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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

see technical data »

36.29 ZŁ with VAT / pcs + price for transport

29.50 ZŁ net + 23% VAT / pcs

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Technical of the product - 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

Technical analysis of the product - report

Presented values constitute the outcome of a engineering analysis. Values rely on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs gap) - interaction chart
MPL 40x18x10 SH / 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 lbs
23810.0 g / 233.6 N
 crushing
1 mm 3399 Gs
339.9 mT
 20.48 kg / 45.14 lbs
20476.1 g / 200.9 N
 crushing
2 mm 3120 Gs
312.0 mT
 17.25 kg / 38.02 lbs
17245.9 g / 169.2 N
 crushing
3 mm 2841 Gs
284.1 mT
 14.30 kg / 31.54 lbs
14304.1 g / 140.3 N
 crushing
5 mm 2321 Gs
232.1 mT
 9.55 kg / 21.05 lbs
9547.8 g / 93.7 N
 strong
10 mm 1370 Gs
137.0 mT
 3.32 kg / 7.33 lbs
3324.4 g / 32.6 N
 strong
15 mm 833 Gs
83.3 mT
 1.23 kg / 2.71 lbs
1229.0 g / 12.1 N
 low risk
20 mm 530 Gs
53.0 mT
 0.50 kg / 1.10 lbs
498.1 g / 4.9 N
 low risk
30 mm 244 Gs
24.4 mT
 0.11 kg / 0.23 lbs
105.3 g / 1.0 N
 low risk
50 mm 75 Gs
7.5 mT
 0.01 kg / 0.02 lbs
9.9 g / 0.1 N
 low risk
Magnetic force weakens sharply with every subsequent millimeter of distance. Keep in mind that even a microscopic distance (e.g., contamination, paint, rust) noticeably weakens the grip. Neodymiums work strongest during direct contact; distance drastically cuts the power. Observe how rapidly the parameters drop, when the product does not adhere tightly to the metal substrate. When designing the mounting, avoid additional spacers.

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.76 kg / 10.50 lbs
4762.0 g / 46.7 N
1 mm Stal (~0.2) 4.10 kg / 9.03 lbs
4096.0 g / 40.2 N
2 mm Stal (~0.2) 3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
3 mm Stal (~0.2) 2.86 kg / 6.31 lbs
2860.0 g / 28.1 N
5 mm Stal (~0.2) 1.91 kg / 4.21 lbs
1910.0 g / 18.7 N
10 mm Stal (~0.2) 0.66 kg / 1.46 lbs
664.0 g / 6.5 N
15 mm Stal (~0.2) 0.25 kg / 0.54 lbs
246.0 g / 2.4 N
20 mm Stal (~0.2) 0.10 kg / 0.22 lbs
100.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
This section calculates the approximate force sufficient to cause the sliding of the magnet downwards against a vertical steel wall (considering standard friction). The holding force is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 40x18x10 SH / 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 lbs
7143.0 g / 70.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.76 kg / 10.50 lbs
4762.0 g / 46.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.38 kg / 5.25 lbs
2381.0 g / 23.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
11.91 kg / 26.25 lbs
11905.0 g / 116.8 N
When mounting a element on a upright surface (e.g., a car body), it you can count on only approx. 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient cause that holders slip faster than they detach. Want to create a wall mount? Consider that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the holder will slide down under a noticeably lighter cargo. Application of an anti-slip layer can significantly improve the result.

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

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.19 kg / 2.62 lbs
1190.5 g / 11.7 N
1 mm
13%
 2.98 kg / 6.56 lbs
2976.3 g / 29.2 N
2 mm
25%
 5.95 kg / 13.12 lbs
5952.5 g / 58.4 N
3 mm
38%
 8.93 kg / 19.68 lbs
8928.7 g / 87.6 N
5 mm
63%
 14.88 kg / 32.81 lbs
14881.3 g / 146.0 N
10 mm
100%
 23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
11 mm
100%
 23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
12 mm
100%
 23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
A too thin steel cannot conduct the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a too thin substrate, the field 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 material oversaturation means that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 40x18x10 SH / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
 OK
40 °C -2.2% 23.29 kg / 51.34 lbs
23286.2 g / 228.4 N
 OK
60 °C -4.4% 22.76 kg / 50.18 lbs
22762.4 g / 223.3 N
80 °C -6.6% 22.24 kg / 49.03 lbs
22238.5 g / 218.2 N
100 °C -28.8% 16.95 kg / 37.37 lbs
16952.7 g / 166.3 N
Standard neodymium magnets lose parameters above the temperature limit. Watch out for overheating – heat can permanently destroy this magnet. As the temperature rises, the magnet's power briefly decreases. Avoid using this magnet near heat sources higher than its safe range. Exceeding the critical threshold will result in destruction of magnetism.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties sooner than long magnets. The danger warning in the table signals a risk of irreversible loss for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 59.64 kg / 131.49 lbs
5 034 Gs
8.95 kg / 19.72 lbs
8947 g / 87.8 N
 N/A
1 mm 55.50 kg / 122.35 lbs
7 072 Gs
8.32 kg / 18.35 lbs
8325 g / 81.7 N
 49.95 kg / 110.12 lbs
~0 Gs
2 mm 51.29 kg / 113.08 lbs
6 799 Gs
7.69 kg / 16.96 lbs
7694 g / 75.5 N
 46.16 kg / 101.77 lbs
~0 Gs
3 mm 47.18 kg / 104.01 lbs
6 520 Gs
7.08 kg / 15.60 lbs
7076 g / 69.4 N
 42.46 kg / 93.61 lbs
~0 Gs
5 mm 39.41 kg / 86.88 lbs
5 959 Gs
5.91 kg / 13.03 lbs
5912 g / 58.0 N
 35.47 kg / 78.20 lbs
~0 Gs
10 mm 23.92 kg / 52.73 lbs
4 643 Gs
3.59 kg / 7.91 lbs
3588 g / 35.2 N
 21.53 kg / 47.46 lbs
~0 Gs
20 mm 8.33 kg / 18.36 lbs
2 739 Gs
1.25 kg / 2.75 lbs
1249 g / 12.3 N
 7.49 kg / 16.52 lbs
~0 Gs
50 mm 0.55 kg / 1.22 lbs
705 Gs
0.08 kg / 0.18 lbs
83 g / 0.8 N
 0.50 kg / 1.09 lbs
~0 Gs
60 mm 0.26 kg / 0.58 lbs
487 Gs
0.04 kg / 0.09 lbs
40 g / 0.4 N
 0.24 kg / 0.52 lbs
~0 Gs
70 mm 0.13 kg / 0.30 lbs
348 Gs
0.02 kg / 0.04 lbs
20 g / 0.2 N
 0.12 kg / 0.27 lbs
~0 Gs
80 mm 0.07 kg / 0.16 lbs
256 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
 0.07 kg / 0.14 lbs
~0 Gs
90 mm 0.04 kg / 0.09 lbs
194 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.04 kg / 0.08 lbs
~0 Gs
100 mm 0.02 kg / 0.05 lbs
149 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a magnet and sheet combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of performance. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The repulsion force is slightly lower than the attraction, but still significant.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Figures show shear force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - 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
Timepiece 20 Gs (2.0 mT) 8.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Remote 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
A strong magnetic field poses a serious hazard to IT equipment as well as pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - 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
Magnetic elements are prone to chipping – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Wear eye protection when working with large magnets.

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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MPL 40x18x10 SH / N38

Parameter Value SI Unit / Description
Magnetic Flux 26 060 Mx 260.6 µWb
Pc Coefficient 0.43 Low (Flat)
Flux value passing through the pole surface. Essential parameter when building generators and motors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

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

2. Steel thickness impact

*Thin metal sheet (e.g. computer 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 specification and ecology
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: 020157-2026
Measurement Calculator
Pulling force
Magnetic Induction
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Component MPL 40x18x10 SH / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 23.81 kg), this product is available off-the-shelf 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 extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 40x18x10 SH / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners 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. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to roughen and wash 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. This is the most popular configuration for block magnets used in separators and holders.
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 lifting capacity amounting to approximately 23.81 kg (force ~233.58 N), which, with such a compact 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.

Advantages

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • Their power remains stable, and after around 10 years it drops only by ~1% (according to research),
  • Neodymium magnets are characterized by remarkably resistant to demagnetization caused by external field sources,
  • Thanks to the shiny finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an professional appearance,
  • Magnets are distinguished by excellent magnetic induction on the outer layer,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
  • Thanks to versatility in shaping and the capacity to adapt to specific needs,
  • Versatile presence in modern technologies – they serve a role in mass storage devices, electromotive mechanisms, diagnostic systems, also complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their strength 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
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of creating threads in the magnet and complicated shapes - preferred is cover - magnet mounting.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these devices can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

Breakaway force was determined for the most favorable conditions, assuming:
  • using a plate made of low-carbon steel, functioning as a circuit closing element
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by lack of roughness
  • with total lack of distance (no paint)
  • during detachment in a direction perpendicular to the mounting surface
  • in stable room temperature

Key elements affecting lifting force

In practice, the actual lifting capacity is determined by many variables, ranked from the most important:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Steel type – low-carbon steel attracts best. Alloy steels decrease magnetic permeability and holding force.
  • Surface quality – the more even the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets
Impact on smartphones

Navigation devices and smartphones are highly susceptible to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Pinching danger

Danger of trauma: The pulling power is so great that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

Do not drill into magnets

Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Heat warning

Control the heat. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.

Shattering risk

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

ICD Warning

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Do not underestimate power

Exercise caution. Neodymium magnets attract from a long distance and snap with massive power, often quicker than you can react.

Data carriers

Data protection: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Nickel coating and allergies

Allergy Notice: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, cease working with magnets and wear gloves.

Choking Hazard

Neodymium magnets are not intended for children. Eating a few magnets can lead to them attracting across intestines, which constitutes a critical condition and requires urgent medical intervention.

Security! Want to know more? Check our post: Are neodymium magnets dangerous?