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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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Product card - 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 product - technical parameters

Presented information are the result of a engineering calculation. Results are based on models for the class Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these data as a preliminary roadmap during assembly planning.

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

Table 2: Shear hold (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 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) - vertical pull
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: Material efficiency (substrate influence) - 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

Table 5: Working in heat (stability) - 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 (repulsion) - forces in the system
MPL 80x40x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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) - 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
Phone / Smartphone 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: 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

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)

Table 10: Construction 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: 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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

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

2. Steel saturation

*Thin steel (e.g. computer case) severely weakens the holding force.

3. Power loss vs temp

*For N38 material, 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

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
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
Quick Unit Converter
Force (pull)

Magnetic Induction

Other proposals

Component MPL 80x40x15 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 721.75 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.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. 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 magnetic separators 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 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. 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. In practice, this means that this magnet has the greatest attraction force on its main planes (80x40 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 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 protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of neodymium magnets.

Advantages

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • Their power is durable, and after approximately ten years it decreases only by ~1% (theoretically),
  • They retain their magnetic properties even under close interference source,
  • By applying a smooth layer of silver, the element acquires an aesthetic look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in shaping and the capacity to customize to specific needs,
  • Huge importance in high-tech industry – they serve a role in HDD drives, drive modules, advanced medical instruments, also technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Weaknesses

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in realizing threads and complicated shapes in magnets, we propose using cover - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Maximum holding power of the magnet – what contributes to it?

The force parameter is a measurement result executed under the following configuration:
  • using a sheet made of high-permeability steel, serving as a magnetic yoke
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a surface cleaned and smooth
  • under conditions of gap-free contact (surface-to-surface)
  • during pulling in a direction perpendicular to the plane
  • at ambient temperature room level

Key elements affecting lifting force

In real-world applications, the real power is determined by a number of factors, ranked from most significant:
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Plate material – mild steel attracts best. Higher carbon content lower magnetic properties and holding force.
  • Surface finish – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Handling rules

Handle with care. Rare earth magnets act from a distance and connect with huge force, often faster than you can move away.

Adults only

Always store magnets out of reach of children. Choking hazard is high, and the effects of magnets connecting inside the body are life-threatening.

Thermal limits

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. This process is irreversible.

Bone fractures

Large magnets can break fingers instantly. Do not put your hand between two strong magnets.

Dust is flammable

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

Medical implants

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.

Electronic hazard

Powerful magnetic fields can erase data on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Fragile material

Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

GPS Danger

An intense magnetic field negatively affects the operation of compasses in phones and navigation systems. Keep magnets near a smartphone to prevent breaking the sensors.

Nickel coating and allergies

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands and choose versions in plastic housing.

Danger! Need more info? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98