Neodymium magnets: strength you're looking for

Looking for huge power in small size? We have in stock complete range of various shapes and sizes. Best choice for domestic applications, workshop and industrial tasks. See products with fast shipping.

check magnet catalog

Magnets for seabed exploration

Begin your hobby related to seabed exploration! Our double-handle grips (F200, F400) provide safety guarantee and immense power. Solid, corrosion-resistant housing and strong lines will perform in rivers and lakes.

choose searching equipment

Industrial magnetic grips mounting

Professional solutions for fixing without drilling. Threaded mounts (M8, M10, M12) guarantee quick improvement of work on warehouses. Perfect for mounting lamps, detectors and banners.

see technical specs

🚚 Order by 14:00 – we'll ship same day!

Dhit sp. z o.o.
Product available Ships tomorrow

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

bulk discounts:

Need more?

price from 1 pcs
25.20 ZŁ
31.00 ZŁ
price from 30 pcs
23.69 ZŁ
29.14 ZŁ
price from 100 pcs
22.18 ZŁ
27.28 ZŁ
Want to talk magnets?

Call us now +48 22 499 98 98 alternatively drop us a message through inquiry form our website.
Force and structure of neodymium magnets can be tested using our our magnetic calculator.

Orders placed before 14:00 will be shipped the same business day.

Product card - 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 simulation of the product - technical parameters

The following values constitute the outcome of a mathematical analysis. Results are based on models for the material Nd2Fe14B. Actual parameters may deviate from the simulation results. Please consider these calculations as a supplementary guide for designers.

Table 1: Static force (force vs gap) - interaction chart
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 lbs
24620.0 g / 241.5 N
crushing
1 mm 3272 Gs
327.2 mT
21.58 kg / 47.57 lbs
21578.0 g / 211.7 N
crushing
2 mm 3035 Gs
303.5 mT
18.56 kg / 40.92 lbs
18559.3 g / 182.1 N
crushing
3 mm 2794 Gs
279.4 mT
15.73 kg / 34.69 lbs
15733.0 g / 154.3 N
crushing
5 mm 2332 Gs
233.2 mT
10.96 kg / 24.16 lbs
10959.2 g / 107.5 N
crushing
10 mm 1433 Gs
143.3 mT
4.14 kg / 9.12 lbs
4136.4 g / 40.6 N
medium risk
15 mm 891 Gs
89.1 mT
1.60 kg / 3.52 lbs
1598.7 g / 15.7 N
weak grip
20 mm 574 Gs
57.4 mT
0.66 kg / 1.46 lbs
664.0 g / 6.5 N
weak grip
30 mm 267 Gs
26.7 mT
0.14 kg / 0.32 lbs
143.7 g / 1.4 N
weak grip
50 mm 82 Gs
8.2 mT
0.01 kg / 0.03 lbs
13.7 g / 0.1 N
weak grip

Table 2: Shear load (wall)
MPL 40x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.92 kg / 10.86 lbs
4924.0 g / 48.3 N
1 mm Stal (~0.2) 4.32 kg / 9.52 lbs
4316.0 g / 42.3 N
2 mm Stal (~0.2) 3.71 kg / 8.18 lbs
3712.0 g / 36.4 N
3 mm Stal (~0.2) 3.15 kg / 6.94 lbs
3146.0 g / 30.9 N
5 mm Stal (~0.2) 2.19 kg / 4.83 lbs
2192.0 g / 21.5 N
10 mm Stal (~0.2) 0.83 kg / 1.83 lbs
828.0 g / 8.1 N
15 mm Stal (~0.2) 0.32 kg / 0.71 lbs
320.0 g / 3.1 N
20 mm Stal (~0.2) 0.13 kg / 0.29 lbs
132.0 g / 1.3 N
30 mm Stal (~0.2) 0.03 kg / 0.06 lbs
28.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
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 lbs
7386.0 g / 72.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.92 kg / 10.86 lbs
4924.0 g / 48.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.46 kg / 5.43 lbs
2462.0 g / 24.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.31 kg / 27.14 lbs
12310.0 g / 120.8 N

Table 4: Material efficiency (saturation) - 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 lbs
1231.0 g / 12.1 N
1 mm
13%
3.08 kg / 6.78 lbs
3077.5 g / 30.2 N
2 mm
25%
6.16 kg / 13.57 lbs
6155.0 g / 60.4 N
3 mm
38%
9.23 kg / 20.35 lbs
9232.5 g / 90.6 N
5 mm
63%
15.39 kg / 33.92 lbs
15387.5 g / 151.0 N
10 mm
100%
24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
11 mm
100%
24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
12 mm
100%
24.62 kg / 54.28 lbs
24620.0 g / 241.5 N

Table 5: Thermal resistance (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 lbs
24620.0 g / 241.5 N
OK
40 °C -2.2% 24.08 kg / 53.08 lbs
24078.4 g / 236.2 N
OK
60 °C -4.4% 23.54 kg / 51.89 lbs
23536.7 g / 230.9 N
80 °C -6.6% 23.00 kg / 50.70 lbs
22995.1 g / 225.6 N
100 °C -28.8% 17.53 kg / 38.65 lbs
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 lbs
4 926 Gs
9.04 kg / 19.93 lbs
9038 g / 88.7 N
N/A
1 mm 56.58 kg / 124.73 lbs
6 774 Gs
8.49 kg / 18.71 lbs
8487 g / 83.3 N
50.92 kg / 112.26 lbs
~0 Gs
2 mm 52.81 kg / 116.42 lbs
6 544 Gs
7.92 kg / 17.46 lbs
7921 g / 77.7 N
47.53 kg / 104.78 lbs
~0 Gs
3 mm 49.07 kg / 108.19 lbs
6 309 Gs
7.36 kg / 16.23 lbs
7361 g / 72.2 N
44.17 kg / 97.37 lbs
~0 Gs
5 mm 41.89 kg / 92.34 lbs
5 828 Gs
6.28 kg / 13.85 lbs
6283 g / 61.6 N
37.70 kg / 83.11 lbs
~0 Gs
10 mm 26.82 kg / 59.13 lbs
4 664 Gs
4.02 kg / 8.87 lbs
4023 g / 39.5 N
24.14 kg / 53.22 lbs
~0 Gs
20 mm 10.12 kg / 22.32 lbs
2 865 Gs
1.52 kg / 3.35 lbs
1518 g / 14.9 N
9.11 kg / 20.09 lbs
~0 Gs
50 mm 0.73 kg / 1.61 lbs
769 Gs
0.11 kg / 0.24 lbs
109 g / 1.1 N
0.66 kg / 1.45 lbs
~0 Gs
60 mm 0.35 kg / 0.78 lbs
534 Gs
0.05 kg / 0.12 lbs
53 g / 0.5 N
0.32 kg / 0.70 lbs
~0 Gs
70 mm 0.18 kg / 0.40 lbs
383 Gs
0.03 kg / 0.06 lbs
27 g / 0.3 N
0.16 kg / 0.36 lbs
~0 Gs
80 mm 0.10 kg / 0.22 lbs
282 Gs
0.01 kg / 0.03 lbs
15 g / 0.1 N
0.09 kg / 0.20 lbs
~0 Gs
90 mm 0.06 kg / 0.12 lbs
214 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
0.05 kg / 0.11 lbs
~0 Gs
100 mm 0.03 kg / 0.07 lbs
165 Gs
0.01 kg / 0.01 lbs
5 g / 0.0 N
0.03 kg / 0.07 lbs
~0 Gs

Table 7: Protective zones (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
Mobile device 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: Dynamics (kinetic energy) - warning
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: Surface protection spec
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: Electrical data (Pc)
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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

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

2. Steel saturation

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

3. Heat tolerance

*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) = 0.42

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%
Sustainability
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
Measurement Calculator
Force (pull)

Magnetic Field

Other deals

Component MPL 40x20x10 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 241.53 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. To separate the MPL 40x20x10 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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 (40x20 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 40x20x10 mm, which, at a weight of 60 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 24.62 kg (force ~241.53 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • Neodymium magnets are characterized by highly resistant to magnetic field loss caused by external magnetic fields,
  • In other words, due to the glossy finish of nickel, the element is aesthetically pleasing,
  • Magnetic induction on the surface of the magnet turns out to be extremely intense,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Considering the ability of precise molding and adaptation to unique needs, neodymium magnets can be produced in a wide range of shapes and sizes, which makes them more universal,
  • Universal use in advanced technology sectors – they are commonly used in computer drives, motor assemblies, diagnostic systems, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in small systems

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its 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 start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in realizing threads and complicated forms in magnets, we propose using casing - magnetic holder.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small elements of these products are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Magnetic strength at its maximum – what it depends on?

Breakaway force was defined for the most favorable conditions, taking into account:
  • with the use of a yoke made of special test steel, ensuring maximum field concentration
  • whose transverse dimension reaches at least 10 mm
  • with a surface perfectly flat
  • without the slightest air gap between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

Bear in mind that the magnet holding will differ depending on elements below, starting with the most relevant:
  • Clearance – existence of foreign body (paint, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Angle of force application – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be escaped into the air.
  • Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate reduces the holding force.

Warnings
Allergic reactions

It is widely known that the nickel plating (the usual finish) is a potent allergen. If you have an allergy, avoid touching magnets with bare hands or choose versions in plastic housing.

Data carriers

Device Safety: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, hearing aids, timepieces).

Choking Hazard

Absolutely keep magnets away from children. Choking hazard is significant, and the consequences of magnets connecting inside the body are very dangerous.

Heat sensitivity

Monitor thermal conditions. Heating the magnet to high heat will destroy its properties and pulling force.

Do not drill into magnets

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Precision electronics

Be aware: neodymium magnets produce a field that confuses precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Magnets are brittle

NdFeB magnets are sintered ceramics, meaning they are very brittle. Collision of two magnets leads to them cracking into shards.

Safe operation

Use magnets consciously. Their huge power can surprise even professionals. Stay alert and respect their power.

Crushing risk

Big blocks can crush fingers instantly. Do not put your hand betwixt two attracting surfaces.

Medical interference

Warning for patients: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Safety First! More info about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98