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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

31.00 with VAT / pcs + price for transport

25.20 ZŁ net + 23% VAT / pcs

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Technical - 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 simulation of the product - technical parameters

The following data are the direct effect of a physical analysis. Results rely on models for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Use these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - 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
weak grip
20 mm 574 Gs
57.4 mT
0.66 kg / 1.46 LBS
664.0 g / 6.5 N
weak grip
30 mm 267 Gs
26.7 mT
0.14 kg / 0.32 LBS
143.7 g / 1.4 N
weak grip
50 mm 82 Gs
8.2 mT
0.01 kg / 0.03 LBS
13.7 g / 0.1 N
weak grip

Table 2: Sliding 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

Table 3: Wall mounting (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

Table 4: Steel thickness (saturation) - 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

Table 5: Thermal resistance (material behavior) - thermal limit
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

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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

Table 7: Safety (HSE) (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
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

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

Table 9: Corrosion resistance
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)

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)

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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Note: On a vertical wall, the magnet holds only ~20% of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely limits 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) = 0.42

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
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: 020158-2026
Quick Unit Converter
Force (pull)

Magnetic Field

Check out also proposals

Component MPL 40x20x10 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. As a block magnet with high power (approx. 24.62 kg), this product is available off-the-shelf from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating protects 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. To separate the MPL 40x20x10 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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. 24.62 kg), they are ideal as closers 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.
For mounting flat magnets MPL 40x20x10 / N38, it is best to use strong epoxy glues (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 40x20x10 mm, which, at a weight of 60 g, makes it an element with impressive energy density. 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 product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Pros

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • They feature excellent resistance to magnetic field loss when exposed to external fields,
  • Thanks to the metallic finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of individual modeling and adjusting to individual needs,
  • Fundamental importance in modern technologies – they are utilized in data components, electric drive systems, medical devices, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using cover - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these magnets can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnetwhat it depends on?

Breakaway force is the result of a measurement for optimal configuration, taking into account:
  • on a base made of mild steel, optimally conducting the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Lifting capacity in real conditions – factors

Effective lifting capacity impacted by specific conditions, such as (from priority):
  • Air gap (betwixt the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy admixtures decrease magnetic permeability and holding force.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate decreases the load capacity.

H&S for magnets
Electronic devices

Intense magnetic fields can destroy records on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Dust is flammable

Fire hazard: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Swallowing risk

Product intended for adults. Tiny parts can be swallowed, leading to severe trauma. Keep out of reach of children and animals.

Permanent damage

Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.

Warning for heart patients

People with a heart stimulator have to maintain an absolute distance from magnets. The magnetic field can interfere with the operation of the life-saving device.

Physical harm

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

Avoid contact if allergic

Studies show that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent direct skin contact or choose encased magnets.

Keep away from electronics

A strong magnetic field interferes with the functioning of compasses in phones and GPS navigation. Do not bring magnets close to a device to prevent breaking the sensors.

Material brittleness

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Do not underestimate power

Use magnets with awareness. Their immense force can shock even experienced users. Be vigilant and respect their force.

Attention! More info about hazards in the article: Safety of working with magnets.