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MPL 40x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020158

GTIN/EAN: 5906301811640

length

40 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

60 g

Magnetization Direction

↑ axial

Load capacity

24.62 kg / 241.53 N

Magnetic Induction

349.60 mT / 3496 Gs

Coating

[NiCuNi] Nickel

31.00 with VAT / pcs + price for transport

25.20 ZŁ net + 23% VAT / pcs

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Technical details - MPL 40x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 40x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020158
GTIN/EAN 5906301811640
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 10 mm [±0,1 mm]
Weight 60 g
Magnetization Direction ↑ axial
Load capacity ~ ? 24.62 kg / 241.53 N
Magnetic Induction ~ ? 349.60 mT / 3496 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x20x10 / 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 assembly - technical parameters

These values constitute the outcome of a mathematical analysis. Values rely on algorithms for the class Nd2Fe14B. Real-world conditions may differ. Use these calculations as a reference point when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MPL 40x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3495 Gs
349.5 mT
24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
dangerous!
1 mm 3272 Gs
327.2 mT
21.58 kg / 47.57 pounds
21578.0 g / 211.7 N
dangerous!
2 mm 3035 Gs
303.5 mT
18.56 kg / 40.92 pounds
18559.3 g / 182.1 N
dangerous!
3 mm 2794 Gs
279.4 mT
15.73 kg / 34.69 pounds
15733.0 g / 154.3 N
dangerous!
5 mm 2332 Gs
233.2 mT
10.96 kg / 24.16 pounds
10959.2 g / 107.5 N
dangerous!
10 mm 1433 Gs
143.3 mT
4.14 kg / 9.12 pounds
4136.4 g / 40.6 N
medium risk
15 mm 891 Gs
89.1 mT
1.60 kg / 3.52 pounds
1598.7 g / 15.7 N
safe
20 mm 574 Gs
57.4 mT
0.66 kg / 1.46 pounds
664.0 g / 6.5 N
safe
30 mm 267 Gs
26.7 mT
0.14 kg / 0.32 pounds
143.7 g / 1.4 N
safe
50 mm 82 Gs
8.2 mT
0.01 kg / 0.03 pounds
13.7 g / 0.1 N
safe

Table 2: Slippage capacity (wall)
MPL 40x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.92 kg / 10.86 pounds
4924.0 g / 48.3 N
1 mm Stal (~0.2) 4.32 kg / 9.52 pounds
4316.0 g / 42.3 N
2 mm Stal (~0.2) 3.71 kg / 8.18 pounds
3712.0 g / 36.4 N
3 mm Stal (~0.2) 3.15 kg / 6.94 pounds
3146.0 g / 30.9 N
5 mm Stal (~0.2) 2.19 kg / 4.83 pounds
2192.0 g / 21.5 N
10 mm Stal (~0.2) 0.83 kg / 1.83 pounds
828.0 g / 8.1 N
15 mm Stal (~0.2) 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
20 mm Stal (~0.2) 0.13 kg / 0.29 pounds
132.0 g / 1.3 N
30 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N

Table 3: Wall mounting (sliding) - vertical pull
MPL 40x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.39 kg / 16.28 pounds
7386.0 g / 72.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.92 kg / 10.86 pounds
4924.0 g / 48.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.46 kg / 5.43 pounds
2462.0 g / 24.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.31 kg / 27.14 pounds
12310.0 g / 120.8 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 40x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.23 kg / 2.71 pounds
1231.0 g / 12.1 N
1 mm
13%
3.08 kg / 6.78 pounds
3077.5 g / 30.2 N
2 mm
25%
6.16 kg / 13.57 pounds
6155.0 g / 60.4 N
3 mm
38%
9.23 kg / 20.35 pounds
9232.5 g / 90.6 N
5 mm
63%
15.39 kg / 33.92 pounds
15387.5 g / 151.0 N
10 mm
100%
24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
11 mm
100%
24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
12 mm
100%
24.62 kg / 54.28 pounds
24620.0 g / 241.5 N

Table 5: Thermal stability (material behavior) - thermal limit
MPL 40x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
OK
40 °C -2.2% 24.08 kg / 53.08 pounds
24078.4 g / 236.2 N
OK
60 °C -4.4% 23.54 kg / 51.89 pounds
23536.7 g / 230.9 N
80 °C -6.6% 23.00 kg / 50.70 pounds
22995.1 g / 225.6 N
100 °C -28.8% 17.53 kg / 38.65 pounds
17529.4 g / 172.0 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 40x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 60.25 kg / 132.83 pounds
4 926 Gs
9.04 kg / 19.93 pounds
9038 g / 88.7 N
N/A
1 mm 56.58 kg / 124.73 pounds
6 774 Gs
8.49 kg / 18.71 pounds
8487 g / 83.3 N
50.92 kg / 112.26 pounds
~0 Gs
2 mm 52.81 kg / 116.42 pounds
6 544 Gs
7.92 kg / 17.46 pounds
7921 g / 77.7 N
47.53 kg / 104.78 pounds
~0 Gs
3 mm 49.07 kg / 108.19 pounds
6 309 Gs
7.36 kg / 16.23 pounds
7361 g / 72.2 N
44.17 kg / 97.37 pounds
~0 Gs
5 mm 41.89 kg / 92.34 pounds
5 828 Gs
6.28 kg / 13.85 pounds
6283 g / 61.6 N
37.70 kg / 83.11 pounds
~0 Gs
10 mm 26.82 kg / 59.13 pounds
4 664 Gs
4.02 kg / 8.87 pounds
4023 g / 39.5 N
24.14 kg / 53.22 pounds
~0 Gs
20 mm 10.12 kg / 22.32 pounds
2 865 Gs
1.52 kg / 3.35 pounds
1518 g / 14.9 N
9.11 kg / 20.09 pounds
~0 Gs
50 mm 0.73 kg / 1.61 pounds
769 Gs
0.11 kg / 0.24 pounds
109 g / 1.1 N
0.66 kg / 1.45 pounds
~0 Gs
60 mm 0.35 kg / 0.78 pounds
534 Gs
0.05 kg / 0.12 pounds
53 g / 0.5 N
0.32 kg / 0.70 pounds
~0 Gs
70 mm 0.18 kg / 0.40 pounds
383 Gs
0.03 kg / 0.06 pounds
27 g / 0.3 N
0.16 kg / 0.36 pounds
~0 Gs
80 mm 0.10 kg / 0.22 pounds
282 Gs
0.01 kg / 0.03 pounds
15 g / 0.1 N
0.09 kg / 0.20 pounds
~0 Gs
90 mm 0.06 kg / 0.12 pounds
214 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
0.05 kg / 0.11 pounds
~0 Gs
100 mm 0.03 kg / 0.07 pounds
165 Gs
0.01 kg / 0.01 pounds
5 g / 0.0 N
0.03 kg / 0.07 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 40x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.5 cm
Hearing aid 10 Gs (1.0 mT) 11.5 cm
Mechanical watch 20 Gs (2.0 mT) 9.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.0 cm
Remote 50 Gs (5.0 mT) 6.5 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm

Table 8: Collisions (kinetic energy) - collision effects
MPL 40x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.47 km/h
(6.24 m/s)
1.17 J
30 mm 35.51 km/h
(9.86 m/s)
2.92 J
50 mm 45.70 km/h
(12.69 m/s)
4.83 J
100 mm 64.60 km/h
(17.95 m/s)
9.66 J

Table 9: Anti-corrosion coating durability
MPL 40x20x10 / 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 (Flux)
MPL 40x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 28 125 Mx 281.2 µWb
Pc Coefficient 0.42 Low (Flat)

Table 11: Submerged application
MPL 40x20x10 / N38

Environment Effective steel pull Effect
Air (land) 24.62 kg Standard
Water (riverbed) 28.19 kg
(+3.57 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

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

3. Thermal stability

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.42

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 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%
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: 020158-2026
Quick Unit Converter
Pulling force

Field Strength

Other offers

Component MPL 40x20x10 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 24.62 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 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 24.62 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 24.62 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. 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 40x20x10 / N38 model is magnetized through the thickness (dimension 10 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 40x20x10 mm, which, at a weight of 60 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 40x20x10 mm and a self-weight of 60 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose power, even during approximately 10 years – the reduction in power is only ~1% (according to tests),
  • They feature excellent resistance to magnetic field loss as a result of external magnetic sources,
  • By covering with a smooth layer of gold, the element acquires an professional look,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of exact modeling and adapting to complex requirements,
  • Fundamental importance in electronics industry – they are used in data components, electric motors, medical equipment, and technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Weaknesses

What to avoid - cons of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • Neodymium magnets lose their force 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 durability 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 magnets in rubber or plastics, which secure oxidation and corrosion.
  • We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these devices can complicate diagnosis medical after entering the body.
  • Due to expensive raw materials, their price is relatively high,

Lifting parameters

Maximum magnetic pulling forcewhat contributes to it?

Information about lifting capacity was defined for ideal contact conditions, including:
  • on a plate made of mild steel, optimally conducting the magnetic field
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • characterized by smoothness
  • with direct contact (no coatings)
  • under vertical force direction (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Effective lifting capacity is influenced by specific conditions, mainly (from priority):
  • Gap between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. High carbon content worsen the attraction effect.
  • Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Warnings
Handling guide

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Finger safety

Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Health Danger

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Impact on smartphones

GPS units and smartphones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Data carriers

Powerful magnetic fields can erase data on payment cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

Magnet fragility

Neodymium magnets are ceramic materials, which means they are very brittle. Collision of two magnets will cause them breaking into shards.

Permanent damage

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Machining danger

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Sensitization to coating

It is widely known that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact and select encased magnets.

No play value

Always store magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are life-threatening.

Warning! 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