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MPL 40x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020152

GTIN/EAN: 5906301811589

5.00

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

15 g

Magnetization Direction

↑ axial

Load capacity

11.85 kg / 116.27 N

Magnetic Induction

321.37 mT / 3214 Gs

Coating

[NiCuNi] Nickel

6.03 with VAT / pcs + price for transport

4.90 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical details - MPL 40x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020152
GTIN/EAN 5906301811589
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 5 mm [±0,1 mm]
Weight 15 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.85 kg / 116.27 N
Magnetic Induction ~ ? 321.37 mT / 3214 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x5 / 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 modeling of the product - data

The following data represent the result of a physical analysis. Values rely on models for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (force vs gap) - power drop
MPL 40x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3212 Gs
321.2 mT
11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
crushing
1 mm 2791 Gs
279.1 mT
8.95 kg / 19.73 pounds
8947.7 g / 87.8 N
medium risk
2 mm 2358 Gs
235.8 mT
6.38 kg / 14.08 pounds
6384.9 g / 62.6 N
medium risk
3 mm 1965 Gs
196.5 mT
4.43 kg / 9.77 pounds
4432.4 g / 43.5 N
medium risk
5 mm 1360 Gs
136.0 mT
2.12 kg / 4.68 pounds
2122.9 g / 20.8 N
medium risk
10 mm 615 Gs
61.5 mT
0.43 kg / 0.96 pounds
434.1 g / 4.3 N
low risk
15 mm 329 Gs
32.9 mT
0.12 kg / 0.27 pounds
124.5 g / 1.2 N
low risk
20 mm 195 Gs
19.5 mT
0.04 kg / 0.10 pounds
43.9 g / 0.4 N
low risk
30 mm 83 Gs
8.3 mT
0.01 kg / 0.02 pounds
8.0 g / 0.1 N
low risk
50 mm 24 Gs
2.4 mT
0.00 kg / 0.00 pounds
0.6 g / 0.0 N
low risk

Table 2: Vertical capacity (wall)
MPL 40x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.37 kg / 5.22 pounds
2370.0 g / 23.2 N
1 mm Stal (~0.2) 1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
2 mm Stal (~0.2) 1.28 kg / 2.81 pounds
1276.0 g / 12.5 N
3 mm Stal (~0.2) 0.89 kg / 1.95 pounds
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.42 kg / 0.93 pounds
424.0 g / 4.2 N
10 mm Stal (~0.2) 0.09 kg / 0.19 pounds
86.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 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 (sliding) - behavior on slippery surfaces
MPL 40x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.55 kg / 7.84 pounds
3555.0 g / 34.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.37 kg / 5.22 pounds
2370.0 g / 23.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.19 kg / 2.61 pounds
1185.0 g / 11.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.93 kg / 13.06 pounds
5925.0 g / 58.1 N

Table 4: Steel thickness (saturation) - power losses
MPL 40x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.59 kg / 1.31 pounds
592.5 g / 5.8 N
1 mm
13%
1.48 kg / 3.27 pounds
1481.3 g / 14.5 N
2 mm
25%
2.96 kg / 6.53 pounds
2962.5 g / 29.1 N
3 mm
38%
4.44 kg / 9.80 pounds
4443.8 g / 43.6 N
5 mm
63%
7.41 kg / 16.33 pounds
7406.3 g / 72.7 N
10 mm
100%
11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
11 mm
100%
11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
12 mm
100%
11.85 kg / 26.12 pounds
11850.0 g / 116.2 N

Table 5: Thermal stability (material behavior) - resistance threshold
MPL 40x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
OK
40 °C -2.2% 11.59 kg / 25.55 pounds
11589.3 g / 113.7 N
OK
60 °C -4.4% 11.33 kg / 24.98 pounds
11328.6 g / 111.1 N
80 °C -6.6% 11.07 kg / 24.40 pounds
11067.9 g / 108.6 N
100 °C -28.8% 8.44 kg / 18.60 pounds
8437.2 g / 82.8 N

Table 6: Two magnets (attraction) - field range
MPL 40x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 25.44 kg / 56.10 pounds
4 569 Gs
3.82 kg / 8.41 pounds
3817 g / 37.4 N
N/A
1 mm 22.33 kg / 49.22 pounds
6 018 Gs
3.35 kg / 7.38 pounds
3349 g / 32.9 N
20.09 kg / 44.30 pounds
~0 Gs
2 mm 19.21 kg / 42.36 pounds
5 582 Gs
2.88 kg / 6.35 pounds
2882 g / 28.3 N
17.29 kg / 38.12 pounds
~0 Gs
3 mm 16.31 kg / 35.96 pounds
5 144 Gs
2.45 kg / 5.39 pounds
2447 g / 24.0 N
14.68 kg / 32.36 pounds
~0 Gs
5 mm 11.45 kg / 25.23 pounds
4 309 Gs
1.72 kg / 3.78 pounds
1717 g / 16.8 N
10.30 kg / 22.71 pounds
~0 Gs
10 mm 4.56 kg / 10.05 pounds
2 719 Gs
0.68 kg / 1.51 pounds
684 g / 6.7 N
4.10 kg / 9.04 pounds
~0 Gs
20 mm 0.93 kg / 2.05 pounds
1 230 Gs
0.14 kg / 0.31 pounds
140 g / 1.4 N
0.84 kg / 1.85 pounds
~0 Gs
50 mm 0.04 kg / 0.08 pounds
249 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
0.03 kg / 0.08 pounds
~0 Gs
60 mm 0.02 kg / 0.04 pounds
167 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.03 pounds
~0 Gs
70 mm 0.01 kg / 0.02 pounds
116 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
84 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
62 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
48 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 40x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Mechanical watch 20 Gs (2.0 mT) 5.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.5 cm
Car key 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Collisions (cracking risk) - collision effects
MPL 40x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.99 km/h
(8.05 m/s)
0.49 J
30 mm 49.12 km/h
(13.64 m/s)
1.40 J
50 mm 63.39 km/h
(17.61 m/s)
2.33 J
100 mm 89.64 km/h
(24.90 m/s)
4.65 J

Table 9: Corrosion resistance
MPL 40x10x5 / 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 40x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 11 419 Mx 114.2 µWb
Pc Coefficient 0.31 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 40x10x5 / N38

Environment Effective steel pull Effect
Air (land) 11.85 kg Standard
Water (riverbed) 13.57 kg
(+1.72 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Warning: On a vertical wall, the magnet holds merely a fraction of its nominal pull.

2. Plate thickness effect

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

3. Thermal stability

*For standard magnets, 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

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 specification and ecology
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: 020152-2026
Quick Unit Converter
Magnet pull force

Field Strength

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Component MPL 40x10x5 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 11.85 kg), this product is available immediately from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating secures 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. To separate the MPL 40x10x5 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x10x5 / 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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
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. 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 40x10x5 / N38 model is magnetized through the thickness (dimension 5 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), 10 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 40x10x5 mm and a self-weight of 15 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of neodymium magnets.

Pros

Apart from their superior holding force, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • A magnet with a shiny nickel surface is more attractive,
  • Magnetic induction on the working part of the magnet remains maximum,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to freedom in shaping and the ability to customize to client solutions,
  • Huge importance in advanced technology sectors – they are used in hard drives, brushless drives, precision medical tools, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We suggest casing - magnetic mount, due to difficulties in producing nuts inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these devices can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Magnetic strength at its maximum – what it depends on?

Magnet power is the result of a measurement for ideal contact conditions, including:
  • with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
  • with a thickness no less than 10 mm
  • with an ground contact surface
  • without any air gap between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Practical lifting capacity: influencing factors

In real-world applications, the actual holding force is determined by many variables, listed from crucial:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
  • Surface quality – the more even the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets
Adults only

Absolutely store magnets away from children. Ingestion danger is high, and the effects of magnets connecting inside the body are life-threatening.

Metal Allergy

A percentage of the population experience a hypersensitivity to nickel, which is the common plating for neodymium magnets. Prolonged contact may cause a rash. We strongly advise wear protective gloves.

Conscious usage

Before use, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

GPS and phone interference

A powerful magnetic field negatively affects the functioning of magnetometers in smartphones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.

Finger safety

Big blocks can smash fingers instantly. Do not put your hand betwixt two attracting surfaces.

Heat warning

Avoid heat. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Magnetic media

Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).

Machining danger

Powder produced during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Fragile material

Watch out for shards. Magnets can explode upon violent connection, ejecting shards into the air. Eye protection is mandatory.

ICD Warning

People with a heart stimulator have to maintain an absolute distance from magnets. The magnetic field can disrupt the operation of the implant.

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

e-mail: bok@dhit.pl

tel: +48 888 99 98 98