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MPL 40x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020152

GTIN/EAN: 5906301811589

5.00

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

15 g

Magnetization Direction

↑ axial

Load capacity

11.85 kg / 116.27 N

Magnetic Induction

321.37 mT / 3214 Gs

Coating

[NiCuNi] Nickel

technical specifications »

6.03 ZŁ with VAT / pcs + price for transport

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Technical details - MPL 40x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020152
GTIN/EAN 5906301811589
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 5 mm [±0,1 mm]
Weight 15 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.85 kg / 116.27 N
Magnetic Induction ~ ? 321.37 mT / 3214 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x5 / 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

Technical analysis of the product - technical parameters

The following information are the outcome of a mathematical calculation. Values rely on algorithms for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Use these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MPL 40x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3212 Gs
321.2 mT
 11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
 crushing
1 mm 2791 Gs
279.1 mT
 8.95 kg / 19.73 lbs
8947.7 g / 87.8 N
 strong
2 mm 2358 Gs
235.8 mT
 6.38 kg / 14.08 lbs
6384.9 g / 62.6 N
 strong
3 mm 1965 Gs
196.5 mT
 4.43 kg / 9.77 lbs
4432.4 g / 43.5 N
 strong
5 mm 1360 Gs
136.0 mT
 2.12 kg / 4.68 lbs
2122.9 g / 20.8 N
 strong
10 mm 615 Gs
61.5 mT
 0.43 kg / 0.96 lbs
434.1 g / 4.3 N
 low risk
15 mm 329 Gs
32.9 mT
 0.12 kg / 0.27 lbs
124.5 g / 1.2 N
 low risk
20 mm 195 Gs
19.5 mT
 0.04 kg / 0.10 lbs
43.9 g / 0.4 N
 low risk
30 mm 83 Gs
8.3 mT
 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
 low risk
50 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 lbs
0.6 g / 0.0 N
 low risk
Grip strength weakens drastically per each millimeter of gap. Keep in mind that every additional insulation layer (e.g., contamination, varnish, rust) significantly reduces the pull force. Neodymiums operate most effectively during direct contact; air break drastically cuts the power. Notice how flashily the pull force fall, when the product does not touch flatly to the metal substrate. When planning the arrangement, discard unnecessary gaps.

Table 2: Slippage hold (wall)
MPL 40x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.37 kg / 5.22 lbs
2370.0 g / 23.2 N
1 mm Stal (~0.2) 1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
2 mm Stal (~0.2) 1.28 kg / 2.81 lbs
1276.0 g / 12.5 N
3 mm Stal (~0.2) 0.89 kg / 1.95 lbs
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.42 kg / 0.93 lbs
424.0 g / 4.2 N
10 mm Stal (~0.2) 0.09 kg / 0.19 lbs
86.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 lbs
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 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 following data defines the theoretical holding capacity sufficient to initiate the sliding of the magnet downwards against a vertical steel wall (assuming standard friction coefficient). This parameter is a function of the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 40x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.55 kg / 7.84 lbs
3555.0 g / 34.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.37 kg / 5.22 lbs
2370.0 g / 23.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.19 kg / 2.61 lbs
1185.0 g / 11.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.93 kg / 13.06 lbs
5925.0 g / 58.1 N
When mounting a holder on a vertical plane (e.g., a car body), it will maintain barely approx. 1/5 of its nominal power. Gravitational force as well as a low friction coefficient cause that magnets slip easier than they pop off the substrate. Want to create a vertical fastening? Remember that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the magnet will slide down under a significantly smaller load. Utilizing a rubberized pad can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 40x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.59 kg / 1.31 lbs
592.5 g / 5.8 N
1 mm
13%
 1.48 kg / 3.27 lbs
1481.3 g / 14.5 N
2 mm
25%
 2.96 kg / 6.53 lbs
2962.5 g / 29.1 N
3 mm
38%
 4.44 kg / 9.80 lbs
4443.8 g / 43.6 N
5 mm
63%
 7.41 kg / 16.33 lbs
7406.3 g / 72.7 N
10 mm
100%
 11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
11 mm
100%
 11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
12 mm
100%
 11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
A thin metal plate is incapable of conduct the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a weak sheet, the flux will pass right through and the attraction force will be weaker. To utilize the maximum of this neodymium's power, you need a suitably thick piece of metal. The material oversaturation means that on thin elements (e.g., thin profiles), the holder shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Working in heat (stability) - resistance threshold
MPL 40x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
 OK
40 °C -2.2% 11.59 kg / 25.55 lbs
11589.3 g / 113.7 N
 OK
60 °C -4.4% 11.33 kg / 24.98 lbs
11328.6 g / 111.1 N
80 °C -6.6% 11.07 kg / 24.40 lbs
11067.9 g / 108.6 N
100 °C -28.8% 8.44 kg / 18.60 lbs
8437.2 g / 82.8 N
Ordinary NdFeB products lose parameters above the temperature limit. Watch out for overheating – excessive heat can irreversibly damage this magnet. As the temperature rises, the neodymium's power momentarily decreases. Avoid using this product in hot environments higher than its working range. Ignoring the limit will result in permanent loss of magnetism.
*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MPL 40x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 25.44 kg / 56.10 lbs
4 569 Gs
3.82 kg / 8.41 lbs
3817 g / 37.4 N
 N/A
1 mm 22.33 kg / 49.22 lbs
6 018 Gs
3.35 kg / 7.38 lbs
3349 g / 32.9 N
 20.09 kg / 44.30 lbs
~0 Gs
2 mm 19.21 kg / 42.36 lbs
5 582 Gs
2.88 kg / 6.35 lbs
2882 g / 28.3 N
 17.29 kg / 38.12 lbs
~0 Gs
3 mm 16.31 kg / 35.96 lbs
5 144 Gs
2.45 kg / 5.39 lbs
2447 g / 24.0 N
 14.68 kg / 32.36 lbs
~0 Gs
5 mm 11.45 kg / 25.23 lbs
4 309 Gs
1.72 kg / 3.78 lbs
1717 g / 16.8 N
 10.30 kg / 22.71 lbs
~0 Gs
10 mm 4.56 kg / 10.05 lbs
2 719 Gs
0.68 kg / 1.51 lbs
684 g / 6.7 N
 4.10 kg / 9.04 lbs
~0 Gs
20 mm 0.93 kg / 2.05 lbs
1 230 Gs
0.14 kg / 0.31 lbs
140 g / 1.4 N
 0.84 kg / 1.85 lbs
~0 Gs
50 mm 0.04 kg / 0.08 lbs
249 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.03 kg / 0.08 lbs
~0 Gs
60 mm 0.02 kg / 0.04 lbs
167 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.03 lbs
~0 Gs
70 mm 0.01 kg / 0.02 lbs
116 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
84 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.01 lbs
62 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
48 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 sheet setup. The setup of magnet-to-magnet generates a stronger field and a further horizon of action. Want to build a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The levitation is a bit weaker than the attraction, but still large.
*Flux density in repulsion mode reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
* Figures refer to friction force of dual same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - warnings
MPL 40x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Timepiece 20 Gs (2.0 mT) 5.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.5 cm
Car key 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field is a serious hazard to IT equipment and medical implants. These NdFeB products generate a field that disrupts operation of digital equipment. Remember: the unseen radiation passes through tissues and glass. Special caution must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MPL 40x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.99 km/h
(8.05 m/s)
 0.49 J
30 mm 49.12 km/h
(13.64 m/s)
 1.40 J
50 mm 63.39 km/h
(17.61 m/s)
 2.33 J
100 mm 89.64 km/h
(24.90 m/s)
 4.65 J
Neodymium magnets are prone to chipping – a collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the magnet. Wear safety glasses when working with large magnets.

Table 9: Coating parameters (durability)
MPL 40x10x5 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MPL 40x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 11 419 Mx 114.2 µWb
Pc Coefficient 0.31 Low (Flat)
Total magnetic flux emitted by the magnet pole. Key data in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
MPL 40x10x5 / N38

Environment Effective steel pull Effect
Air (land) 11.85 kg Standard
Water (riverbed) 13.57 kg
(+1.72 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Note: On a vertical wall, the magnet retains merely a fraction of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Power loss vs temp

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.31

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
Elemental analysis
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: 020152-2026
Measurement Calculator
Magnet pull force
Magnetic Field
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Component MPL 40x10x5 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 116.27 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 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 11.85 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x10x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as invisible mounts under tiles, wood, or glass. 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).
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 5 mm (thickness). The key parameter here is the holding force amounting to approximately 11.85 kg (force ~116.27 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of neodymium magnets.

Benefits

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • They retain magnetic properties for around ten years – the drop is just ~1% (according to analyses),
  • They possess excellent resistance to magnetic field loss due to opposing magnetic fields,
  • In other words, due to the shiny finish of gold, the element gains a professional look,
  • Magnetic induction on the top side of the magnet turns out to be maximum,
  • 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 detailed forming as well as adapting to defined needs,
  • Versatile presence in modern technologies – they are used in computer drives, brushless drives, diagnostic systems, also complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing nuts and complex shapes in magnets, we recommend using casing - magnetic mount.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these products can complicate diagnosis medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting force for a neodymium magnet – what contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:
  • using a base made of low-carbon steel, functioning as a circuit closing element
  • with a thickness no less than 10 mm
  • characterized by smoothness
  • under conditions of ideal adhesion (surface-to-surface)
  • under perpendicular application of breakaway force (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

In real-world applications, the real power is determined by many variables, listed from the most important:
  • Distance (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, corrosion or debris).
  • Angle of force application – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
  • Surface finish – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot 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 a perpendicular force was applied, in contrast under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safe handling of neodymium magnets
Hand protection

Pinching hazard: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Beware of splinters

Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Implant safety

Individuals with a ICD should maintain an large gap from magnets. The magnetic field can disrupt the operation of the implant.

Demagnetization risk

Control the heat. Heating the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Dust explosion hazard

Dust produced during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Sensitization to coating

It is widely known that nickel (the usual finish) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands and select versions in plastic housing.

Product not for children

Absolutely keep magnets away from children. Choking hazard is high, and the effects of magnets clamping inside the body are fatal.

Compass and GPS

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Data carriers

Do not bring magnets close to a purse, computer, or screen. The magnetism can permanently damage these devices and erase data from cards.

Handling rules

Use magnets with awareness. Their immense force can shock even professionals. Plan your moves and respect their power.

Attention! More info about hazards in the article: Safety of working with magnets.