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MPL 30x10x8 / N38 - lamellar magnet

lamellar magnet

Catalog no 020139

GTIN/EAN: 5906301811459

5.00

length

30 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

18 g

Magnetization Direction

↑ axial

Load capacity

12.13 kg / 119.04 N

Magnetic Induction

427.56 mT / 4276 Gs

Coating

[NiCuNi] Nickel

10.71 with VAT / pcs + price for transport

8.71 ZŁ net + 23% VAT / pcs

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Product card - MPL 30x10x8 / N38 - lamellar magnet

Specification / characteristics - MPL 30x10x8 / N38 - lamellar magnet

properties
properties values
Cat. no. 020139
GTIN/EAN 5906301811459
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 8 mm [±0,1 mm]
Weight 18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 12.13 kg / 119.04 N
Magnetic Induction ~ ? 427.56 mT / 4276 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x10x8 / 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

The following information represent the outcome of a mathematical calculation. Results are based on algorithms for the material Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
MPL 30x10x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4273 Gs
427.3 mT
12.13 kg / 26.74 pounds
12130.0 g / 119.0 N
crushing
1 mm 3683 Gs
368.3 mT
9.01 kg / 19.86 pounds
9009.7 g / 88.4 N
strong
2 mm 3109 Gs
310.9 mT
6.42 kg / 14.15 pounds
6419.9 g / 63.0 N
strong
3 mm 2600 Gs
260.0 mT
4.49 kg / 9.90 pounds
4488.7 g / 44.0 N
strong
5 mm 1818 Gs
181.8 mT
2.20 kg / 4.84 pounds
2195.3 g / 21.5 N
strong
10 mm 825 Gs
82.5 mT
0.45 kg / 1.00 pounds
452.4 g / 4.4 N
low risk
15 mm 431 Gs
43.1 mT
0.12 kg / 0.27 pounds
123.4 g / 1.2 N
low risk
20 mm 248 Gs
24.8 mT
0.04 kg / 0.09 pounds
41.0 g / 0.4 N
low risk
30 mm 101 Gs
10.1 mT
0.01 kg / 0.02 pounds
6.8 g / 0.1 N
low risk
50 mm 28 Gs
2.8 mT
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
low risk

Table 2: Shear hold (vertical surface)
MPL 30x10x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.43 kg / 5.35 pounds
2426.0 g / 23.8 N
1 mm Stal (~0.2) 1.80 kg / 3.97 pounds
1802.0 g / 17.7 N
2 mm Stal (~0.2) 1.28 kg / 2.83 pounds
1284.0 g / 12.6 N
3 mm Stal (~0.2) 0.90 kg / 1.98 pounds
898.0 g / 8.8 N
5 mm Stal (~0.2) 0.44 kg / 0.97 pounds
440.0 g / 4.3 N
10 mm Stal (~0.2) 0.09 kg / 0.20 pounds
90.0 g / 0.9 N
15 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Wall mounting (sliding) - vertical pull
MPL 30x10x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.64 kg / 8.02 pounds
3639.0 g / 35.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.43 kg / 5.35 pounds
2426.0 g / 23.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.21 kg / 2.67 pounds
1213.0 g / 11.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.07 kg / 13.37 pounds
6065.0 g / 59.5 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 30x10x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.61 kg / 1.34 pounds
606.5 g / 5.9 N
1 mm
13%
1.52 kg / 3.34 pounds
1516.3 g / 14.9 N
2 mm
25%
3.03 kg / 6.69 pounds
3032.5 g / 29.7 N
3 mm
38%
4.55 kg / 10.03 pounds
4548.8 g / 44.6 N
5 mm
63%
7.58 kg / 16.71 pounds
7581.3 g / 74.4 N
10 mm
100%
12.13 kg / 26.74 pounds
12130.0 g / 119.0 N
11 mm
100%
12.13 kg / 26.74 pounds
12130.0 g / 119.0 N
12 mm
100%
12.13 kg / 26.74 pounds
12130.0 g / 119.0 N

Table 5: Thermal resistance (material behavior) - power drop
MPL 30x10x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 12.13 kg / 26.74 pounds
12130.0 g / 119.0 N
OK
40 °C -2.2% 11.86 kg / 26.15 pounds
11863.1 g / 116.4 N
OK
60 °C -4.4% 11.60 kg / 25.57 pounds
11596.3 g / 113.8 N
80 °C -6.6% 11.33 kg / 24.98 pounds
11329.4 g / 111.1 N
100 °C -28.8% 8.64 kg / 19.04 pounds
8636.6 g / 84.7 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 30x10x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 33.78 kg / 74.46 pounds
5 382 Gs
5.07 kg / 11.17 pounds
5066 g / 49.7 N
N/A
1 mm 29.33 kg / 64.66 pounds
7 964 Gs
4.40 kg / 9.70 pounds
4399 g / 43.2 N
26.39 kg / 58.19 pounds
~0 Gs
2 mm 25.09 kg / 55.31 pounds
7 366 Gs
3.76 kg / 8.30 pounds
3763 g / 36.9 N
22.58 kg / 49.78 pounds
~0 Gs
3 mm 21.25 kg / 46.85 pounds
6 780 Gs
3.19 kg / 7.03 pounds
3188 g / 31.3 N
19.13 kg / 42.17 pounds
~0 Gs
5 mm 14.97 kg / 32.99 pounds
5 689 Gs
2.24 kg / 4.95 pounds
2245 g / 22.0 N
13.47 kg / 29.70 pounds
~0 Gs
10 mm 6.11 kg / 13.48 pounds
3 636 Gs
0.92 kg / 2.02 pounds
917 g / 9.0 N
5.50 kg / 12.13 pounds
~0 Gs
20 mm 1.26 kg / 2.78 pounds
1 651 Gs
0.19 kg / 0.42 pounds
189 g / 1.9 N
1.13 kg / 2.50 pounds
~0 Gs
50 mm 0.04 kg / 0.10 pounds
308 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
0.04 kg / 0.09 pounds
~0 Gs
60 mm 0.02 kg / 0.04 pounds
203 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.04 pounds
~0 Gs
70 mm 0.01 kg / 0.02 pounds
140 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
100 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
74 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
56 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Protective zones (electronics) - warnings
MPL 30x10x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.5 cm
Hearing aid 10 Gs (1.0 mT) 7.5 cm
Mechanical watch 20 Gs (2.0 mT) 6.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Dynamics (kinetic energy) - warning
MPL 30x10x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 26.78 km/h
(7.44 m/s)
0.50 J
30 mm 45.36 km/h
(12.60 m/s)
1.43 J
50 mm 58.54 km/h
(16.26 m/s)
2.38 J
100 mm 82.79 km/h
(23.00 m/s)
4.76 J

Table 9: Corrosion resistance
MPL 30x10x8 / 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 30x10x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 12 138 Mx 121.4 µWb
Pc Coefficient 0.51 Low (Flat)

Table 11: Submerged application
MPL 30x10x8 / N38

Environment Effective steel pull Effect
Air (land) 12.13 kg Standard
Water (riverbed) 13.89 kg
(+1.76 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds only a fraction of its max power.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Power loss vs temp

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.51

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
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%
Sustainability
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: 020139-2026
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Magnet pull force

Magnetic Field

Check out also products

Component MPL 30x10x8 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 119.04 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating strong flat 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 12.13 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.
Plate magnets MPL 30x10x8 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
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 30x10x8 / N38 model is magnetized axially (dimension 8 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 (30x10 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 10 mm (width), and 8 mm (thickness). The key parameter here is the holding force amounting to approximately 12.13 kg (force ~119.04 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even during nearly ten years – the decrease in strength is only ~1% (based on measurements),
  • Neodymium magnets are exceptionally resistant to demagnetization caused by external magnetic fields,
  • By covering with a lustrous layer of nickel, the element gains an modern look,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in constructing and the ability to adapt to unusual requirements,
  • Significant place in innovative solutions – they are utilized in hard drives, electric drive systems, precision medical tools, and other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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 extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex forms.
  • Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Magnetic strength at its maximum – what it depends on?

Information about lifting capacity was determined for optimal configuration, taking into account:
  • on a plate made of structural steel, effectively closing the magnetic flux
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a surface perfectly flat
  • without the slightest insulating layer between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

In real-world applications, the actual holding force depends on many variables, ranked from crucial:
  • Air gap (betwixt the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Base massiveness – insufficiently thick plate causes magnetic saturation, causing part of the power to be escaped into the air.
  • Plate material – mild steel attracts best. Higher carbon content lower magnetic permeability and lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets
Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, immediately stop working with magnets and use protective gear.

Caution required

Be careful. Rare earth magnets attract from a distance and snap with huge force, often faster than you can move away.

Permanent damage

Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Pacemakers

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Keep away from children

NdFeB magnets are not suitable for play. Swallowing several magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and requires immediate surgery.

Mechanical processing

Powder generated during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Risk of cracking

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Hand protection

Risk of injury: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Precision electronics

A strong magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Do not bring magnets near a device to avoid breaking the sensors.

Protect data

Powerful magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Security! Want to know more? Check our post: Are neodymium magnets dangerous?