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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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Physical properties - 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

Physical analysis of the assembly - report

Presented data represent the result of a physical calculation. Results are based on algorithms for the material Nd2Fe14B. Actual conditions may deviate from the simulation results. Treat these data as a reference point for designers.

Table 1: Static pull force (pull vs distance) - 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
critical level
1 mm 3399 Gs
339.9 mT
20.48 kg / 45.14 lbs
20476.1 g / 200.9 N
critical level
2 mm 3120 Gs
312.0 mT
17.25 kg / 38.02 lbs
17245.9 g / 169.2 N
critical level
3 mm 2841 Gs
284.1 mT
14.30 kg / 31.54 lbs
14304.1 g / 140.3 N
critical level
5 mm 2321 Gs
232.1 mT
9.55 kg / 21.05 lbs
9547.8 g / 93.7 N
warning
10 mm 1370 Gs
137.0 mT
3.32 kg / 7.33 lbs
3324.4 g / 32.6 N
warning
15 mm 833 Gs
83.3 mT
1.23 kg / 2.71 lbs
1229.0 g / 12.1 N
weak grip
20 mm 530 Gs
53.0 mT
0.50 kg / 1.10 lbs
498.1 g / 4.9 N
weak grip
30 mm 244 Gs
24.4 mT
0.11 kg / 0.23 lbs
105.3 g / 1.0 N
weak grip
50 mm 75 Gs
7.5 mT
0.01 kg / 0.02 lbs
9.9 g / 0.1 N
weak grip

Table 2: Sliding 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

Table 3: Vertical assembly (sliding) - vertical pull
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

Table 4: Steel thickness (saturation) - sheet metal selection
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

Table 5: Thermal stability (stability) - resistance threshold
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

Table 6: Two magnets (attraction) - 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

Table 7: Safety (HSE) (implants) - warnings
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
Mobile device 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

Table 8: Dynamics (kinetic energy) - collision effects
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: Anti-corrosion coating durability
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: 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)

Table 11: Physics of underwater searching
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains only ~20% of its max power.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Thermal stability

*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) = 0.43

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
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: 020157-2026
Magnet Unit Converter
Force (pull)

Field Strength

Other deals

This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 40x18x10 mm and a weight of 54 g, guarantees premium class connection. This magnetic block with a force of 233.58 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 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 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. 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. They work great as invisible mounts 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.
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. 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. In practice, this means that this magnet has the greatest attraction force on its main planes (40x18 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 18 mm (width), and 10 mm (thickness). 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 power of the material. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of rare earth magnets.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • Magnets effectively defend themselves against demagnetization caused by external fields,
  • Thanks to the reflective finish, the layer of Ni-Cu-Ni, gold-plated, or silver-plated gives an clean appearance,
  • Magnetic induction on the working layer of the magnet is exceptional,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Considering the potential of flexible forming and customization to individualized projects, magnetic components can be modeled in a broad palette of shapes and sizes, which makes them more universal,
  • Significant place in modern industrial fields – they are commonly used in hard drives, electric drive systems, medical equipment, also industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in compact constructions

Cons

What to avoid - cons of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complex shapes in magnets, we recommend using cover - magnetic mount.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

The specified lifting capacity concerns the maximum value, obtained under optimal environment, specifically:
  • using a base made of high-permeability steel, acting as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • with a plane free of scratches
  • without any clearance between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at conditions approx. 20°C

Magnet lifting force in use – key factors

Please note that the working load will differ influenced by the following factors, in order of importance:
  • Distance (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Plate material – low-carbon steel attracts best. Higher carbon content reduce magnetic permeability and holding force.
  • Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with neodymium magnets
Data carriers

Avoid bringing magnets near a purse, computer, or screen. The magnetism can destroy these devices and wipe information from cards.

Conscious usage

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

Allergy Warning

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness happens, cease handling magnets and use protective gear.

GPS Danger

Remember: neodymium magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, device, and GPS.

Life threat

For implant holders: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Danger to the youngest

Strictly keep magnets out of reach of children. Ingestion danger is significant, and the effects of magnets connecting inside the body are tragic.

Do not overheat magnets

Keep cool. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Flammability

Machining of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Fragile material

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets leads to them cracking into shards.

Crushing risk

Big blocks can smash fingers instantly. Under no circumstances put your hand between two strong magnets.

Important! Learn more about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98