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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

view technical specifications »

4.87 ZŁ with VAT / pcs + price for transport

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical details - 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 assembly - report

These data constitute the direct effect of a mathematical analysis. Values were calculated on models for the material Nd2Fe14B. Operational parameters may differ. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - interaction chart
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
Magnetic force weakens sharply per each millimeter of spacing. Note that even a microscopic distance (e.g., contamination, paint, dust) significantly diminishes the holding power. Magnetic products hold most effectively in perfect adhesion; distance drastically cuts the force. Observe how flashily the load capacity fall, when the magnet does not adhere directly to the metal substrate. When planning the arrangement, discard redundant distances.

Table 2: Vertical 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
This section shows the estimated holding capacity needed to start the shifting of the magnet downwards on a vertical steel wall (assuming standard friction). The holding force depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - 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 mounting a magnet on a upright plane (e.g., a fridge), it you can count on only approx. 20%-30% of its nominal power. Gravity as well as a low friction coefficient mean that holders move down easier than they pull off. Designing a hanger? Consider that the shear force is much weaker than the maximum static pull force. On a smooth steel, the element will slide down under a noticeably lighter weight. 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 thin sheet is not enough to focus the full magnetic flux, which weakens actual performance of the magnet. If you install a neodymium to a weak sheet, the field will penetrate right through and the holding will be smaller. To utilize the maximum of this neodymium's power, you require a sufficiently solid element of steel. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
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 change their properties parameters above the temperature limit. Watch out for overheating – excessive heat can permanently destroy this magnet. With increasing heat, the neodymium's power temporarily decreases. Avoid using this product in hot environments higher than its working range. Exceeding the critical threshold will lead to destruction of magnetic properties.
*Important note: Temperature resistance is determined by both grade, but also on the magnet's shape. Flat magnets (pancake types) are more susceptible to demagnetization under lower heat stress than long magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field range
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 interact from a wider radius than a magnet and steel combination. The connection of magnet-to-magnet produces a massive flux and a wider radius of performance. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the impact force is massive. The levitation is slightly lower than the connection force, but still large.
*Flux density in repulsion mode drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Attention: Calculations show sliding force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - warnings
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 large risk to electronic devices as well as pacemakers. These magnets generate a flux that destroys function of sensitive medical devices. Remember: the unseen radiation passes through tissues and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
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 prone to chipping – a strong collision with metal can result in shattering. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or painful pinches to skin. Be sure to control the product during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when playing 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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

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 magnet pole. Key data in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Submerged application
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. computer 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.

Technical and environmental data
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%
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
Measurement Calculator
Pulling force
Magnetic Field
Enter data in one of the inputs, and the remaining units change on the fly.

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Component MPL 40x10x4 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. 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.
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 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 filters catching filings 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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
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 40x10x4 / N38 model is magnetized axially (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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 10 mm (width), and 4 mm (thickness). The key parameter here is the holding force amounting to approximately 9.31 kg (force ~91.33 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of rare earth magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for around 10 years – the loss is just ~1% (based on simulations),
  • Neodymium magnets are extremely resistant to demagnetization caused by magnetic disturbances,
  • By applying a smooth layer of nickel, the element acquires an aesthetic look,
  • Magnetic induction on the surface of the magnet is strong,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of exact forming as well as modifying to specific conditions,
  • Huge importance in future technologies – they are commonly used in HDD drives, brushless drives, precision medical tools, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in compact constructions

Cons

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • Neodymium magnets decrease their power 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
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these devices are able to be problematic in diagnostics medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:
  • with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
  • with a thickness minimum 10 mm
  • with an ideally smooth touching surface
  • under conditions of ideal adhesion (surface-to-surface)
  • for force applied at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Lifting capacity in real conditions – factors

Holding efficiency is affected by specific conditions, including (from priority):
  • Distance (betwixt the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
  • Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with neodymium magnets
Fire risk

Dust produced during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Bodily injuries

Pinching hazard: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Life threat

Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Material brittleness

Neodymium magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets will cause them breaking into small pieces.

Electronic devices

Equipment safety: Strong magnets can damage data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Nickel allergy

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, cease handling magnets and wear gloves.

Heat sensitivity

Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.

Respect the power

Handle magnets with awareness. Their powerful strength can surprise even experienced users. Plan your moves and respect their power.

GPS Danger

An intense magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Do not bring magnets near a smartphone to prevent breaking the sensors.

Danger to the youngest

NdFeB magnets are not suitable for play. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires urgent medical intervention.

Important! More info about hazards in the article: Magnet Safety Guide.