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MPL 30x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020138

GTIN/EAN: 5906301811442

5.00
Load capacity 8.89 kg / 87.23 N Magnetic Induction 329.52 mT / 3295 Gs
length
30 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.25 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

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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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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical of the product - MPL 30x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020138
GTIN/EAN 5906301811442
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 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.89 kg / 87.23 N
Magnetic Induction ~ ? 329.52 mT / 3295 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x10x5 / 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 analysis of the magnet - data

Presented values constitute the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MPL 30x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3294 Gs
329.4 mT
8.89 kg / 19.60 LBS
8890.0 g / 87.2 N
strong
1 mm 2866 Gs
286.6 mT
6.73 kg / 14.84 LBS
6731.1 g / 66.0 N
strong
2 mm 2424 Gs
242.4 mT
4.82 kg / 10.62 LBS
4816.4 g / 47.2 N
strong
3 mm 2022 Gs
202.2 mT
3.35 kg / 7.38 LBS
3349.6 g / 32.9 N
strong
5 mm 1397 Gs
139.7 mT
1.60 kg / 3.53 LBS
1600.3 g / 15.7 N
weak grip
10 mm 615 Gs
61.5 mT
0.31 kg / 0.68 LBS
309.8 g / 3.0 N
weak grip
15 mm 314 Gs
31.4 mT
0.08 kg / 0.18 LBS
80.6 g / 0.8 N
weak grip
20 mm 177 Gs
17.7 mT
0.03 kg / 0.06 LBS
25.8 g / 0.3 N
weak grip
30 mm 70 Gs
7.0 mT
0.00 kg / 0.01 LBS
4.1 g / 0.0 N
weak grip
50 mm 19 Gs
1.9 mT
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
weak grip

Table 2: Sliding hold (vertical surface)
MPL 30x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.78 kg / 3.92 LBS
1778.0 g / 17.4 N
1 mm Stal (~0.2) 1.35 kg / 2.97 LBS
1346.0 g / 13.2 N
2 mm Stal (~0.2) 0.96 kg / 2.13 LBS
964.0 g / 9.5 N
3 mm Stal (~0.2) 0.67 kg / 1.48 LBS
670.0 g / 6.6 N
5 mm Stal (~0.2) 0.32 kg / 0.71 LBS
320.0 g / 3.1 N
10 mm Stal (~0.2) 0.06 kg / 0.14 LBS
62.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 LBS
16.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 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 (shearing) - vertical pull
MPL 30x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.67 kg / 5.88 LBS
2667.0 g / 26.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.78 kg / 3.92 LBS
1778.0 g / 17.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.89 kg / 1.96 LBS
889.0 g / 8.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.45 kg / 9.80 LBS
4445.0 g / 43.6 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 30x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.89 kg / 1.96 LBS
889.0 g / 8.7 N
1 mm
25%
2.22 kg / 4.90 LBS
2222.5 g / 21.8 N
2 mm
50%
4.45 kg / 9.80 LBS
4445.0 g / 43.6 N
3 mm
75%
6.67 kg / 14.70 LBS
6667.5 g / 65.4 N
5 mm
100%
8.89 kg / 19.60 LBS
8890.0 g / 87.2 N
10 mm
100%
8.89 kg / 19.60 LBS
8890.0 g / 87.2 N
11 mm
100%
8.89 kg / 19.60 LBS
8890.0 g / 87.2 N
12 mm
100%
8.89 kg / 19.60 LBS
8890.0 g / 87.2 N

Table 5: Thermal stability (stability) - power drop
MPL 30x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.89 kg / 19.60 LBS
8890.0 g / 87.2 N
OK
40 °C -2.2% 8.69 kg / 19.17 LBS
8694.4 g / 85.3 N
OK
60 °C -4.4% 8.50 kg / 18.74 LBS
8498.8 g / 83.4 N
80 °C -6.6% 8.30 kg / 18.31 LBS
8303.3 g / 81.5 N
100 °C -28.8% 6.33 kg / 13.95 LBS
6329.7 g / 62.1 N

Table 6: Two magnets (repulsion) - field collision
MPL 30x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 20.06 kg / 44.23 LBS
4 689 Gs
3.01 kg / 6.63 LBS
3010 g / 29.5 N
N/A
1 mm 17.63 kg / 38.86 LBS
6 174 Gs
2.64 kg / 5.83 LBS
2644 g / 25.9 N
15.86 kg / 34.98 LBS
~0 Gs
2 mm 15.19 kg / 33.49 LBS
5 732 Gs
2.28 kg / 5.02 LBS
2279 g / 22.4 N
13.67 kg / 30.14 LBS
~0 Gs
3 mm 12.92 kg / 28.47 LBS
5 285 Gs
1.94 kg / 4.27 LBS
1937 g / 19.0 N
11.62 kg / 25.63 LBS
~0 Gs
5 mm 9.08 kg / 20.03 LBS
4 432 Gs
1.36 kg / 3.00 LBS
1363 g / 13.4 N
8.18 kg / 18.02 LBS
~0 Gs
10 mm 3.61 kg / 7.96 LBS
2 795 Gs
0.54 kg / 1.19 LBS
542 g / 5.3 N
3.25 kg / 7.17 LBS
~0 Gs
20 mm 0.70 kg / 1.54 LBS
1 230 Gs
0.10 kg / 0.23 LBS
105 g / 1.0 N
0.63 kg / 1.39 LBS
~0 Gs
50 mm 0.02 kg / 0.05 LBS
217 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
0.02 kg / 0.04 LBS
~0 Gs
60 mm 0.01 kg / 0.02 LBS
141 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
96 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
68 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
50 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
38 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 30x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (kinetic energy) - warning
MPL 30x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.33 km/h
(6.76 m/s)
0.26 J
30 mm 24.87 km/h
(6.91 m/s)
0.27 J
50 mm 24.88 km/h
(6.91 m/s)
0.27 J
100 mm 24.88 km/h
(6.91 m/s)
0.27 J

Table 9: Anti-corrosion coating durability
MPL 30x10x5 / 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 30x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 370 Mx 93.7 µWb
Pc Coefficient 0.35 Low (Flat)

Table 11: Physics of underwater searching
MPL 30x10x5 / N38

Environment Effective steel pull Effect
Air (land) 8.89 kg Standard
Water (riverbed) 10.18 kg
(+1.29 kg buoyancy gain)
+14.5%
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 wall, the magnet retains merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Heat tolerance

*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) = 0.35

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.

Technical and environmental data

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%

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: 020138-2026
Measurement Calculator

Magnet pull force


Magnetic Field

Other offers

This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x10x5 mm and a weight of 11.25 g, guarantees premium class connection. As a magnetic bar with high power (approx. 8.89 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 8.89 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. 8.89 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 30x10x5 / N38, we recommend utilizing strong epoxy glues (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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 30x10x5 / N38 model is magnetized through the thickness (dimension 5 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: 30 mm (length), 10 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 30x10x5 mm and a self-weight of 11.25 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under external field action,
  • In other words, due to the shiny finish of nickel, the element gains visual value,
  • Magnets are characterized by maximum magnetic induction on the outer side,
  • 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...
  • Thanks to flexibility in constructing and the ability to customize to specific needs,
  • Significant place in high-tech industry – they are commonly used in computer drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • under axial force direction (90-degree angle)
  • at standard ambient temperature

Lifting capacity in real conditions – factors

Real force impacted by specific conditions, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Compass and GPS

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.

Shattering risk

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Pinching danger

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Dust is flammable

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Safe distance

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Handling guide

Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.

Product not for children

These products are not toys. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Health Danger

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Warning! Details about risks in the article: Safety of working with magnets.