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MPL 40x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020150

GTIN/EAN: 5906301811565

5.00

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

9.31 kg / 91.33 N

Magnetic Induction

275.57 mT / 2756 Gs

Coating

[NiCuNi] Nickel

4.87 with VAT / pcs + price for transport

3.96 ZŁ net + 23% VAT / pcs

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Technical data - MPL 40x10x4 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020150
GTIN/EAN 5906301811565
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 10 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 12 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.31 kg / 91.33 N
Magnetic Induction ~ ? 275.57 mT / 2756 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x4 / 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 analysis of the product - technical parameters

These data are the direct effect of a physical calculation. Values were calculated on algorithms for the class Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Use these data as a supplementary guide for designers.

Table 1: Static pull force (force vs gap) - interaction chart
MPL 40x10x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2755 Gs
275.5 mT
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
strong
1 mm 2413 Gs
241.3 mT
7.14 kg / 15.75 pounds
7143.1 g / 70.1 N
strong
2 mm 2044 Gs
204.4 mT
5.13 kg / 11.31 pounds
5128.9 g / 50.3 N
strong
3 mm 1703 Gs
170.3 mT
3.56 kg / 7.85 pounds
3559.5 g / 34.9 N
strong
5 mm 1173 Gs
117.3 mT
1.69 kg / 3.72 pounds
1688.2 g / 16.6 N
safe
10 mm 522 Gs
52.2 mT
0.33 kg / 0.74 pounds
334.9 g / 3.3 N
safe
15 mm 277 Gs
27.7 mT
0.09 kg / 0.21 pounds
94.2 g / 0.9 N
safe
20 mm 163 Gs
16.3 mT
0.03 kg / 0.07 pounds
32.8 g / 0.3 N
safe
30 mm 69 Gs
6.9 mT
0.01 kg / 0.01 pounds
5.8 g / 0.1 N
safe
50 mm 19 Gs
1.9 mT
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
safe

Table 2: Shear force (wall)
MPL 40x10x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.86 kg / 4.11 pounds
1862.0 g / 18.3 N
1 mm Stal (~0.2) 1.43 kg / 3.15 pounds
1428.0 g / 14.0 N
2 mm Stal (~0.2) 1.03 kg / 2.26 pounds
1026.0 g / 10.1 N
3 mm Stal (~0.2) 0.71 kg / 1.57 pounds
712.0 g / 7.0 N
5 mm Stal (~0.2) 0.34 kg / 0.75 pounds
338.0 g / 3.3 N
10 mm Stal (~0.2) 0.07 kg / 0.15 pounds
66.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 40x10x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.79 kg / 6.16 pounds
2793.0 g / 27.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.86 kg / 4.11 pounds
1862.0 g / 18.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.93 kg / 2.05 pounds
931.0 g / 9.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.66 kg / 10.26 pounds
4655.0 g / 45.7 N

Table 4: Material efficiency (saturation) - power losses
MPL 40x10x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.93 kg / 2.05 pounds
931.0 g / 9.1 N
1 mm
25%
2.33 kg / 5.13 pounds
2327.5 g / 22.8 N
2 mm
50%
4.66 kg / 10.26 pounds
4655.0 g / 45.7 N
3 mm
75%
6.98 kg / 15.39 pounds
6982.5 g / 68.5 N
5 mm
100%
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
10 mm
100%
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
11 mm
100%
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
12 mm
100%
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N

Table 5: Working in heat (material behavior) - resistance threshold
MPL 40x10x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
OK
40 °C -2.2% 9.11 kg / 20.07 pounds
9105.2 g / 89.3 N
OK
60 °C -4.4% 8.90 kg / 19.62 pounds
8900.4 g / 87.3 N
80 °C -6.6% 8.70 kg / 19.17 pounds
8695.5 g / 85.3 N
100 °C -28.8% 6.63 kg / 14.61 pounds
6628.7 g / 65.0 N

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 40x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 18.71 kg / 41.25 pounds
4 164 Gs
2.81 kg / 6.19 pounds
2807 g / 27.5 N
N/A
1 mm 16.57 kg / 36.53 pounds
5 185 Gs
2.49 kg / 5.48 pounds
2486 g / 24.4 N
14.91 kg / 32.88 pounds
~0 Gs
2 mm 14.36 kg / 31.65 pounds
4 826 Gs
2.15 kg / 4.75 pounds
2153 g / 21.1 N
12.92 kg / 28.48 pounds
~0 Gs
3 mm 12.24 kg / 26.98 pounds
4 455 Gs
1.84 kg / 4.05 pounds
1836 g / 18.0 N
11.01 kg / 24.28 pounds
~0 Gs
5 mm 8.61 kg / 18.98 pounds
3 737 Gs
1.29 kg / 2.85 pounds
1291 g / 12.7 N
7.75 kg / 17.08 pounds
~0 Gs
10 mm 3.39 kg / 7.48 pounds
2 346 Gs
0.51 kg / 1.12 pounds
509 g / 5.0 N
3.05 kg / 6.73 pounds
~0 Gs
20 mm 0.67 kg / 1.48 pounds
1 045 Gs
0.10 kg / 0.22 pounds
101 g / 1.0 N
0.61 kg / 1.34 pounds
~0 Gs
50 mm 0.03 kg / 0.06 pounds
207 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
0.02 kg / 0.05 pounds
~0 Gs
60 mm 0.01 kg / 0.03 pounds
138 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.02 pounds
~0 Gs
70 mm 0.01 kg / 0.01 pounds
96 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
69 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
51 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
39 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Protective zones (electronics) - warnings
MPL 40x10x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Collisions (kinetic energy) - warning
MPL 40x10x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.72 km/h
(7.98 m/s)
0.38 J
30 mm 48.67 km/h
(13.52 m/s)
1.10 J
50 mm 62.82 km/h
(17.45 m/s)
1.83 J
100 mm 88.83 km/h
(24.68 m/s)
3.65 J

Table 9: Corrosion resistance
MPL 40x10x4 / 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 40x10x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 840 Mx 98.4 µWb
Pc Coefficient 0.26 Low (Flat)

Table 11: Submerged application
MPL 40x10x4 / N38

Environment Effective steel pull Effect
Air (land) 9.31 kg Standard
Water (riverbed) 10.66 kg
(+1.35 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

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

2. Steel saturation

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

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

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 and environmental data
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%
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: 020150-2025
Measurement Calculator
Force (pull)

Magnetic Field

Other offers

Model MPL 40x10x4 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 91.33 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding 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 9.31 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 9.31 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 40x10x4 / N38, it is best to use strong epoxy glues (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 40x10x4 / N38 model is magnetized through the thickness (dimension 4 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 (40x10 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 40x10x4 mm, which, at a weight of 12 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 9.31 kg (force ~91.33 N), which, with such a flat shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Pros and cons of neodymium magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
  • They have excellent resistance to magnetism drop as a result of external magnetic sources,
  • By applying a smooth layer of silver, the element presents an modern look,
  • Magnets are characterized by extremely high magnetic induction on the working surface,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of individual creating as well as adjusting to atypical needs,
  • Significant place in advanced technology sectors – they are utilized in data components, drive modules, precision medical tools, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in small systems

Limitations

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease 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 stability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of making nuts in the magnet and complicated forms - recommended is casing - magnetic holder.
  • Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small components of these products can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

The force parameter is a measurement result executed under specific, ideal conditions:
  • with the use of a yoke made of special test steel, ensuring maximum field concentration
  • whose thickness equals approx. 10 mm
  • with a surface perfectly flat
  • with zero gap (no impurities)
  • during detachment in a direction perpendicular to the plane
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the working load will differ influenced by the following factors, starting with the most relevant:
  • Distance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and lifting capacity.
  • Base smoothness – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. Additionally, even a small distance between the magnet and the plate reduces the load capacity.

Warnings
Do not underestimate power

Exercise caution. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can move away.

Fragile material

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them breaking into shards.

This is not a toy

Adult use only. Small elements pose a choking risk, leading to serious injuries. Store away from kids and pets.

Health Danger

Individuals with a heart stimulator should maintain an large gap from magnets. The magnetism can stop the functioning of the life-saving device.

Electronic devices

Powerful magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Mechanical processing

Fire hazard: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.

Pinching danger

Large magnets can smash fingers in a fraction of a second. Do not put your hand betwixt two strong magnets.

Avoid contact if allergic

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop working with magnets and wear gloves.

Precision electronics

Remember: neodymium magnets produce a field that interferes with precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.

Demagnetization risk

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Attention! 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