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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

3.96 ZŁ net + 23% VAT / pcs

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Technical of the product - 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

Engineering analysis of the product - data

The following data constitute the direct effect of a engineering simulation. Results are based on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ. Use these data as a reference point when designing systems.

Table 1: Static pull force (pull vs distance) - power drop
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
 strong
1 mm 2413 Gs
241.3 mT
 7.14 kg / 15.75 lbs
7143.1 g / 70.1 N
 strong
2 mm 2044 Gs
204.4 mT
 5.13 kg / 11.31 lbs
5128.9 g / 50.3 N
 strong
3 mm 1703 Gs
170.3 mT
 3.56 kg / 7.85 lbs
3559.5 g / 34.9 N
 strong
5 mm 1173 Gs
117.3 mT
 1.69 kg / 3.72 lbs
1688.2 g / 16.6 N
 safe
10 mm 522 Gs
52.2 mT
 0.33 kg / 0.74 lbs
334.9 g / 3.3 N
 safe
15 mm 277 Gs
27.7 mT
 0.09 kg / 0.21 lbs
94.2 g / 0.9 N
 safe
20 mm 163 Gs
16.3 mT
 0.03 kg / 0.07 lbs
32.8 g / 0.3 N
 safe
30 mm 69 Gs
6.9 mT
 0.01 kg / 0.01 lbs
5.8 g / 0.1 N
 safe
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 lbs
0.5 g / 0.0 N
 safe
Grip strength drops significantly with every mm of spacing. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) noticeably reduces the pull force. Magnetic products work optimally at the point of direct contact; gap weakens the force. Notice how quickly the pull force drop, when the magnet does not adhere tightly to the metal substrate. When planning the arrangement, eliminate additional spacers.

Table 2: Shear load (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
This section presents the theoretical weight limit necessary to cause the slippage of the magnet downwards against a vertical metal surface (assuming standard friction coefficient). The holding force is relative to the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 element on a upright wall (e.g., a car body), it will maintain just approx. 20%-30% of its nominal power. Gravitational force as well as a weak degree of grip cause that holders move down easier than they pull off. Want to create a wall mount? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will slide down under a noticeably lighter load. Utilizing a rubberized coating can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
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 thin metal plate is not enough to absorb the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To utilize 100% of this neodymium's potential, you require a sufficiently solid piece of metal. The saturation effect causes that on thin elements (e.g., appliance housings), the product holds weaker. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - 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
Classic neodymiums lose power above the temperature limit. Watch out for overheating – heat can permanently damage this product. With increasing heat, the magnet's force briefly lowers. Do not use this magnet in hot environments exceeding its working range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 40x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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 magnets attract each other from a much further distance than a neodymium and metal setup. The setup of magnet-to-magnet produces a massive flux and a further horizon of action. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the collision energy is huge. The repulsion force is a bit weaker than the connection force, but still significant.
*Flux density between like poles reaches ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
* Results show shear force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (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
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
Extremely neodym field poses a real danger to electronic devices and medical implants. These NdFeB products produce a flux that disrupts operation of digital equipment. Remember: the unseen radiation passes through tissues and plastic. Special caution must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - 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
Magnetic elements are delicate – a strong collision with metal can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or injury to skin. Always hold the magnet during installation so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction 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 magnet pole. Key data when building generators as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

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

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.

3. Thermal stability

*For N38 grade, 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
Chemical composition
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%
Ecology and recycling (GPSR)
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
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Component MPL 40x10x4 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 91.33 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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. To separate the MPL 40x10x4 / 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 40x10x4 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 9.31 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 40x10x4 / 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. 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. 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.

Advantages as well as disadvantages of neodymium magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • They maintain their magnetic properties even under strong external field,
  • Thanks to the reflective finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an clean appearance,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Due to the potential of accurate molding and adaptation to unique requirements, neodymium magnets can be produced in a broad palette of forms and dimensions, which makes them more universal,
  • Key role in future technologies – they find application in magnetic memories, brushless drives, precision medical tools, as well as technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets: application proposals
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of producing nuts in the magnet and complex shapes - preferred is cover - mounting mechanism.
  • Health risk to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small components of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Highest magnetic holding force – what contributes to it?

The lifting capacity listed is a theoretical maximum value conducted under the following configuration:
  • with the use of a yoke made of special test steel, guaranteeing maximum field concentration
  • with a thickness no less than 10 mm
  • with an ground contact surface
  • without the slightest clearance between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • in stable room temperature

Magnet lifting force in use – key factors

Bear in mind that the application force may be lower influenced by the following factors, in order of importance:
  • Distance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Steel thickness – insufficiently thick sheet does not close the flux, causing part of the power to be wasted to the other side.
  • Steel grade – the best choice is pure iron steel. Cast iron may attract less.
  • Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the holding force is lower. Additionally, even a small distance between the magnet and the plate reduces the load capacity.

Safety rules for work with neodymium magnets
Avoid contact if allergic

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness occurs, cease handling magnets and use protective gear.

Protect data

Device Safety: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Precision electronics

Be aware: neodymium magnets generate a field that confuses sensitive sensors. Maintain a separation from your phone, device, and GPS.

Do not give to children

Product intended for adults. Small elements pose a choking risk, causing severe trauma. Store out of reach of children and animals.

Do not overheat magnets

Regular neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Flammability

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Beware of splinters

NdFeB magnets are ceramic materials, meaning they are very brittle. Collision of two magnets will cause them shattering into shards.

Serious injuries

Protect your hands. Two large magnets will join instantly with a force of massive weight, destroying everything in their path. Be careful!

Pacemakers

People with a pacemaker have to keep an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Respect the power

Be careful. Neodymium magnets act from a long distance and snap with massive power, often faster than you can move away.

Safety First! Details about hazards in the article: Safety of working with magnets.