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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

Engineering simulation of the assembly - report

Presented values are the direct effect of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Use these data as a supplementary guide during assembly planning.

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
medium risk
3 mm 2132 Gs
213.2 mT
7.88 kg / 17.37 pounds
7880.1 g / 77.3 N
medium risk
5 mm 1670 Gs
167.0 mT
4.84 kg / 10.66 pounds
4837.1 g / 47.5 N
medium risk
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 capacity (wall)
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: Wall mounting (sliding) - 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 (saturation) - 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) - 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 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 (repulsion) - field range
MPL 40x15x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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) - 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: 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: Coating parameters (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: Hydrostatics and buoyancy
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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

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

2. Efficiency vs thickness

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

3. Thermal stability

*For standard magnets, the max working temp 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%
Ecology and recycling (GPSR)
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

Magnetic Field

Other offers

This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 40x15x6 mm and a weight of 27 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 14.21 kg), this product is available immediately from our warehouse in Poland. 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. To separate the MPL 40x15x6 / 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. 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. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 40x15x6 / N38, we recommend utilizing 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. 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 40x15x6 / N38 model is magnetized axially (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 holding force amounting to approximately 14.21 kg (force ~139.45 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of Nd2Fe14B magnets.

Advantages

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • Their power is durable, and after approximately ten years it decreases only by ~1% (theoretically),
  • They maintain their magnetic properties even under external field action,
  • Thanks to the glossy finish, the plating of nickel, gold-plated, or silver gives an professional appearance,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Due to the possibility of accurate molding and adaptation to specialized projects, neodymium magnets can be created in a wide range of shapes and sizes, which expands the range of possible applications,
  • Versatile presence in modern industrial fields – they are commonly used in HDD drives, electric motors, precision medical tools, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in miniature devices

Cons

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose their power 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 stability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated shapes.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these devices can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Detachment force of the magnet in optimal conditionswhat it depends on?

Breakaway force was determined for optimal configuration, including:
  • using a base made of low-carbon steel, serving as a circuit closing element
  • with a cross-section minimum 10 mm
  • with an ideally smooth touching surface
  • with zero gap (without coatings)
  • under vertical force vector (90-degree angle)
  • in temp. approx. 20°C

Lifting capacity in real conditions – factors

In practice, the real power is determined by many variables, ranked from crucial:
  • Gap between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Metal type – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Physical harm

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing everything in their path. Be careful!

Magnets are brittle

Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Keep away from children

Only for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Keep out of reach of children and animals.

Magnetic interference

Note: neodymium magnets produce a field that disrupts sensitive sensors. Maintain a separation from your phone, tablet, and GPS.

Permanent damage

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Allergic reactions

Some people have a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Extended handling may cause a rash. We strongly advise use protective gloves.

Combustion hazard

Combustion risk: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

ICD Warning

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Conscious usage

Handle magnets consciously. Their huge power can surprise even professionals. Stay alert and respect their power.

Threat to electronics

Device Safety: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Warning! More info about risks in the article: Safety of working with magnets.