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MPL 40x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020160

GTIN/EAN: 5906301811664

5.00

length

40 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

30 g

Magnetization Direction

↑ axial

Load capacity

10.67 kg / 104.63 N

Magnetic Induction

205.27 mT / 2053 Gs

Coating

[NiCuNi] Nickel

12.24 with VAT / pcs + price for transport

9.95 ZŁ net + 23% VAT / pcs

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Technical of the product - MPL 40x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 40x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020160
GTIN/EAN 5906301811664
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 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 30 g
Magnetization Direction ↑ axial
Load capacity ~ ? 10.67 kg / 104.63 N
Magnetic Induction ~ ? 205.27 mT / 2053 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x20x5 / 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 magnet - data

These values constitute the outcome of a mathematical calculation. Values are based on algorithms for the class Nd2Fe14B. Operational performance may differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs gap) - power drop
MPL 40x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 2052 Gs
205.2 mT
10.67 kg / 10670.0 g
104.7 N
crushing
1 mm 1956 Gs
195.6 mT
9.69 kg / 9693.2 g
95.1 N
strong
2 mm 1839 Gs
183.9 mT
8.57 kg / 8570.5 g
84.1 N
strong
3 mm 1711 Gs
171.1 mT
7.41 kg / 7413.1 g
72.7 N
strong
5 mm 1444 Gs
144.4 mT
5.28 kg / 5282.9 g
51.8 N
strong
10 mm 888 Gs
88.8 mT
2.00 kg / 1996.5 g
19.6 N
safe
15 mm 545 Gs
54.5 mT
0.75 kg / 752.0 g
7.4 N
safe
20 mm 346 Gs
34.6 mT
0.30 kg / 302.9 g
3.0 N
safe
30 mm 156 Gs
15.6 mT
0.06 kg / 61.9 g
0.6 N
safe
50 mm 46 Gs
4.6 mT
0.01 kg / 5.4 g
0.1 N
safe

Table 2: Slippage load (vertical surface)
MPL 40x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 2.13 kg / 2134.0 g
20.9 N
1 mm Stal (~0.2) 1.94 kg / 1938.0 g
19.0 N
2 mm Stal (~0.2) 1.71 kg / 1714.0 g
16.8 N
3 mm Stal (~0.2) 1.48 kg / 1482.0 g
14.5 N
5 mm Stal (~0.2) 1.06 kg / 1056.0 g
10.4 N
10 mm Stal (~0.2) 0.40 kg / 400.0 g
3.9 N
15 mm Stal (~0.2) 0.15 kg / 150.0 g
1.5 N
20 mm Stal (~0.2) 0.06 kg / 60.0 g
0.6 N
30 mm Stal (~0.2) 0.01 kg / 12.0 g
0.1 N
50 mm Stal (~0.2) 0.00 kg / 2.0 g
0.0 N

Table 3: Vertical assembly (shearing) - vertical pull
MPL 40x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.20 kg / 3201.0 g
31.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.13 kg / 2134.0 g
20.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.07 kg / 1067.0 g
10.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.34 kg / 5335.0 g
52.3 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 40x20x5 / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
5%
0.53 kg / 533.5 g
5.2 N
1 mm
13%
1.33 kg / 1333.8 g
13.1 N
2 mm
25%
2.67 kg / 2667.5 g
26.2 N
5 mm
63%
6.67 kg / 6668.8 g
65.4 N
10 mm
100%
10.67 kg / 10670.0 g
104.7 N

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 40x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 10.67 kg / 10670.0 g
104.7 N
OK
40 °C -2.2% 10.44 kg / 10435.3 g
102.4 N
OK
60 °C -4.4% 10.20 kg / 10200.5 g
100.1 N
80 °C -6.6% 9.97 kg / 9965.8 g
97.8 N
100 °C -28.8% 7.60 kg / 7597.0 g
74.5 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 40x20x5 / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 20.78 kg / 20775 g
203.8 N
3 495 Gs
N/A
1 mm 19.88 kg / 19880 g
195.0 N
4 015 Gs
17.89 kg / 17892 g
175.5 N
~0 Gs
2 mm 18.87 kg / 18873 g
185.1 N
3 912 Gs
16.99 kg / 16986 g
166.6 N
~0 Gs
3 mm 17.80 kg / 17800 g
174.6 N
3 800 Gs
16.02 kg / 16020 g
157.2 N
~0 Gs
5 mm 15.56 kg / 15558 g
152.6 N
3 552 Gs
14.00 kg / 14002 g
137.4 N
~0 Gs
10 mm 10.29 kg / 10286 g
100.9 N
2 888 Gs
9.26 kg / 9257 g
90.8 N
~0 Gs
20 mm 3.89 kg / 3887 g
38.1 N
1 776 Gs
3.50 kg / 3499 g
34.3 N
~0 Gs
50 mm 0.26 kg / 257 g
2.5 N
456 Gs
0.23 kg / 231 g
2.3 N
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 40x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.5 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Car key 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (cracking risk) - collision effects
MPL 40x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.13 km/h
(5.87 m/s)
0.52 J
30 mm 33.06 km/h
(9.18 m/s)
1.27 J
50 mm 42.54 km/h
(11.82 m/s)
2.09 J
100 mm 60.15 km/h
(16.71 m/s)
4.19 J

Table 9: Surface protection spec
MPL 40x20x5 / 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: Construction data (Pc)
MPL 40x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 18 042 Mx 180.4 µWb
Pc Coefficient 0.23 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 40x20x5 / N38

Environment Effective steel pull Effect
Air (land) 10.67 kg Standard
Water (riverbed) 12.22 kg
(+1.55 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.
1. Shear force

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

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Heat tolerance

*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) = 0.23

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
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%
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: 020160-2025
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Magnet pull force

Magnetic Induction

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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 40x20x5 mm and a weight of 30 g, guarantees premium class connection. As a magnetic bar with high power (approx. 10.67 kg), this product is available immediately from our warehouse in Poland. 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 10.67 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x20x5 / 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. 10.67 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.
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 40x20x5 / N38 model is magnetized through the thickness (dimension 5 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 40x20x5 mm, which, at a weight of 30 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 40x20x5 mm and a self-weight of 30 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of rare earth magnets.

Advantages

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They are resistant to demagnetization induced by external disturbances,
  • Thanks to the metallic finish, the coating of Ni-Cu-Ni, gold, or silver gives an professional appearance,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of individual creating and modifying to precise conditions,
  • Significant place in innovative solutions – they are used in hard drives, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their force 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 durability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these devices can be problematic in diagnostics 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 capacity of the magnetwhat contributes to it?

Holding force of 10.67 kg is a result of laboratory testing executed under the following configuration:
  • on a block made of structural steel, optimally conducting the magnetic flux
  • whose thickness is min. 10 mm
  • with an ground touching surface
  • with total lack of distance (without impurities)
  • under perpendicular application of breakaway force (90-degree angle)
  • in stable room temperature

Practical aspects of lifting capacity – factors

Bear in mind that the magnet holding will differ influenced by elements below, starting with the most relevant:
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
  • Steel thickness – too thin plate does not close the flux, causing part of the power to be lost to the other side.
  • Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Operating temperature – NdFeB sinters 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 tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
Material brittleness

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Impact on smartphones

A strong magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.

Product not for children

These products are not intended for children. Eating several magnets can lead to them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

Pinching danger

Watch your fingers. Two large magnets will join immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Danger to pacemakers

People with a ICD must maintain an absolute distance from magnets. The magnetism can stop the operation of the implant.

Allergy Warning

Medical facts indicate that nickel (standard magnet coating) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands or select encased magnets.

Handling rules

Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Data carriers

Equipment safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).

Fire warning

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

Maximum temperature

Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.

Danger! More info about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98