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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

bulk discounts:

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Technical of the product - 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

Technical simulation of the magnet - report

The following data are the outcome of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs distance) - interaction chart
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
medium risk
1 mm 2920 Gs
292.0 mT
2.54 kg / 5.60 LBS
2538.8 g / 24.9 N
medium risk
2 mm 2399 Gs
239.9 mT
1.71 kg / 3.78 LBS
1713.7 g / 16.8 N
safe
3 mm 1919 Gs
191.9 mT
1.10 kg / 2.42 LBS
1096.3 g / 10.8 N
safe
5 mm 1190 Gs
119.0 mT
0.42 kg / 0.93 LBS
421.6 g / 4.1 N
safe
10 mm 392 Gs
39.2 mT
0.05 kg / 0.10 LBS
45.7 g / 0.4 N
safe
15 mm 162 Gs
16.2 mT
0.01 kg / 0.02 LBS
7.8 g / 0.1 N
safe
20 mm 80 Gs
8.0 mT
0.00 kg / 0.00 LBS
1.9 g / 0.0 N
safe
30 mm 27 Gs
2.7 mT
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
safe
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

Table 2: Slippage load (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: Vertical assembly (sliding) - 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: Material efficiency (saturation) - power losses
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: Working in heat (stability) - resistance threshold
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: Two magnets (repulsion) - field collision
MPL 12x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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: Protective zones (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
Mechanical watch 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 (cracking risk) - warning
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: Anti-corrosion coating durability
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 (Pc)
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%
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. Shear force

*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its max power.

2. Plate thickness effect

*Thin steel (e.g. computer case) significantly weakens the holding force.

3. Power loss vs temp

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.43

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 and environmental data
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%
Environmental data
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
Magnet pull force

Field Strength

Other proposals

Component MPL 12x10x4 / 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. 3.45 kg), this product is available immediately 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 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 12x10x4 / 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.
They constitute a key element in the production of 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. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
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. 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.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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: 12 mm (length), 10 mm (width), and 4 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 3.45 kg (force ~33.88 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Strengths

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They are noted for resistance to demagnetization induced by external field influence,
  • The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Neodymium magnets generate maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • In view of the possibility of precise molding and customization to unique needs, NdFeB magnets can be produced in a variety of forms and dimensions, which expands the range of possible applications,
  • Huge importance in modern industrial fields – they find application in data components, drive modules, precision medical tools, as well as multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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 prevent oxidation as well as corrosion.
  • We recommend casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these products are able to be problematic in diagnostics medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

Maximum lifting capacity of the magnetwhat affects it?

The force parameter is a measurement result performed under the following configuration:
  • with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
  • with a cross-section of at least 10 mm
  • with an polished touching surface
  • with direct contact (without impurities)
  • during pulling in a direction vertical to the plane
  • at ambient temperature room level

Key elements affecting lifting force

Real force is affected by specific conditions, mainly (from priority):
  • Distance (betwixt the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Steel thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be escaped to the other side.
  • Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Phone sensors

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

Medical implants

Warning for patients: Strong magnetic fields affect electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Maximum temperature

Watch the temperature. Heating the magnet to high heat will ruin its properties and pulling force.

Dust is flammable

Powder created during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Powerful field

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Crushing force

Big blocks can break fingers instantly. Under no circumstances place your hand betwixt two strong magnets.

This is not a toy

Always keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets connecting inside the body are fatal.

Data carriers

Powerful magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Sensitization to coating

Certain individuals experience a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Frequent touching can result in an allergic reaction. We suggest wear safety gloves.

Protective goggles

Neodymium magnets are ceramic materials, meaning they are very brittle. Collision of two magnets leads to them breaking into small pieces.

Caution! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98