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MPL 40x18x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020156

GTIN/EAN: 5906301811626

5.00

length

40 mm [±0,1 mm]

Width

18 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

54 g

Magnetization Direction

↑ axial

Load capacity

23.81 kg / 233.58 N

Magnetic Induction

366.66 mT / 3667 Gs

Coating

[NiCuNi] Nickel

30.75 with VAT / pcs + price for transport

25.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical - MPL 40x18x10 / N38 - lamellar magnet

Specification / characteristics - MPL 40x18x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020156
GTIN/EAN 5906301811626
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 18 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 54 g
Magnetization Direction ↑ axial
Load capacity ~ ? 23.81 kg / 233.58 N
Magnetic Induction ~ ? 366.66 mT / 3667 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x18x10 / 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 magnet - technical parameters

The following values are the direct effect of a engineering simulation. Results rely on algorithms for the class Nd2Fe14B. Real-world performance may differ. Please consider these data as a reference point during assembly planning.

Table 1: Static force (pull vs distance) - power drop
MPL 40x18x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3666 Gs
366.6 mT
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
critical level
1 mm 3399 Gs
339.9 mT
20.48 kg / 45.14 pounds
20476.1 g / 200.9 N
critical level
2 mm 3120 Gs
312.0 mT
17.25 kg / 38.02 pounds
17245.9 g / 169.2 N
critical level
3 mm 2841 Gs
284.1 mT
14.30 kg / 31.54 pounds
14304.1 g / 140.3 N
critical level
5 mm 2321 Gs
232.1 mT
9.55 kg / 21.05 pounds
9547.8 g / 93.7 N
strong
10 mm 1370 Gs
137.0 mT
3.32 kg / 7.33 pounds
3324.4 g / 32.6 N
strong
15 mm 833 Gs
83.3 mT
1.23 kg / 2.71 pounds
1229.0 g / 12.1 N
safe
20 mm 530 Gs
53.0 mT
0.50 kg / 1.10 pounds
498.1 g / 4.9 N
safe
30 mm 244 Gs
24.4 mT
0.11 kg / 0.23 pounds
105.3 g / 1.0 N
safe
50 mm 75 Gs
7.5 mT
0.01 kg / 0.02 pounds
9.9 g / 0.1 N
safe

Table 2: Slippage capacity (wall)
MPL 40x18x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.76 kg / 10.50 pounds
4762.0 g / 46.7 N
1 mm Stal (~0.2) 4.10 kg / 9.03 pounds
4096.0 g / 40.2 N
2 mm Stal (~0.2) 3.45 kg / 7.61 pounds
3450.0 g / 33.8 N
3 mm Stal (~0.2) 2.86 kg / 6.31 pounds
2860.0 g / 28.1 N
5 mm Stal (~0.2) 1.91 kg / 4.21 pounds
1910.0 g / 18.7 N
10 mm Stal (~0.2) 0.66 kg / 1.46 pounds
664.0 g / 6.5 N
15 mm Stal (~0.2) 0.25 kg / 0.54 pounds
246.0 g / 2.4 N
20 mm Stal (~0.2) 0.10 kg / 0.22 pounds
100.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x18x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.14 kg / 15.75 pounds
7143.0 g / 70.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.76 kg / 10.50 pounds
4762.0 g / 46.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.38 kg / 5.25 pounds
2381.0 g / 23.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
11.91 kg / 26.25 pounds
11905.0 g / 116.8 N

Table 4: Material efficiency (saturation) - power losses
MPL 40x18x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.19 kg / 2.62 pounds
1190.5 g / 11.7 N
1 mm
13%
2.98 kg / 6.56 pounds
2976.3 g / 29.2 N
2 mm
25%
5.95 kg / 13.12 pounds
5952.5 g / 58.4 N
3 mm
38%
8.93 kg / 19.68 pounds
8928.7 g / 87.6 N
5 mm
63%
14.88 kg / 32.81 pounds
14881.3 g / 146.0 N
10 mm
100%
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
11 mm
100%
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
12 mm
100%
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N

Table 5: Thermal resistance (stability) - thermal limit
MPL 40x18x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
OK
40 °C -2.2% 23.29 kg / 51.34 pounds
23286.2 g / 228.4 N
OK
60 °C -4.4% 22.76 kg / 50.18 pounds
22762.4 g / 223.3 N
80 °C -6.6% 22.24 kg / 49.03 pounds
22238.5 g / 218.2 N
100 °C -28.8% 16.95 kg / 37.37 pounds
16952.7 g / 166.3 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 40x18x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 59.64 kg / 131.49 pounds
5 034 Gs
8.95 kg / 19.72 pounds
8947 g / 87.8 N
N/A
1 mm 55.50 kg / 122.35 pounds
7 072 Gs
8.32 kg / 18.35 pounds
8325 g / 81.7 N
49.95 kg / 110.12 pounds
~0 Gs
2 mm 51.29 kg / 113.08 pounds
6 799 Gs
7.69 kg / 16.96 pounds
7694 g / 75.5 N
46.16 kg / 101.77 pounds
~0 Gs
3 mm 47.18 kg / 104.01 pounds
6 520 Gs
7.08 kg / 15.60 pounds
7076 g / 69.4 N
42.46 kg / 93.61 pounds
~0 Gs
5 mm 39.41 kg / 86.88 pounds
5 959 Gs
5.91 kg / 13.03 pounds
5912 g / 58.0 N
35.47 kg / 78.20 pounds
~0 Gs
10 mm 23.92 kg / 52.73 pounds
4 643 Gs
3.59 kg / 7.91 pounds
3588 g / 35.2 N
21.53 kg / 47.46 pounds
~0 Gs
20 mm 8.33 kg / 18.36 pounds
2 739 Gs
1.25 kg / 2.75 pounds
1249 g / 12.3 N
7.49 kg / 16.52 pounds
~0 Gs
50 mm 0.55 kg / 1.22 pounds
705 Gs
0.08 kg / 0.18 pounds
83 g / 0.8 N
0.50 kg / 1.09 pounds
~0 Gs
60 mm 0.26 kg / 0.58 pounds
487 Gs
0.04 kg / 0.09 pounds
40 g / 0.4 N
0.24 kg / 0.52 pounds
~0 Gs
70 mm 0.13 kg / 0.30 pounds
348 Gs
0.02 kg / 0.04 pounds
20 g / 0.2 N
0.12 kg / 0.27 pounds
~0 Gs
80 mm 0.07 kg / 0.16 pounds
256 Gs
0.01 kg / 0.02 pounds
11 g / 0.1 N
0.07 kg / 0.14 pounds
~0 Gs
90 mm 0.04 kg / 0.09 pounds
194 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
0.04 kg / 0.08 pounds
~0 Gs
100 mm 0.02 kg / 0.05 pounds
149 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
0.02 kg / 0.05 pounds
~0 Gs

Table 7: Hazards (electronics) - precautionary measures
MPL 40x18x10 / 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
Car key 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

Table 8: Dynamics (kinetic energy) - warning
MPL 40x18x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.95 km/h
(6.38 m/s)
1.10 J
30 mm 36.78 km/h
(10.22 m/s)
2.82 J
50 mm 47.37 km/h
(13.16 m/s)
4.67 J
100 mm 66.97 km/h
(18.60 m/s)
9.34 J

Table 9: Anti-corrosion coating durability
MPL 40x18x10 / 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 40x18x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 26 060 Mx 260.6 µWb
Pc Coefficient 0.43 Low (Flat)

Table 11: Physics of underwater searching
MPL 40x18x10 / N38

Environment Effective steel pull Effect
Air (land) 23.81 kg Standard
Water (riverbed) 27.26 kg
(+3.45 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

*Caution: On a vertical wall, the magnet retains only a fraction of its nominal pull.

2. Steel saturation

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

3. Thermal stability

*For standard magnets, the max working temp is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.43

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
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%
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: 020156-2026
Measurement Calculator
Force (pull)

Magnetic Field

Other offers

Component MPL 40x18x10 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 233.58 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 40x18x10 / 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. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 40x18x10 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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 40x18x10 / 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. 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 40x18x10 mm, which, at a weight of 54 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 23.81 kg (force ~233.58 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of rare earth magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
  • They feature excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • A magnet with a smooth gold surface has better aesthetics,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • 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...
  • Due to the potential of accurate molding and adaptation to individualized requirements, neodymium magnets can be created in a variety of shapes and sizes, which expands the range of possible applications,
  • Universal use in high-tech industry – they are utilized in mass storage devices, brushless drives, diagnostic systems, as well as complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Limitations

Problematic aspects of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these products are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Holding force characteristics

Magnetic strength at its maximum – what affects it?

Holding force of 23.81 kg is a measurement result executed under standard conditions:
  • on a block made of mild steel, effectively closing the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • without the slightest insulating layer between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at room temperature

Determinants of lifting force in real conditions

In real-world applications, the real power depends on a number of factors, listed from the most important:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Mechanical processing

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Maximum temperature

Keep cool. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Life threat

Patients with a pacemaker must keep an absolute distance from magnets. The magnetism can stop the functioning of the implant.

Impact on smartphones

GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Protect data

Powerful magnetic fields can destroy records on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.

Material brittleness

Neodymium magnets are sintered ceramics, which means they are very brittle. Clashing of two magnets will cause them breaking into small pieces.

Hand protection

Risk of injury: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.

Swallowing risk

Strictly store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are very dangerous.

Immense force

Handle magnets with awareness. Their powerful strength can shock even experienced users. Be vigilant and do not underestimate their power.

Allergic reactions

Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation appears, immediately stop working with magnets and use protective gear.

Warning! More info about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98