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MPL 40x40x15 / N38 - lamellar magnet

lamellar magnet

Catalog no 020161

GTIN/EAN: 5906301811671

5.00

length

40 mm [±0,1 mm]

Width

40 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

180 g

Magnetization Direction

↑ axial

Load capacity

46.94 kg / 460.51 N

Magnetic Induction

345.80 mT / 3458 Gs

Coating

[NiCuNi] Nickel

55.37 with VAT / pcs + price for transport

45.02 ZŁ net + 23% VAT / pcs

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Technical data of the product - MPL 40x40x15 / N38 - lamellar magnet

Specification / characteristics - MPL 40x40x15 / N38 - lamellar magnet

properties
properties values
Cat. no. 020161
GTIN/EAN 5906301811671
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 40 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 180 g
Magnetization Direction ↑ axial
Load capacity ~ ? 46.94 kg / 460.51 N
Magnetic Induction ~ ? 345.80 mT / 3458 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x40x15 / 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 simulation of the product - data

Presented information are the outcome of a engineering calculation. Values are based on models for the class Nd2Fe14B. Actual performance may differ. Please consider these data as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - characteristics
MPL 40x40x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3458 Gs
345.8 mT
46.94 kg / 103.48 lbs
46940.0 g / 460.5 N
critical level
1 mm 3333 Gs
333.3 mT
43.62 kg / 96.16 lbs
43616.1 g / 427.9 N
critical level
2 mm 3199 Gs
319.9 mT
40.19 kg / 88.60 lbs
40189.1 g / 394.3 N
critical level
3 mm 3060 Gs
306.0 mT
36.77 kg / 81.06 lbs
36767.3 g / 360.7 N
critical level
5 mm 2773 Gs
277.3 mT
30.19 kg / 66.55 lbs
30187.9 g / 296.1 N
critical level
10 mm 2078 Gs
207.8 mT
16.95 kg / 37.37 lbs
16950.2 g / 166.3 N
critical level
15 mm 1507 Gs
150.7 mT
8.91 kg / 19.65 lbs
8913.7 g / 87.4 N
strong
20 mm 1085 Gs
108.5 mT
4.62 kg / 10.19 lbs
4622.3 g / 45.3 N
strong
30 mm 580 Gs
58.0 mT
1.32 kg / 2.92 lbs
1322.9 g / 13.0 N
weak grip
50 mm 204 Gs
20.4 mT
0.16 kg / 0.36 lbs
164.0 g / 1.6 N
weak grip

Table 2: Vertical capacity (vertical surface)
MPL 40x40x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 9.39 kg / 20.70 lbs
9388.0 g / 92.1 N
1 mm Stal (~0.2) 8.72 kg / 19.23 lbs
8724.0 g / 85.6 N
2 mm Stal (~0.2) 8.04 kg / 17.72 lbs
8038.0 g / 78.9 N
3 mm Stal (~0.2) 7.35 kg / 16.21 lbs
7354.0 g / 72.1 N
5 mm Stal (~0.2) 6.04 kg / 13.31 lbs
6038.0 g / 59.2 N
10 mm Stal (~0.2) 3.39 kg / 7.47 lbs
3390.0 g / 33.3 N
15 mm Stal (~0.2) 1.78 kg / 3.93 lbs
1782.0 g / 17.5 N
20 mm Stal (~0.2) 0.92 kg / 2.04 lbs
924.0 g / 9.1 N
30 mm Stal (~0.2) 0.26 kg / 0.58 lbs
264.0 g / 2.6 N
50 mm Stal (~0.2) 0.03 kg / 0.07 lbs
32.0 g / 0.3 N

Table 3: Wall mounting (shearing) - vertical pull
MPL 40x40x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
14.08 kg / 31.05 lbs
14082.0 g / 138.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
9.39 kg / 20.70 lbs
9388.0 g / 92.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.69 kg / 10.35 lbs
4694.0 g / 46.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
23.47 kg / 51.74 lbs
23470.0 g / 230.2 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 40x40x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
2.35 kg / 5.17 lbs
2347.0 g / 23.0 N
1 mm
13%
5.87 kg / 12.94 lbs
5867.5 g / 57.6 N
2 mm
25%
11.74 kg / 25.87 lbs
11735.0 g / 115.1 N
3 mm
38%
17.60 kg / 38.81 lbs
17602.5 g / 172.7 N
5 mm
63%
29.34 kg / 64.68 lbs
29337.5 g / 287.8 N
10 mm
100%
46.94 kg / 103.48 lbs
46940.0 g / 460.5 N
11 mm
100%
46.94 kg / 103.48 lbs
46940.0 g / 460.5 N
12 mm
100%
46.94 kg / 103.48 lbs
46940.0 g / 460.5 N

Table 5: Working in heat (stability) - thermal limit
MPL 40x40x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 46.94 kg / 103.48 lbs
46940.0 g / 460.5 N
OK
40 °C -2.2% 45.91 kg / 101.21 lbs
45907.3 g / 450.4 N
OK
60 °C -4.4% 44.87 kg / 98.93 lbs
44874.6 g / 440.2 N
80 °C -6.6% 43.84 kg / 96.65 lbs
43842.0 g / 430.1 N
100 °C -28.8% 33.42 kg / 73.68 lbs
33421.3 g / 327.9 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 40x40x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 117.92 kg / 259.97 lbs
4 963 Gs
17.69 kg / 39.00 lbs
17688 g / 173.5 N
N/A
1 mm 113.82 kg / 250.94 lbs
6 794 Gs
17.07 kg / 37.64 lbs
17074 g / 167.5 N
102.44 kg / 225.84 lbs
~0 Gs
2 mm 109.57 kg / 241.57 lbs
6 666 Gs
16.44 kg / 36.23 lbs
16436 g / 161.2 N
98.62 kg / 217.41 lbs
~0 Gs
3 mm 105.28 kg / 232.10 lbs
6 534 Gs
15.79 kg / 34.81 lbs
15792 g / 154.9 N
94.75 kg / 208.89 lbs
~0 Gs
5 mm 96.65 kg / 213.08 lbs
6 261 Gs
14.50 kg / 31.96 lbs
14498 g / 142.2 N
86.99 kg / 191.77 lbs
~0 Gs
10 mm 75.84 kg / 167.19 lbs
5 546 Gs
11.38 kg / 25.08 lbs
11376 g / 111.6 N
68.25 kg / 150.47 lbs
~0 Gs
20 mm 42.58 kg / 93.88 lbs
4 155 Gs
6.39 kg / 14.08 lbs
6387 g / 62.7 N
38.32 kg / 84.49 lbs
~0 Gs
50 mm 6.12 kg / 13.49 lbs
1 575 Gs
0.92 kg / 2.02 lbs
918 g / 9.0 N
5.51 kg / 12.14 lbs
~0 Gs
60 mm 3.32 kg / 7.33 lbs
1 161 Gs
0.50 kg / 1.10 lbs
499 g / 4.9 N
2.99 kg / 6.59 lbs
~0 Gs
70 mm 1.87 kg / 4.12 lbs
871 Gs
0.28 kg / 0.62 lbs
281 g / 2.8 N
1.68 kg / 3.71 lbs
~0 Gs
80 mm 1.09 kg / 2.41 lbs
665 Gs
0.16 kg / 0.36 lbs
164 g / 1.6 N
0.98 kg / 2.17 lbs
~0 Gs
90 mm 0.66 kg / 1.46 lbs
517 Gs
0.10 kg / 0.22 lbs
99 g / 1.0 N
0.59 kg / 1.31 lbs
~0 Gs
100 mm 0.41 kg / 0.91 lbs
409 Gs
0.06 kg / 0.14 lbs
62 g / 0.6 N
0.37 kg / 0.82 lbs
~0 Gs

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 40x40x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 20.5 cm
Hearing aid 10 Gs (1.0 mT) 16.0 cm
Timepiece 20 Gs (2.0 mT) 12.5 cm
Mobile device 40 Gs (4.0 mT) 10.0 cm
Remote 50 Gs (5.0 mT) 9.0 cm
Payment card 400 Gs (40.0 mT) 4.0 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm

Table 8: Collisions (cracking risk) - collision effects
MPL 40x40x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.62 km/h
(5.45 m/s)
2.67 J
30 mm 28.70 km/h
(7.97 m/s)
5.72 J
50 mm 36.50 km/h
(10.14 m/s)
9.25 J
100 mm 51.50 km/h
(14.31 m/s)
18.42 J

Table 9: Corrosion resistance
MPL 40x40x15 / 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 40x40x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 58 107 Mx 581.1 µWb
Pc Coefficient 0.43 Low (Flat)

Table 11: Submerged application
MPL 40x40x15 / N38

Environment Effective steel pull Effect
Air (land) 46.94 kg Standard
Water (riverbed) 53.75 kg
(+6.81 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. Shear force

*Caution: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely 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) = 0.43

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
Material specification
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: 020161-2026
Measurement Calculator
Magnet pull force

Field Strength

Other products

Model MPL 40x40x15 / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. As a block magnet with high power (approx. 46.94 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 40x40x15 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x40x15 / 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.
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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 40x40x15 mm, which, at a weight of 180 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 40x40x15 mm and a self-weight of 180 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 Nd2Fe14B magnets.

Benefits

Apart from their strong holding force, neodymium magnets have these key benefits:
  • They do not lose power, even after nearly 10 years – the reduction in power is only ~1% (according to tests),
  • Neodymium magnets are extremely resistant to magnetic field loss caused by magnetic disturbances,
  • By applying a shiny layer of gold, the element acquires an proper look,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of custom shaping and modifying to concrete applications,
  • Fundamental importance in future technologies – they are used in magnetic memories, electromotive mechanisms, medical devices, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in miniature devices

Limitations

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these devices can complicate diagnosis medical in case of swallowing.
  • Due to expensive raw materials, their price is higher than average,

Holding force characteristics

Best holding force of the magnet in ideal parameterswhat contributes to it?

Breakaway force was determined for optimal configuration, including:
  • with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
  • whose transverse dimension is min. 10 mm
  • with an ideally smooth touching surface
  • without any clearance between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

Bear in mind that the magnet holding will differ influenced by elements below, starting with the most relevant:
  • Distance (betwixt the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Steel thickness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Plate material – mild steel gives the best results. Alloy admixtures reduce magnetic permeability and holding force.
  • Surface finish – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Choking Hazard

Always store magnets away from children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are life-threatening.

Phone sensors

Note: neodymium magnets produce a field that interferes with precision electronics. Keep a separation from your phone, tablet, and navigation systems.

Demagnetization risk

Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Protective goggles

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

Flammability

Powder generated during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

ICD Warning

Warning for patients: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Skin irritation risks

Some people have a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact may cause an allergic reaction. We strongly advise wear safety gloves.

Electronic devices

Do not bring magnets close to a wallet, computer, or TV. The magnetic field can destroy these devices and erase data from cards.

Crushing risk

Big blocks can smash fingers instantly. Under no circumstances put your hand between two attracting surfaces.

Powerful field

Be careful. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can move away.

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