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MPL 40x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020158

GTIN/EAN: 5906301811640

Load capacity 24.62 kg / 241.53 N Magnetic Induction 349.60 mT / 3496 Gs
length
40 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
60 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical parameters »

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Product card - 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

Engineering simulation of the assembly - technical parameters

These values are the direct effect of a engineering simulation. Values rely on models for the material Nd2Fe14B. Actual parameters might slightly differ. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - characteristics
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
 critical level
1 mm 3272 Gs
327.2 mT
 21.58 kg / 47.57 lbs
21578.0 g / 211.7 N
 critical level
2 mm 3035 Gs
303.5 mT
 18.56 kg / 40.92 lbs
18559.3 g / 182.1 N
 critical level
3 mm 2794 Gs
279.4 mT
 15.73 kg / 34.69 lbs
15733.0 g / 154.3 N
 critical level
5 mm 2332 Gs
233.2 mT
 10.96 kg / 24.16 lbs
10959.2 g / 107.5 N
 critical level
10 mm 1433 Gs
143.3 mT
 4.14 kg / 9.12 lbs
4136.4 g / 40.6 N
 strong
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
Magnetic force decreases drastically with every subsequent millimeter of distance. Note that even a microscopic distance (e.g., contamination, varnish, veneer) significantly reduces the pull force. Neodymiums work optimally at the point of direct contact; air break kills the force. Analyze how rapidly the pull force drop, when the product does not touch flatly to the steel surface. When calculating the mounting, discard unnecessary gaps.

Table 2: Sliding capacity (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
The following data indicates the estimated weight limit required to cause the sliding of the magnet vertically on a upright steel wall (considering standard friction coefficient). The holding force is relative to the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 placing a element on a vertical surface (e.g., a board), it will only hold only about 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient influence the fact that magnets slip easier than they pop off the substrate. Want to create a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a smooth steel, the element will slide down under a much lighter weight. Utilizing a rubberized 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 cannot absorb the full magnetic flux, which weakens actual performance of the magnet. If you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the pull force will drop sharply. To achieve 100% of this neodymium's power, you need a suitably thick element of metal. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the magnet works worse. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - resistance threshold
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
Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Protect against heat – high temperature can irreversibly demagnetize this magnet. With increasing heat, the magnet's force momentarily decreases. Avoid using this magnet close to heaters higher than its working range. Ignoring the limit will result in irreversible degradation of magnetism.
*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Flat magnets (pancake types) may lose charge permanently under lower heat stress than taller cylinders. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
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 strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. The setup of magnet-to-magnet generates a stronger field and a larger range of operation. Planning to create a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is massive. The repulsion force is marginally weaker than the attraction, but still significant.
*Field value in repulsion mode reaches ~0 Gs in the exact middle of the gap (due to field cancellation).
Important: Figures demonstrate friction force of two same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - 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
Mechanical watch 20 Gs (2.0 mT) 9.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.0 cm
Remote 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
Extremely neodym field poses a real danger to electronics and medical implants. These magnets produce a flux that disrupts operation of sensitive medical devices. Remember: the unseen radiation acts through matter and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MPL 40x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.73 km/h
(6.32 m/s)
 1.20 J
30 mm 24.69 km/h
(6.86 m/s)
 1.41 J
50 mm 24.78 km/h
(6.88 m/s)
 1.42 J
100 mm 24.79 km/h
(6.89 m/s)
 1.42 J
Magnetic elements are very brittle – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can cause material chips or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when working 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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

Parameter Value SI Unit / Description
Magnetic Flux 28 125 Mx 281.2 µWb
Pc Coefficient 0.42 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
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%
Warning: 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

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

2. Steel saturation

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

3. Temperature resistance

*For N38 material, 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%

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: 020158-2026
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 40x20x10 mm and a weight of 60 g, guarantees premium class connection. This rectangular block with a force of 241.53 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 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 24.62 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x20x10 / N38 are the foundation for many industrial devices, such as filters catching filings 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
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 compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They retain attractive force for around 10 years – the loss is just ~1% (based on simulations),
  • They do not lose their magnetic properties even under strong external field,
  • In other words, due to the smooth finish of nickel, the element gains visual value,
  • Magnetic induction on the surface of the magnet is exceptional,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of exact modeling and adapting to precise requirements,
  • Huge importance in advanced technology sectors – they find application in mass storage devices, brushless drives, precision medical tools, also modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose their power 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 stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in creating nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these devices can 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

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

The load parameter shown refers to the limit force, recorded under optimal environment, meaning:
  • using a plate made of low-carbon steel, functioning as a circuit closing element
  • whose transverse dimension equals approx. 10 mm
  • characterized by even structure
  • with zero gap (without paint)
  • under perpendicular force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Please note that the application force may be lower influenced by elements below, in order of importance:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin steel causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Plate material – mild steel attracts best. Alloy steels lower magnetic properties and lifting capacity.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate lowers the load capacity.

Safe handling of neodymium magnets
Dust is flammable

Powder generated during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Impact on smartphones

A powerful magnetic field negatively affects the functioning of compasses in smartphones and navigation systems. Maintain magnets close to a device to prevent damaging the sensors.

Do not give to children

Product intended for adults. Small elements can be swallowed, causing serious injuries. Store out of reach of children and animals.

Safe operation

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

Physical harm

Watch your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Do not overheat magnets

Watch the temperature. Exposing the magnet to high heat will permanently weaken its properties and pulling force.

Keep away from computers

Data protection: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Life threat

People with a pacemaker must maintain an absolute distance from magnets. The magnetism can disrupt the functioning of the implant.

Allergic reactions

Studies show that nickel (the usual finish) is a potent allergen. If you have an allergy, refrain from touching magnets with bare hands or select encased magnets.

Fragile material

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Important! Learn more about risks in the article: Magnet Safety Guide.