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MPL 40x15x6 / N38 - lamellar magnet

lamellar magnet

Catalog no 020155

GTIN/EAN: 5906301811619

5.00

length

40 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

6 mm [±0,1 mm]

Weight

27 g

Magnetization Direction

↑ axial

Load capacity

14.21 kg / 139.45 N

Magnetic Induction

286.36 mT / 2864 Gs

Coating

[NiCuNi] Nickel

18.45 with VAT / pcs + price for transport

15.00 ZŁ net + 23% VAT / pcs

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Technical - MPL 40x15x6 / N38 - lamellar magnet

Specification / characteristics - MPL 40x15x6 / N38 - lamellar magnet

properties
properties values
Cat. no. 020155
GTIN/EAN 5906301811619
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 40 mm [±0,1 mm]
Width 15 mm [±0,1 mm]
Height 6 mm [±0,1 mm]
Weight 27 g
Magnetization Direction ↑ axial
Load capacity ~ ? 14.21 kg / 139.45 N
Magnetic Induction ~ ? 286.36 mT / 2864 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x15x6 / 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

Technical modeling of the assembly - technical parameters

These values are the direct effect of a engineering simulation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
MPL 40x15x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2863 Gs
286.3 mT
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
critical level
1 mm 2635 Gs
263.5 mT
12.04 kg / 26.55 lbs
12041.8 g / 118.1 N
critical level
2 mm 2385 Gs
238.5 mT
9.86 kg / 21.74 lbs
9859.1 g / 96.7 N
medium risk
3 mm 2132 Gs
213.2 mT
7.88 kg / 17.37 lbs
7880.1 g / 77.3 N
medium risk
5 mm 1670 Gs
167.0 mT
4.84 kg / 10.66 lbs
4837.1 g / 47.5 N
medium risk
10 mm 903 Gs
90.3 mT
1.41 kg / 3.11 lbs
1412.2 g / 13.9 N
low risk
15 mm 520 Gs
52.0 mT
0.47 kg / 1.03 lbs
469.2 g / 4.6 N
low risk
20 mm 320 Gs
32.0 mT
0.18 kg / 0.39 lbs
177.7 g / 1.7 N
low risk
30 mm 141 Gs
14.1 mT
0.03 kg / 0.08 lbs
34.5 g / 0.3 N
low risk
50 mm 41 Gs
4.1 mT
0.00 kg / 0.01 lbs
3.0 g / 0.0 N
low risk

Table 2: Vertical load (vertical surface)
MPL 40x15x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.84 kg / 6.27 lbs
2842.0 g / 27.9 N
1 mm Stal (~0.2) 2.41 kg / 5.31 lbs
2408.0 g / 23.6 N
2 mm Stal (~0.2) 1.97 kg / 4.35 lbs
1972.0 g / 19.3 N
3 mm Stal (~0.2) 1.58 kg / 3.47 lbs
1576.0 g / 15.5 N
5 mm Stal (~0.2) 0.97 kg / 2.13 lbs
968.0 g / 9.5 N
10 mm Stal (~0.2) 0.28 kg / 0.62 lbs
282.0 g / 2.8 N
15 mm Stal (~0.2) 0.09 kg / 0.21 lbs
94.0 g / 0.9 N
20 mm Stal (~0.2) 0.04 kg / 0.08 lbs
36.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Vertical assembly (shearing) - vertical pull
MPL 40x15x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.26 kg / 9.40 lbs
4263.0 g / 41.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.84 kg / 6.27 lbs
2842.0 g / 27.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.42 kg / 3.13 lbs
1421.0 g / 13.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.11 kg / 15.66 lbs
7105.0 g / 69.7 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 40x15x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.71 kg / 1.57 lbs
710.5 g / 7.0 N
1 mm
13%
1.78 kg / 3.92 lbs
1776.3 g / 17.4 N
2 mm
25%
3.55 kg / 7.83 lbs
3552.5 g / 34.9 N
3 mm
38%
5.33 kg / 11.75 lbs
5328.8 g / 52.3 N
5 mm
63%
8.88 kg / 19.58 lbs
8881.3 g / 87.1 N
10 mm
100%
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
11 mm
100%
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
12 mm
100%
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N

Table 5: Thermal stability (material behavior) - thermal limit
MPL 40x15x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
OK
40 °C -2.2% 13.90 kg / 30.64 lbs
13897.4 g / 136.3 N
OK
60 °C -4.4% 13.58 kg / 29.95 lbs
13584.8 g / 133.3 N
80 °C -6.6% 13.27 kg / 29.26 lbs
13272.1 g / 130.2 N
100 °C -28.8% 10.12 kg / 22.31 lbs
10117.5 g / 99.3 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 40x15x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 30.32 kg / 66.84 lbs
4 334 Gs
4.55 kg / 10.03 lbs
4547 g / 44.6 N
N/A
1 mm 28.06 kg / 61.86 lbs
5 508 Gs
4.21 kg / 9.28 lbs
4209 g / 41.3 N
25.25 kg / 55.67 lbs
~0 Gs
2 mm 25.69 kg / 56.64 lbs
5 271 Gs
3.85 kg / 8.50 lbs
3854 g / 37.8 N
23.12 kg / 50.97 lbs
~0 Gs
3 mm 23.33 kg / 51.43 lbs
5 023 Gs
3.50 kg / 7.71 lbs
3499 g / 34.3 N
21.00 kg / 46.29 lbs
~0 Gs
5 mm 18.85 kg / 41.56 lbs
4 515 Gs
2.83 kg / 6.23 lbs
2828 g / 27.7 N
16.97 kg / 37.40 lbs
~0 Gs
10 mm 10.32 kg / 22.75 lbs
3 341 Gs
1.55 kg / 3.41 lbs
1548 g / 15.2 N
9.29 kg / 20.48 lbs
~0 Gs
20 mm 3.01 kg / 6.64 lbs
1 805 Gs
0.45 kg / 1.00 lbs
452 g / 4.4 N
2.71 kg / 5.98 lbs
~0 Gs
50 mm 0.16 kg / 0.35 lbs
416 Gs
0.02 kg / 0.05 lbs
24 g / 0.2 N
0.14 kg / 0.32 lbs
~0 Gs
60 mm 0.07 kg / 0.16 lbs
282 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
0.07 kg / 0.15 lbs
~0 Gs
70 mm 0.04 kg / 0.08 lbs
199 Gs
0.01 kg / 0.01 lbs
5 g / 0.1 N
0.03 kg / 0.07 lbs
~0 Gs
80 mm 0.02 kg / 0.04 lbs
144 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.04 lbs
~0 Gs
90 mm 0.01 kg / 0.02 lbs
108 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
0.01 kg / 0.02 lbs
~0 Gs
100 mm 0.01 kg / 0.01 lbs
83 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Protective zones (implants) - warnings
MPL 40x15x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.0 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Car key 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (cracking risk) - collision effects
MPL 40x15x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.53 km/h
(6.81 m/s)
0.63 J
30 mm 40.13 km/h
(11.15 m/s)
1.68 J
50 mm 51.74 km/h
(14.37 m/s)
2.79 J
100 mm 73.16 km/h
(20.32 m/s)
5.58 J

Table 9: Anti-corrosion coating durability
MPL 40x15x6 / 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 40x15x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 905 Mx 169.0 µWb
Pc Coefficient 0.31 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 40x15x6 / N38

Environment Effective steel pull Effect
Air (land) 14.21 kg Standard
Water (riverbed) 16.27 kg
(+2.06 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

*Note: On a vertical surface, the magnet holds only ~20% of its max power.

2. Steel saturation

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

3. Power loss vs temp

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.31

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.

Technical specification and ecology
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: 020155-2026
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Magnet pull force

Magnetic Induction

Other deals

Component MPL 40x15x6 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 139.45 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.
The key to success is shifting 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. To separate the MPL 40x15x6 / 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 40x15x6 / 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. 14.21 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 40x15x6 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 40x15x6 / N38 model is magnetized axially (dimension 6 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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 15 mm (width), and 6 mm (thickness). It is a magnetic block with dimensions 40x15x6 mm and a self-weight of 27 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • Their strength is maintained, and after approximately ten years it decreases only by ~1% (theoretically),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • By applying a lustrous coating of nickel, the element has an modern look,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • 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...
  • Due to the potential of free molding and customization to unique needs, magnetic components can be produced in a variety of geometric configurations, which increases their versatility,
  • Wide application in innovative solutions – they are utilized in hard drives, drive modules, advanced medical instruments, also industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Weaknesses

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their power 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 magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using casing - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these products can disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what contributes to it?

The force parameter is a measurement result executed under standard conditions:
  • with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with a surface cleaned and smooth
  • with zero gap (no paint)
  • under axial application of breakaway force (90-degree angle)
  • at temperature room level

Magnet lifting force in use – key factors

Effective lifting capacity is affected by working environment parameters, mainly (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Material composition – not every steel attracts identically. Alloy additives weaken the attraction effect.
  • Surface finish – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet and the plate reduces the load capacity.

Safety rules for work with neodymium magnets
Crushing risk

Big blocks can smash fingers in a fraction of a second. Never place your hand betwixt two strong magnets.

Nickel coating and allergies

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

Fragile material

NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets will cause them cracking into shards.

Data carriers

Data protection: Strong magnets can damage data carriers and sensitive devices (pacemakers, medical aids, timepieces).

Fire warning

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

Permanent damage

Keep cool. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Do not give to children

Adult use only. Small elements can be swallowed, leading to severe trauma. Keep away from kids and pets.

Magnetic interference

An intense magnetic field disrupts the operation of compasses in smartphones and navigation systems. Maintain magnets close to a smartphone to prevent damaging the sensors.

Caution required

Handle magnets consciously. Their huge power can shock even professionals. Stay alert and do not underestimate their force.

Implant safety

Warning for patients: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Danger! Looking for details? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98