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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

Physical simulation of the assembly - data

Presented values are the result of a physical analysis. Values were calculated on algorithms for the material Nd2Fe14B. Actual conditions may differ. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull 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
warning
1 mm 2920 Gs
292.0 mT
2.54 kg / 5.60 lbs
2538.8 g / 24.9 N
warning
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 (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) - behavior on slippery surfaces
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 (saturation) - 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) - thermal limit
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 (attraction) - field range
MPL 12x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 (electronics) - 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: Impact energy (cracking risk) - 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: Coating parameters (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 (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%
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. Vertical hold

*Caution: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly 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) = 0.43

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 specification and ecology
Chemical composition
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
Pulling force

Field Strength

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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 12x10x4 mm and a weight of 3.6 g, guarantees the highest quality connection. This magnetic 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 12x10x4 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
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 hidden locks in furniture making and mounting elements in automation. 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 12x10x4 / N38 model is magnetized axially (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. 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 high 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 product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of rare earth magnets.

Benefits

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • Their strength is durable, and after around ten years it drops only by ~1% (theoretically),
  • Neodymium magnets are extremely resistant to loss of magnetic properties caused by external magnetic fields,
  • Thanks to the smooth finish, the coating of nickel, gold-plated, or silver-plated gives an elegant appearance,
  • Magnets are characterized by very high magnetic induction on the outer layer,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Thanks to modularity in shaping and the ability to adapt to individual projects,
  • Wide application in innovative solutions – they find application in mass storage devices, electric motors, medical equipment, also other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing nuts and complicated forms in magnets, we recommend using cover - magnetic mount.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets are able to complicate diagnosis medical when they are in the body.
  • Due to neodymium price, their price exceeds standard values,

Pull force analysis

Optimal lifting capacity of a neodymium magnetwhat it depends on?

Holding force of 3.45 kg is a measurement result executed under standard conditions:
  • with the contact of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with an polished contact surface
  • without any clearance between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

In real-world applications, the real power depends on several key aspects, presented from crucial:
  • Gap (between the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Base massiveness – too thin steel does not close the flux, causing part of the power to be lost into the air.
  • Material type – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Plate texture – ground elements ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Powerful field

Use magnets consciously. Their huge power can surprise even professionals. Stay alert and do not underestimate their power.

Precision electronics

Remember: rare earth magnets generate a field that interferes with precision electronics. Keep a safe distance from your phone, device, and GPS.

Product not for children

Strictly store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are fatal.

Bone fractures

Big blocks can smash fingers in a fraction of a second. Never put your hand between two attracting surfaces.

Machining danger

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

Life threat

Warning for patients: Powerful magnets affect medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.

Protect data

Intense magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Warning for allergy sufferers

Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands or opt for versions in plastic housing.

Demagnetization risk

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

Material brittleness

NdFeB magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets will cause them shattering into small pieces.

Attention! Need more info? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98