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MPL 30x20x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020286

GTIN/EAN: 5906301811848

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

18 g

Magnetization Direction

↑ axial

Load capacity

6.30 kg / 61.84 N

Magnetic Induction

180.57 mT / 1806 Gs

Coating

[NiCuNi] Nickel

product parameters »

10.23 ZŁ with VAT / pcs + price for transport

8.32 ZŁ net + 23% VAT / pcs

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Force along with form of a magnet can be tested using our magnetic mass calculator.

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Detailed specification - MPL 30x20x4 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020286
GTIN/EAN 5906301811848
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 4 mm [±0,1 mm]
Weight 18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.30 kg / 61.84 N
Magnetic Induction ~ ? 180.57 mT / 1806 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x4 / 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

Technical modeling of the assembly - report

These data represent the result of a physical analysis. Results are based on algorithms for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Treat these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
MPL 30x20x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1805 Gs
180.5 mT
 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
 medium risk
1 mm 1728 Gs
172.8 mT
 5.77 kg / 12.72 pounds
5771.5 g / 56.6 N
 medium risk
2 mm 1628 Gs
162.8 mT
 5.13 kg / 11.30 pounds
5125.7 g / 50.3 N
 medium risk
3 mm 1515 Gs
151.5 mT
 4.43 kg / 9.78 pounds
4434.6 g / 43.5 N
 medium risk
5 mm 1271 Gs
127.1 mT
 3.12 kg / 6.89 pounds
3124.3 g / 30.6 N
 medium risk
10 mm 751 Gs
75.1 mT
 1.09 kg / 2.40 pounds
1088.7 g / 10.7 N
 low risk
15 mm 435 Gs
43.5 mT
 0.37 kg / 0.81 pounds
366.3 g / 3.6 N
 low risk
20 mm 262 Gs
26.2 mT
 0.13 kg / 0.29 pounds
132.6 g / 1.3 N
 low risk
30 mm 110 Gs
11.0 mT
 0.02 kg / 0.05 pounds
23.2 g / 0.2 N
 low risk
50 mm 30 Gs
3.0 mT
 0.00 kg / 0.00 pounds
1.8 g / 0.0 N
 low risk
Pulling power drops significantly with every mm of distance. Note that even a very thin break (e.g., contamination, paint, veneer) noticeably diminishes the holding power. Magnetic products work strongest during direct contact; gap drastically cuts the power. See how quickly the parameters fall, when the magnet does not adhere flatly to the steel surface. When calculating the mounting, discard additional spacers.

Table 2: Slippage load (wall)
MPL 30x20x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.26 kg / 2.78 pounds
1260.0 g / 12.4 N
1 mm Stal (~0.2) 1.15 kg / 2.54 pounds
1154.0 g / 11.3 N
2 mm Stal (~0.2) 1.03 kg / 2.26 pounds
1026.0 g / 10.1 N
3 mm Stal (~0.2) 0.89 kg / 1.95 pounds
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.62 kg / 1.38 pounds
624.0 g / 6.1 N
10 mm Stal (~0.2) 0.22 kg / 0.48 pounds
218.0 g / 2.1 N
15 mm Stal (~0.2) 0.07 kg / 0.16 pounds
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 pounds
26.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below calculates the approximate weight limit necessary to initiate the sliding of the magnet downwards on a vertical steel plate (considering typical friction coefficient). This value is a function of the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MPL 30x20x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.26 kg / 2.78 pounds
1260.0 g / 12.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.63 kg / 1.39 pounds
630.0 g / 6.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.15 kg / 6.94 pounds
3150.0 g / 30.9 N
When hanging a holder on a upright surface (e.g., a fridge), it you can count on barely about 20%-30% of its nominal power. Gravitational force as well as a low friction coefficient mean that magnets slip faster than they pop off the substrate. Planning a hanger? Note that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will give way down under a significantly smaller weight. Utilizing a rubberized pad can drastically improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MPL 30x20x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.63 kg / 1.39 pounds
630.0 g / 6.2 N
1 mm
25%
 1.58 kg / 3.47 pounds
1575.0 g / 15.5 N
2 mm
50%
 3.15 kg / 6.94 pounds
3150.0 g / 30.9 N
3 mm
75%
 4.73 kg / 10.42 pounds
4725.0 g / 46.4 N
5 mm
100%
 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
10 mm
100%
 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
11 mm
100%
 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
12 mm
100%
 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
A thin sheet is unable to conduct the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the field will penetrate right through and the attraction force will be weaker. To achieve the maximum of this magnet's power, you require a sufficiently solid element of metal. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the product holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (stability) - power drop
MPL 30x20x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
 OK
40 °C -2.2% 6.16 kg / 13.58 pounds
6161.4 g / 60.4 N
 OK
60 °C -4.4% 6.02 kg / 13.28 pounds
6022.8 g / 59.1 N
80 °C -6.6% 5.88 kg / 12.97 pounds
5884.2 g / 57.7 N
100 °C -28.8% 4.49 kg / 9.89 pounds
4485.6 g / 44.0 N
Standard neodymium magnets irreversibly lose power after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently destroy this product. With every degree above norm, the magnet's force briefly lowers. Refrain from using this magnet close to heaters higher than its safe range. Too high temperature will result in permanent loss of magnetism.
*Engineering note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) may lose charge permanently at lower temperatures than long magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 30x20x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.06 kg / 26.58 pounds
3 198 Gs
1.81 kg / 3.99 pounds
1809 g / 17.7 N
 N/A
1 mm 11.59 kg / 25.55 pounds
3 540 Gs
1.74 kg / 3.83 pounds
1739 g / 17.1 N
 10.43 kg / 23.00 pounds
~0 Gs
2 mm 11.05 kg / 24.35 pounds
3 456 Gs
1.66 kg / 3.65 pounds
1657 g / 16.3 N
 9.94 kg / 21.92 pounds
~0 Gs
3 mm 10.45 kg / 23.03 pounds
3 361 Gs
1.57 kg / 3.45 pounds
1567 g / 15.4 N
 9.40 kg / 20.73 pounds
~0 Gs
5 mm 9.15 kg / 20.18 pounds
3 146 Gs
1.37 kg / 3.03 pounds
1373 g / 13.5 N
 8.24 kg / 18.16 pounds
~0 Gs
10 mm 5.98 kg / 13.18 pounds
2 543 Gs
0.90 kg / 1.98 pounds
897 g / 8.8 N
 5.38 kg / 11.86 pounds
~0 Gs
20 mm 2.08 kg / 4.59 pounds
1 501 Gs
0.31 kg / 0.69 pounds
313 g / 3.1 N
 1.88 kg / 4.13 pounds
~0 Gs
50 mm 0.10 kg / 0.22 pounds
331 Gs
0.02 kg / 0.03 pounds
15 g / 0.1 N
 0.09 kg / 0.20 pounds
~0 Gs
60 mm 0.04 kg / 0.10 pounds
219 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
 0.04 kg / 0.09 pounds
~0 Gs
70 mm 0.02 kg / 0.05 pounds
151 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
80 mm 0.01 kg / 0.02 pounds
108 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
90 mm 0.01 kg / 0.01 pounds
80 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.01 pounds
60 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a wider radius than a magnet and steel combination. Such a system of two magnets generates a stronger field and a wider radius of operation. Designing a solid fastener? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the pinch force is huge. The repulsion force is slightly lower than the attraction, but still impressive.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
Attention: Figures refer to shear force of a pair of matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - precautionary measures
MPL 30x20x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 7.5 cm
Mechanical watch 20 Gs (2.0 mT) 6.0 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a large risk to IT equipment as well as medical implants. These magnets generate a field that disrupts operation of digital equipment. Be aware: the invisible magnetic field acts through matter and housings. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MPL 30x20x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.81 km/h
(5.78 m/s)
 0.30 J
30 mm 32.75 km/h
(9.10 m/s)
 0.75 J
50 mm 42.20 km/h
(11.72 m/s)
 1.24 J
100 mm 59.66 km/h
(16.57 m/s)
 2.47 J
Neodymium magnets are prone to chipping – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during mounting so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Surface protection spec
MPL 30x20x4 / 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)
The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MPL 30x20x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 12 775 Mx 127.8 µWb
Pc Coefficient 0.22 Low (Flat)
Total magnetic flux emitted by the pole surface. Key data when building generators as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 30x20x4 / N38

Environment Effective steel pull Effect
Air (land) 6.30 kg Standard
Water (riverbed) 7.21 kg
(+0.91 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Shear force

*Warning: On a vertical wall, the magnet holds merely a fraction of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.22

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%
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: 020286-2026
Measurement Calculator
Magnet pull force
Field Strength
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Model MPL 30x20x4 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 6.30 kg), this product is available off-the-shelf from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
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. To separate the MPL 30x20x4 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 30x20x4 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 6.30 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. 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. 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.
This model is characterized by dimensions 30x20x4 mm, which, at a weight of 18 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 30x20x4 mm and a self-weight of 18 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of Nd2Fe14B magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their strength is maintained, and after around 10 years it decreases only by ~1% (theoretically),
  • Magnets perfectly defend themselves against loss of magnetization caused by foreign field sources,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in shaping and the capacity to modify to individual projects,
  • Huge importance in advanced technology sectors – they are used in HDD drives, drive modules, medical equipment, also industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets lose their strength 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 durability even at temperatures up to 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 immune to moisture, when using outdoors
  • Due to limitations in producing nuts and complicated forms in magnets, we recommend using casing - magnetic mount.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is relatively high,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what affects it?

Breakaway force was defined for the most favorable conditions, including:
  • using a base made of low-carbon steel, acting as a circuit closing element
  • possessing a massiveness of min. 10 mm to avoid saturation
  • with a plane perfectly flat
  • with zero gap (without impurities)
  • under perpendicular force vector (90-degree angle)
  • at conditions approx. 20°C

What influences lifting capacity in practice

Effective lifting capacity is affected by working environment parameters, such as (from most important):
  • Gap (betwixt the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and lifting capacity.
  • Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Temperature – heating the magnet results in weakening of force. Check the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets
Dust explosion hazard

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

Precision electronics

GPS units and smartphones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can ruin the internal compass in your phone.

Cards and drives

Avoid bringing magnets close to a purse, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Danger to pacemakers

Patients with a ICD have to maintain an safe separation from magnets. The magnetism can disrupt the functioning of the implant.

Swallowing risk

Absolutely store magnets away from children. Ingestion danger is high, and the effects of magnets connecting inside the body are life-threatening.

Permanent damage

Do not overheat. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Risk of cracking

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Safe operation

Handle magnets with awareness. Their powerful strength can surprise even professionals. Plan your moves and do not underestimate their force.

Crushing risk

Protect your hands. Two powerful magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Allergy Warning

Medical facts indicate that the nickel plating (the usual finish) is a potent allergen. If you have an allergy, avoid touching magnets with bare hands or choose coated magnets.

Danger! Need more info? Read our article: Are neodymium magnets dangerous?