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MPL 40x10x4x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020151

GTIN/EAN: 5906301811572

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

9.31 kg / 91.33 N

Magnetic Induction

275.57 mT / 2756 Gs

Coating

[NiCuNi] Nickel

9.21 with VAT / pcs + price for transport

7.49 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 40x10x4x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x4x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020151
GTIN/EAN 5906301811572
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 4 mm [±0,1 mm]
Weight 12 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.31 kg / 91.33 N
Magnetic Induction ~ ? 275.57 mT / 2756 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x4x2[7/3.5] / 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 simulation of the assembly - report

Presented data are the result of a mathematical analysis. Values were calculated on models for the material Nd2Fe14B. Real-world performance might slightly differ. Please consider these data as a reference point when designing systems.

Table 1: Static force (force vs distance) - power drop
MPL 40x10x4x2[7/3.5] / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 2755 Gs
275.5 mT
9.31 kg / 9310.0 g
91.3 N
strong
1 mm 2413 Gs
241.3 mT
7.14 kg / 7143.1 g
70.1 N
strong
2 mm 2044 Gs
204.4 mT
5.13 kg / 5128.9 g
50.3 N
strong
3 mm 1703 Gs
170.3 mT
3.56 kg / 3559.5 g
34.9 N
strong
5 mm 1173 Gs
117.3 mT
1.69 kg / 1688.2 g
16.6 N
low risk
10 mm 522 Gs
52.2 mT
0.33 kg / 334.9 g
3.3 N
low risk
15 mm 277 Gs
27.7 mT
0.09 kg / 94.2 g
0.9 N
low risk
20 mm 163 Gs
16.3 mT
0.03 kg / 32.8 g
0.3 N
low risk
30 mm 69 Gs
6.9 mT
0.01 kg / 5.8 g
0.1 N
low risk
50 mm 19 Gs
1.9 mT
0.00 kg / 0.5 g
0.0 N
low risk

Table 2: Slippage force (vertical surface)
MPL 40x10x4x2[7/3.5] / N38

Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 1.86 kg / 1862.0 g
18.3 N
1 mm Stal (~0.2) 1.43 kg / 1428.0 g
14.0 N
2 mm Stal (~0.2) 1.03 kg / 1026.0 g
10.1 N
3 mm Stal (~0.2) 0.71 kg / 712.0 g
7.0 N
5 mm Stal (~0.2) 0.34 kg / 338.0 g
3.3 N
10 mm Stal (~0.2) 0.07 kg / 66.0 g
0.6 N
15 mm Stal (~0.2) 0.02 kg / 18.0 g
0.2 N
20 mm Stal (~0.2) 0.01 kg / 6.0 g
0.1 N
30 mm Stal (~0.2) 0.00 kg / 2.0 g
0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N

Table 3: Vertical assembly (shearing) - vertical pull
MPL 40x10x4x2[7/3.5] / N38

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.79 kg / 2793.0 g
27.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.86 kg / 1862.0 g
18.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.93 kg / 931.0 g
9.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.66 kg / 4655.0 g
45.7 N

Table 4: Steel thickness (saturation) - power losses
MPL 40x10x4x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.93 kg / 931.0 g
9.1 N
1 mm
25%
2.33 kg / 2327.5 g
22.8 N
2 mm
50%
4.66 kg / 4655.0 g
45.7 N
5 mm
100%
9.31 kg / 9310.0 g
91.3 N
10 mm
100%
9.31 kg / 9310.0 g
91.3 N

Table 5: Thermal stability (stability) - thermal limit
MPL 40x10x4x2[7/3.5] / N38

Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 9.31 kg / 9310.0 g
91.3 N
OK
40 °C -2.2% 9.11 kg / 9105.2 g
89.3 N
OK
60 °C -4.4% 8.90 kg / 8900.4 g
87.3 N
80 °C -6.6% 8.70 kg / 8695.5 g
85.3 N
100 °C -28.8% 6.63 kg / 6628.7 g
65.0 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 40x10x4x2[7/3.5] / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 18.71 kg / 18711 g
183.6 N
4 164 Gs
N/A
1 mm 16.57 kg / 16572 g
162.6 N
5 185 Gs
14.91 kg / 14915 g
146.3 N
~0 Gs
2 mm 14.36 kg / 14356 g
140.8 N
4 826 Gs
12.92 kg / 12920 g
126.7 N
~0 Gs
3 mm 12.24 kg / 12238 g
120.1 N
4 455 Gs
11.01 kg / 11015 g
108.1 N
~0 Gs
5 mm 8.61 kg / 8609 g
84.5 N
3 737 Gs
7.75 kg / 7748 g
76.0 N
~0 Gs
10 mm 3.39 kg / 3393 g
33.3 N
2 346 Gs
3.05 kg / 3054 g
30.0 N
~0 Gs
20 mm 0.67 kg / 673 g
6.6 N
1 045 Gs
0.61 kg / 606 g
5.9 N
~0 Gs
50 mm 0.03 kg / 26 g
0.3 N
207 Gs
0.02 kg / 24 g
0.2 N
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 40x10x4x2[7/3.5] / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Dynamics (kinetic energy) - warning
MPL 40x10x4x2[7/3.5] / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.72 km/h
(7.98 m/s)
0.38 J
30 mm 48.67 km/h
(13.52 m/s)
1.10 J
50 mm 62.82 km/h
(17.45 m/s)
1.83 J
100 mm 88.83 km/h
(24.68 m/s)
3.65 J

Table 9: Coating parameters (durability)
MPL 40x10x4x2[7/3.5] / 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 (Flux)
MPL 40x10x4x2[7/3.5] / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 840 Mx 98.4 µWb
Pc Coefficient 0.26 Low (Flat)

Table 11: Physics of underwater searching
MPL 40x10x4x2[7/3.5] / N38

Environment Effective steel pull Effect
Air (land) 9.31 kg Standard
Water (riverbed) 10.66 kg
(+1.35 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. Wall mount (shear)

*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.

2. Steel saturation

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

3. Thermal stability

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

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
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: 020151-2025
Measurement Calculator
Force (pull)

Field Strength

Other proposals

This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 40x10x4 mm and a weight of 12 g, guarantees premium class connection. This rectangular block with a force of 91.33 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 40x10x4x2[7/3.5] / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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.
They constitute a key element in the production of generators and material handling systems. Thanks to the flat surface and high force (approx. 9.31 kg), they are ideal as closers 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.
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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x10x4x2[7/3.5] / N38 model is magnetized axially (dimension 4 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 40x10x4 mm, which, at a weight of 12 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 40x10x4 mm and a self-weight of 12 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets are characterized by extremely resistant to demagnetization caused by external magnetic fields,
  • In other words, due to the metallic layer of gold, the element is aesthetically pleasing,
  • Neodymium magnets ensure maximum magnetic induction on a their surface, which increases force concentration,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of accurate machining and adapting to individual requirements,
  • Significant place in modern industrial fields – they are utilized in mass storage devices, electric motors, medical devices, and industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 very resistant to heat
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Additionally, tiny parts of these products can complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Lifting parameters

Maximum lifting capacity of the magnetwhat affects it?

Magnet power was determined for optimal configuration, taking into account:
  • on a plate made of mild steel, optimally conducting the magnetic field
  • whose transverse dimension is min. 10 mm
  • with an polished contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

It is worth knowing that the magnet holding may be lower subject to the following factors, starting with the most relevant:
  • Air gap (between the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Hardened steels may attract less.
  • Surface quality – the more even the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Safe distance

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can destroy these devices and wipe information from cards.

Impact on smartphones

An intense magnetic field negatively affects the functioning of compasses in smartphones and navigation systems. Keep magnets close to a smartphone to avoid damaging the sensors.

Implant safety

Life threat: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Respect the power

Exercise caution. Rare earth magnets act from a long distance and snap with massive power, often faster than you can react.

Combustion hazard

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

Bodily injuries

Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Magnets are brittle

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Avoid contact if allergic

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, immediately stop handling magnets and wear gloves.

Maximum temperature

Keep cool. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Do not give to children

Strictly keep magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are life-threatening.

Attention! Details about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98