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MPL 30x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020142

GTIN/EAN: 5906301811480

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

90 g

Magnetization Direction

↑ axial

Load capacity

24.27 kg / 238.07 N

Magnetic Induction

512.53 mT / 5125 Gs

Coating

[NiCuNi] Nickel

43.22 with VAT / pcs + price for transport

35.14 ZŁ net + 23% VAT / pcs

bulk discounts:

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Parameters along with appearance of a neodymium magnet can be analyzed using our our magnetic calculator.

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Technical details - MPL 30x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020142
GTIN/EAN 5906301811480
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 20 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 90 g
Magnetization Direction ↑ axial
Load capacity ~ ? 24.27 kg / 238.07 N
Magnetic Induction ~ ? 512.53 mT / 5125 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x20 / 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 modeling of the assembly - technical parameters

Presented information constitute the outcome of a engineering analysis. Values are based on algorithms for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - interaction chart
MPL 30x20x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5124 Gs
512.4 mT
24.27 kg / 53.51 lbs
24270.0 g / 238.1 N
critical level
1 mm 4730 Gs
473.0 mT
20.68 kg / 45.60 lbs
20685.0 g / 202.9 N
critical level
2 mm 4335 Gs
433.5 mT
17.37 kg / 38.30 lbs
17370.7 g / 170.4 N
critical level
3 mm 3950 Gs
395.0 mT
14.43 kg / 31.80 lbs
14425.2 g / 141.5 N
critical level
5 mm 3240 Gs
324.0 mT
9.71 kg / 21.40 lbs
9706.2 g / 95.2 N
warning
10 mm 1923 Gs
192.3 mT
3.42 kg / 7.53 lbs
3417.4 g / 33.5 N
warning
15 mm 1163 Gs
116.3 mT
1.25 kg / 2.76 lbs
1250.2 g / 12.3 N
safe
20 mm 736 Gs
73.6 mT
0.50 kg / 1.10 lbs
500.4 g / 4.9 N
safe
30 mm 338 Gs
33.8 mT
0.11 kg / 0.23 lbs
105.3 g / 1.0 N
safe
50 mm 106 Gs
10.6 mT
0.01 kg / 0.02 lbs
10.3 g / 0.1 N
safe

Table 2: Sliding force (wall)
MPL 30x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.85 kg / 10.70 lbs
4854.0 g / 47.6 N
1 mm Stal (~0.2) 4.14 kg / 9.12 lbs
4136.0 g / 40.6 N
2 mm Stal (~0.2) 3.47 kg / 7.66 lbs
3474.0 g / 34.1 N
3 mm Stal (~0.2) 2.89 kg / 6.36 lbs
2886.0 g / 28.3 N
5 mm Stal (~0.2) 1.94 kg / 4.28 lbs
1942.0 g / 19.1 N
10 mm Stal (~0.2) 0.68 kg / 1.51 lbs
684.0 g / 6.7 N
15 mm Stal (~0.2) 0.25 kg / 0.55 lbs
250.0 g / 2.5 N
20 mm Stal (~0.2) 0.10 kg / 0.22 lbs
100.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N

Table 3: Wall mounting (sliding) - vertical pull
MPL 30x20x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.28 kg / 16.05 lbs
7281.0 g / 71.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.85 kg / 10.70 lbs
4854.0 g / 47.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.43 kg / 5.35 lbs
2427.0 g / 23.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.14 kg / 26.75 lbs
12135.0 g / 119.0 N

Table 4: Steel thickness (substrate influence) - power losses
MPL 30x20x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.21 kg / 2.68 lbs
1213.5 g / 11.9 N
1 mm
13%
3.03 kg / 6.69 lbs
3033.8 g / 29.8 N
2 mm
25%
6.07 kg / 13.38 lbs
6067.5 g / 59.5 N
3 mm
38%
9.10 kg / 20.06 lbs
9101.3 g / 89.3 N
5 mm
63%
15.17 kg / 33.44 lbs
15168.8 g / 148.8 N
10 mm
100%
24.27 kg / 53.51 lbs
24270.0 g / 238.1 N
11 mm
100%
24.27 kg / 53.51 lbs
24270.0 g / 238.1 N
12 mm
100%
24.27 kg / 53.51 lbs
24270.0 g / 238.1 N

Table 5: Working in heat (stability) - power drop
MPL 30x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.27 kg / 53.51 lbs
24270.0 g / 238.1 N
OK
40 °C -2.2% 23.74 kg / 52.33 lbs
23736.1 g / 232.9 N
OK
60 °C -4.4% 23.20 kg / 51.15 lbs
23202.1 g / 227.6 N
OK
80 °C -6.6% 22.67 kg / 49.97 lbs
22668.2 g / 222.4 N
100 °C -28.8% 17.28 kg / 38.10 lbs
17280.2 g / 169.5 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 30x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 97.11 kg / 214.09 lbs
5 859 Gs
14.57 kg / 32.11 lbs
14567 g / 142.9 N
N/A
1 mm 89.88 kg / 198.15 lbs
9 859 Gs
13.48 kg / 29.72 lbs
13482 g / 132.3 N
80.89 kg / 178.34 lbs
~0 Gs
2 mm 82.77 kg / 182.47 lbs
9 461 Gs
12.42 kg / 27.37 lbs
12415 g / 121.8 N
74.49 kg / 164.22 lbs
~0 Gs
3 mm 75.96 kg / 167.47 lbs
9 063 Gs
11.39 kg / 25.12 lbs
11394 g / 111.8 N
68.37 kg / 150.72 lbs
~0 Gs
5 mm 63.42 kg / 139.81 lbs
8 281 Gs
9.51 kg / 20.97 lbs
9513 g / 93.3 N
57.08 kg / 125.83 lbs
~0 Gs
10 mm 38.84 kg / 85.62 lbs
6 481 Gs
5.83 kg / 12.84 lbs
5826 g / 57.1 N
34.95 kg / 77.06 lbs
~0 Gs
20 mm 13.67 kg / 30.15 lbs
3 845 Gs
2.05 kg / 4.52 lbs
2051 g / 20.1 N
12.31 kg / 27.13 lbs
~0 Gs
50 mm 0.88 kg / 1.94 lbs
976 Gs
0.13 kg / 0.29 lbs
132 g / 1.3 N
0.79 kg / 1.75 lbs
~0 Gs
60 mm 0.42 kg / 0.93 lbs
675 Gs
0.06 kg / 0.14 lbs
63 g / 0.6 N
0.38 kg / 0.84 lbs
~0 Gs
70 mm 0.22 kg / 0.48 lbs
484 Gs
0.03 kg / 0.07 lbs
33 g / 0.3 N
0.20 kg / 0.43 lbs
~0 Gs
80 mm 0.12 kg / 0.26 lbs
358 Gs
0.02 kg / 0.04 lbs
18 g / 0.2 N
0.11 kg / 0.24 lbs
~0 Gs
90 mm 0.07 kg / 0.15 lbs
272 Gs
0.01 kg / 0.02 lbs
10 g / 0.1 N
0.06 kg / 0.14 lbs
~0 Gs
100 mm 0.04 kg / 0.09 lbs
211 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
0.04 kg / 0.08 lbs
~0 Gs

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 30x20x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.0 cm
Hearing aid 10 Gs (1.0 mT) 12.5 cm
Mechanical watch 20 Gs (2.0 mT) 10.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.5 cm
Remote 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm

Table 8: Impact energy (cracking risk) - collision effects
MPL 30x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.96 km/h
(4.99 m/s)
1.12 J
30 mm 28.76 km/h
(7.99 m/s)
2.87 J
50 mm 37.04 km/h
(10.29 m/s)
4.76 J
100 mm 52.37 km/h
(14.55 m/s)
9.52 J

Table 9: Coating parameters (durability)
MPL 30x20x20 / 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 (Flux)
MPL 30x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 30 878 Mx 308.8 µWb
Pc Coefficient 0.74 High (Stable)

Table 11: Underwater work (magnet fishing)
MPL 30x20x20 / N38

Environment Effective steel pull Effect
Air (land) 24.27 kg Standard
Water (riverbed) 27.79 kg
(+3.52 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. Sliding resistance

*Warning: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) drastically 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) = 0.74

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: 020142-2026
Measurement Calculator
Pulling force

Magnetic Field

View also offers

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x20x20 mm and a weight of 90 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 24.27 kg), this product is available immediately from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating secures 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 24.27 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. 24.27 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 30x20x20 / 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. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (30x20 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), 20 mm (width), and 20 mm (thickness). The key parameter here is the holding force amounting to approximately 24.27 kg (force ~238.07 N), which, with such a compact 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

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • They do not lose their magnetic properties even under strong external field,
  • The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in forming and the capacity to modify to individual projects,
  • Universal use in innovative solutions – they find application in magnetic memories, drive modules, diagnostic systems, also modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Limited possibility of creating threads in the magnet and complicated shapes - preferred is casing - magnetic holder.
  • Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these products can complicate diagnosis medical after entering the body.
  • 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

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

The force parameter is a result of laboratory testing executed under standard conditions:
  • with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with a plane cleaned and smooth
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction perpendicular to the plane
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

In real-world applications, the actual holding force depends on many variables, presented from crucial:
  • Air gap (between the magnet and the plate), as even a tiny distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal environment – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the load capacity.

H&S for magnets
ICD Warning

Individuals with a heart stimulator have to keep an absolute distance from magnets. The magnetism can disrupt the operation of the life-saving device.

Dust is flammable

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Eye protection

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

Hand protection

Watch your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Be careful!

Immense force

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Impact on smartphones

GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.

Maximum temperature

Avoid heat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Electronic devices

Powerful magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Keep away from children

Absolutely keep magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are tragic.

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, cease handling magnets and wear gloves.

Caution! Details about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98