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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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Detailed specification - 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 outcome of a physical simulation. Results were calculated on algorithms for the material Nd2Fe14B. Operational parameters may differ from theoretical values. Treat these calculations as a reference point during assembly planning.

Table 1: Static force (force vs gap) - 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 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
strong
50 mm 313 Gs
31.3 mT
0.88 kg / 1.95 lbs
884.8 g / 8.7 N
safe

Table 2: Slippage capacity (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: 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 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 (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) - 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

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 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: 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
Mechanical watch 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) - 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: 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: 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: 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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Warning: On a vertical wall, the magnet retains only ~20% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.

3. Heat tolerance

*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

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
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
Pulling force

Magnetic Field

Other proposals

Model MPL 80x40x15 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. As a block magnet with high power (approx. 73.57 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 80x40x15 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. 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 generators and material handling systems. They work great as invisible mounts 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. 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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. 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.

Pros and cons of Nd2Fe14B magnets.

Pros

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • They retain attractive force for almost 10 years – the loss is just ~1% (based on simulations),
  • They feature excellent resistance to magnetic field loss when exposed to external fields,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnets have excellent magnetic induction on the active area,
  • 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...
  • In view of the potential of flexible shaping and customization to unique solutions, neodymium magnets can be modeled in a wide range of shapes and sizes, which increases their versatility,
  • Universal use in innovative solutions – they are used in HDD drives, drive modules, diagnostic systems, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in compact constructions

Weaknesses

Characteristics of disadvantages of neodymium magnets: application proposals
  • At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their force 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Due to limitations in creating nuts and complex forms in magnets, we recommend using casing - magnetic holder.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Furthermore, small components of these devices can disrupt the diagnostic process medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Lifting parameters

Maximum lifting capacity of the magnetwhat it depends on?

The force parameter is a result of laboratory testing executed under specific, ideal conditions:
  • using a base made of low-carbon steel, serving as a ideal flux conductor
  • possessing a massiveness of at least 10 mm to avoid saturation
  • characterized by lack of roughness
  • under conditions of gap-free contact (metal-to-metal)
  • under vertical force direction (90-degree angle)
  • at ambient temperature room level

Lifting capacity in practice – influencing factors

Effective lifting capacity impacted by working environment parameters, including (from most important):
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. High carbon content worsen the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which improves force. Rough surfaces weaken the grip.
  • Thermal environment – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity was determined with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Nickel coating and allergies

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, cease handling magnets and wear gloves.

Heat warning

Regular neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Magnet fragility

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Health Danger

Patients with a pacemaker must keep an safe separation from magnets. The magnetic field can stop the operation of the life-saving device.

Threat to electronics

Equipment safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Impact on smartphones

Note: neodymium magnets produce a field that interferes with sensitive sensors. Keep a safe distance from your phone, tablet, and navigation systems.

Do not give to children

Product intended for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Store out of reach of kids and pets.

Crushing force

Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Fire warning

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Caution required

Use magnets with awareness. Their powerful strength can surprise even professionals. Be vigilant and respect their force.

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

e-mail: bok@dhit.pl

tel: +48 888 99 98 98