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MPL 40x18x10 SH / N38 - lamellar magnet

lamellar magnet

Catalog no 020157

GTIN/EAN: 5906301811633

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

36.29 with VAT / pcs + price for transport

29.50 ZŁ net + 23% VAT / pcs

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Product card - MPL 40x18x10 SH / N38 - lamellar magnet

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

properties
properties values
Cat. no. 020157
GTIN/EAN 5906301811633
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 SH / 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 analysis of the product - report

Presented information are the direct effect of a mathematical calculation. Results are based on algorithms for the class Nd2Fe14B. Operational conditions may deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.

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

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 3666 Gs
366.6 mT
23.81 kg / 23810.0 g
233.6 N
crushing
1 mm 3399 Gs
339.9 mT
20.48 kg / 20476.1 g
200.9 N
crushing
2 mm 3120 Gs
312.0 mT
17.25 kg / 17245.9 g
169.2 N
crushing
3 mm 2841 Gs
284.1 mT
14.30 kg / 14304.1 g
140.3 N
crushing
5 mm 2321 Gs
232.1 mT
9.55 kg / 9547.8 g
93.7 N
warning
10 mm 1370 Gs
137.0 mT
3.32 kg / 3324.4 g
32.6 N
warning
15 mm 833 Gs
83.3 mT
1.23 kg / 1229.0 g
12.1 N
weak grip
20 mm 530 Gs
53.0 mT
0.50 kg / 498.1 g
4.9 N
weak grip
30 mm 244 Gs
24.4 mT
0.11 kg / 105.3 g
1.0 N
weak grip
50 mm 75 Gs
7.5 mT
0.01 kg / 9.9 g
0.1 N
weak grip

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

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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 40x18x10 SH / N38

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

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

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
5%
1.19 kg / 1190.5 g
11.7 N
1 mm
13%
2.98 kg / 2976.3 g
29.2 N
2 mm
25%
5.95 kg / 5952.5 g
58.4 N
5 mm
63%
14.88 kg / 14881.3 g
146.0 N
10 mm
100%
23.81 kg / 23810.0 g
233.6 N

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

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

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

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 59.64 kg / 59645 g
585.1 N
5 034 Gs
N/A
1 mm 55.50 kg / 55499 g
544.4 N
7 072 Gs
49.95 kg / 49949 g
490.0 N
~0 Gs
2 mm 51.29 kg / 51293 g
503.2 N
6 799 Gs
46.16 kg / 46164 g
452.9 N
~0 Gs
3 mm 47.18 kg / 47176 g
462.8 N
6 520 Gs
42.46 kg / 42459 g
416.5 N
~0 Gs
5 mm 39.41 kg / 39410 g
386.6 N
5 959 Gs
35.47 kg / 35469 g
348.0 N
~0 Gs
10 mm 23.92 kg / 23918 g
234.6 N
4 643 Gs
21.53 kg / 21526 g
211.2 N
~0 Gs
20 mm 8.33 kg / 8328 g
81.7 N
2 739 Gs
7.49 kg / 7495 g
73.5 N
~0 Gs
50 mm 0.55 kg / 552 g
5.4 N
705 Gs
0.50 kg / 497 g
4.9 N
~0 Gs

Table 7: Hazards (electronics) - precautionary measures
MPL 40x18x10 SH / 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: Impact energy (kinetic energy) - warning
MPL 40x18x10 SH / 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: Surface protection spec
MPL 40x18x10 SH / 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 SH / N38

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

Table 11: Hydrostatics and buoyancy
MPL 40x18x10 SH / N38

Environment Effective steel pull Effect
Air (land) 23.81 kg Standard
Water (riverbed) 27.26 kg
(+3.45 kg Buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

*Warning: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.

2. Plate thickness effect

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

3. Temperature resistance

*For N38 material, the safety limit is 80°C.

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

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

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.

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%
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: 020157-2025
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Pulling force

Field Strength

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Model MPL 40x18x10 SH / N38 features a flat shape and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 23.81 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 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 SH / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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.
Plate magnets MPL 40x18x10 SH / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 23.81 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 40x18x10 SH / N38, it is best to use strong epoxy glues (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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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 40x18x10 mm, which, at a weight of 54 g, makes it an element with impressive energy density. The key parameter here is the holding force amounting to approximately 23.81 kg (force ~233.58 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of neodymium magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • They have constant strength, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They are extremely resistant to demagnetization induced by external field influence,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
  • Possibility of exact forming and adapting to atypical applications,
  • Key role in future technologies – they find application in data components, brushless drives, precision medical tools, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in miniature devices

Cons

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Limited ability of creating nuts in the magnet and complex forms - preferred is casing - magnet mounting.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these devices can complicate diagnosis medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum holding power of the magnet – what contributes to it?

The force parameter is a result of laboratory testing executed under standard conditions:
  • with the application of a sheet made of special test steel, guaranteeing maximum field concentration
  • whose transverse dimension equals approx. 10 mm
  • with an ground contact surface
  • without any air gap between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Key elements affecting lifting force

Real force impacted by working environment parameters, such as (from most important):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Plate material – mild steel attracts best. Alloy admixtures reduce magnetic permeability and holding force.
  • Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Fragile material

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets will cause them shattering into shards.

Safe operation

Handle with care. Rare earth magnets attract from a long distance and snap with huge force, often faster than you can move away.

Protect data

Very strong magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Medical interference

People with a pacemaker should maintain an safe separation from magnets. The magnetism can disrupt the operation of the life-saving device.

Threat to navigation

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Swallowing risk

These products are not intended for children. Eating a few magnets can lead to them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

Operating temperature

Avoid heat. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Physical harm

Large magnets can smash fingers in a fraction of a second. Do not place your hand between two strong magnets.

Dust is flammable

Fire hazard: Neodymium dust is explosive. Do not process magnets in home conditions as this may cause fire.

Nickel coating and allergies

Medical facts indicate that nickel (the usual finish) is a potent allergen. For allergy sufferers, prevent direct skin contact or opt for coated magnets.

Important! Want to know more? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98