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MPL 30x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020143

GTIN/EAN: 5906301811497

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

22.5 g

Magnetization Direction

↑ axial

Load capacity

8.86 kg / 86.90 N

Magnetic Induction

220.03 mT / 2200 Gs

Coating

[NiCuNi] Nickel

technical parameters »

9.10 ZŁ with VAT / pcs + price for transport

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Technical of the product - MPL 30x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020143
GTIN/EAN 5906301811497
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 5 mm [±0,1 mm]
Weight 22.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.86 kg / 86.90 N
Magnetic Induction ~ ? 220.03 mT / 2200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x5 / 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 product - report

These values represent the outcome of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Real-world performance may differ. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
MPL 30x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2200 Gs
220.0 mT
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
 warning
1 mm 2092 Gs
209.2 mT
 8.01 kg / 17.67 lbs
8013.9 g / 78.6 N
 warning
2 mm 1961 Gs
196.1 mT
 7.04 kg / 15.53 lbs
7042.1 g / 69.1 N
 warning
3 mm 1817 Gs
181.7 mT
 6.04 kg / 13.32 lbs
6041.8 g / 59.3 N
 warning
5 mm 1516 Gs
151.6 mT
 4.21 kg / 9.28 lbs
4209.6 g / 41.3 N
 warning
10 mm 892 Gs
89.2 mT
 1.46 kg / 3.21 lbs
1456.2 g / 14.3 N
 low risk
15 mm 519 Gs
51.9 mT
 0.49 kg / 1.09 lbs
492.4 g / 4.8 N
 low risk
20 mm 313 Gs
31.3 mT
 0.18 kg / 0.40 lbs
179.8 g / 1.8 N
 low risk
30 mm 132 Gs
13.2 mT
 0.03 kg / 0.07 lbs
31.9 g / 0.3 N
 low risk
50 mm 37 Gs
3.7 mT
 0.00 kg / 0.01 lbs
2.5 g / 0.0 N
 low risk
Grip strength drops sharply per each millimeter of spacing. Keep in mind that every additional insulation layer (e.g., contamination, paint, rust) strongly weakens the grip. Magnets operate optimally during direct contact; air break drastically cuts the force. Observe how rapidly the load capacity fall, when the magnet does not adhere tightly to the metal substrate. When calculating the mounting, discard unnecessary gaps.

Table 2: Slippage force (vertical surface)
MPL 30x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.77 kg / 3.91 lbs
1772.0 g / 17.4 N
1 mm Stal (~0.2) 1.60 kg / 3.53 lbs
1602.0 g / 15.7 N
2 mm Stal (~0.2) 1.41 kg / 3.10 lbs
1408.0 g / 13.8 N
3 mm Stal (~0.2) 1.21 kg / 2.66 lbs
1208.0 g / 11.9 N
5 mm Stal (~0.2) 0.84 kg / 1.86 lbs
842.0 g / 8.3 N
10 mm Stal (~0.2) 0.29 kg / 0.64 lbs
292.0 g / 2.9 N
15 mm Stal (~0.2) 0.10 kg / 0.22 lbs
98.0 g / 1.0 N
20 mm Stal (~0.2) 0.04 kg / 0.08 lbs
36.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
This section presents the estimated shear load necessary to initiate the sliding of the magnet down against a vertical steel wall (considering standard friction coefficient). The holding force is relative to the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 30x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.66 kg / 5.86 lbs
2658.0 g / 26.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.77 kg / 3.91 lbs
1772.0 g / 17.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.89 kg / 1.95 lbs
886.0 g / 8.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
When hanging a magnet on a upright plane (e.g., a board), it will maintain only about 20%-30% of its maximum pull force. Gravity and a weak degree of grip cause that holders slip easier than they pop off the substrate. Designing a hanger? Consider that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will give way down under a significantly smaller cargo. Utilizing a rubberized pad can effectively raise the stability.

Table 4: Material efficiency (saturation) - power losses
MPL 30x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.89 kg / 1.95 lbs
886.0 g / 8.7 N
1 mm
25%
 2.22 kg / 4.88 lbs
2215.0 g / 21.7 N
2 mm
50%
 4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
3 mm
75%
 6.65 kg / 14.65 lbs
6645.0 g / 65.2 N
5 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
10 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
11 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
12 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
A thin metal plate is not enough to take in the entire magnetic field, which wastes potential of the magnet. If you install a neodymium to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To achieve 100% of this neodymium's potential, you require a sufficiently solid backing of steel. The material oversaturation causes that on delicate walls (e.g., thin profiles), the holder shows lower pull force. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal resistance (material behavior) - power drop
MPL 30x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
 OK
40 °C -2.2% 8.67 kg / 19.10 lbs
8665.1 g / 85.0 N
 OK
60 °C -4.4% 8.47 kg / 18.67 lbs
8470.2 g / 83.1 N
80 °C -6.6% 8.28 kg / 18.24 lbs
8275.2 g / 81.2 N
100 °C -28.8% 6.31 kg / 13.91 lbs
6308.3 g / 61.9 N
Standard neodymium magnets lose strength after exceeding the maximum temperature. Protect against heat – heat can irreversibly destroy this magnet. With increasing heat, the magnet's power briefly drops. Refrain from using this magnet close to ovens higher than its working range. Too high temperature will result in irreversible degradation of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 30x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.90 kg / 39.47 lbs
3 715 Gs
2.69 kg / 5.92 lbs
2685 g / 26.3 N
 N/A
1 mm 17.10 kg / 37.69 lbs
4 300 Gs
2.56 kg / 5.65 lbs
2565 g / 25.2 N
 15.39 kg / 33.92 lbs
~0 Gs
2 mm 16.19 kg / 35.70 lbs
4 184 Gs
2.43 kg / 5.35 lbs
2429 g / 23.8 N
 14.57 kg / 32.13 lbs
~0 Gs
3 mm 15.23 kg / 33.57 lbs
4 058 Gs
2.28 kg / 5.04 lbs
2284 g / 22.4 N
 13.71 kg / 30.22 lbs
~0 Gs
5 mm 13.22 kg / 29.14 lbs
3 780 Gs
1.98 kg / 4.37 lbs
1982 g / 19.4 N
 11.89 kg / 26.22 lbs
~0 Gs
10 mm 8.51 kg / 18.75 lbs
3 033 Gs
1.28 kg / 2.81 lbs
1276 g / 12.5 N
 7.66 kg / 16.88 lbs
~0 Gs
20 mm 2.94 kg / 6.49 lbs
1 784 Gs
0.44 kg / 0.97 lbs
441 g / 4.3 N
 2.65 kg / 5.84 lbs
~0 Gs
50 mm 0.15 kg / 0.32 lbs
398 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
 0.13 kg / 0.29 lbs
~0 Gs
60 mm 0.06 kg / 0.14 lbs
264 Gs
0.01 kg / 0.02 lbs
10 g / 0.1 N
 0.06 kg / 0.13 lbs
~0 Gs
70 mm 0.03 kg / 0.07 lbs
183 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
80 mm 0.02 kg / 0.04 lbs
131 Gs
0.00 kg / 0.01 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
90 mm 0.01 kg / 0.02 lbs
97 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.01 lbs
73 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and steel combination. The setup of two magnets creates a more powerful interaction and a further horizon of operation. Want to build a powerful holder? Apply two magnets instead of a neodymium and a steel. Be careful that when bringing together two magnets, the collision energy is huge. The levitation is marginally weaker than the connection force, but still large.
*The magnetic induction between like poles reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).
Attention: Estimates show sliding force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - warnings
MPL 30x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Timepiece 20 Gs (2.0 mT) 6.5 cm
Mobile device 40 Gs (4.0 mT) 5.0 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 is a serious hazard to IT equipment and medical implants. These magnets generate a field that destroys function of digital equipment. Be aware: the invisible magnetic field penetrates the body and plastic. Special caution must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MPL 30x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.97 km/h
(6.10 m/s)
 0.42 J
30 mm 34.74 km/h
(9.65 m/s)
 1.05 J
50 mm 44.76 km/h
(12.43 m/s)
 1.74 J
100 mm 63.29 km/h
(17.58 m/s)
 3.48 J
Magnetic elements are very brittle – a collision with steel can result in shattering. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can trigger coating fragments or dangerous crushing to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 30x20x5 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MPL 30x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 969 Mx 149.7 µWb
Pc Coefficient 0.26 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MPL 30x20x5 / N38

Environment Effective steel pull Effect
Air (land) 8.86 kg Standard
Water (riverbed) 10.14 kg
(+1.28 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.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains only a fraction of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

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.

Technical specification and ecology
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: 020143-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 30x20x5 mm and a weight of 22.5 g, guarantees the highest quality connection. As a block magnet with high power (approx. 8.86 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 30x20x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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.
They constitute a key element in the production of generators and material handling systems. Thanks to the flat surface and high force (approx. 8.86 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 30x20x5 / N38, we recommend utilizing strong epoxy glues (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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 30x20x5 mm, which, at a weight of 22.5 g, makes it an element with high energy density. It is a magnetic block with dimensions 30x20x5 mm and a self-weight of 22.5 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 neodymium magnets.

Strengths

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They do not lose magnetism, even during nearly 10 years – the decrease in power is only ~1% (theoretically),
  • They possess excellent resistance to magnetism drop due to opposing magnetic fields,
  • Thanks to the elegant finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an modern appearance,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Thanks to versatility in forming and the capacity to adapt to specific needs,
  • Significant place in future technologies – they find application in computer drives, electric motors, precision medical tools, as well as technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability 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, in case of application outdoors
  • Due to limitations in producing threads and complicated shapes in magnets, we recommend using a housing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these products can be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

The force parameter is a result of laboratory testing executed under the following configuration:
  • using a plate made of high-permeability steel, acting as a ideal flux conductor
  • whose thickness equals approx. 10 mm
  • with an ground touching surface
  • with zero gap (without coatings)
  • for force acting at a right angle (in the magnet axis)
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

In real-world applications, the real power results from many variables, presented from most significant:
  • Distance (betwixt the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Steel grade – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Shattering risk

Neodymium magnets are sintered ceramics, which means they are very brittle. Collision of two magnets will cause them shattering into shards.

Heat warning

Keep cool. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

GPS Danger

Remember: neodymium magnets generate a field that interferes with precision electronics. Keep a separation from your mobile, tablet, and navigation systems.

Crushing force

Big blocks can smash fingers instantly. Never place your hand betwixt two strong magnets.

Allergic reactions

It is widely known that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact or choose versions in plastic housing.

Dust explosion hazard

Drilling and cutting of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Magnetic media

Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Safe operation

Handle magnets consciously. Their powerful strength can surprise even professionals. Be vigilant and do not underestimate their force.

Danger to the youngest

NdFeB magnets are not suitable for play. Accidental ingestion of several magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and requires immediate surgery.

Danger to pacemakers

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Caution! Details about risks in the article: Magnet Safety Guide.