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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

check parameters »

4.54 ZŁ with VAT / pcs + price for transport

3.69 ZŁ net + 23% VAT / pcs

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Technical data - 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 modeling of the assembly - data

The following information constitute the outcome of a mathematical calculation. Results were calculated on models for the material Nd2Fe14B. Real-world conditions might slightly differ. Use these calculations as a reference point during assembly planning.

Table 1: Static force (pull vs distance) - characteristics
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
 strong
1 mm 3035 Gs
303.5 mT
 4.64 kg / 10.23 LBS
4641.8 g / 45.5 N
 strong
2 mm 2558 Gs
255.8 mT
 3.30 kg / 7.27 LBS
3298.0 g / 32.4 N
 strong
3 mm 2120 Gs
212.0 mT
 2.26 kg / 4.99 LBS
2264.8 g / 22.2 N
 strong
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
Grip strength drops sharply per each millimeter of spacing. Keep in mind that even the smallest gap (e.g., dirt, varnish, dust) strongly diminishes the holding power. Magnetic products hold strongest in perfect adhesion; air break weakens the force. Notice how flashily the parameters plummet, when the product does not touch flatly to the steel surface. When designing the mounting, eliminate unnecessary gaps.

Table 2: Sliding capacity (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
The following data defines the approximate shear load sufficient to start the sliding of the magnet down on a vertical steel plate (considering standard friction coefficient). This value is relative to the separation distance between the magnet and the metal.

Table 3: Vertical assembly (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
When placing a magnet on a upright plane (e.g., a fridge), it will only hold just approx. 1/5 of its maximum pull force. Gravitational force and a weak degree of grip influence the fact that holders move down easier than they detach. Designing a vertical fastening? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will slide down under a much lighter weight. Utilizing a rubberized coating can significantly raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
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
A too thin steel is unable to take in the entire magnetic field, which weakens actual performance of the magnet. Should you install a neodymium to a thin surface, the magnetism will penetrate right through and the pull force will drop sharply. To utilize 100% of this neodymium's potential, you need a suitably thick backing of metal. The material oversaturation causes that on delicate walls (e.g., thin profiles), the magnet works worse. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - resistance threshold
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
Classic neodymiums lose parameters past the thermal threshold. Watch out for overheating – high temperature can irreversibly damage this product. As the temperature rises, the neodymium's force momentarily decreases. Avoid using this product close to heaters higher than its operating temperature limit. Exceeding the critical threshold will result in irreversible degradation of magnetism.
*Technical advisory: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table signals permanent field degradation for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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
Two magnetic products attract each other from a significantly greater distance than a magnet and sheet setup. The setup of two magnets creates a more powerful interaction and a larger range of operation. Planning to create a solid fastener? Apply two magnets instead of a neodymium and a steel. Remember that when bringing together two magnets, the collision energy is huge. The levitation is a bit weaker than the attraction, but still large.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Important: Estimates refer to sliding force of two same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (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
Remote 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
Powerful magnet radiation poses a real danger to electronics as well as medical implants. These magnets produce a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
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
Neodymium magnets are prone to chipping – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when handling with powerful specimens.

Table 9: Anti-corrosion coating 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MPL 20x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 031 Mx 70.3 µWb
Pc Coefficient 0.42 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data for generator designers and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
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!
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

*Note: On a vertical surface, the magnet retains just a fraction of its max power.

2. Steel saturation

*Thin steel (e.g. computer case) severely reduces the holding force.

3. Power loss vs temp

*For standard magnets, 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%
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: 020128-2026
Measurement Calculator
Force (pull)
Magnetic Induction
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Model MPL 20x10x5 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 6.15 kg), this product is available off-the-shelf from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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. Watch your fingers! Magnets with a force of 6.15 kg can pinch very hard and cause hematomas. 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. 6.15 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for hanging tools 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. 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.
The presented product is a neodymium magnet with precisely defined parameters: 20 mm (length), 10 mm (width), and 5 mm (thickness). 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 grade of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even during nearly 10 years – the decrease in strength is only ~1% (based on measurements),
  • They retain their magnetic properties even under close interference source,
  • A magnet with a metallic nickel surface looks better,
  • Magnetic induction on the surface of the magnet is impressive,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • In view of the potential of precise shaping and customization to custom solutions, neodymium magnets can be created in a variety of geometric configurations, which amplifies use scope,
  • Fundamental importance in modern industrial fields – they are used in hard drives, brushless drives, medical equipment, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum holding power of the magnet – what affects it?

The lifting capacity listed is a result of laboratory testing performed under specific, ideal conditions:
  • on a block made of mild steel, optimally conducting the magnetic field
  • whose thickness reaches at least 10 mm
  • with a surface perfectly flat
  • without any air gap between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at standard ambient temperature

Magnet lifting force in use – key factors

During everyday use, the real power depends on several key aspects, presented from most significant:
  • Gap (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under shearing force the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Safe handling of neodymium magnets
Do not drill into magnets

Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Health Danger

Warning for patients: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Allergic reactions

Some people have a sensitization to nickel, which is the standard coating for NdFeB magnets. Prolonged contact might lead to a rash. We recommend wear safety gloves.

Powerful field

Handle magnets with awareness. Their immense force can shock even professionals. Plan your moves and do not underestimate their power.

Fragile material

Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. Wear goggles.

Magnetic media

Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Heat warning

Standard neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Bone fractures

Protect your hands. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Precision electronics

GPS units and mobile phones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Do not give to children

These products are not suitable for play. Accidental ingestion of a few magnets can lead to them connecting inside the digestive tract, which poses a critical condition and necessitates immediate surgery.

Danger! Want to know more? Read our article: Why are neodymium magnets dangerous?