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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 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

Technical analysis of the magnet - technical parameters

The following information constitute the outcome of a engineering analysis. Values are based on algorithms for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
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
warning
5 mm 3114 Gs
311.4 mT
5.12 kg / 5120.3 g
50.2 N
warning
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: Shear 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: Wall mounting (shearing) - 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) - sheet metal selection
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 (stability) - thermal limit
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: Magnet-Magnet interaction (repulsion) - 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) - precautionary measures
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: Impact energy (kinetic energy) - 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 (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: Submerged application
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

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

3. Temperature resistance

*For N38 grade, the critical limit 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
Material specification
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: 020129-2025
Quick Unit Converter
Force (pull)

Magnetic Field

See also proposals

Model MPL 20x20x20 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. 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.
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 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. 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. Thanks to the flat surface and high force (approx. 15.40 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 20x20x20 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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 high energy density. It is a magnetic block with dimensions 20x20x20 mm and a self-weight of 60 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of neodymium magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose power, even during nearly ten years – the reduction in strength is only ~1% (based on measurements),
  • They retain their magnetic properties even under strong external field,
  • In other words, due to the glossy finish of gold, the element looks attractive,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Due to the option of flexible molding and adaptation to individualized projects, NdFeB magnets can be manufactured in a wide range of shapes and sizes, which makes them more universal,
  • Significant place in high-tech industry – they are utilized in hard drives, electromotive mechanisms, diagnostic systems, and industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Cons of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's 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
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating threads in the magnet and complex forms - preferred is casing - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Magnetic strength at its maximum – what affects it?

The specified lifting capacity represents the maximum value, measured under laboratory conditions, specifically:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • whose thickness equals approx. 10 mm
  • characterized by smoothness
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction perpendicular to the mounting surface
  • in stable room temperature

Magnet lifting force in use – key factors

Effective lifting capacity impacted by working environment parameters, mainly (from most important):
  • Gap between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Operating temperature

Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Sensitization to coating

Studies show that nickel (the usual finish) is a strong allergen. For allergy sufferers, prevent direct skin contact and select versions in plastic housing.

Powerful field

Exercise caution. Rare earth magnets act from a distance and snap with massive power, often faster than you can react.

Mechanical processing

Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.

GPS and phone interference

Navigation devices and mobile phones are extremely susceptible to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

No play value

Product intended for adults. Small elements can be swallowed, leading to intestinal necrosis. Keep out of reach of kids and pets.

Danger to pacemakers

Warning for patients: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.

Physical harm

Danger of trauma: The pulling power is so great that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Beware of splinters

Neodymium magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them shattering into small pieces.

Electronic devices

Very strong magnetic fields can destroy records on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Warning! Learn more about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98