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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

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139.54 ZŁ 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

Engineering analysis of the assembly - technical parameters

The following information constitute the direct effect of a engineering simulation. Values rely on models for the class Nd2Fe14B. Real-world parameters may differ. Use these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - interaction chart
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
 dangerous!
1 mm 2778 Gs
277.8 mT
 69.55 kg / 153.32 lbs
69546.1 g / 682.2 N
 dangerous!
2 mm 2693 Gs
269.3 mT
 65.33 kg / 144.03 lbs
65331.2 g / 640.9 N
 dangerous!
3 mm 2603 Gs
260.3 mT
 61.05 kg / 134.59 lbs
61047.5 g / 598.9 N
 dangerous!
5 mm 2415 Gs
241.5 mT
 52.56 kg / 115.87 lbs
52559.7 g / 515.6 N
 dangerous!
10 mm 1943 Gs
194.3 mT
 34.02 kg / 75.00 lbs
34021.1 g / 333.7 N
 dangerous!
15 mm 1527 Gs
152.7 mT
 21.01 kg / 46.31 lbs
21007.7 g / 206.1 N
 dangerous!
20 mm 1192 Gs
119.2 mT
 12.81 kg / 28.24 lbs
12808.1 g / 125.6 N
 dangerous!
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
 safe
Magnetic force decreases drastically with every subsequent millimeter of distance. Note that even a very thin break (e.g., contamination, varnish, veneer) significantly reduces the pull force. Magnetic products operate optimally during direct contact; gap drastically cuts the power. Notice how flashily the pull force drop, when the magnet does not adhere directly to the metal substrate. When planning the assembly, discard additional spacers.

Table 2: Vertical hold (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
The table below presents the theoretical holding capacity necessary to initiate the shifting of the magnet vertically along a vertical metal surface (considering typical friction). This value depends on the separation distance between the magnet and the surface.

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
When hanging a element on a vertical wall (e.g., a board), it will only hold only approx. 20%-30% of its nominal power. Gravitational force as well as a low friction coefficient mean that products slip easier than they detach. Want to create a hanger? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the holder will give way down under a much lighter cargo. Using a rubber pad can significantly improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
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
A thin sheet cannot take in the full magnetic flux, which wastes potential of the magnet. If you install a neodymium to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To utilize full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The material oversaturation causes that on thin elements (e.g., thin profiles), the holder holds weaker. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (stability) - thermal limit
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
Standard neodymium magnets change their properties strength above the temperature limit. Protect against heat – heat can permanently destroy this magnet. As the temperature rises, the magnet's capacity momentarily decreases. Refrain from using this product close to heaters exceeding its working range. Too high temperature will cause permanent loss of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) may lose charge permanently under lower heat stress than taller cylinders. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 80x40x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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
Two magnets attract each other from a significantly greater distance than a magnet and sheet combination. The setup of two magnets produces a massive flux and a larger range of operation. Planning to create a solid fastener? Apply two magnets instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the impact force is massive. The levitation is a bit weaker than the attraction, but still large.
*Flux density between like poles is approximately ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Note: Estimates demonstrate sliding force of two identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 16.0 cm
Mobile device 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
A strong magnetic field is a real danger to electronic devices and medical implants. These magnets produce a flux that disrupts operation of digital equipment. Be aware: the invisible magnetic field penetrates the body and glass. Exceptional care must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
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
NdFeB products are prone to chipping – a collision with steel risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or injury to skin. Always hold the magnet during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when handling with large magnets.

Table 9: Anti-corrosion coating durability
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

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)
Total magnetic flux passing through the pole surface. Key data for generator designers and motors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Warning: On a vertical surface, the magnet retains only 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 critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.33

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.

Engineering data and GPSR
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: 020177-2026
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 80x40x15 mm and a weight of 360 g, guarantees premium class connection. As a block magnet with high power (approx. 73.57 kg), this product is available immediately from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 80x40x15 / 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.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 73.57 kg), they are ideal as closers 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. 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 80x40x15 / N38 model is magnetized axially (dimension 15 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 80x40x15 mm, which, at a weight of 360 g, makes it an element with high energy density. It is a magnetic block with dimensions 80x40x15 mm and a self-weight of 360 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of rare earth magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They do not lose strength, even during approximately 10 years – the reduction in power is only ~1% (based on measurements),
  • Magnets effectively defend themselves against demagnetization caused by external fields,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to look better,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to versatility in constructing and the capacity to customize to specific needs,
  • Significant place in electronics industry – they are used in hard drives, brushless drives, diagnostic systems, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in miniature devices

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in creating nuts and complex shapes in magnets, we propose using casing - magnetic mechanism.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these products can complicate diagnosis medical after entering the body.
  • Due to complex production process, their price is relatively high,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

The specified lifting capacity represents the peak performance, recorded under ideal test conditions, specifically:
  • using a plate made of mild steel, acting as a circuit closing element
  • whose thickness is min. 10 mm
  • with a plane cleaned and smooth
  • with direct contact (no coatings)
  • during detachment in a direction perpendicular to the mounting surface
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

Bear in mind that the application force will differ subject to the following factors, starting with the most relevant:
  • Gap (between the magnet and the plate), as even a very small distance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be escaped to the other side.
  • Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
  • Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Safe handling of neodymium magnets
This is not a toy

Strictly keep magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are life-threatening.

Machining danger

Mechanical processing of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Protect data

Avoid bringing magnets near a wallet, laptop, or TV. The magnetic field can destroy these devices and wipe information from cards.

Beware of splinters

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

Bodily injuries

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing everything in their path. Be careful!

Medical implants

People with a ICD should keep an large gap from magnets. The magnetic field can interfere with the operation of the life-saving device.

Conscious usage

Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Demagnetization risk

Monitor thermal conditions. Heating the magnet to high heat will ruin its magnetic structure and pulling force.

Threat to navigation

An intense magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Keep magnets near a device to avoid damaging the sensors.

Warning for allergy sufferers

Certain individuals experience a sensitization to Ni, which is the common plating for neodymium magnets. Prolonged contact can result in an allergic reaction. It is best to use safety gloves.

Important! More info about hazards in the article: Magnet Safety Guide.