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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

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10.23 ZŁ with VAT / pcs + price for transport

8.32 ZŁ net + 23% VAT / pcs

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Technical details - 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 product - technical parameters

The following data constitute the outcome of a mathematical calculation. Values were calculated on algorithms for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force 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 lbs
6300.0 g / 61.8 N
 medium risk
1 mm 1728 Gs
172.8 mT
 5.77 kg / 12.72 lbs
5771.5 g / 56.6 N
 medium risk
2 mm 1628 Gs
162.8 mT
 5.13 kg / 11.30 lbs
5125.7 g / 50.3 N
 medium risk
3 mm 1515 Gs
151.5 mT
 4.43 kg / 9.78 lbs
4434.6 g / 43.5 N
 medium risk
5 mm 1271 Gs
127.1 mT
 3.12 kg / 6.89 lbs
3124.3 g / 30.6 N
 medium risk
10 mm 751 Gs
75.1 mT
 1.09 kg / 2.40 lbs
1088.7 g / 10.7 N
 weak grip
15 mm 435 Gs
43.5 mT
 0.37 kg / 0.81 lbs
366.3 g / 3.6 N
 weak grip
20 mm 262 Gs
26.2 mT
 0.13 kg / 0.29 lbs
132.6 g / 1.3 N
 weak grip
30 mm 110 Gs
11.0 mT
 0.02 kg / 0.05 lbs
23.2 g / 0.2 N
 weak grip
50 mm 30 Gs
3.0 mT
 0.00 kg / 0.00 lbs
1.8 g / 0.0 N
 weak grip
Magnetic force decreases sharply with every mm of gap. Keep in mind that even the smallest gap (e.g., contamination, paint, dust) strongly diminishes the holding power. Magnetic products work optimally during direct contact; gap drastically cuts the force. Analyze how quickly the pull force drop, when the magnet does not adhere tightly to the metal substrate. When designing the mounting, eliminate redundant distances.

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.26 kg / 2.78 lbs
1260.0 g / 12.4 N
1 mm Stal (~0.2) 1.15 kg / 2.54 lbs
1154.0 g / 11.3 N
2 mm Stal (~0.2) 1.03 kg / 2.26 lbs
1026.0 g / 10.1 N
3 mm Stal (~0.2) 0.89 kg / 1.95 lbs
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.62 kg / 1.38 lbs
624.0 g / 6.1 N
10 mm Stal (~0.2) 0.22 kg / 0.48 lbs
218.0 g / 2.1 N
15 mm Stal (~0.2) 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 lbs
26.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The following data shows the theoretical weight limit sufficient to start the sliding of the magnet downwards on a upright metal surface (considering typical friction coefficient). The holding force is relative to the air gap 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 lbs
1890.0 g / 18.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.26 kg / 2.78 lbs
1260.0 g / 12.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.63 kg / 1.39 lbs
630.0 g / 6.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.15 kg / 6.94 lbs
3150.0 g / 30.9 N
When mounting a magnet on a upright surface (e.g., a car body), it will maintain barely about 1/5 of nominal attraction strength. Gravity and a low friction coefficient cause that magnets slip faster than they pull off. Planning a wall mount? Note that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the holder will give way down under a significantly smaller load. Utilizing a rubberized layer can effectively improve the result.

Table 4: Material efficiency (saturation) - 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 lbs
630.0 g / 6.2 N
1 mm
25%
 1.58 kg / 3.47 lbs
1575.0 g / 15.5 N
2 mm
50%
 3.15 kg / 6.94 lbs
3150.0 g / 30.9 N
3 mm
75%
 4.73 kg / 10.42 lbs
4725.0 g / 46.4 N
5 mm
100%
 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
10 mm
100%
 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
11 mm
100%
 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
12 mm
100%
 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
A thin metal plate is not enough to take in the entire magnetic field, which wastes potential of the magnet. If you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To utilize 100% of this neodymium's power, you need a suitably thick backing of metal. The saturation effect causes that on thin elements (e.g., car bodies), the magnet shows lower pull force. We suggest choosing the steel thickness based on the following data.

Table 5: Working in heat (stability) - thermal limit
MPL 30x20x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
 OK
40 °C -2.2% 6.16 kg / 13.58 lbs
6161.4 g / 60.4 N
 OK
60 °C -4.4% 6.02 kg / 13.28 lbs
6022.8 g / 59.1 N
80 °C -6.6% 5.88 kg / 12.97 lbs
5884.2 g / 57.7 N
100 °C -28.8% 4.49 kg / 9.89 lbs
4485.6 g / 44.0 N
Standard neodymium magnets change their properties strength above the temperature limit. Watch out for overheating – heat can irreversibly damage this product. As the temperature rises, the magnet's capacity momentarily drops. Do not use this product in hot environments higher than its safe range. Exceeding the critical threshold will result in destruction of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) may lose charge permanently sooner compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field range
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 lbs
3 198 Gs
1.81 kg / 3.99 lbs
1809 g / 17.7 N
 N/A
1 mm 11.59 kg / 25.55 lbs
3 540 Gs
1.74 kg / 3.83 lbs
1739 g / 17.1 N
 10.43 kg / 23.00 lbs
~0 Gs
2 mm 11.05 kg / 24.35 lbs
3 456 Gs
1.66 kg / 3.65 lbs
1657 g / 16.3 N
 9.94 kg / 21.92 lbs
~0 Gs
3 mm 10.45 kg / 23.03 lbs
3 361 Gs
1.57 kg / 3.45 lbs
1567 g / 15.4 N
 9.40 kg / 20.73 lbs
~0 Gs
5 mm 9.15 kg / 20.18 lbs
3 146 Gs
1.37 kg / 3.03 lbs
1373 g / 13.5 N
 8.24 kg / 18.16 lbs
~0 Gs
10 mm 5.98 kg / 13.18 lbs
2 543 Gs
0.90 kg / 1.98 lbs
897 g / 8.8 N
 5.38 kg / 11.86 lbs
~0 Gs
20 mm 2.08 kg / 4.59 lbs
1 501 Gs
0.31 kg / 0.69 lbs
313 g / 3.1 N
 1.88 kg / 4.13 lbs
~0 Gs
50 mm 0.10 kg / 0.22 lbs
331 Gs
0.02 kg / 0.03 lbs
15 g / 0.1 N
 0.09 kg / 0.20 lbs
~0 Gs
60 mm 0.04 kg / 0.10 lbs
219 Gs
0.01 kg / 0.01 lbs
7 g / 0.1 N
 0.04 kg / 0.09 lbs
~0 Gs
70 mm 0.02 kg / 0.05 lbs
151 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
80 mm 0.01 kg / 0.02 lbs
108 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
90 mm 0.01 kg / 0.01 lbs
80 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
60 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets interact from a much further distance than a neodymium and metal setup. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of action. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is huge. The levitation is slightly lower than the attraction, but still large.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Important: Results demonstrate friction force of a pair of same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - 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
Phone / Smartphone 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
Extremely neodym field is a real danger to IT equipment and medical implants. These neodymiums generate a flux that destroys function of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
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
NdFeB products are prone to chipping – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Coating parameters (durability)
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 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 (Pc)
MPL 30x20x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 12 775 Mx 127.8 µWb
Pc Coefficient 0.22 Low (Flat)
Flux value passing through the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
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. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds merely approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Temperature resistance

*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) = 0.22

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.

Engineering data and GPSR
Chemical composition
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: 020286-2026
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Component MPL 30x20x4 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a block magnet 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 shifting 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. 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 generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 30x20x4 / 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.
Standardly, the MPL 30x20x4 / N38 model is magnetized through the thickness (dimension 4 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 (30x20 mm), which is ideal for flat mounting. 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), 20 mm (width), and 4 mm (thickness). 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.

Strengths and weaknesses of neodymium magnets.

Strengths

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They do not lose strength, even over nearly 10 years – the reduction in power is only ~1% (based on measurements),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • By using a reflective layer of silver, the element gains an aesthetic look,
  • Magnetic induction on the surface of the magnet turns out to be exceptional,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Considering the option of flexible molding and customization to custom needs, NdFeB magnets can be produced in a wide range of forms and dimensions, which expands the range of possible applications,
  • Versatile presence in electronics industry – they are utilized in hard drives, drive modules, medical equipment, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

What to avoid - cons of neodymium magnets: tips and applications.
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing threads in the magnet and complex forms - recommended is a housing - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Additionally, small components of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Pull force analysis

Maximum lifting capacity of the magnet – what contributes to it?

The load parameter shown concerns the limit force, recorded under laboratory conditions, specifically:
  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • whose transverse dimension equals approx. 10 mm
  • with an ideally smooth contact surface
  • without the slightest air gap between the magnet and steel
  • under perpendicular force direction (90-degree angle)
  • at temperature room level

What influences lifting capacity in practice

During everyday use, the actual holding force is determined by many variables, listed from most significant:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was assessed with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
ICD Warning

Life threat: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Magnet fragility

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets will cause them breaking into small pieces.

Crushing risk

Pinching hazard: The attraction force is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Keep away from electronics

An intense magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Do not bring magnets close to a device to prevent breaking the sensors.

Thermal limits

Control the heat. Heating the magnet to high heat will destroy its magnetic structure and pulling force.

Handling guide

Before use, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Adults only

Product intended for adults. Small elements pose a choking risk, causing serious injuries. Keep out of reach of children and animals.

Allergic reactions

Some people experience a sensitization to nickel, which is the common plating for neodymium magnets. Extended handling might lead to skin redness. We strongly advise wear safety gloves.

Flammability

Dust generated during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Magnetic media

Avoid bringing magnets near a purse, computer, or screen. The magnetism can destroy these devices and erase data from cards.

Attention! Need more info? Read our article: Why are neodymium magnets dangerous?