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MPL 80x40x15 / N38 - lamellar magnet

lamellar magnet

Catalog no 020177

GTIN/EAN: 5906301811831

5.00

length

80 mm [±0,1 mm]

Width

40 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

360 g

Magnetization Direction

↑ axial

Load capacity

73.57 kg / 721.75 N

Magnetic Induction

285.78 mT / 2858 Gs

Coating

[NiCuNi] Nickel

139.54 with VAT / pcs + price for transport

113.45 ZŁ net + 23% VAT / pcs

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Technical details - MPL 80x40x15 / N38 - lamellar magnet

Specification / characteristics - MPL 80x40x15 / N38 - lamellar magnet

properties
properties values
Cat. no. 020177
GTIN/EAN 5906301811831
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 80 mm [±0,1 mm]
Width 40 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 360 g
Magnetization Direction ↑ axial
Load capacity ~ ? 73.57 kg / 721.75 N
Magnetic Induction ~ ? 285.78 mT / 2858 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 80x40x15 / 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

Physical modeling of the product - data

The following information are the direct effect of a physical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - power drop
MPL 80x40x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2857 Gs
285.7 mT
73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
critical level
1 mm 2778 Gs
277.8 mT
69.55 kg / 153.32 LBS
69546.1 g / 682.2 N
critical level
2 mm 2693 Gs
269.3 mT
65.33 kg / 144.03 LBS
65331.2 g / 640.9 N
critical level
3 mm 2603 Gs
260.3 mT
61.05 kg / 134.59 LBS
61047.5 g / 598.9 N
critical level
5 mm 2415 Gs
241.5 mT
52.56 kg / 115.87 LBS
52559.7 g / 515.6 N
critical level
10 mm 1943 Gs
194.3 mT
34.02 kg / 75.00 LBS
34021.1 g / 333.7 N
critical level
15 mm 1527 Gs
152.7 mT
21.01 kg / 46.31 LBS
21007.7 g / 206.1 N
critical level
20 mm 1192 Gs
119.2 mT
12.81 kg / 28.24 LBS
12808.1 g / 125.6 N
critical level
30 mm 736 Gs
73.6 mT
4.89 kg / 10.77 LBS
4886.6 g / 47.9 N
warning
50 mm 313 Gs
31.3 mT
0.88 kg / 1.95 LBS
884.8 g / 8.7 N
weak grip

Table 2: Slippage load (wall)
MPL 80x40x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 14.71 kg / 32.44 LBS
14714.0 g / 144.3 N
1 mm Stal (~0.2) 13.91 kg / 30.67 LBS
13910.0 g / 136.5 N
2 mm Stal (~0.2) 13.07 kg / 28.81 LBS
13066.0 g / 128.2 N
3 mm Stal (~0.2) 12.21 kg / 26.92 LBS
12210.0 g / 119.8 N
5 mm Stal (~0.2) 10.51 kg / 23.17 LBS
10512.0 g / 103.1 N
10 mm Stal (~0.2) 6.80 kg / 15.00 LBS
6804.0 g / 66.7 N
15 mm Stal (~0.2) 4.20 kg / 9.26 LBS
4202.0 g / 41.2 N
20 mm Stal (~0.2) 2.56 kg / 5.65 LBS
2562.0 g / 25.1 N
30 mm Stal (~0.2) 0.98 kg / 2.16 LBS
978.0 g / 9.6 N
50 mm Stal (~0.2) 0.18 kg / 0.39 LBS
176.0 g / 1.7 N

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 80x40x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
22.07 kg / 48.66 LBS
22071.0 g / 216.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
14.71 kg / 32.44 LBS
14714.0 g / 144.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
7.36 kg / 16.22 LBS
7357.0 g / 72.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
36.79 kg / 81.10 LBS
36785.0 g / 360.9 N

Table 4: Steel thickness (saturation) - power losses
MPL 80x40x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
2.45 kg / 5.41 LBS
2452.3 g / 24.1 N
1 mm
8%
6.13 kg / 13.52 LBS
6130.8 g / 60.1 N
2 mm
17%
12.26 kg / 27.03 LBS
12261.7 g / 120.3 N
3 mm
25%
18.39 kg / 40.55 LBS
18392.5 g / 180.4 N
5 mm
42%
30.65 kg / 67.58 LBS
30654.2 g / 300.7 N
10 mm
83%
61.31 kg / 135.16 LBS
61308.3 g / 601.4 N
11 mm
92%
67.44 kg / 148.68 LBS
67439.2 g / 661.6 N
12 mm
100%
73.57 kg / 162.19 LBS
73570.0 g / 721.7 N

Table 5: Thermal stability (material behavior) - resistance threshold
MPL 80x40x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
OK
40 °C -2.2% 71.95 kg / 158.63 LBS
71951.5 g / 705.8 N
OK
60 °C -4.4% 70.33 kg / 155.06 LBS
70332.9 g / 690.0 N
80 °C -6.6% 68.71 kg / 151.49 LBS
68714.4 g / 674.1 N
100 °C -28.8% 52.38 kg / 115.48 LBS
52381.8 g / 513.9 N

Table 6: Two magnets (attraction) - forces in the system
MPL 80x40x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 161.08 kg / 355.13 LBS
4 384 Gs
24.16 kg / 53.27 LBS
24163 g / 237.0 N
N/A
1 mm 156.77 kg / 345.63 LBS
5 638 Gs
23.52 kg / 51.84 LBS
23516 g / 230.7 N
141.10 kg / 311.07 LBS
~0 Gs
2 mm 152.27 kg / 335.70 LBS
5 556 Gs
22.84 kg / 50.36 LBS
22841 g / 224.1 N
137.05 kg / 302.13 LBS
~0 Gs
3 mm 147.69 kg / 325.60 LBS
5 472 Gs
22.15 kg / 48.84 LBS
22153 g / 217.3 N
132.92 kg / 293.04 LBS
~0 Gs
5 mm 138.36 kg / 305.04 LBS
5 297 Gs
20.75 kg / 45.76 LBS
20754 g / 203.6 N
124.53 kg / 274.53 LBS
~0 Gs
10 mm 115.08 kg / 253.71 LBS
4 830 Gs
17.26 kg / 38.06 LBS
17262 g / 169.3 N
103.57 kg / 228.34 LBS
~0 Gs
20 mm 74.49 kg / 164.22 LBS
3 886 Gs
11.17 kg / 24.63 LBS
11174 g / 109.6 N
67.04 kg / 147.80 LBS
~0 Gs
50 mm 17.20 kg / 37.91 LBS
1 867 Gs
2.58 kg / 5.69 LBS
2580 g / 25.3 N
15.48 kg / 34.12 LBS
~0 Gs
60 mm 10.70 kg / 23.59 LBS
1 473 Gs
1.60 kg / 3.54 LBS
1605 g / 15.7 N
9.63 kg / 21.23 LBS
~0 Gs
70 mm 6.78 kg / 14.94 LBS
1 172 Gs
1.02 kg / 2.24 LBS
1017 g / 10.0 N
6.10 kg / 13.45 LBS
~0 Gs
80 mm 4.38 kg / 9.65 LBS
942 Gs
0.66 kg / 1.45 LBS
657 g / 6.4 N
3.94 kg / 8.69 LBS
~0 Gs
90 mm 2.89 kg / 6.36 LBS
765 Gs
0.43 kg / 0.95 LBS
433 g / 4.2 N
2.60 kg / 5.72 LBS
~0 Gs
100 mm 1.94 kg / 4.27 LBS
627 Gs
0.29 kg / 0.64 LBS
291 g / 2.9 N
1.74 kg / 3.84 LBS
~0 Gs

Table 7: Safety (HSE) (implants) - warnings
MPL 80x40x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 26.0 cm
Hearing aid 10 Gs (1.0 mT) 20.5 cm
Mechanical watch 20 Gs (2.0 mT) 16.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 12.5 cm
Car key 50 Gs (5.0 mT) 11.5 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm

Table 8: Impact energy (cracking risk) - collision effects
MPL 80x40x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.11 km/h
(5.03 m/s)
4.56 J
30 mm 25.99 km/h
(7.22 m/s)
9.38 J
50 mm 32.48 km/h
(9.02 m/s)
14.65 J
100 mm 45.61 km/h
(12.67 m/s)
28.89 J

Table 9: Corrosion resistance
MPL 80x40x15 / 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 80x40x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 94 833 Mx 948.3 µWb
Pc Coefficient 0.33 Low (Flat)

Table 11: Submerged application
MPL 80x40x15 / N38

Environment Effective steel pull Effect
Air (land) 73.57 kg Standard
Water (riverbed) 84.24 kg
(+10.67 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. Wall mount (shear)

*Note: On a vertical surface, the magnet holds just a fraction of its max power.

2. Steel saturation

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

3. Temperature resistance

*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) = 0.33

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.

Engineering data and GPSR
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%
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: 020177-2026
Measurement Calculator
Pulling force

Magnetic Induction

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Component MPL 80x40x15 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 73.57 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.
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 73.57 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 80x40x15 / 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. 73.57 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. 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.
Standardly, the MPL 80x40x15 / N38 model is magnetized through the thickness (dimension 15 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (80x40 mm), which is ideal for flat mounting. 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: 80 mm (length), 40 mm (width), and 15 mm (thickness). The key parameter here is the holding force amounting to approximately 73.57 kg (force ~721.75 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of rare earth magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They feature excellent resistance to magnetism drop as a result of opposing magnetic fields,
  • A magnet with a smooth gold surface has an effective appearance,
  • The surface of neodymium magnets generates a intense 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 forming as well as adapting to complex applications,
  • Huge importance in innovative solutions – they serve a role in magnetic memories, electric motors, medical devices, also complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

Problematic aspects of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • Neodymium magnets decrease their strength 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 stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We suggest cover - magnetic holder, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these products can be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding forcewhat contributes to it?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:
  • using a base made of mild steel, acting as a ideal flux conductor
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with a surface free of scratches
  • without any clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Lifting capacity in real conditions – factors

During everyday use, the actual holding force depends on several key aspects, listed from crucial:
  • Gap (between the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Surface finish – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

Warnings
Safe distance

Do not bring magnets near a purse, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.

Machining danger

Powder produced during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Magnets are brittle

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Product not for children

Strictly keep magnets away from children. Choking hazard is significant, and the effects of magnets connecting inside the body are fatal.

Warning for heart patients

For implant holders: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.

Handling rules

Handle magnets with awareness. Their immense force can shock even professionals. Plan your moves and respect their force.

GPS and phone interference

A strong magnetic field interferes with the operation of compasses in smartphones and GPS navigation. Maintain magnets close to a device to prevent breaking the sensors.

Nickel allergy

It is widely known that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, refrain from direct skin contact or opt for coated magnets.

Permanent damage

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Physical harm

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

Danger! Learn more about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98