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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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Detailed specification - 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

Engineering simulation of the magnet - report

Presented values represent the direct effect of a engineering calculation. Values are based on algorithms for the material Nd2Fe14B. Operational parameters may differ. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - 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
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 hold (vertical surface)
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: Steel thickness (substrate influence) - 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: Thermal resistance (material behavior) - 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 range
MPL 12x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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) - warnings
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
Mobile device 40 Gs (4.0 mT) 3.0 cm
Car key 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: Dynamics (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: 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: Electrical 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: Hydrostatics and buoyancy
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Caution: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically reduces the holding force.

3. Temperature resistance

*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.

Engineering data and GPSR
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%
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
Magnet pull force

Magnetic Field

Other proposals

Component MPL 12x10x4 / N38 features a low profile and professional 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. 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 3.45 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 12x10x4 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. 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 workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 12x10x4 / N38, we recommend utilizing 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 12x10x4 / 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. 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 grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of rare earth magnets.

Pros

Besides their immense pulling force, neodymium magnets offer the following advantages:
  • They do not lose power, even during around ten years – the reduction in strength is only ~1% (according to tests),
  • They do not lose their magnetic properties even under strong external field,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnets are characterized by exceptionally strong magnetic induction on the working surface,
  • 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...
  • Due to the ability of accurate forming and customization to specialized requirements, neodymium magnets can be created in a variety of geometric configurations, which amplifies use scope,
  • Key role in electronics industry – they are commonly used in computer drives, drive modules, precision medical tools, also modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing threads and complicated forms in magnets, we propose using cover - magnetic mount.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these magnets can complicate diagnosis medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is a challenge,

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

The lifting capacity listed is a result of laboratory testing conducted under specific, ideal conditions:
  • with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • whose thickness is min. 10 mm
  • with a plane free of scratches
  • without any insulating layer between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • in temp. approx. 20°C

Determinants of lifting force in real conditions

Please note that the magnet holding may be lower subject to the following factors, in order of importance:
  • Space between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Chemical composition of the base – mild steel attracts best. Alloy steels decrease magnetic permeability and holding force.
  • Surface condition – smooth surfaces ensure maximum contact, which improves force. Rough surfaces weaken the grip.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the holding force.

Safe handling of NdFeB magnets
Fire risk

Fire warning: Neodymium dust is explosive. Do not process magnets without safety gear as this may cause fire.

Operating temperature

Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. Damage is permanent.

Protect data

Powerful magnetic fields can destroy records on credit cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Medical interference

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Handling rules

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

Serious injuries

Danger of trauma: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Danger to the youngest

Only for adults. Small elements can be swallowed, leading to serious injuries. Store away from kids and pets.

Warning for allergy sufferers

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, refrain from touching magnets with bare hands and opt for coated magnets.

GPS and phone interference

An intense magnetic field negatively affects the operation of compasses in phones and GPS navigation. Do not bring magnets near a smartphone to prevent breaking the sensors.

Fragile material

Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Warning! Need more info? Check our post: Are neodymium magnets dangerous?