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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 details - 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 modeling of the assembly - data

Presented values are the direct effect of a engineering analysis. Values are based on models for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Treat these data as a preliminary roadmap 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
crushing
1 mm 4664 Gs
466.4 mT
12.46 kg / 27.48 lbs
12464.6 g / 122.3 N
crushing
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
low risk
15 mm 703 Gs
70.3 mT
0.28 kg / 0.62 lbs
282.9 g / 2.8 N
low risk
20 mm 440 Gs
44.0 mT
0.11 kg / 0.24 lbs
111.1 g / 1.1 N
low risk
30 mm 203 Gs
20.3 mT
0.02 kg / 0.05 lbs
23.6 g / 0.2 N
low risk
50 mm 64 Gs
6.4 mT
0.00 kg / 0.01 lbs
2.4 g / 0.0 N
low risk

Table 2: Slippage force (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 (shearing) - vertical pull
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: Material efficiency (saturation) - power losses
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: Magnet-Magnet interaction (attraction) - field range
MPL 40x10x18 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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
Mechanical watch 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: Dynamics (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: Coating parameters (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 (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: Submerged application
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%
Corrosion warning: 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 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. Heat tolerance

*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) = 0.79

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%
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: 020149-2026
Magnet Unit Converter
Pulling force

Field Strength

View also proposals

Model MPL 40x10x18 / 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. 16.72 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.
The key to success is sliding 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 wind generators and material handling systems. Thanks to the flat surface and high force (approx. 16.72 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 40x10x18 / N38, we recommend utilizing 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 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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 10 mm (width), and 18 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 16.72 kg (force ~164.01 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They retain attractive force for almost ten years – the loss is just ~1% (based on simulations),
  • Neodymium magnets are distinguished by remarkably resistant to loss of magnetic properties caused by external interference,
  • A magnet with a smooth nickel surface has better aesthetics,
  • Magnets have maximum magnetic induction on the working surface,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of accurate modeling and modifying to specific applications,
  • Universal use in future technologies – they are utilized in hard drives, electric drive systems, diagnostic systems, and multitasking production systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in realizing threads and complex forms in magnets, we propose using cover - magnetic mount.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small elements of these products can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

Information about lifting capacity was defined for optimal configuration, assuming:
  • using a plate made of mild steel, functioning as a circuit closing element
  • whose transverse dimension equals approx. 10 mm
  • characterized by smoothness
  • with zero gap (without paint)
  • during pulling in a direction vertical to the plane
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

In practice, the actual lifting capacity depends on many variables, ranked from crucial:
  • Clearance – existence of foreign body (rust, tape, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – insufficiently thick steel does not close the flux, causing part of the flux to be wasted to the other side.
  • Steel type – low-carbon steel attracts best. Higher carbon content reduce magnetic permeability and lifting capacity.
  • Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the load capacity.

Safe handling of neodymium magnets
Electronic hazard

Avoid bringing magnets near a purse, laptop, or screen. The magnetism can permanently damage these devices and erase data from cards.

Life threat

Warning for patients: Strong magnetic fields disrupt medical devices. Keep at least 30 cm distance or request help to handle the magnets.

Fire risk

Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

This is not a toy

Strictly store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are life-threatening.

Conscious usage

Handle magnets consciously. Their huge power can shock even experienced users. Plan your moves and do not underestimate their power.

Precision electronics

GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Bone fractures

Pinching hazard: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Permanent damage

Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, immediately stop handling magnets and wear gloves.

Magnet fragility

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Warning! Learn more about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98