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MPL 40x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020158

GTIN/EAN: 5906301811640

length

40 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

60 g

Magnetization Direction

↑ axial

Load capacity

24.62 kg / 241.53 N

Magnetic Induction

349.60 mT / 3496 Gs

Coating

[NiCuNi] Nickel

technical specifications »

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Technical details - MPL 40x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 40x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020158
GTIN/EAN 5906301811640
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 40 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 60 g
Magnetization Direction ↑ axial
Load capacity ~ ? 24.62 kg / 241.53 N
Magnetic Induction ~ ? 349.60 mT / 3496 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x20x10 / 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 analysis of the assembly - technical parameters

The following data constitute the result of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Please consider these calculations as a supplementary guide for designers.

Table 1: Static force (force vs distance) - interaction chart
MPL 40x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3495 Gs
349.5 mT
 24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
 crushing
1 mm 3272 Gs
327.2 mT
 21.58 kg / 47.57 lbs
21578.0 g / 211.7 N
 crushing
2 mm 3035 Gs
303.5 mT
 18.56 kg / 40.92 lbs
18559.3 g / 182.1 N
 crushing
3 mm 2794 Gs
279.4 mT
 15.73 kg / 34.69 lbs
15733.0 g / 154.3 N
 crushing
5 mm 2332 Gs
233.2 mT
 10.96 kg / 24.16 lbs
10959.2 g / 107.5 N
 crushing
10 mm 1433 Gs
143.3 mT
 4.14 kg / 9.12 lbs
4136.4 g / 40.6 N
 medium risk
15 mm 891 Gs
89.1 mT
 1.60 kg / 3.52 lbs
1598.7 g / 15.7 N
 safe
20 mm 574 Gs
57.4 mT
 0.66 kg / 1.46 lbs
664.0 g / 6.5 N
 safe
30 mm 267 Gs
26.7 mT
 0.14 kg / 0.32 lbs
143.7 g / 1.4 N
 safe
50 mm 82 Gs
8.2 mT
 0.01 kg / 0.03 lbs
13.7 g / 0.1 N
 safe
Pulling power decreases sharply per each millimeter of spacing. Remember that every additional insulation layer (e.g., contamination, varnish, rust) noticeably weakens the grip. Magnets work strongest in perfect adhesion; gap nullifies the force. See how rapidly the pull force fall, when the magnet does not adhere tightly to the steel surface. When planning the mounting, avoid redundant distances.

Table 2: Vertical force (vertical surface)
MPL 40x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.92 kg / 10.86 lbs
4924.0 g / 48.3 N
1 mm Stal (~0.2) 4.32 kg / 9.52 lbs
4316.0 g / 42.3 N
2 mm Stal (~0.2) 3.71 kg / 8.18 lbs
3712.0 g / 36.4 N
3 mm Stal (~0.2) 3.15 kg / 6.94 lbs
3146.0 g / 30.9 N
5 mm Stal (~0.2) 2.19 kg / 4.83 lbs
2192.0 g / 21.5 N
10 mm Stal (~0.2) 0.83 kg / 1.83 lbs
828.0 g / 8.1 N
15 mm Stal (~0.2) 0.32 kg / 0.71 lbs
320.0 g / 3.1 N
20 mm Stal (~0.2) 0.13 kg / 0.29 lbs
132.0 g / 1.3 N
30 mm Stal (~0.2) 0.03 kg / 0.06 lbs
28.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
This section presents the estimated weight limit needed to start the slippage of the magnet down along a vertical metal surface (assuming standard friction coefficient). This parameter is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.39 kg / 16.28 lbs
7386.0 g / 72.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.92 kg / 10.86 lbs
4924.0 g / 48.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.46 kg / 5.43 lbs
2462.0 g / 24.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.31 kg / 27.14 lbs
12310.0 g / 120.8 N
When mounting a holder on a upright plane (e.g., a board), it will only hold barely approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that products slip easier than they pop off the substrate. Want to create a hanger? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will slide down under a noticeably lighter load. Using a rubber layer can effectively improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 40x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.23 kg / 2.71 lbs
1231.0 g / 12.1 N
1 mm
13%
 3.08 kg / 6.78 lbs
3077.5 g / 30.2 N
2 mm
25%
 6.16 kg / 13.57 lbs
6155.0 g / 60.4 N
3 mm
38%
 9.23 kg / 20.35 lbs
9232.5 g / 90.6 N
5 mm
63%
 15.39 kg / 33.92 lbs
15387.5 g / 151.0 N
10 mm
100%
 24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
11 mm
100%
 24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
12 mm
100%
 24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
A too thin steel is incapable of take in the entire magnetic field, which squanders power of the magnet. Should you install a neodymium to a thin surface, the magnetism will penetrate right through and the holding will be smaller. To squeeze full efficiency of this neodymium's power, you need a suitably thick piece of steel. The material oversaturation causes that on thin elements (e.g., thin profiles), the holder works worse. We advise picking the steel dimension based on the following data.

Table 5: Working in heat (stability) - power drop
MPL 40x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
 OK
40 °C -2.2% 24.08 kg / 53.08 lbs
24078.4 g / 236.2 N
 OK
60 °C -4.4% 23.54 kg / 51.89 lbs
23536.7 g / 230.9 N
80 °C -6.6% 23.00 kg / 50.70 lbs
22995.1 g / 225.6 N
100 °C -28.8% 17.53 kg / 38.65 lbs
17529.4 g / 172.0 N
Standard neodymium magnets irreversibly lose parameters after exceeding the maximum temperature. Watch out for overheating – heat can irreversibly destroy this product. With every degree above norm, the neodymium's force temporarily drops. Do not use this magnet near heat sources exceeding its safe range. Ignoring the limit will cause destruction of magnetism.
*Engineering note: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (pancake types) risk losing magnetic properties under lower heat stress compared to rod magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 40x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 60.25 kg / 132.83 lbs
4 926 Gs
9.04 kg / 19.93 lbs
9038 g / 88.7 N
 N/A
1 mm 56.58 kg / 124.73 lbs
6 774 Gs
8.49 kg / 18.71 lbs
8487 g / 83.3 N
 50.92 kg / 112.26 lbs
~0 Gs
2 mm 52.81 kg / 116.42 lbs
6 544 Gs
7.92 kg / 17.46 lbs
7921 g / 77.7 N
 47.53 kg / 104.78 lbs
~0 Gs
3 mm 49.07 kg / 108.19 lbs
6 309 Gs
7.36 kg / 16.23 lbs
7361 g / 72.2 N
 44.17 kg / 97.37 lbs
~0 Gs
5 mm 41.89 kg / 92.34 lbs
5 828 Gs
6.28 kg / 13.85 lbs
6283 g / 61.6 N
 37.70 kg / 83.11 lbs
~0 Gs
10 mm 26.82 kg / 59.13 lbs
4 664 Gs
4.02 kg / 8.87 lbs
4023 g / 39.5 N
 24.14 kg / 53.22 lbs
~0 Gs
20 mm 10.12 kg / 22.32 lbs
2 865 Gs
1.52 kg / 3.35 lbs
1518 g / 14.9 N
 9.11 kg / 20.09 lbs
~0 Gs
50 mm 0.73 kg / 1.61 lbs
769 Gs
0.11 kg / 0.24 lbs
109 g / 1.1 N
 0.66 kg / 1.45 lbs
~0 Gs
60 mm 0.35 kg / 0.78 lbs
534 Gs
0.05 kg / 0.12 lbs
53 g / 0.5 N
 0.32 kg / 0.70 lbs
~0 Gs
70 mm 0.18 kg / 0.40 lbs
383 Gs
0.03 kg / 0.06 lbs
27 g / 0.3 N
 0.16 kg / 0.36 lbs
~0 Gs
80 mm 0.10 kg / 0.22 lbs
282 Gs
0.01 kg / 0.03 lbs
15 g / 0.1 N
 0.09 kg / 0.20 lbs
~0 Gs
90 mm 0.06 kg / 0.12 lbs
214 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.11 lbs
~0 Gs
100 mm 0.03 kg / 0.07 lbs
165 Gs
0.01 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.07 lbs
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and sheet combination. Such a system of two magnets generates a stronger field and a further horizon of operation. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is huge. The levitation is a bit weaker than the connection force, but still large.
*Field value for N-N configuration is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).
Attention: Figures apply to friction force of two same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - warnings
MPL 40x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.5 cm
Hearing aid 10 Gs (1.0 mT) 11.5 cm
Timepiece 20 Gs (2.0 mT) 9.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.0 cm
Car key 50 Gs (5.0 mT) 6.5 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Powerful magnet radiation is a large risk to electronics and pacemakers. These NdFeB products generate a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and housings. Special caution must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
MPL 40x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.47 km/h
(6.24 m/s)
 1.17 J
30 mm 35.51 km/h
(9.86 m/s)
 2.92 J
50 mm 45.70 km/h
(12.69 m/s)
 4.83 J
100 mm 64.60 km/h
(17.95 m/s)
 9.66 J
Neodymium magnets are delicate – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely becomes dangerous. Kinetic force can cause material chips or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
MPL 40x20x10 / 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 following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MPL 40x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 28 125 Mx 281.2 µWb
Pc Coefficient 0.42 Low (Flat)
Flux value passing through the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 40x20x10 / N38

Environment Effective steel pull Effect
Air (land) 24.62 kg Standard
Water (riverbed) 28.19 kg
(+3.57 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!
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its max power.

2. Steel saturation

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

3. Power loss vs temp

*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) = 0.42

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.

Engineering data and GPSR
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%
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: 020158-2026
Magnet Unit Converter
Magnet pull force
Field Strength
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Model MPL 40x20x10 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 24.62 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 24.62 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 40x20x10 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. 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. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 40x20x10 / N38 model is magnetized through the thickness (dimension 10 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (40x20 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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 20 mm (width), and 10 mm (thickness). The key parameter here is the holding force amounting to approximately 24.62 kg (force ~241.53 N), which, with such a flat shape, proves the high power 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 long-term stability, neodymium magnets provide the following advantages:
  • Their strength is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under strong external field,
  • In other words, due to the aesthetic finish of nickel, the element becomes visually attractive,
  • Magnets possess exceptionally strong magnetic induction on the outer side,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
  • Considering the potential of flexible shaping and adaptation to individualized projects, neodymium magnets can be modeled in a wide range of shapes and sizes, which increases their versatility,
  • Universal use in future technologies – they are commonly used in mass storage devices, motor assemblies, medical devices, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions

Limitations

Disadvantages of neodymium 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 weakening 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 extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We recommend a housing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Potential hazard resulting from small fragments of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Magnetic strength at its maximum – what affects it?

The declared magnet strength refers to the maximum value, measured under laboratory conditions, namely:
  • with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with a plane cleaned and smooth
  • without the slightest insulating layer between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • in neutral thermal conditions

Key elements affecting lifting force

Effective lifting capacity is affected by specific conditions, mainly (from priority):
  • Clearance – the presence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

H&S for magnets
Dust is flammable

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

Sensitization to coating

Some people experience a contact allergy to nickel, which is the typical protective layer for NdFeB magnets. Extended handling may cause dermatitis. It is best to wear protective gloves.

Heat sensitivity

Do not overheat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, look for HT versions (H, SH, UH).

Pinching danger

Pinching hazard: The pulling power is so immense that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Swallowing risk

Always store magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are tragic.

Electronic hazard

Very strong magnetic fields can erase data on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Magnetic interference

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Implant safety

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Material brittleness

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Safe operation

Use magnets consciously. Their huge power can surprise even professionals. Be vigilant and respect their force.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?