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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 data - 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 simulation of the assembly - data

Presented data represent the result of a mathematical analysis. Values are based on models for the class Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
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 pounds
73570.0 g / 721.7 N
critical level
1 mm 2778 Gs
277.8 mT
69.55 kg / 153.32 pounds
69546.1 g / 682.2 N
critical level
2 mm 2693 Gs
269.3 mT
65.33 kg / 144.03 pounds
65331.2 g / 640.9 N
critical level
3 mm 2603 Gs
260.3 mT
61.05 kg / 134.59 pounds
61047.5 g / 598.9 N
critical level
5 mm 2415 Gs
241.5 mT
52.56 kg / 115.87 pounds
52559.7 g / 515.6 N
critical level
10 mm 1943 Gs
194.3 mT
34.02 kg / 75.00 pounds
34021.1 g / 333.7 N
critical level
15 mm 1527 Gs
152.7 mT
21.01 kg / 46.31 pounds
21007.7 g / 206.1 N
critical level
20 mm 1192 Gs
119.2 mT
12.81 kg / 28.24 pounds
12808.1 g / 125.6 N
critical level
30 mm 736 Gs
73.6 mT
4.89 kg / 10.77 pounds
4886.6 g / 47.9 N
strong
50 mm 313 Gs
31.3 mT
0.88 kg / 1.95 pounds
884.8 g / 8.7 N
weak grip

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

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

Table 3: Wall mounting (sliding) - 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 pounds
22071.0 g / 216.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
14.71 kg / 32.44 pounds
14714.0 g / 144.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
7.36 kg / 16.22 pounds
7357.0 g / 72.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
36.79 kg / 81.10 pounds
36785.0 g / 360.9 N

Table 4: Steel thickness (substrate influence) - 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 pounds
2452.3 g / 24.1 N
1 mm
8%
6.13 kg / 13.52 pounds
6130.8 g / 60.1 N
2 mm
17%
12.26 kg / 27.03 pounds
12261.7 g / 120.3 N
3 mm
25%
18.39 kg / 40.55 pounds
18392.5 g / 180.4 N
5 mm
42%
30.65 kg / 67.58 pounds
30654.2 g / 300.7 N
10 mm
83%
61.31 kg / 135.16 pounds
61308.3 g / 601.4 N
11 mm
92%
67.44 kg / 148.68 pounds
67439.2 g / 661.6 N
12 mm
100%
73.57 kg / 162.19 pounds
73570.0 g / 721.7 N

Table 5: Thermal stability (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 pounds
73570.0 g / 721.7 N
OK
40 °C -2.2% 71.95 kg / 158.63 pounds
71951.5 g / 705.8 N
OK
60 °C -4.4% 70.33 kg / 155.06 pounds
70332.9 g / 690.0 N
80 °C -6.6% 68.71 kg / 151.49 pounds
68714.4 g / 674.1 N
100 °C -28.8% 52.38 kg / 115.48 pounds
52381.8 g / 513.9 N

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 80x40x15 / N38

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

Table 7: Protective zones (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
Mechanical watch 20 Gs (2.0 mT) 16.0 cm
Mobile device 40 Gs (4.0 mT) 12.5 cm
Remote 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: Dynamics (kinetic energy) - 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

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 (Flux)
MPL 80x40x15 / N38

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

Table 11: Hydrostatics and buoyancy
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains merely ~20% of its max power.

2. Efficiency vs thickness

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

3. Temperature resistance

*For standard magnets, the safety 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
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%
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
Quick Unit Converter
Magnet pull force

Magnetic Induction

Other proposals

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 off-the-shelf 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.
They constitute a key element in the production of wind generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for hanging tools 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.
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.
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 flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
  • They do not lose their magnetic properties even under external field action,
  • A magnet with a shiny silver surface looks better,
  • Neodymium magnets create maximum magnetic induction on a small surface, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Thanks to the option of precise forming and adaptation to unique needs, NdFeB magnets can be created in a broad palette of shapes and sizes, which amplifies use scope,
  • Fundamental importance in future technologies – they serve a role in HDD drives, electric motors, diagnostic systems, also complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Characteristics of disadvantages of neodymium magnets and ways of using them
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest cover - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, including:
  • using a plate made of high-permeability steel, acting as a magnetic yoke
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • characterized by even structure
  • with total lack of distance (no coatings)
  • during pulling in a direction vertical to the plane
  • at room temperature

Lifting capacity in practice – influencing factors

Holding efficiency impacted by specific conditions, mainly (from most important):
  • Clearance – existence of foreign body (rust, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures lower magnetic properties and holding force.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • 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 optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate decreases the holding force.

Safe handling of neodymium magnets
Handling rules

Handle with care. Neodymium magnets attract from a long distance and connect with huge force, often quicker than you can react.

Protect data

Equipment safety: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Allergy Warning

Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop handling magnets and use protective gear.

Impact on smartphones

A strong magnetic field disrupts the functioning of compasses in phones and GPS navigation. Keep magnets near a device to prevent breaking the sensors.

Finger safety

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Material brittleness

Neodymium magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them cracking into shards.

Machining danger

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

Demagnetization risk

Do not overheat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

ICD Warning

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

No play value

NdFeB magnets are not suitable for play. Swallowing multiple magnets can lead to them connecting inside the digestive tract, which constitutes a critical condition and necessitates immediate surgery.

Caution! Looking for details? Read our article: Why are neodymium magnets dangerous?