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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

bulk discounts:

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29.22 ZŁ
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Technical of the product - 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

Physical modeling of the assembly - data

Presented values represent the outcome of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Real-world performance may differ. Please consider these calculations as a supplementary guide during assembly planning.

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

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5400 Gs
540.0 mT
15.40 kg / 33.95 LBS
15400.0 g / 151.1 N
critical level
1 mm 4910 Gs
491.0 mT
12.73 kg / 28.07 LBS
12732.2 g / 124.9 N
critical level
2 mm 4423 Gs
442.3 mT
10.33 kg / 22.77 LBS
10328.3 g / 101.3 N
critical level
3 mm 3955 Gs
395.5 mT
8.26 kg / 18.21 LBS
8258.3 g / 81.0 N
warning
5 mm 3114 Gs
311.4 mT
5.12 kg / 11.29 LBS
5120.3 g / 50.2 N
warning
10 mm 1671 Gs
167.1 mT
1.48 kg / 3.25 LBS
1475.0 g / 14.5 N
low risk
15 mm 936 Gs
93.6 mT
0.46 kg / 1.02 LBS
463.0 g / 4.5 N
low risk
20 mm 562 Gs
56.2 mT
0.17 kg / 0.37 LBS
167.1 g / 1.6 N
low risk
30 mm 244 Gs
24.4 mT
0.03 kg / 0.07 LBS
31.3 g / 0.3 N
low risk
50 mm 73 Gs
7.3 mT
0.00 kg / 0.01 LBS
2.8 g / 0.0 N
low risk

Table 2: Slippage capacity (wall)
MPL 20x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.08 kg / 6.79 LBS
3080.0 g / 30.2 N
1 mm Stal (~0.2) 2.55 kg / 5.61 LBS
2546.0 g / 25.0 N
2 mm Stal (~0.2) 2.07 kg / 4.55 LBS
2066.0 g / 20.3 N
3 mm Stal (~0.2) 1.65 kg / 3.64 LBS
1652.0 g / 16.2 N
5 mm Stal (~0.2) 1.02 kg / 2.26 LBS
1024.0 g / 10.0 N
10 mm Stal (~0.2) 0.30 kg / 0.65 LBS
296.0 g / 2.9 N
15 mm Stal (~0.2) 0.09 kg / 0.20 LBS
92.0 g / 0.9 N
20 mm Stal (~0.2) 0.03 kg / 0.07 LBS
34.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
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/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.62 kg / 10.19 LBS
4620.0 g / 45.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.08 kg / 6.79 LBS
3080.0 g / 30.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.54 kg / 3.40 LBS
1540.0 g / 15.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.70 kg / 16.98 LBS
7700.0 g / 75.5 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 20x20x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
1 mm
13%
1.93 kg / 4.24 LBS
1925.0 g / 18.9 N
2 mm
25%
3.85 kg / 8.49 LBS
3850.0 g / 37.8 N
3 mm
38%
5.78 kg / 12.73 LBS
5775.0 g / 56.7 N
5 mm
63%
9.63 kg / 21.22 LBS
9625.0 g / 94.4 N
10 mm
100%
15.40 kg / 33.95 LBS
15400.0 g / 151.1 N
11 mm
100%
15.40 kg / 33.95 LBS
15400.0 g / 151.1 N
12 mm
100%
15.40 kg / 33.95 LBS
15400.0 g / 151.1 N

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

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 15.40 kg / 33.95 LBS
15400.0 g / 151.1 N
OK
40 °C -2.2% 15.06 kg / 33.20 LBS
15061.2 g / 147.8 N
OK
60 °C -4.4% 14.72 kg / 32.46 LBS
14722.4 g / 144.4 N
OK
80 °C -6.6% 14.38 kg / 31.71 LBS
14383.6 g / 141.1 N
100 °C -28.8% 10.96 kg / 24.17 LBS
10964.8 g / 107.6 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 20x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 71.92 kg / 158.55 LBS
5 962 Gs
10.79 kg / 23.78 LBS
10787 g / 105.8 N
N/A
1 mm 65.60 kg / 144.63 LBS
10 316 Gs
9.84 kg / 21.69 LBS
9840 g / 96.5 N
59.04 kg / 130.16 LBS
~0 Gs
2 mm 59.46 kg / 131.08 LBS
9 821 Gs
8.92 kg / 19.66 LBS
8919 g / 87.5 N
53.51 kg / 117.97 LBS
~0 Gs
3 mm 53.66 kg / 118.30 LBS
9 329 Gs
8.05 kg / 17.74 LBS
8049 g / 79.0 N
48.29 kg / 106.47 LBS
~0 Gs
5 mm 43.20 kg / 95.24 LBS
8 371 Gs
6.48 kg / 14.29 LBS
6480 g / 63.6 N
38.88 kg / 85.71 LBS
~0 Gs
10 mm 23.91 kg / 52.72 LBS
6 228 Gs
3.59 kg / 7.91 LBS
3587 g / 35.2 N
21.52 kg / 47.44 LBS
~0 Gs
20 mm 6.89 kg / 15.19 LBS
3 343 Gs
1.03 kg / 2.28 LBS
1033 g / 10.1 N
6.20 kg / 13.67 LBS
~0 Gs
50 mm 0.32 kg / 0.71 LBS
721 Gs
0.05 kg / 0.11 LBS
48 g / 0.5 N
0.29 kg / 0.64 LBS
~0 Gs
60 mm 0.15 kg / 0.32 LBS
487 Gs
0.02 kg / 0.05 LBS
22 g / 0.2 N
0.13 kg / 0.29 LBS
~0 Gs
70 mm 0.07 kg / 0.16 LBS
344 Gs
0.01 kg / 0.02 LBS
11 g / 0.1 N
0.07 kg / 0.14 LBS
~0 Gs
80 mm 0.04 kg / 0.09 LBS
251 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
0.04 kg / 0.08 LBS
~0 Gs
90 mm 0.02 kg / 0.05 LBS
189 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
0.02 kg / 0.04 LBS
~0 Gs
100 mm 0.01 kg / 0.03 LBS
146 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
0.01 kg / 0.03 LBS
~0 Gs

Table 7: Protective zones (implants) - 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
Phone / Smartphone 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 (cracking risk) - warning
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: Construction data (Pc)
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Power loss vs temp

*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) = 0.84

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
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%
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: 020129-2025
Measurement Calculator
Force (pull)

Field Strength

See also deals

This product is a very powerful 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. This magnetic block with a force of 151.12 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 strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 20x20x20 / 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 generators and material handling systems. They work great as invisible mounts 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. 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).
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (20x20 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 20x20x20 mm, which, at a weight of 60 g, makes it an element with high 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 grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of rare earth magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • Magnets effectively protect themselves against loss of magnetization caused by external fields,
  • Thanks to the shimmering finish, the surface of nickel, gold, or silver-plated gives an elegant appearance,
  • Magnets exhibit huge magnetic induction on the surface,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in designing and the ability to modify to complex applications,
  • Fundamental importance in high-tech industry – they find application in HDD drives, motor assemblies, diagnostic systems, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in miniature devices

Disadvantages

What to avoid - cons of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose their force 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
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complex forms in magnets, we recommend using cover - magnetic mount.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Additionally, small elements of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Maximum magnetic pulling forcewhat affects it?

Information about lifting capacity is the result of a measurement for optimal configuration, including:
  • with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
  • whose thickness equals approx. 10 mm
  • with an ideally smooth touching surface
  • without the slightest clearance between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at standard ambient temperature

What influences lifting capacity in practice

Bear in mind that the application force may be lower subject to elements below, in order of importance:
  • Distance – existence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.

Safe handling of neodymium magnets
Avoid contact if allergic

Some people suffer from a hypersensitivity to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact can result in skin redness. We recommend wear safety gloves.

GPS Danger

An intense magnetic field negatively affects the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets close to a device to prevent damaging the sensors.

Caution required

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Fire warning

Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

No play value

Neodymium magnets are not toys. Eating a few magnets can lead to them connecting inside the digestive tract, which constitutes a critical condition and necessitates urgent medical intervention.

Permanent damage

Avoid heat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Eye protection

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Protect data

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

Finger safety

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

Health Danger

Individuals with a heart stimulator should keep an large gap from magnets. The magnetic field can stop the functioning of the implant.

Warning! More info 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