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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 specification - 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

Physical modeling of the product - technical parameters

These information represent the outcome of a physical analysis. Results are based on algorithms for the class Nd2Fe14B. Actual parameters may differ. Use these calculations as a reference point during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
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: Sliding 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 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 (shearing) - behavior on slippery surfaces
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: Material efficiency (substrate influence) - power losses
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: Working in heat (material behavior) - power drop
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: Magnet-Magnet interaction (attraction) - 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 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: Protective zones (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
Mobile device 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: Dynamics (kinetic energy) - 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: Corrosion resistance
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

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

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.

3. Temperature resistance

*For N38 grade, the critical 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
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%
Sustainability
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
Quick Unit Converter
Pulling force

Field Strength

Other proposals

Component MPL 40x15x6 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 14.21 kg), this product is available off-the-shelf from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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. 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.
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. 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. 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).
Standardly, the MPL 40x15x6 / N38 model is magnetized through the thickness (dimension 6 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (40x15 mm), which is ideal for flat mounting. 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: 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 protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd2Fe14B magnets.

Advantages

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even after nearly ten years – the decrease in power is only ~1% (according to tests),
  • They retain their magnetic properties even under close interference source,
  • The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to present itself better,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Considering the possibility of accurate forming and adaptation to custom requirements, neodymium magnets can be manufactured in a wide range of forms and dimensions, which amplifies use scope,
  • Key role in high-tech industry – they are utilized in magnetic memories, electric drive systems, precision medical tools, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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 immune to moisture, when using outdoors
  • Limited ability of producing threads in the magnet and complex forms - preferred is cover - magnet mounting.
  • Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to expensive raw materials, their price exceeds standard values,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat affects it?

The load parameter shown represents the maximum value, measured under optimal environment, specifically:
  • with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
  • with a cross-section of at least 10 mm
  • with a surface free of scratches
  • with direct contact (without coatings)
  • during pulling in a direction vertical to the plane
  • in neutral thermal conditions

Magnet lifting force in use – key factors

During everyday use, the actual holding force is determined by many variables, ranked from most significant:
  • Gap (between the magnet and the metal), as even a very small distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be escaped to the other side.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and lifting capacity.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Precautions when working with neodymium magnets
GPS and phone interference

Be aware: rare earth magnets produce a field that confuses sensitive sensors. Keep a separation from your mobile, tablet, and GPS.

Handling rules

Handle magnets consciously. Their huge power can shock even experienced users. Stay alert and respect their force.

Allergy Warning

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness happens, cease working with magnets and wear gloves.

Do not overheat magnets

Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and strength.

Combustion hazard

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Protect data

Equipment safety: Strong magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Adults only

Neodymium magnets are not toys. Eating multiple magnets may result in them attracting across intestines, which constitutes a critical condition and requires immediate surgery.

Pacemakers

People with a heart stimulator should keep an large gap from magnets. The magnetism can stop the operation of the life-saving device.

Pinching danger

Large magnets can smash fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Magnets are brittle

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Impact of two magnets will cause them shattering into shards.

Attention! Want to know more? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98