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MPL 30x15x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020140

GTIN/EAN: 5906301811466

5.00
Load capacity 2.11 kg / 20.69 N Magnetic Induction 115.11 mT / 1151 Gs
length
30 mm [±0,1 mm]
Width
15 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
6.75 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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price from 1 pcs
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price from 200 pcs
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price from 800 pcs
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3.42 zł

Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical - MPL 30x15x2 / N38 - lamellar magnet

Specification / characteristics - MPL 30x15x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020140
GTIN/EAN 5906301811466
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 30 mm [±0,1 mm]
Width 15 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 6.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.11 kg / 20.69 N
Magnetic Induction ~ ? 115.11 mT / 1151 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x15x2 / N38 - lamellar magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 modeling of the magnet - technical parameters

The following values are the direct effect of a mathematical calculation. Values rely on models for the class Nd2Fe14B. Real-world conditions may differ. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
MPL 30x15x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1151 Gs
115.1 mT
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
warning
1 mm 1098 Gs
109.8 mT
1.92 kg / 4.23 lbs
1920.5 g / 18.8 N
low risk
2 mm 1019 Gs
101.9 mT
1.65 kg / 3.65 lbs
1654.9 g / 16.2 N
low risk
3 mm 926 Gs
92.6 mT
1.37 kg / 3.01 lbs
1365.9 g / 13.4 N
low risk
5 mm 733 Gs
73.3 mT
0.86 kg / 1.89 lbs
855.2 g / 8.4 N
low risk
10 mm 379 Gs
37.9 mT
0.23 kg / 0.50 lbs
228.8 g / 2.2 N
low risk
15 mm 203 Gs
20.3 mT
0.07 kg / 0.14 lbs
65.6 g / 0.6 N
low risk
20 mm 116 Gs
11.6 mT
0.02 kg / 0.05 lbs
21.6 g / 0.2 N
low risk
30 mm 46 Gs
4.6 mT
0.00 kg / 0.01 lbs
3.4 g / 0.0 N
low risk
50 mm 12 Gs
1.2 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
low risk

Table 2: Shear load (wall)
MPL 30x15x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.42 kg / 0.93 lbs
422.0 g / 4.1 N
1 mm Stal (~0.2) 0.38 kg / 0.85 lbs
384.0 g / 3.8 N
2 mm Stal (~0.2) 0.33 kg / 0.73 lbs
330.0 g / 3.2 N
3 mm Stal (~0.2) 0.27 kg / 0.60 lbs
274.0 g / 2.7 N
5 mm Stal (~0.2) 0.17 kg / 0.38 lbs
172.0 g / 1.7 N
10 mm Stal (~0.2) 0.05 kg / 0.10 lbs
46.0 g / 0.5 N
15 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 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 (sliding) - behavior on slippery surfaces
MPL 30x15x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.63 kg / 1.40 lbs
633.0 g / 6.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.42 kg / 0.93 lbs
422.0 g / 4.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.21 kg / 0.47 lbs
211.0 g / 2.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.06 kg / 2.33 lbs
1055.0 g / 10.3 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 30x15x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.21 kg / 0.47 lbs
211.0 g / 2.1 N
1 mm
25%
0.53 kg / 1.16 lbs
527.5 g / 5.2 N
2 mm
50%
1.06 kg / 2.33 lbs
1055.0 g / 10.3 N
3 mm
75%
1.58 kg / 3.49 lbs
1582.5 g / 15.5 N
5 mm
100%
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
10 mm
100%
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
11 mm
100%
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
12 mm
100%
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N

Table 5: Thermal resistance (stability) - power drop
MPL 30x15x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
OK
40 °C -2.2% 2.06 kg / 4.55 lbs
2063.6 g / 20.2 N
OK
60 °C -4.4% 2.02 kg / 4.45 lbs
2017.2 g / 19.8 N
80 °C -6.6% 1.97 kg / 4.34 lbs
1970.7 g / 19.3 N
100 °C -28.8% 1.50 kg / 3.31 lbs
1502.3 g / 14.7 N

Table 6: Two magnets (attraction) - field collision
MPL 30x15x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.67 kg / 8.10 lbs
2 169 Gs
0.55 kg / 1.22 lbs
551 g / 5.4 N
N/A
1 mm 3.53 kg / 7.79 lbs
2 257 Gs
0.53 kg / 1.17 lbs
530 g / 5.2 N
3.18 kg / 7.01 lbs
~0 Gs
2 mm 3.34 kg / 7.37 lbs
2 196 Gs
0.50 kg / 1.11 lbs
502 g / 4.9 N
3.01 kg / 6.64 lbs
~0 Gs
3 mm 3.12 kg / 6.89 lbs
2 122 Gs
0.47 kg / 1.03 lbs
469 g / 4.6 N
2.81 kg / 6.20 lbs
~0 Gs
5 mm 2.63 kg / 5.80 lbs
1 948 Gs
0.39 kg / 0.87 lbs
395 g / 3.9 N
2.37 kg / 5.22 lbs
~0 Gs
10 mm 1.49 kg / 3.28 lbs
1 465 Gs
0.22 kg / 0.49 lbs
223 g / 2.2 N
1.34 kg / 2.96 lbs
~0 Gs
20 mm 0.40 kg / 0.88 lbs
758 Gs
0.06 kg / 0.13 lbs
60 g / 0.6 N
0.36 kg / 0.79 lbs
~0 Gs
50 mm 0.01 kg / 0.03 lbs
142 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
0.01 kg / 0.03 lbs
~0 Gs
60 mm 0.01 kg / 0.01 lbs
92 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.01 lbs
63 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
44 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
32 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
24 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 30x15x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 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 (kinetic energy) - warning
MPL 30x15x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.39 km/h
(5.39 m/s)
0.10 J
30 mm 20.27 km/h
(5.63 m/s)
0.11 J
50 mm 20.27 km/h
(5.63 m/s)
0.11 J
100 mm 20.30 km/h
(5.64 m/s)
0.11 J

Table 9: Anti-corrosion coating durability
MPL 30x15x2 / 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 30x15x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 236 Mx 62.4 µWb
Pc Coefficient 0.13 Low (Flat)

Table 11: Physics of underwater searching
MPL 30x15x2 / N38

Environment Effective steel pull Effect
Air (land) 2.11 kg Standard
Water (riverbed) 2.42 kg
(+0.31 kg buoyancy gain)
+14.5%
Warning: 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 wall, the magnet holds just ~20% of its nominal pull.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.13

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

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: 020140-2026
Measurement Calculator

Force (pull)


Field Strength

See also deals

This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x15x2 mm and a weight of 6.75 g, guarantees the highest quality connection. As a block magnet with high power (approx. 2.11 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 30x15x2 / 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 30x15x2 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners 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. 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 30x15x2 / N38 model is magnetized through the thickness (dimension 2 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (30x15 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 30x15x2 mm, which, at a weight of 6.75 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 30x15x2 mm and a self-weight of 6.75 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros and cons of rare earth magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They do not lose power, even over approximately ten years – the drop in power is only ~1% (according to tests),
  • They have excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • Thanks to the metallic finish, the plating of nickel, gold-plated, or silver gives an elegant appearance,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to versatility in constructing and the ability to modify to complex applications,
  • Universal use in electronics industry – they find application in hard drives, motor assemblies, medical devices, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in small systems

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
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complicated shapes in magnets, we recommend using casing - magnetic mount.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Detachment force of the magnet in optimal conditionswhat contributes to it?

The force parameter is a theoretical maximum value performed under the following configuration:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • with a thickness of at least 10 mm
  • characterized by lack of roughness
  • with total lack of distance (without paint)
  • for force applied at a right angle (pull-off, not shear)
  • at room temperature

What influences lifting capacity in practice

Please note that the magnet holding may be lower influenced by the following factors, starting with the most relevant:
  • Clearance – the presence of foreign body (rust, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Material composition – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets
Do not drill into magnets

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Pinching danger

Pinching hazard: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Medical interference

Individuals with a heart stimulator must keep an large gap from magnets. The magnetism can disrupt the functioning of the implant.

Handling guide

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Keep away from computers

Equipment safety: Strong magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Operating temperature

Keep cool. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Eye protection

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

This is not a toy

Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are very dangerous.

Nickel allergy

Medical facts indicate that nickel (standard magnet coating) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands and select encased magnets.

GPS and phone interference

Note: neodymium magnets produce a field that confuses precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Caution! Looking for details? Check our post: Why are neodymium magnets dangerous?