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MPL 40x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020150

GTIN/EAN: 5906301811565

5.00

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

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4.87 ZŁ with VAT / pcs + price for transport

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Technical - MPL 40x10x4 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020150
GTIN/EAN 5906301811565
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 40x10x4 / 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 magnet - report

These values constitute the direct effect of a mathematical calculation. Results were calculated on algorithms for the material Nd2Fe14B. Real-world conditions may differ. Please consider these calculations as a reference point for designers.

Table 1: Static force (force vs gap) - characteristics
MPL 40x10x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2755 Gs
275.5 mT
 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
 warning
1 mm 2413 Gs
241.3 mT
 7.14 kg / 15.75 LBS
7143.1 g / 70.1 N
 warning
2 mm 2044 Gs
204.4 mT
 5.13 kg / 11.31 LBS
5128.9 g / 50.3 N
 warning
3 mm 1703 Gs
170.3 mT
 3.56 kg / 7.85 LBS
3559.5 g / 34.9 N
 warning
5 mm 1173 Gs
117.3 mT
 1.69 kg / 3.72 LBS
1688.2 g / 16.6 N
 weak grip
10 mm 522 Gs
52.2 mT
 0.33 kg / 0.74 LBS
334.9 g / 3.3 N
 weak grip
15 mm 277 Gs
27.7 mT
 0.09 kg / 0.21 LBS
94.2 g / 0.9 N
 weak grip
20 mm 163 Gs
16.3 mT
 0.03 kg / 0.07 LBS
32.8 g / 0.3 N
 weak grip
30 mm 69 Gs
6.9 mT
 0.01 kg / 0.01 LBS
5.8 g / 0.1 N
 weak grip
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 LBS
0.5 g / 0.0 N
 weak grip
Pulling power weakens sharply with every mm of spacing. Note that even the smallest gap (e.g., dirt, varnish, veneer) strongly diminishes the holding power. Magnets work optimally at the point of direct contact; gap nullifies the power. See how flashily the parameters fall, when the product does not touch directly to the steel surface. When planning the assembly, avoid redundant distances.

Table 2: Shear force (vertical surface)
MPL 40x10x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.86 kg / 4.11 LBS
1862.0 g / 18.3 N
1 mm Stal (~0.2) 1.43 kg / 3.15 LBS
1428.0 g / 14.0 N
2 mm Stal (~0.2) 1.03 kg / 2.26 LBS
1026.0 g / 10.1 N
3 mm Stal (~0.2) 0.71 kg / 1.57 LBS
712.0 g / 7.0 N
5 mm Stal (~0.2) 0.34 kg / 0.75 LBS
338.0 g / 3.3 N
10 mm Stal (~0.2) 0.07 kg / 0.15 LBS
66.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 LBS
18.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below defines the estimated shear load necessary to start the sliding of the magnet vertically against a vertical metal surface (considering typical friction coefficient). This value depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 40x10x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.79 kg / 6.16 LBS
2793.0 g / 27.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.86 kg / 4.11 LBS
1862.0 g / 18.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.93 kg / 2.05 LBS
931.0 g / 9.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.66 kg / 10.26 LBS
4655.0 g / 45.7 N
When placing a holder on a vertical plane (e.g., a fridge), it you can count on just about 1/5 of its maximum pull force. Gravity and a low friction coefficient cause that holders slide down easier than they pop off the substrate. Want to create a vertical fastening? Note that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the magnet will give way down under a significantly smaller load. Using a rubber pad can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 40x10x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.93 kg / 2.05 LBS
931.0 g / 9.1 N
1 mm
25%
 2.33 kg / 5.13 LBS
2327.5 g / 22.8 N
2 mm
50%
 4.66 kg / 10.26 LBS
4655.0 g / 45.7 N
3 mm
75%
 6.98 kg / 15.39 LBS
6982.5 g / 68.5 N
5 mm
100%
 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
10 mm
100%
 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
11 mm
100%
 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
12 mm
100%
 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
A too thin steel is not enough to focus the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a weak sheet, the flux will pass right through and the attraction force will be weaker. To utilize 100% of this magnet's power, you need a suitably thick piece of metal. The saturation effect means that on thin elements (e.g., thin profiles), the product shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 5: Working in heat (stability) - resistance threshold
MPL 40x10x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
 OK
40 °C -2.2% 9.11 kg / 20.07 LBS
9105.2 g / 89.3 N
 OK
60 °C -4.4% 8.90 kg / 19.62 LBS
8900.4 g / 87.3 N
80 °C -6.6% 8.70 kg / 19.17 LBS
8695.5 g / 85.3 N
100 °C -28.8% 6.63 kg / 14.61 LBS
6628.7 g / 65.0 N
Ordinary NdFeB products lose strength above the temperature limit. Watch out for overheating – high temperature can irreversibly demagnetize this product. With every degree above norm, the neodymium's force temporarily drops. Do not use this product close to ovens higher than its working range. Too high temperature will lead to permanent loss of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) risk losing magnetic properties sooner than long magnets. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 40x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 18.71 kg / 41.25 LBS
4 164 Gs
2.81 kg / 6.19 LBS
2807 g / 27.5 N
 N/A
1 mm 16.57 kg / 36.53 LBS
5 185 Gs
2.49 kg / 5.48 LBS
2486 g / 24.4 N
 14.91 kg / 32.88 LBS
~0 Gs
2 mm 14.36 kg / 31.65 LBS
4 826 Gs
2.15 kg / 4.75 LBS
2153 g / 21.1 N
 12.92 kg / 28.48 LBS
~0 Gs
3 mm 12.24 kg / 26.98 LBS
4 455 Gs
1.84 kg / 4.05 LBS
1836 g / 18.0 N
 11.01 kg / 24.28 LBS
~0 Gs
5 mm 8.61 kg / 18.98 LBS
3 737 Gs
1.29 kg / 2.85 LBS
1291 g / 12.7 N
 7.75 kg / 17.08 LBS
~0 Gs
10 mm 3.39 kg / 7.48 LBS
2 346 Gs
0.51 kg / 1.12 LBS
509 g / 5.0 N
 3.05 kg / 6.73 LBS
~0 Gs
20 mm 0.67 kg / 1.48 LBS
1 045 Gs
0.10 kg / 0.22 LBS
101 g / 1.0 N
 0.61 kg / 1.34 LBS
~0 Gs
50 mm 0.03 kg / 0.06 LBS
207 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
60 mm 0.01 kg / 0.03 LBS
138 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.02 LBS
~0 Gs
70 mm 0.01 kg / 0.01 LBS
96 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.01 LBS
69 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
51 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
39 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a magnet and steel combination. Such a system of two magnets generates a stronger field and a wider radius of action. Want to build a strong closure? Utilize two neodymiums instead of one magnet and a steel. Remember that when bringing together two magnets, the impact force is huge. The repulsion force is slightly lower than the attraction, but still significant.
*The magnetic induction for N-N configuration reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Calculations show friction force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - precautionary measures
MPL 40x10x4 / 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
Timepiece 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Car key 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
A strong magnetic field is a real danger to IT equipment as well as medical implants. These NdFeB products generate a flux that prevents correct functioning of digital equipment. Notice: the unseen radiation passes through tissues and housings. Exceptional care must be exercised by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MPL 40x10x4 / 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
Neodymium magnets are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can trigger coating fragments or injury to fingers. Be sure to control the product during mounting so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when playing with large magnets.

Table 9: Corrosion resistance
MPL 40x10x4 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MPL 40x10x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 840 Mx 98.4 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 40x10x4 / 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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Shear force

*Caution: On a vertical wall, the magnet holds only a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*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) = 0.26

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.

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%
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: 020150-2026
Measurement Calculator
Magnet pull force
Magnetic Field
Simply complete a single box, to let the calculator calculate everything else automatically.

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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 the highest quality connection. This magnetic block with a force of 91.33 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects 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 9.31 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x10x4 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x10x4 / N38 model is magnetized through the thickness (dimension 4 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.
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.

Advantages as well as disadvantages of rare earth magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • Magnets effectively protect themselves against loss of magnetization caused by ambient magnetic noise,
  • By using a smooth coating of gold, the element gains an aesthetic look,
  • Magnetic induction on the surface of the magnet remains very high,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of precise machining and modifying to atypical conditions,
  • Universal use in innovative solutions – they are used in hard drives, drive modules, diagnostic systems, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in miniature devices

Limitations

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We recommend a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated shapes.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Additionally, small components of these magnets are able to complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Highest magnetic holding force – what contributes to it?

The declared magnet strength concerns the peak performance, recorded under laboratory conditions, namely:
  • using a sheet made of mild steel, functioning as a magnetic yoke
  • whose thickness is min. 10 mm
  • with an ground touching surface
  • with direct contact (no paint)
  • during detachment in a direction perpendicular to the plane
  • in stable room temperature

Determinants of practical lifting force of a magnet

Please note that the application force will differ subject to elements below, starting with the most relevant:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Steel type – mild steel gives the best results. Alloy admixtures lower magnetic properties and holding force.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Crushing risk

Big blocks can break fingers instantly. Never place your hand betwixt two strong magnets.

Swallowing risk

Product intended for adults. Tiny parts can be swallowed, causing intestinal necrosis. Store away from children and animals.

Heat warning

Do not overheat. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Safe distance

Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can destroy these devices and erase data from cards.

Respect the power

Handle magnets consciously. Their immense force can surprise even experienced users. Plan your moves and respect their power.

Warning for heart patients

People with a heart stimulator have to maintain an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Impact on smartphones

An intense magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets close to a device to avoid damaging the sensors.

Nickel allergy

It is widely known that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, prevent direct skin contact and opt for versions in plastic housing.

Magnets are brittle

NdFeB magnets are ceramic materials, which means they are very brittle. Clashing of two magnets leads to them cracking into shards.

Machining danger

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Important! Learn more about risks in the article: Magnet Safety Guide.