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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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Technical of the product - 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

Technical analysis of the magnet - data

Presented information represent the direct effect of a engineering analysis. Results are based on models for the class Nd2Fe14B. Operational parameters may differ. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
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 pounds
16720.0 g / 164.0 N
dangerous!
1 mm 4664 Gs
466.4 mT
12.46 kg / 27.48 pounds
12464.6 g / 122.3 N
dangerous!
2 mm 3970 Gs
397.0 mT
9.03 kg / 19.90 pounds
9028.7 g / 88.6 N
strong
3 mm 3362 Gs
336.2 mT
6.48 kg / 14.28 pounds
6476.4 g / 63.5 N
strong
5 mm 2432 Gs
243.2 mT
3.39 kg / 7.47 pounds
3388.5 g / 33.2 N
strong
10 mm 1220 Gs
122.0 mT
0.85 kg / 1.88 pounds
853.2 g / 8.4 N
weak grip
15 mm 703 Gs
70.3 mT
0.28 kg / 0.62 pounds
282.9 g / 2.8 N
weak grip
20 mm 440 Gs
44.0 mT
0.11 kg / 0.24 pounds
111.1 g / 1.1 N
weak grip
30 mm 203 Gs
20.3 mT
0.02 kg / 0.05 pounds
23.6 g / 0.2 N
weak grip
50 mm 64 Gs
6.4 mT
0.00 kg / 0.01 pounds
2.4 g / 0.0 N
weak grip

Table 2: Vertical force (wall)
MPL 40x10x18 / N38

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

Table 3: Wall mounting (shearing) - 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 pounds
5016.0 g / 49.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.34 kg / 7.37 pounds
3344.0 g / 32.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.67 kg / 3.69 pounds
1672.0 g / 16.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.36 kg / 18.43 pounds
8360.0 g / 82.0 N

Table 4: Material efficiency (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 pounds
836.0 g / 8.2 N
1 mm
13%
2.09 kg / 4.61 pounds
2090.0 g / 20.5 N
2 mm
25%
4.18 kg / 9.22 pounds
4180.0 g / 41.0 N
3 mm
38%
6.27 kg / 13.82 pounds
6270.0 g / 61.5 N
5 mm
63%
10.45 kg / 23.04 pounds
10450.0 g / 102.5 N
10 mm
100%
16.72 kg / 36.86 pounds
16720.0 g / 164.0 N
11 mm
100%
16.72 kg / 36.86 pounds
16720.0 g / 164.0 N
12 mm
100%
16.72 kg / 36.86 pounds
16720.0 g / 164.0 N

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

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

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 40x10x18 / N38

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

Table 7: Safety (HSE) (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
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

Table 8: Impact energy (cracking risk) - warning
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: Anti-corrosion coating durability
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 (Flux)
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: 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 wall, the magnet holds merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.79

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: 020149-2026
Quick Unit Converter
Magnet pull force

Field Strength

See also proposals

Model MPL 40x10x18 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. 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.
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. Watch your fingers! Magnets with a force of 16.72 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of generators and material handling systems. Thanks to the flat surface and high force (approx. 16.72 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 40x10x18 / 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 roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 40x10x18 / N38 model is magnetized through the thickness (dimension 18 mm), which means that the N and S poles are located on its largest, flat surfaces. 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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 10 mm (width), and 18 mm (thickness). It is a magnetic block with dimensions 40x10x18 mm and a self-weight of 54 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They do not lose strength, even after nearly 10 years – the reduction in power is only ~1% (theoretically),
  • They retain their magnetic properties even under close interference source,
  • In other words, due to the glossy surface of nickel, the element is aesthetically pleasing,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
  • Possibility of accurate forming and modifying to complex needs,
  • Versatile presence in advanced technology sectors – they are utilized in HDD drives, electromotive mechanisms, advanced medical instruments, as well as industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We recommend cover - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments 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 products are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Best holding force of the magnet in ideal parameterswhat contributes to it?

The lifting capacity listed is a measurement result conducted under standard conditions:
  • using a plate made of high-permeability steel, functioning as a ideal flux conductor
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a plane cleaned and smooth
  • with zero gap (without impurities)
  • under vertical force vector (90-degree angle)
  • at standard ambient temperature

Determinants of lifting force in real conditions

Real force impacted by working environment parameters, including (from priority):
  • Clearance – the presence of any layer (rust, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel type – low-carbon steel attracts best. Alloy admixtures decrease magnetic properties and holding force.
  • Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity was assessed with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Handling rules

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

Protective goggles

Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. We recommend safety glasses.

Product not for children

Product intended for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep out of reach of children and animals.

Cards and drives

Do not bring magnets close to a purse, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Avoid contact if allergic

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, cease working with magnets and use protective gear.

Pinching danger

Danger of trauma: The pulling power is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Fire risk

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Precision electronics

Be aware: neodymium magnets produce a field that confuses sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.

Heat warning

Control the heat. Exposing the magnet to high heat will permanently weaken its properties and strength.

Life threat

Patients with a pacemaker must keep an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Caution! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98