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MPL 40x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020150

GTIN: 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

4.87 with VAT / pcs + price for transport

3.96 ZŁ net + 23% VAT / pcs

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MPL 40x10x4 / N38 - lamellar magnet

Specification / characteristics MPL 40x10x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020150
GTIN 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 T
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 106 °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 modeling of the product - data

These information constitute the outcome of a mathematical calculation. Results rely on algorithms for the material NdFeB. Operational conditions may differ from theoretical values. Please consider these data as a reference point when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MPL 40x10x4 / 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
medium risk
1 mm 2413 Gs
241.3 mT
7.14 kg / 7143.1 g
70.1 N
medium risk
2 mm 2044 Gs
204.4 mT
5.13 kg / 5128.9 g
50.3 N
medium risk
3 mm 1703 Gs
170.3 mT
3.56 kg / 3559.5 g
34.9 N
medium risk
5 mm 1173 Gs
117.3 mT
1.69 kg / 1688.2 g
16.6 N
safe
10 mm 522 Gs
52.2 mT
0.33 kg / 334.9 g
3.3 N
safe
15 mm 277 Gs
27.7 mT
0.09 kg / 94.2 g
0.9 N
safe
20 mm 163 Gs
16.3 mT
0.03 kg / 32.8 g
0.3 N
safe
30 mm 69 Gs
6.9 mT
0.01 kg / 5.8 g
0.1 N
safe
50 mm 19 Gs
1.9 mT
0.00 kg / 0.5 g
0.0 N
safe
Table 2: Slippage Capacity (Vertical Surface)
MPL 40x10x4 / 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: Wall mounting (sliding) - vertical pull
MPL 40x10x4 / 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: Material efficiency (substrate influence) - sheet metal selection
MPL 40x10x4 / 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 (material behavior) - resistance threshold
MPL 40x10x4 / 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 (attraction) - forces in the system
MPL 40x10x4 / 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: Hazards (implants) - 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
Table 8: Dynamics (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
Table 9: Anti-corrosion coating durability
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)
Table 10: Design data (Pc)
MPL 40x10x4 / N38
Parameter Value Jedn. SI / Opis
Strumień (Flux) 9 840 Mx 98.4 µWb
Współczynnik Pc 0.26 Niski (Płaski)
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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Montaż na Ścianie (Ześlizg)

*Uwaga: Na pionowej ścianie magnes utrzyma tylko ok. 20-30% tego co na suficie.

2. Wpływ Grubości Blachy

*Cienka blacha (np. obudowa PC 0.5mm) drastycznie osłabia magnes.

3. Wytrzymałość Temperaturowa

*Dla materiału N38 granica bezpieczeństwa to 80°C.

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Sprawdzone zastosowania dla wymiaru 15x10x2 mm

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Idealny jako element wyzwalający dla czujników Halla oraz kontaktronów w systemach alarmowych. Płaski kształt (2mm) pozwala na ukrycie go w wąskich szczelinach obudowy.

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Meble i Fronty

Używany jako "domykacz" lekkich drzwiczek szafkowych, gdzie standardowe magnesy meblowe są za grube. Wymaga wklejenia w płytkie podfrezowanie.

Check out also products

Model MPL 40x10x4 / N38 features a flat shape and industrial pulling force, making it an ideal 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 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. 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 magnetic separators and linear motors. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 40x10x4 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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.
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 lifting capacity amounting to approximately 9.31 kg (force ~91.33 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

  • They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • In other words, due to the smooth surface of silver, the element gains a professional look,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to freedom in shaping and the capacity to customize to complex applications,
  • Wide application in high-tech industry – they find application in computer drives, electromotive mechanisms, advanced medical instruments, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in compact constructions

Disadvantages of neodymium magnets:

  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • NdFeB 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 as well as 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 corrode. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We recommend a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets can be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Magnetic strength at its maximum – what affects it?

The declared magnet strength concerns the maximum value, recorded under optimal environment, namely:

  • on a base made of structural steel, effectively closing the magnetic flux
  • with a cross-section minimum 10 mm
  • characterized by lack of roughness
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial force vector (90-degree angle)
  • at room temperature

Magnet lifting force in use – key factors

Real force is affected by specific conditions, such as (from most important):

  • Clearance – the presence of foreign body (paint, tape, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. In addition, even a slight gap {between} the magnet’s surface and the plate decreases the lifting capacity.

Pros as well as cons of rare earth magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

  • They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • In other words, due to the smooth surface of silver, the element gains a professional look,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to freedom in shaping and the capacity to customize to complex applications,
  • Wide application in high-tech industry – they find application in computer drives, electromotive mechanisms, advanced medical instruments, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in compact constructions

Disadvantages of neodymium magnets:

  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • NdFeB 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 as well as 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 corrode. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We recommend a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets can be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Magnetic strength at its maximum – what affects it?

The declared magnet strength concerns the maximum value, recorded under optimal environment, namely:

  • on a base made of structural steel, effectively closing the magnetic flux
  • with a cross-section minimum 10 mm
  • characterized by lack of roughness
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial force vector (90-degree angle)
  • at room temperature

Magnet lifting force in use – key factors

Real force is affected by specific conditions, such as (from most important):

  • Clearance – the presence of foreign body (paint, tape, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. In addition, even a slight gap {between} the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets

Magnetic media

Do not bring magnets close to a wallet, laptop, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Do not drill into magnets

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this may cause fire.

ICD Warning

For implant holders: Powerful magnets affect medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.

Protective goggles

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

Nickel coating and allergies

It is widely known that nickel (standard magnet coating) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands or choose coated magnets.

Powerful field

Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Physical harm

Large magnets can smash fingers instantly. Never put your hand between two strong magnets.

Heat warning

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

Keep away from children

Absolutely store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are fatal.

Precision electronics

Be aware: rare earth magnets generate a field that interferes with precision electronics. Maintain a separation from your phone, device, and GPS.

Important!

Want to know more? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98