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MPL 20x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020129

GTIN/EAN: 5906301811350

5.00

length

20 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

60 g

Magnetization Direction

↑ axial

Load capacity

15.40 kg / 151.12 N

Magnetic Induction

540.22 mT / 5402 Gs

Coating

[NiCuNi] Nickel

33.21 with VAT / pcs + price for transport

27.00 ZŁ net + 23% VAT / pcs

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Technical parameters - MPL 20x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 20x20x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020129
GTIN/EAN 5906301811350
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 20 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 60 g
Magnetization Direction ↑ axial
Load capacity ~ ? 15.40 kg / 151.12 N
Magnetic Induction ~ ? 540.22 mT / 5402 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x20x20 / 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 simulation of the assembly - report

These data are the result of a physical calculation. Values are based on models for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these calculations as a supplementary guide for designers.

Table 1: Static pull force (pull vs gap) - power drop
MPL 20x20x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 5400 Gs
540.0 mT
15.40 kg / 15400.0 g
151.1 N
critical level
1 mm 4910 Gs
491.0 mT
12.73 kg / 12732.2 g
124.9 N
critical level
2 mm 4423 Gs
442.3 mT
10.33 kg / 10328.3 g
101.3 N
critical level
3 mm 3955 Gs
395.5 mT
8.26 kg / 8258.3 g
81.0 N
strong
5 mm 3114 Gs
311.4 mT
5.12 kg / 5120.3 g
50.2 N
strong
10 mm 1671 Gs
167.1 mT
1.48 kg / 1475.0 g
14.5 N
weak grip
15 mm 936 Gs
93.6 mT
0.46 kg / 463.0 g
4.5 N
weak grip
20 mm 562 Gs
56.2 mT
0.17 kg / 167.1 g
1.6 N
weak grip
30 mm 244 Gs
24.4 mT
0.03 kg / 31.3 g
0.3 N
weak grip
50 mm 73 Gs
7.3 mT
0.00 kg / 2.8 g
0.0 N
weak grip

Table 2: Vertical hold (vertical surface)
MPL 20x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 3.08 kg / 3080.0 g
30.2 N
1 mm Stal (~0.2) 2.55 kg / 2546.0 g
25.0 N
2 mm Stal (~0.2) 2.07 kg / 2066.0 g
20.3 N
3 mm Stal (~0.2) 1.65 kg / 1652.0 g
16.2 N
5 mm Stal (~0.2) 1.02 kg / 1024.0 g
10.0 N
10 mm Stal (~0.2) 0.30 kg / 296.0 g
2.9 N
15 mm Stal (~0.2) 0.09 kg / 92.0 g
0.9 N
20 mm Stal (~0.2) 0.03 kg / 34.0 g
0.3 N
30 mm Stal (~0.2) 0.01 kg / 6.0 g
0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 20x20x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.62 kg / 4620.0 g
45.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.08 kg / 3080.0 g
30.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.54 kg / 1540.0 g
15.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.70 kg / 7700.0 g
75.5 N

Table 4: Steel thickness (saturation) - power losses
MPL 20x20x20 / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
5%
0.77 kg / 770.0 g
7.6 N
1 mm
13%
1.93 kg / 1925.0 g
18.9 N
2 mm
25%
3.85 kg / 3850.0 g
37.8 N
5 mm
63%
9.63 kg / 9625.0 g
94.4 N
10 mm
100%
15.40 kg / 15400.0 g
151.1 N

Table 5: Thermal stability (material behavior) - resistance threshold
MPL 20x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 15.40 kg / 15400.0 g
151.1 N
OK
40 °C -2.2% 15.06 kg / 15061.2 g
147.8 N
OK
60 °C -4.4% 14.72 kg / 14722.4 g
144.4 N
OK
80 °C -6.6% 14.38 kg / 14383.6 g
141.1 N
100 °C -28.8% 10.96 kg / 10964.8 g
107.6 N

Table 6: Two magnets (attraction) - field collision
MPL 20x20x20 / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 71.92 kg / 71917 g
705.5 N
5 962 Gs
N/A
1 mm 65.60 kg / 65602 g
643.6 N
10 316 Gs
59.04 kg / 59042 g
579.2 N
~0 Gs
2 mm 59.46 kg / 59458 g
583.3 N
9 821 Gs
53.51 kg / 53513 g
525.0 N
~0 Gs
3 mm 53.66 kg / 53658 g
526.4 N
9 329 Gs
48.29 kg / 48293 g
473.8 N
~0 Gs
5 mm 43.20 kg / 43199 g
423.8 N
8 371 Gs
38.88 kg / 38879 g
381.4 N
~0 Gs
10 mm 23.91 kg / 23912 g
234.6 N
6 228 Gs
21.52 kg / 21520 g
211.1 N
~0 Gs
20 mm 6.89 kg / 6888 g
67.6 N
3 343 Gs
6.20 kg / 6199 g
60.8 N
~0 Gs
50 mm 0.32 kg / 320 g
3.1 N
721 Gs
0.29 kg / 288 g
2.8 N
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MPL 20x20x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.0 cm
Hearing aid 10 Gs (1.0 mT) 11.0 cm
Mechanical watch 20 Gs (2.0 mT) 8.5 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm

Table 8: Collisions (kinetic energy) - collision effects
MPL 20x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.10 km/h
(4.75 m/s)
0.68 J
30 mm 28.02 km/h
(7.78 m/s)
1.82 J
50 mm 36.13 km/h
(10.04 m/s)
3.02 J
100 mm 51.09 km/h
(14.19 m/s)
6.04 J

Table 9: Coating parameters (durability)
MPL 20x20x20 / 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 20x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 017 Mx 220.2 µWb
Pc Coefficient 0.84 High (Stable)

Table 11: Hydrostatics and buoyancy
MPL 20x20x20 / N38

Environment Effective steel pull Effect
Air (land) 15.40 kg Standard
Water (riverbed) 17.63 kg
(+2.23 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. Vertical hold

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

2. Plate thickness effect

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

3. Thermal stability

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.84

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
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%
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: 020129-2025
Magnet Unit Converter
Force (pull)

Magnetic Induction

Other proposals

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 20x20x20 mm and a weight of 60 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 15.40 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding 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 20x20x20 / 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. 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. 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. 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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 20x20x20 mm, which, at a weight of 60 g, makes it an element with impressive energy density. The key parameter here is the holding force amounting to approximately 15.40 kg (force ~151.12 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • Their strength is durable, and after around ten years it decreases only by ~1% (according to research),
  • They have excellent resistance to magnetic field loss as a result of opposing magnetic fields,
  • In other words, due to the aesthetic surface of gold, the element gains visual value,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which increases force concentration,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in forming and the capacity to customize to individual projects,
  • Universal use in future technologies – they are commonly used in mass storage devices, electromotive mechanisms, diagnostic systems, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions

Limitations

Drawbacks and weaknesses of neodymium magnets: application proposals
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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 start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of producing nuts in the magnet and complicated shapes - recommended is cover - magnet mounting.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small elements of these products are able to be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding forcewhat contributes to it?

The specified lifting capacity represents the limit force, recorded under optimal environment, specifically:
  • with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
  • with a cross-section of at least 10 mm
  • with an ideally smooth touching surface
  • under conditions of ideal adhesion (surface-to-surface)
  • during detachment in a direction perpendicular to the mounting surface
  • in neutral thermal conditions

Determinants of lifting force in real conditions

It is worth knowing that the working load may be lower influenced by elements below, starting with the most relevant:
  • Distance – existence of any layer (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be lost into the air.
  • Steel type – mild steel gives the best results. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate decreases the holding force.

Safety rules for work with neodymium magnets
Choking Hazard

Product intended for adults. Small elements can be swallowed, leading to intestinal necrosis. Store away from children and animals.

ICD Warning

People with a ICD should keep an safe separation from magnets. The magnetic field can stop the operation of the implant.

Eye protection

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets will cause them breaking into shards.

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction occurs, cease working with magnets and use protective gear.

Heat warning

Avoid heat. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Dust is flammable

Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Respect the power

Be careful. Neodymium magnets act from a long distance and snap with huge force, often quicker than you can move away.

Physical harm

Protect your hands. Two large magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!

Cards and drives

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

GPS and phone interference

Be aware: neodymium magnets generate a field that disrupts precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Caution! 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