
3.30 kg / 7.27 lbs
3298.0 g / 32.4 N
warning
3 mm 2120 Gs
212.0 mT
2.26 kg / 4.99 lbs
2264.8 g / 22.2 N
warning
5 mm 1433 Gs
143.3 mT
1.03 kg / 2.28 lbs
1034.5 g / 10.1 N
low risk
10 mm 574 Gs
57.4 mT
0.17 kg / 0.37 lbs
166.1 g / 1.6 N
low risk
15 mm 267 Gs
26.7 mT
0.04 kg / 0.08 lbs
35.9 g / 0.4 N
low risk
20 mm 141 Gs
14.1 mT
0.01 kg / 0.02 lbs
10.1 g / 0.1 N
low risk
30 mm 52 Gs
5.2 mT
0.00 kg / 0.00 lbs
1.4 g / 0.0 N
low risk
50 mm 13 Gs
1.3 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
low risk

Table 2: Shear force (vertical surface)
MPL 20x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.23 kg / 2.71 lbs
1230.0 g / 12.1 N
1 mm Stal (~0.2) 0.93 kg / 2.05 lbs
928.0 g / 9.1 N
2 mm Stal (~0.2) 0.66 kg / 1.46 lbs
660.0 g / 6.5 N
3 mm Stal (~0.2) 0.45 kg / 1.00 lbs
452.0 g / 4.4 N
5 mm Stal (~0.2) 0.21 kg / 0.45 lbs
206.0 g / 2.0 N
10 mm Stal (~0.2) 0.03 kg / 0.07 lbs
34.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 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 (shearing) - behavior on slippery surfaces
MPL 20x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.85 kg / 4.07 lbs
1845.0 g / 18.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.23 kg / 2.71 lbs
1230.0 g / 12.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.62 kg / 1.36 lbs
615.0 g / 6.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.08 kg / 6.78 lbs
3075.0 g / 30.2 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 20x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.62 kg / 1.36 lbs
615.0 g / 6.0 N
1 mm
25%
1.54 kg / 3.39 lbs
1537.5 g / 15.1 N
2 mm
50%
3.08 kg / 6.78 lbs
3075.0 g / 30.2 N
3 mm
75%
4.61 kg / 10.17 lbs
4612.5 g / 45.2 N
5 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
10 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
11 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
12 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N

Table 5: Working in heat (material behavior) - thermal limit
MPL 20x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
OK
40 °C -2.2% 6.01 kg / 13.26 lbs
6014.7 g / 59.0 N
OK
60 °C -4.4% 5.88 kg / 12.96 lbs
5879.4 g / 57.7 N
80 °C -6.6% 5.74 kg / 12.66 lbs
5744.1 g / 56.3 N
100 °C -28.8% 4.38 kg / 9.65 lbs
4378.8 g / 43.0 N

Table 6: Two magnets (attraction) - field range
MPL 20x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 15.04 kg / 33.17 lbs
4 923 Gs
2.26 kg / 4.98 lbs
2257 g / 22.1 N
N/A
1 mm 13.20 kg / 29.11 lbs
6 544 Gs
1.98 kg / 4.37 lbs
1980 g / 19.4 N
11.88 kg / 26.19 lbs
~0 Gs
2 mm 11.36 kg / 25.03 lbs
6 069 Gs
1.70 kg / 3.76 lbs
1703 g / 16.7 N
10.22 kg / 22.53 lbs
~0 Gs
3 mm 9.63 kg / 21.22 lbs
5 588 Gs
1.44 kg / 3.18 lbs
1444 g / 14.2 N
8.66 kg / 19.10 lbs
~0 Gs
5 mm 6.71 kg / 14.78 lbs
4 664 Gs
1.01 kg / 2.22 lbs
1006 g / 9.9 N
6.03 kg / 13.30 lbs
~0 Gs
10 mm 2.53 kg / 5.58 lbs
2 865 Gs
0.38 kg / 0.84 lbs
380 g / 3.7 N
2.28 kg / 5.02 lbs
~0 Gs
20 mm 0.41 kg / 0.90 lbs
1 148 Gs
0.06 kg / 0.13 lbs
61 g / 0.6 N
0.37 kg / 0.81 lbs
~0 Gs
50 mm 0.01 kg / 0.02 lbs
165 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
104 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
69 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
48 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
35 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
26 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 20x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.5 cm
Hearing aid 10 Gs (1.0 mT) 6.0 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) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - collision effects
MPL 20x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.36 km/h
(8.16 m/s)
0.25 J
30 mm 50.03 km/h
(13.90 m/s)
0.72 J
50 mm 64.58 km/h
(17.94 m/s)
1.21 J
100 mm 91.32 km/h
(25.37 m/s)
2.41 J

Table 9: Coating parameters (durability)
MPL 20x10x5 / 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 20x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 031 Mx 70.3 µWb
Pc Coefficient 0.42 Low (Flat)

Table 11: Submerged application
MPL 20x10x5 / N38

Environment Effective steel pull Effect
Air (land) 6.15 kg Standard
Water (riverbed) 7.04 kg
(+0.89 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Note: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Thermal stability

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.42

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.

Technical specification and ecology
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%
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: 020128-2026
Measurement Calculator
Pulling force

Magnetic Field

See also deals

This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 20x10x5 mm and a weight of 7.5 g, guarantees premium class connection. As a magnetic bar with high power (approx. 6.15 kg), this product is available off-the-shelf from our warehouse in Poland. 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. To separate the MPL 20x10x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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. 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.
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. Remember to roughen and wash 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.
This model is characterized by dimensions 20x10x5 mm, which, at a weight of 7.5 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 6.15 kg (force ~60.31 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of Nd2Fe14B magnets.

Advantages

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • Their magnetic field is maintained, and after around 10 years it drops only by ~1% (according to research),
  • Neodymium magnets are characterized by exceptionally resistant to magnetic field loss caused by external magnetic fields,
  • By applying a shiny layer of nickel, the element gains an modern look,
  • They are known for high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
  • Possibility of precise modeling as well as adapting to individual applications,
  • Key role in innovative solutions – they serve a role in data components, motor assemblies, precision medical tools, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices

Weaknesses

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets lose their power 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 stability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest cover - magnetic mount, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these devices are able to complicate diagnosis medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding forcewhat it depends on?

Magnet power was defined for optimal configuration, assuming:
  • with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • characterized by even structure
  • with direct contact (without coatings)
  • during pulling in a direction vertical to the plane
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Bear in mind that the working load will differ subject to elements below, in order of importance:
  • Gap (betwixt the magnet and the plate), since even a very small distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Plate material – low-carbon steel gives the best results. Alloy steels reduce magnetic properties and holding force.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Crushing risk

Watch your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Do not give to children

Absolutely store magnets away from children. Ingestion danger is high, and the effects of magnets clamping inside the body are tragic.

Allergy Warning

Medical facts indicate that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact and select encased magnets.

Impact on smartphones

Note: rare earth magnets produce a field that interferes with precision electronics. Maintain a safe distance from your phone, device, and navigation systems.

Beware of splinters

Beware of splinters. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.

Safe distance

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

Operating temperature

Watch the temperature. Heating the magnet to high heat will permanently weaken its properties and pulling force.

Flammability

Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Medical implants

Patients with a ICD must maintain an large gap from magnets. The magnetic field can disrupt the operation of the implant.

Respect the power

Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Security! Details about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98