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MPL 40x10x18 / N38 - lamellar magnet

lamellar magnet

Catalog no 020149

GTIN/EAN: 5906301811558

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

18 mm [±0,1 mm]

Weight

54 g

Magnetization Direction

→ diametrical

Load capacity

16.72 kg / 164.01 N

Magnetic Induction

540.48 mT / 5405 Gs

Coating

[NiCuNi] Nickel

18.45 with VAT / pcs + price for transport

15.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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Product card - MPL 40x10x18 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x18 / N38 - lamellar magnet

properties
properties values
Cat. no. 020149
GTIN/EAN 5906301811558
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 10 mm [±0,1 mm]
Height 18 mm [±0,1 mm]
Weight 54 g
Magnetization Direction → diametrical
Load capacity ~ ? 16.72 kg / 164.01 N
Magnetic Induction ~ ? 540.48 mT / 5405 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x18 / 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 magnet - technical parameters

The following data represent the result of a engineering analysis. Values were calculated on models for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - interaction chart
MPL 40x10x18 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5402 Gs
540.2 mT
16.72 kg / 36.86 LBS
16720.0 g / 164.0 N
critical level
1 mm 4664 Gs
466.4 mT
12.46 kg / 27.48 LBS
12464.6 g / 122.3 N
critical level
2 mm 3970 Gs
397.0 mT
9.03 kg / 19.90 LBS
9028.7 g / 88.6 N
strong
3 mm 3362 Gs
336.2 mT
6.48 kg / 14.28 LBS
6476.4 g / 63.5 N
strong
5 mm 2432 Gs
243.2 mT
3.39 kg / 7.47 LBS
3388.5 g / 33.2 N
strong
10 mm 1220 Gs
122.0 mT
0.85 kg / 1.88 LBS
853.2 g / 8.4 N
weak grip
15 mm 703 Gs
70.3 mT
0.28 kg / 0.62 LBS
282.9 g / 2.8 N
weak grip
20 mm 440 Gs
44.0 mT
0.11 kg / 0.24 LBS
111.1 g / 1.1 N
weak grip
30 mm 203 Gs
20.3 mT
0.02 kg / 0.05 LBS
23.6 g / 0.2 N
weak grip
50 mm 64 Gs
6.4 mT
0.00 kg / 0.01 LBS
2.4 g / 0.0 N
weak grip

Table 2: Slippage load (vertical surface)
MPL 40x10x18 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.34 kg / 7.37 LBS
3344.0 g / 32.8 N
1 mm Stal (~0.2) 2.49 kg / 5.49 LBS
2492.0 g / 24.4 N
2 mm Stal (~0.2) 1.81 kg / 3.98 LBS
1806.0 g / 17.7 N
3 mm Stal (~0.2) 1.30 kg / 2.86 LBS
1296.0 g / 12.7 N
5 mm Stal (~0.2) 0.68 kg / 1.49 LBS
678.0 g / 6.7 N
10 mm Stal (~0.2) 0.17 kg / 0.37 LBS
170.0 g / 1.7 N
15 mm Stal (~0.2) 0.06 kg / 0.12 LBS
56.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.05 LBS
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 40x10x18 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.02 kg / 11.06 LBS
5016.0 g / 49.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.34 kg / 7.37 LBS
3344.0 g / 32.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.67 kg / 3.69 LBS
1672.0 g / 16.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.36 kg / 18.43 LBS
8360.0 g / 82.0 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 40x10x18 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.84 kg / 1.84 LBS
836.0 g / 8.2 N
1 mm
13%
2.09 kg / 4.61 LBS
2090.0 g / 20.5 N
2 mm
25%
4.18 kg / 9.22 LBS
4180.0 g / 41.0 N
3 mm
38%
6.27 kg / 13.82 LBS
6270.0 g / 61.5 N
5 mm
63%
10.45 kg / 23.04 LBS
10450.0 g / 102.5 N
10 mm
100%
16.72 kg / 36.86 LBS
16720.0 g / 164.0 N
11 mm
100%
16.72 kg / 36.86 LBS
16720.0 g / 164.0 N
12 mm
100%
16.72 kg / 36.86 LBS
16720.0 g / 164.0 N

Table 5: Working in heat (material behavior) - resistance threshold
MPL 40x10x18 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 16.72 kg / 36.86 LBS
16720.0 g / 164.0 N
OK
40 °C -2.2% 16.35 kg / 36.05 LBS
16352.2 g / 160.4 N
OK
60 °C -4.4% 15.98 kg / 35.24 LBS
15984.3 g / 156.8 N
OK
80 °C -6.6% 15.62 kg / 34.43 LBS
15616.5 g / 153.2 N
100 °C -28.8% 11.90 kg / 26.25 LBS
11904.6 g / 116.8 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 40x10x18 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 71.96 kg / 158.65 LBS
5 928 Gs
10.79 kg / 23.80 LBS
10794 g / 105.9 N
N/A
1 mm 62.49 kg / 137.76 LBS
10 068 Gs
9.37 kg / 20.66 LBS
9373 g / 91.9 N
56.24 kg / 123.98 LBS
~0 Gs
2 mm 53.65 kg / 118.27 LBS
9 328 Gs
8.05 kg / 17.74 LBS
8047 g / 78.9 N
48.28 kg / 106.44 LBS
~0 Gs
3 mm 45.76 kg / 100.88 LBS
8 615 Gs
6.86 kg / 15.13 LBS
6864 g / 67.3 N
41.18 kg / 90.79 LBS
~0 Gs
5 mm 32.92 kg / 72.58 LBS
7 308 Gs
4.94 kg / 10.89 LBS
4938 g / 48.4 N
29.63 kg / 65.32 LBS
~0 Gs
10 mm 14.58 kg / 32.15 LBS
4 864 Gs
2.19 kg / 4.82 LBS
2188 g / 21.5 N
13.13 kg / 28.94 LBS
~0 Gs
20 mm 3.67 kg / 8.10 LBS
2 441 Gs
0.55 kg / 1.21 LBS
551 g / 5.4 N
3.30 kg / 7.29 LBS
~0 Gs
50 mm 0.21 kg / 0.46 LBS
585 Gs
0.03 kg / 0.07 LBS
32 g / 0.3 N
0.19 kg / 0.42 LBS
~0 Gs
60 mm 0.10 kg / 0.22 LBS
406 Gs
0.02 kg / 0.03 LBS
15 g / 0.1 N
0.09 kg / 0.20 LBS
~0 Gs
70 mm 0.05 kg / 0.12 LBS
293 Gs
0.01 kg / 0.02 LBS
8 g / 0.1 N
0.05 kg / 0.10 LBS
~0 Gs
80 mm 0.03 kg / 0.06 LBS
217 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
0.03 kg / 0.06 LBS
~0 Gs
90 mm 0.02 kg / 0.04 LBS
165 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
0.02 kg / 0.03 LBS
~0 Gs
100 mm 0.01 kg / 0.02 LBS
128 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
0.01 kg / 0.02 LBS
~0 Gs

Table 7: Hazards (electronics) - warnings
MPL 40x10x18 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.5 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Timepiece 20 Gs (2.0 mT) 8.0 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: Impact energy (kinetic energy) - collision effects
MPL 40x10x18 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.30 km/h
(5.08 m/s)
0.70 J
30 mm 30.76 km/h
(8.55 m/s)
1.97 J
50 mm 39.69 km/h
(11.02 m/s)
3.28 J
100 mm 56.12 km/h
(15.59 m/s)
6.56 J

Table 9: Corrosion resistance
MPL 40x10x18 / 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 40x10x18 / N38

Parameter Value SI Unit / Description
Magnetic Flux 21 285 Mx 212.9 µWb
Pc Coefficient 0.79 High (Stable)

Table 11: Hydrostatics and buoyancy
MPL 40x10x18 / N38

Environment Effective steel pull Effect
Air (land) 16.72 kg Standard
Water (riverbed) 19.14 kg
(+2.42 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Caution: On a vertical wall, the magnet holds only ~20% of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Power loss vs temp

*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) = 0.79

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.

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: 020149-2026
Magnet Unit Converter
Magnet pull force

Magnetic Induction

Other products

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x10x18 mm and a weight of 54 g, guarantees premium class connection. As a magnetic bar with high power (approx. 16.72 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 16.72 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 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.
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 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. In practice, this means that this magnet has the greatest attraction force on its main planes (40x10 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 40x10x18 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 16.72 kg (force ~164.01 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Pros and cons of neodymium magnets.

Advantages

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • Their magnetic field is maintained, and after around 10 years it decreases only by ~1% (theoretically),
  • They are noted for resistance to demagnetization induced by external field influence,
  • By covering with a smooth layer of silver, the element gains an nice look,
  • Magnetic induction on the surface of the magnet is very high,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of exact machining and optimizing to atypical needs,
  • Huge importance in modern industrial fields – they are commonly used in data components, electromotive mechanisms, advanced medical instruments, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Cons

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical when they are in the body.
  • Due to neodymium price, their price is relatively high,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Holding force of 16.72 kg is a measurement result performed under the following configuration:
  • on a plate made of structural steel, effectively closing the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • characterized by smoothness
  • without the slightest insulating layer between the magnet and steel
  • under axial force vector (90-degree angle)
  • in temp. approx. 20°C

What influences lifting capacity in practice

Holding efficiency is influenced by working environment parameters, such as (from priority):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick plate causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Thermal factor – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Warnings
Impact on smartphones

Remember: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a separation from your phone, device, and GPS.

Fire warning

Powder created during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Do not give to children

Strictly keep magnets away from children. Choking hazard is significant, and the effects of magnets clamping inside the body are very dangerous.

Crushing risk

Protect your hands. Two powerful magnets will snap together instantly with a force of massive weight, destroying anything in their path. Be careful!

Powerful field

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

Life threat

Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Skin irritation risks

Medical facts indicate that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent touching magnets with bare hands or select coated magnets.

Data carriers

Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Heat sensitivity

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Material brittleness

Protect your eyes. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Warning! Looking for details? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98