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MPL 30x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020141

GTIN/EAN: 5906301811473

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

45 g

Magnetization Direction

↑ axial

Load capacity

19.53 kg / 191.55 N

Magnetic Induction

371.57 mT / 3716 Gs

Coating

[NiCuNi] Nickel

view technical specifications »

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Technical data - MPL 30x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020141
GTIN/EAN 5906301811473
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 10 mm [±0,1 mm]
Weight 45 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.53 kg / 191.55 N
Magnetic Induction ~ ? 371.57 mT / 3716 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x10 / 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 magnet - report

Presented information represent the direct effect of a physical analysis. Results rely on models for the class Nd2Fe14B. Real-world parameters might slightly differ. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (force vs distance) - power drop
MPL 30x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3715 Gs
371.5 mT
 19.53 kg / 43.06 lbs
19530.0 g / 191.6 N
 dangerous!
1 mm 3464 Gs
346.4 mT
 16.98 kg / 37.44 lbs
16983.1 g / 166.6 N
 dangerous!
2 mm 3197 Gs
319.7 mT
 14.47 kg / 31.89 lbs
14466.6 g / 141.9 N
 dangerous!
3 mm 2927 Gs
292.7 mT
 12.12 kg / 26.73 lbs
12123.3 g / 118.9 N
 dangerous!
5 mm 2408 Gs
240.8 mT
 8.21 kg / 18.10 lbs
8207.8 g / 80.5 N
 medium risk
10 mm 1411 Gs
141.1 mT
 2.82 kg / 6.21 lbs
2815.6 g / 27.6 N
 medium risk
15 mm 832 Gs
83.2 mT
 0.98 kg / 2.16 lbs
979.7 g / 9.6 N
 safe
20 mm 512 Gs
51.2 mT
 0.37 kg / 0.82 lbs
371.2 g / 3.6 N
 safe
30 mm 224 Gs
22.4 mT
 0.07 kg / 0.16 lbs
70.7 g / 0.7 N
 safe
50 mm 65 Gs
6.5 mT
 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
 safe
Pulling power drops drastically with every subsequent millimeter of gap. Remember that even a very thin break (e.g., dirt, varnish, dust) significantly weakens the grip. Magnetic products operate optimally during direct contact; distance kills the force. Notice how flashily the load capacity drop, when the magnet does not adhere directly to the steel surface. When calculating the arrangement, discard unnecessary gaps.

Table 2: Vertical load (wall)
MPL 30x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.91 kg / 8.61 lbs
3906.0 g / 38.3 N
1 mm Stal (~0.2) 3.40 kg / 7.49 lbs
3396.0 g / 33.3 N
2 mm Stal (~0.2) 2.89 kg / 6.38 lbs
2894.0 g / 28.4 N
3 mm Stal (~0.2) 2.42 kg / 5.34 lbs
2424.0 g / 23.8 N
5 mm Stal (~0.2) 1.64 kg / 3.62 lbs
1642.0 g / 16.1 N
10 mm Stal (~0.2) 0.56 kg / 1.24 lbs
564.0 g / 5.5 N
15 mm Stal (~0.2) 0.20 kg / 0.43 lbs
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
30 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
The table below shows the approximate weight limit required to initiate the slippage of the magnet vertically on a vertical steel wall (assuming standard friction coefficient). The holding force varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 30x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.86 kg / 12.92 lbs
5859.0 g / 57.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.91 kg / 8.61 lbs
3906.0 g / 38.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.95 kg / 4.31 lbs
1953.0 g / 19.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.77 kg / 21.53 lbs
9765.0 g / 95.8 N
When mounting a magnet on a vertical surface (e.g., a car body), it will only hold just approx. 20%-30% of its maximum pull force. Gravity as well as a weak degree of grip mean that magnets slide down easier than they pull off. Designing a wall mount? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a noticeably lighter load. Utilizing a rubberized coating can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 30x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.98 kg / 2.15 lbs
976.5 g / 9.6 N
1 mm
13%
 2.44 kg / 5.38 lbs
2441.3 g / 23.9 N
2 mm
25%
 4.88 kg / 10.76 lbs
4882.5 g / 47.9 N
3 mm
38%
 7.32 kg / 16.15 lbs
7323.8 g / 71.8 N
5 mm
63%
 12.21 kg / 26.91 lbs
12206.3 g / 119.7 N
10 mm
100%
 19.53 kg / 43.06 lbs
19530.0 g / 191.6 N
11 mm
100%
 19.53 kg / 43.06 lbs
19530.0 g / 191.6 N
12 mm
100%
 19.53 kg / 43.06 lbs
19530.0 g / 191.6 N
A thin sheet cannot focus the entire magnetic field, which weakens actual performance of the magnet. Should you mount a strong magnet to a too thin substrate, the field will pass right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's power, you need a suitably thick backing of metal. The saturation phenomenon means that on thin elements (e.g., thin profiles), the magnet shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Working in heat (stability) - power drop
MPL 30x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.53 kg / 43.06 lbs
19530.0 g / 191.6 N
 OK
40 °C -2.2% 19.10 kg / 42.11 lbs
19100.3 g / 187.4 N
 OK
60 °C -4.4% 18.67 kg / 41.16 lbs
18670.7 g / 183.2 N
80 °C -6.6% 18.24 kg / 40.21 lbs
18241.0 g / 178.9 N
100 °C -28.8% 13.91 kg / 30.66 lbs
13905.4 g / 136.4 N
Standard neodymium magnets lose parameters past the thermal threshold. Protect against heat – excessive heat can irreversibly damage this magnet. With increasing heat, the magnet's capacity briefly decreases. Refrain from using this magnet near heat sources higher than its operating temperature limit. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) may lose charge permanently under lower heat stress than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 30x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 51.05 kg / 112.54 lbs
5 124 Gs
7.66 kg / 16.88 lbs
7657 g / 75.1 N
 N/A
1 mm 47.76 kg / 105.28 lbs
7 186 Gs
7.16 kg / 15.79 lbs
7163 g / 70.3 N
 42.98 kg / 94.76 lbs
~0 Gs
2 mm 44.39 kg / 97.86 lbs
6 928 Gs
6.66 kg / 14.68 lbs
6658 g / 65.3 N
 39.95 kg / 88.08 lbs
~0 Gs
3 mm 41.06 kg / 90.52 lbs
6 663 Gs
6.16 kg / 13.58 lbs
6159 g / 60.4 N
 36.95 kg / 81.47 lbs
~0 Gs
5 mm 34.68 kg / 76.45 lbs
6 124 Gs
5.20 kg / 11.47 lbs
5202 g / 51.0 N
 31.21 kg / 68.81 lbs
~0 Gs
10 mm 21.45 kg / 47.30 lbs
4 817 Gs
3.22 kg / 7.09 lbs
3218 g / 31.6 N
 19.31 kg / 42.57 lbs
~0 Gs
20 mm 7.36 kg / 16.22 lbs
2 821 Gs
1.10 kg / 2.43 lbs
1104 g / 10.8 N
 6.62 kg / 14.60 lbs
~0 Gs
50 mm 0.40 kg / 0.89 lbs
662 Gs
0.06 kg / 0.13 lbs
61 g / 0.6 N
 0.36 kg / 0.80 lbs
~0 Gs
60 mm 0.18 kg / 0.41 lbs
447 Gs
0.03 kg / 0.06 lbs
28 g / 0.3 N
 0.17 kg / 0.37 lbs
~0 Gs
70 mm 0.09 kg / 0.20 lbs
314 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
 0.08 kg / 0.18 lbs
~0 Gs
80 mm 0.05 kg / 0.11 lbs
228 Gs
0.01 kg / 0.02 lbs
7 g / 0.1 N
 0.04 kg / 0.10 lbs
~0 Gs
90 mm 0.03 kg / 0.06 lbs
170 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
100 mm 0.02 kg / 0.03 lbs
130 Gs
0.00 kg / 0.01 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and sheet setup. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of action. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The levitation is a bit weaker than the connection force, but still impressive.
*Field value between like poles reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
* Estimates demonstrate sliding force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
MPL 30x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.0 cm
Timepiece 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Powerful magnet radiation poses a large risk to electronic devices and medical implants. These neodymiums generate a field that prevents correct functioning of digital equipment. Be aware: the unseen radiation acts through matter and housings. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, membranes, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MPL 30x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.82 km/h
(6.34 m/s)
 0.90 J
30 mm 36.47 km/h
(10.13 m/s)
 2.31 J
50 mm 46.99 km/h
(13.05 m/s)
 3.83 J
100 mm 66.44 km/h
(18.46 m/s)
 7.66 J
Magnetic elements are delicate – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Striking energy can cause material chips or painful pinches to skin. Hold the magnet firmly during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Coating parameters (durability)
MPL 30x20x10 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MPL 30x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 801 Mx 228.0 µWb
Pc Coefficient 0.46 Low (Flat)
Flux value passing through the magnet pole. Key data in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
MPL 30x20x10 / N38

Environment Effective steel pull Effect
Air (land) 19.53 kg Standard
Water (riverbed) 22.36 kg
(+2.83 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

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

2. Plate thickness effect

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

3. Heat tolerance

*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) = 0.46

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 specification and ecology
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: 020141-2026
Quick Unit Converter
Force (pull)
Field Strength
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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 30x20x10 mm and a weight of 45 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 19.53 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. Watch your fingers! Magnets with a force of 19.53 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 30x20x10 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners 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 30x20x10 / N38 model is magnetized through the thickness (dimension 10 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.
This model is characterized by dimensions 30x20x10 mm, which, at a weight of 45 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 19.53 kg (force ~191.55 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of rare earth magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • They possess excellent resistance to magnetism drop when exposed to external magnetic sources,
  • A magnet with a metallic nickel surface has an effective appearance,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to freedom in constructing and the capacity to modify to client solutions,
  • Wide application in electronics industry – they are utilized in hard drives, electric drive systems, medical devices, and other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Cons

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and 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 durability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of creating threads in the magnet and complex forms - recommended is cover - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these products can complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

The lifting capacity listed is a theoretical maximum value performed under standard conditions:
  • with the application of a sheet made of special test steel, ensuring full magnetic saturation
  • whose thickness equals approx. 10 mm
  • with an polished touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

Please note that the working load will differ subject to the following factors, starting with the most relevant:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
  • Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Temperature influence – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the holding force is lower. In addition, even a slight gap between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Compass and GPS

GPS units and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Power loss in heat

Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. This process is irreversible.

Life threat

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

Pinching danger

Pinching hazard: The pulling power is so great that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Shattering risk

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Fire warning

Dust generated during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Nickel coating and allergies

It is widely known that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, avoid direct skin contact and choose versions in plastic housing.

Conscious usage

Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Think ahead.

No play value

Strictly store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are fatal.

Electronic devices

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

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