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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

technical specifications »

33.21 ZŁ with VAT / pcs + price for transport

27.00 ZŁ net + 23% VAT / pcs

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Technical data - 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 product - report

Presented data constitute the direct effect of a physical simulation. Values rely on models for the material Nd2Fe14B. Real-world performance may differ. Please consider these data as a reference point when designing systems.

Table 1: Static force (force vs gap) - characteristics
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
 crushing
1 mm 4910 Gs
491.0 mT
 12.73 kg / 28.07 lbs
12732.2 g / 124.9 N
 crushing
2 mm 4423 Gs
442.3 mT
 10.33 kg / 22.77 lbs
10328.3 g / 101.3 N
 crushing
3 mm 3955 Gs
395.5 mT
 8.26 kg / 18.21 lbs
8258.3 g / 81.0 N
 medium risk
5 mm 3114 Gs
311.4 mT
 5.12 kg / 11.29 lbs
5120.3 g / 50.2 N
 medium risk
10 mm 1671 Gs
167.1 mT
 1.48 kg / 3.25 lbs
1475.0 g / 14.5 N
 safe
15 mm 936 Gs
93.6 mT
 0.46 kg / 1.02 lbs
463.0 g / 4.5 N
 safe
20 mm 562 Gs
56.2 mT
 0.17 kg / 0.37 lbs
167.1 g / 1.6 N
 safe
30 mm 244 Gs
24.4 mT
 0.03 kg / 0.07 lbs
31.3 g / 0.3 N
 safe
50 mm 73 Gs
7.3 mT
 0.00 kg / 0.01 lbs
2.8 g / 0.0 N
 safe
Grip strength decreases significantly with every subsequent millimeter of gap. Note that even the smallest gap (e.g., contamination, varnish, dust) significantly diminishes the holding power. Neodymiums work strongest at the point of direct contact; distance drastically cuts the power. Analyze how quickly the load capacity fall, when the magnet does not touch flatly to the steel surface. When calculating the arrangement, discard redundant distances.

Table 2: Shear force (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
This section defines the estimated force required to cause the slippage of the magnet downwards on a upright steel plate (assuming standard friction). This parameter varies with the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
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
When hanging a magnet on a upright plane (e.g., a car body), it will only hold barely approx. 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip cause that magnets slide down easier than they pop off the substrate. Want to create a wall mount? Remember that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will slip down under a noticeably lighter cargo. Application of an anti-slip pad can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
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
A thin sheet cannot focus the entire magnetic field, which squanders power of the holder. Should you install a neodymium to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To utilize the maximum of this neodymium's potential, you require a sufficiently solid backing of steel. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We suggest choosing the steel thickness based on the following data.

Table 5: Thermal stability (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
Standard neodymium magnets change their properties power above the temperature limit. Watch out for overheating – high temperature can permanently damage this magnet. With increasing heat, the magnet's power briefly lowers. Avoid using this magnet near heat sources higher than its safe range. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MPL 20x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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
Two magnetic products attract each other from a much further distance than a magnet and sheet combination. Such a system of two magnets generates a stronger field and a larger range of action. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the impact force is huge. The levitation is slightly lower than the attraction, but still large.
*Field value in repulsion mode is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Attention: Results show friction force of two same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (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
Remote 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
Extremely neodym field poses a real danger to IT equipment and medical implants. These magnets produce a field that disrupts operation of digital equipment. Remember: the invisible magnetic field acts through matter and plastic. Special caution must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (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
Neodymium magnets are delicate – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Anti-corrosion coating 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Flux value emitted by the pole surface. Key data in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
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!
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Sliding resistance

*Caution: On a vertical wall, the magnet holds only a fraction of its perpendicular strength.

2. Efficiency vs thickness

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

3. Heat tolerance

*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

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 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%
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: 020129-2026
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Component MPL 20x20x20 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 151.12 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating protects 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. Watch your fingers! Magnets with a force of 15.40 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 20x20x20 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 15.40 kg), they are ideal as closers in furniture making and mounting elements in automation. 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).
Standardly, the MPL 20x20x20 / N38 model is magnetized through the thickness (dimension 20 mm), which means that the N and S poles are located on its largest, flat surfaces. 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.
The presented product is a neodymium magnet with precisely defined parameters: 20 mm (length), 20 mm (width), and 20 mm (thickness). The key parameter here is the holding force amounting to approximately 15.40 kg (force ~151.12 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of neodymium magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • Magnets very well protect themselves against demagnetization caused by external fields,
  • Thanks to the smooth finish, the layer of Ni-Cu-Ni, gold-plated, or silver-plated gives an clean appearance,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of accurate creating and adjusting to precise needs,
  • Versatile presence in modern industrial fields – they are commonly used in computer drives, electric drive systems, advanced medical instruments, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Weaknesses

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in producing nuts and complex shapes in magnets, we propose using cover - magnetic mount.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these devices can disrupt the diagnostic process medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Magnetic strength at its maximum – what contributes to it?

The lifting capacity listed is a theoretical maximum value conducted under the following configuration:
  • on a base made of structural steel, effectively closing the magnetic flux
  • with a cross-section of at least 10 mm
  • with a surface free of scratches
  • under conditions of no distance (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • at temperature room level

Lifting capacity in practice – influencing factors

During everyday use, the actual holding force depends on a number of factors, presented from the most important:
  • Distance (between the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick plate does not accept the full field, causing part of the flux to be wasted into the air.
  • Plate material – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate decreases the holding force.

Safety rules for work with neodymium magnets
Fire warning

Fire warning: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Crushing force

Danger of trauma: The pulling power is so great that it can result in blood blisters, crushing, and broken bones. Protective gloves are recommended.

Keep away from electronics

Navigation devices and smartphones are extremely susceptible to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.

Data carriers

Data protection: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

Warning for heart patients

For implant holders: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Handling rules

Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Magnets are brittle

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Keep away from children

Only for adults. Small elements can be swallowed, causing severe trauma. Keep away from children and animals.

Do not overheat magnets

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

Warning for allergy sufferers

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, immediately stop handling magnets and wear gloves.

Safety First! Looking for details? Check our post: Are neodymium magnets dangerous?