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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

Technical simulation of the magnet - report

These data are the result of a physical analysis. Results rely on algorithms for the material Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - power drop
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
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 (shearing) - 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 (substrate influence) - 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 resistance (material behavior) - power drop
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: Magnet-Magnet interaction (attraction) - field collision
MPL 40x18x10 SH / 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 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: 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
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) - 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: Coating parameters (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: Electrical 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: 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%
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. Vertical hold

*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*For standard magnets, 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

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.

Engineering data and GPSR
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%
Environmental data
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
Pulling force

Field Strength

Other offers

This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x18x10 mm and a weight of 54 g, guarantees the highest quality connection. 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 block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 23.81 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 23.81 kg), they are ideal as hidden locks 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.
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 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.
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 lifting capacity 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.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • Their power is durable, and after around ten years it decreases only by ~1% (according to research),
  • They possess excellent resistance to weakening of magnetic properties when exposed to external fields,
  • In other words, due to the smooth layer of nickel, the element gains a professional look,
  • Magnetic induction on the working layer of the magnet remains strong,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to the possibility of precise forming and customization to custom solutions, neodymium magnets can be modeled in a variety of shapes and sizes, which expands the range of possible applications,
  • Key role in electronics industry – they are utilized in data components, electric motors, medical devices, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in small systems

Weaknesses

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power 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 - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price is higher than average,

Pull force analysis

Highest magnetic holding forcewhat it depends on?

The lifting capacity listed is a result of laboratory testing performed under standard conditions:
  • using a base made of high-permeability steel, acting as a ideal flux conductor
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • with zero gap (without impurities)
  • for force acting at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

It is worth knowing that the application force will differ influenced by the following factors, starting with the most relevant:
  • Distance – the presence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.

H&S for magnets
Crushing force

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

Compass and GPS

Remember: neodymium magnets generate a field that confuses sensitive sensors. Maintain a separation from your mobile, device, and navigation systems.

Protect data

Do not bring magnets near a purse, laptop, or screen. The magnetic field can destroy these devices and erase data from cards.

Nickel allergy

It is widely known that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact or choose versions in plastic housing.

Danger to pacemakers

Warning for patients: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Fire warning

Combustion risk: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.

Thermal limits

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

Adults only

Strictly store magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are fatal.

Magnets are brittle

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Caution required

Before starting, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Attention! Looking for details? Read our article: Why are neodymium magnets dangerous?