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MPL 12x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020118

GTIN/EAN: 5906301811244

5.00

length

12 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

3.6 g

Magnetization Direction

↑ axial

Load capacity

3.45 kg / 33.88 N

Magnetic Induction

340.59 mT / 3406 Gs

Coating

[NiCuNi] Nickel

1.697 with VAT / pcs + price for transport

1.380 ZŁ net + 23% VAT / pcs

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Technical - MPL 12x10x4 / N38 - lamellar magnet

Specification / characteristics - MPL 12x10x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020118
GTIN/EAN 5906301811244
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 12 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 3.6 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.45 kg / 33.88 N
Magnetic Induction ~ ? 340.59 mT / 3406 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 12x10x4 / 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 analysis of the assembly - technical parameters

The following information constitute the direct effect of a engineering simulation. Results were calculated on models for the material Nd2Fe14B. Real-world performance may differ. Use these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MPL 12x10x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3404 Gs
340.4 mT
3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
strong
1 mm 2920 Gs
292.0 mT
2.54 kg / 5.60 lbs
2538.8 g / 24.9 N
strong
2 mm 2399 Gs
239.9 mT
1.71 kg / 3.78 lbs
1713.7 g / 16.8 N
low risk
3 mm 1919 Gs
191.9 mT
1.10 kg / 2.42 lbs
1096.3 g / 10.8 N
low risk
5 mm 1190 Gs
119.0 mT
0.42 kg / 0.93 lbs
421.6 g / 4.1 N
low risk
10 mm 392 Gs
39.2 mT
0.05 kg / 0.10 lbs
45.7 g / 0.4 N
low risk
15 mm 162 Gs
16.2 mT
0.01 kg / 0.02 lbs
7.8 g / 0.1 N
low risk
20 mm 80 Gs
8.0 mT
0.00 kg / 0.00 lbs
1.9 g / 0.0 N
low risk
30 mm 27 Gs
2.7 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
low risk
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk

Table 2: Sliding hold (wall)
MPL 12x10x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.69 kg / 1.52 lbs
690.0 g / 6.8 N
1 mm Stal (~0.2) 0.51 kg / 1.12 lbs
508.0 g / 5.0 N
2 mm Stal (~0.2) 0.34 kg / 0.75 lbs
342.0 g / 3.4 N
3 mm Stal (~0.2) 0.22 kg / 0.49 lbs
220.0 g / 2.2 N
5 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
10 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MPL 12x10x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.04 kg / 2.28 lbs
1035.0 g / 10.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.69 kg / 1.52 lbs
690.0 g / 6.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.35 kg / 0.76 lbs
345.0 g / 3.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.73 kg / 3.80 lbs
1725.0 g / 16.9 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 12x10x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.35 kg / 0.76 lbs
345.0 g / 3.4 N
1 mm
25%
0.86 kg / 1.90 lbs
862.5 g / 8.5 N
2 mm
50%
1.73 kg / 3.80 lbs
1725.0 g / 16.9 N
3 mm
75%
2.59 kg / 5.70 lbs
2587.5 g / 25.4 N
5 mm
100%
3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
10 mm
100%
3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
11 mm
100%
3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
12 mm
100%
3.45 kg / 7.61 lbs
3450.0 g / 33.8 N

Table 5: Thermal stability (stability) - power drop
MPL 12x10x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
OK
40 °C -2.2% 3.37 kg / 7.44 lbs
3374.1 g / 33.1 N
OK
60 °C -4.4% 3.30 kg / 7.27 lbs
3298.2 g / 32.4 N
80 °C -6.6% 3.22 kg / 7.10 lbs
3222.3 g / 31.6 N
100 °C -28.8% 2.46 kg / 5.42 lbs
2456.4 g / 24.1 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 12x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.57 kg / 18.90 lbs
4 915 Gs
1.29 kg / 2.84 lbs
1286 g / 12.6 N
N/A
1 mm 7.46 kg / 16.44 lbs
6 349 Gs
1.12 kg / 2.47 lbs
1118 g / 11.0 N
6.71 kg / 14.79 lbs
~0 Gs
2 mm 6.31 kg / 13.91 lbs
5 841 Gs
0.95 kg / 2.09 lbs
946 g / 9.3 N
5.68 kg / 12.52 lbs
~0 Gs
3 mm 5.23 kg / 11.53 lbs
5 317 Gs
0.78 kg / 1.73 lbs
784 g / 7.7 N
4.71 kg / 10.37 lbs
~0 Gs
5 mm 3.42 kg / 7.55 lbs
4 302 Gs
0.51 kg / 1.13 lbs
513 g / 5.0 N
3.08 kg / 6.79 lbs
~0 Gs
10 mm 1.05 kg / 2.31 lbs
2 380 Gs
0.16 kg / 0.35 lbs
157 g / 1.5 N
0.94 kg / 2.08 lbs
~0 Gs
20 mm 0.11 kg / 0.25 lbs
784 Gs
0.02 kg / 0.04 lbs
17 g / 0.2 N
0.10 kg / 0.23 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
90 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
55 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
36 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
25 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
18 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
13 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Hazards (implants) - precautionary measures
MPL 12x10x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Collisions (kinetic energy) - collision effects
MPL 12x10x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 31.48 km/h
(8.74 m/s)
0.14 J
30 mm 54.08 km/h
(15.02 m/s)
0.41 J
50 mm 69.81 km/h
(19.39 m/s)
0.68 J
100 mm 98.73 km/h
(27.42 m/s)
1.35 J

Table 9: Corrosion resistance
MPL 12x10x4 / 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 12x10x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 295 Mx 42.9 µWb
Pc Coefficient 0.43 Low (Flat)

Table 11: Submerged application
MPL 12x10x4 / N38

Environment Effective steel pull Effect
Air (land) 3.45 kg Standard
Water (riverbed) 3.95 kg
(+0.50 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

*Warning: On a vertical surface, the magnet holds only a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Power loss vs temp

*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) = 0.43

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.

Engineering data and GPSR
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: 020118-2026
Measurement Calculator
Pulling force

Field Strength

View also products

Model MPL 12x10x4 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 33.88 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
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 3.45 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 3.45 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 12x10x4 / N38, it is best to use two-component adhesives (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.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (12x10 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 12x10x4 mm, which, at a weight of 3.6 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 12x10x4 mm and a self-weight of 3.6 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of Nd2Fe14B magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • They do not lose their magnetic properties even under close interference source,
  • A magnet with a smooth gold surface is more attractive,
  • Neodymium magnets ensure maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Due to the possibility of flexible molding and customization to individualized projects, neodymium magnets can be manufactured in a variety of shapes and sizes, which amplifies use scope,
  • Significant place in advanced technology sectors – they are utilized in mass storage devices, electric drive systems, advanced medical instruments, as well as technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating nuts in the magnet and complicated forms - recommended is a housing - magnet mounting.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

Breakaway force was defined for the most favorable conditions, taking into account:
  • on a block made of mild steel, optimally conducting the magnetic flux
  • with a cross-section of at least 10 mm
  • characterized by lack of roughness
  • without any clearance between the magnet and steel
  • under axial application of breakaway force (90-degree angle)
  • in stable room temperature

Key elements affecting lifting force

In real-world applications, the actual holding force is determined by a number of factors, listed from most significant:
  • Distance – the presence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Steel thickness – too thin plate does not close the flux, causing part of the flux to be escaped into the air.
  • Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was assessed using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Avoid contact if allergic

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, avoid direct skin contact and select coated magnets.

Impact on smartphones

GPS units and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

This is not a toy

Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are life-threatening.

Heat sensitivity

Keep cool. NdFeB magnets are susceptible to heat. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Handling guide

Handle magnets with awareness. Their huge power can shock even experienced users. Stay alert and do not underestimate their power.

Mechanical processing

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

Data carriers

Avoid bringing magnets close to a wallet, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.

Physical harm

Protect your hands. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

ICD Warning

People with a pacemaker have to keep an safe separation from magnets. The magnetism can stop the functioning of the life-saving device.

Beware of splinters

NdFeB magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them breaking into shards.

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