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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 details - 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

Engineering analysis of the product - technical parameters

Presented values constitute the outcome of a engineering analysis. Values rely on algorithms for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Use these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs gap) - power drop
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 pounds
14210.0 g / 139.4 N
dangerous!
1 mm 2635 Gs
263.5 mT
12.04 kg / 26.55 pounds
12041.8 g / 118.1 N
dangerous!
2 mm 2385 Gs
238.5 mT
9.86 kg / 21.74 pounds
9859.1 g / 96.7 N
warning
3 mm 2132 Gs
213.2 mT
7.88 kg / 17.37 pounds
7880.1 g / 77.3 N
warning
5 mm 1670 Gs
167.0 mT
4.84 kg / 10.66 pounds
4837.1 g / 47.5 N
warning
10 mm 903 Gs
90.3 mT
1.41 kg / 3.11 pounds
1412.2 g / 13.9 N
safe
15 mm 520 Gs
52.0 mT
0.47 kg / 1.03 pounds
469.2 g / 4.6 N
safe
20 mm 320 Gs
32.0 mT
0.18 kg / 0.39 pounds
177.7 g / 1.7 N
safe
30 mm 141 Gs
14.1 mT
0.03 kg / 0.08 pounds
34.5 g / 0.3 N
safe
50 mm 41 Gs
4.1 mT
0.00 kg / 0.01 pounds
3.0 g / 0.0 N
safe

Table 2: Slippage force (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 pounds
2842.0 g / 27.9 N
1 mm Stal (~0.2) 2.41 kg / 5.31 pounds
2408.0 g / 23.6 N
2 mm Stal (~0.2) 1.97 kg / 4.35 pounds
1972.0 g / 19.3 N
3 mm Stal (~0.2) 1.58 kg / 3.47 pounds
1576.0 g / 15.5 N
5 mm Stal (~0.2) 0.97 kg / 2.13 pounds
968.0 g / 9.5 N
10 mm Stal (~0.2) 0.28 kg / 0.62 pounds
282.0 g / 2.8 N
15 mm Stal (~0.2) 0.09 kg / 0.21 pounds
94.0 g / 0.9 N
20 mm Stal (~0.2) 0.04 kg / 0.08 pounds
36.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - 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 pounds
4263.0 g / 41.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.84 kg / 6.27 pounds
2842.0 g / 27.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.42 kg / 3.13 pounds
1421.0 g / 13.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.11 kg / 15.66 pounds
7105.0 g / 69.7 N

Table 4: Steel thickness (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 pounds
710.5 g / 7.0 N
1 mm
13%
1.78 kg / 3.92 pounds
1776.3 g / 17.4 N
2 mm
25%
3.55 kg / 7.83 pounds
3552.5 g / 34.9 N
3 mm
38%
5.33 kg / 11.75 pounds
5328.8 g / 52.3 N
5 mm
63%
8.88 kg / 19.58 pounds
8881.3 g / 87.1 N
10 mm
100%
14.21 kg / 31.33 pounds
14210.0 g / 139.4 N
11 mm
100%
14.21 kg / 31.33 pounds
14210.0 g / 139.4 N
12 mm
100%
14.21 kg / 31.33 pounds
14210.0 g / 139.4 N

Table 5: Thermal stability (material behavior) - resistance threshold
MPL 40x15x6 / N38

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

Table 6: Two magnets (repulsion) - field collision
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 pounds
4 334 Gs
4.55 kg / 10.03 pounds
4547 g / 44.6 N
N/A
1 mm 28.06 kg / 61.86 pounds
5 508 Gs
4.21 kg / 9.28 pounds
4209 g / 41.3 N
25.25 kg / 55.67 pounds
~0 Gs
2 mm 25.69 kg / 56.64 pounds
5 271 Gs
3.85 kg / 8.50 pounds
3854 g / 37.8 N
23.12 kg / 50.97 pounds
~0 Gs
3 mm 23.33 kg / 51.43 pounds
5 023 Gs
3.50 kg / 7.71 pounds
3499 g / 34.3 N
21.00 kg / 46.29 pounds
~0 Gs
5 mm 18.85 kg / 41.56 pounds
4 515 Gs
2.83 kg / 6.23 pounds
2828 g / 27.7 N
16.97 kg / 37.40 pounds
~0 Gs
10 mm 10.32 kg / 22.75 pounds
3 341 Gs
1.55 kg / 3.41 pounds
1548 g / 15.2 N
9.29 kg / 20.48 pounds
~0 Gs
20 mm 3.01 kg / 6.64 pounds
1 805 Gs
0.45 kg / 1.00 pounds
452 g / 4.4 N
2.71 kg / 5.98 pounds
~0 Gs
50 mm 0.16 kg / 0.35 pounds
416 Gs
0.02 kg / 0.05 pounds
24 g / 0.2 N
0.14 kg / 0.32 pounds
~0 Gs
60 mm 0.07 kg / 0.16 pounds
282 Gs
0.01 kg / 0.02 pounds
11 g / 0.1 N
0.07 kg / 0.15 pounds
~0 Gs
70 mm 0.04 kg / 0.08 pounds
199 Gs
0.01 kg / 0.01 pounds
5 g / 0.1 N
0.03 kg / 0.07 pounds
~0 Gs
80 mm 0.02 kg / 0.04 pounds
144 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.04 pounds
~0 Gs
90 mm 0.01 kg / 0.02 pounds
108 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.02 pounds
~0 Gs
100 mm 0.01 kg / 0.01 pounds
83 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (electronics) - precautionary measures
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
Remote 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 (kinetic energy) - warning
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: Construction data (Flux)
MPL 40x15x6 / N38

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

Table 11: Physics of underwater searching
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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Caution: On a vertical surface, the magnet retains only a fraction of its max power.

2. Steel saturation

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

3. Thermal stability

*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) = 0.31

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 and environmental data
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: 020155-2026
Measurement Calculator
Pulling force

Field Strength

View more proposals

Component MPL 40x15x6 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. As a block magnet with high power (approx. 14.21 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.
Separating block 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 14.21 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x15x6 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. 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. 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). The key parameter here is the lifting capacity amounting to approximately 14.21 kg (force ~139.45 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of neodymium magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even after approximately ten years – the reduction in power is only ~1% (according to tests),
  • They feature excellent resistance to magnetism drop as a result of external magnetic sources,
  • A magnet with a shiny nickel surface has better aesthetics,
  • The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
  • Thanks to the ability of flexible forming and customization to individualized needs, neodymium magnets can be created in a broad palette of forms and dimensions, which makes them more universal,
  • Wide application in modern industrial fields – they find application in computer drives, electric drive systems, medical equipment, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Limitations

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • 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.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited possibility of producing nuts in the magnet and complicated shapes - recommended is cover - mounting mechanism.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these products can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Magnetic strength at its maximum – what affects it?

Information about lifting capacity is the result of a measurement for optimal configuration, including:
  • with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by even structure
  • without any clearance between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at room temperature

Practical aspects of lifting capacity – factors

Effective lifting capacity is influenced by specific conditions, such as (from most important):
  • Distance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Material composition – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate reduces the load capacity.

Warnings
Electronic devices

Data protection: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

Mechanical processing

Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Eye protection

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Bone fractures

Pinching hazard: The attraction force is so immense that it can cause hematomas, pinching, and even bone fractures. Use thick gloves.

Heat warning

Do not overheat. NdFeB magnets are susceptible to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).

Metal Allergy

Some people have a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching might lead to a rash. We suggest wear safety gloves.

Handling guide

Before use, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Medical interference

For implant holders: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Swallowing risk

Always keep magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are life-threatening.

GPS and phone interference

A strong magnetic field disrupts the functioning of magnetometers in smartphones and navigation systems. Keep magnets close to a device to avoid damaging the sensors.

Safety First! 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