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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

see technical specifications »

43.22 ZŁ with VAT / pcs + price for transport

35.14 ZŁ net + 23% VAT / pcs

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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 simulation of the assembly - data

The following values are the outcome of a physical simulation. Values rely on models for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these data as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs distance) - 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 pounds
24270.0 g / 238.1 N
 crushing
1 mm 4730 Gs
473.0 mT
 20.68 kg / 45.60 pounds
20685.0 g / 202.9 N
 crushing
2 mm 4335 Gs
433.5 mT
 17.37 kg / 38.30 pounds
17370.7 g / 170.4 N
 crushing
3 mm 3950 Gs
395.0 mT
 14.43 kg / 31.80 pounds
14425.2 g / 141.5 N
 crushing
5 mm 3240 Gs
324.0 mT
 9.71 kg / 21.40 pounds
9706.2 g / 95.2 N
 medium risk
10 mm 1923 Gs
192.3 mT
 3.42 kg / 7.53 pounds
3417.4 g / 33.5 N
 medium risk
15 mm 1163 Gs
116.3 mT
 1.25 kg / 2.76 pounds
1250.2 g / 12.3 N
 safe
20 mm 736 Gs
73.6 mT
 0.50 kg / 1.10 pounds
500.4 g / 4.9 N
 safe
30 mm 338 Gs
33.8 mT
 0.11 kg / 0.23 pounds
105.3 g / 1.0 N
 safe
50 mm 106 Gs
10.6 mT
 0.01 kg / 0.02 pounds
10.3 g / 0.1 N
 safe
Pulling power weakens drastically with every subsequent millimeter of distance. Remember that every additional insulation layer (e.g., dirt, varnish, veneer) noticeably weakens the grip. Magnetic products hold optimally at the point of direct contact; gap kills the power. Observe how rapidly the parameters drop, when the magnet does not touch flatly to the metal substrate. When planning the mounting, avoid redundant distances.

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 pounds
4854.0 g / 47.6 N
1 mm Stal (~0.2) 4.14 kg / 9.12 pounds
4136.0 g / 40.6 N
2 mm Stal (~0.2) 3.47 kg / 7.66 pounds
3474.0 g / 34.1 N
3 mm Stal (~0.2) 2.89 kg / 6.36 pounds
2886.0 g / 28.3 N
5 mm Stal (~0.2) 1.94 kg / 4.28 pounds
1942.0 g / 19.1 N
10 mm Stal (~0.2) 0.68 kg / 1.51 pounds
684.0 g / 6.7 N
15 mm Stal (~0.2) 0.25 kg / 0.55 pounds
250.0 g / 2.5 N
20 mm Stal (~0.2) 0.10 kg / 0.22 pounds
100.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
The table below defines the theoretical holding capacity sufficient to start the downward movement of the magnet down against a vertical steel wall (considering typical friction). This parameter depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 pounds
7281.0 g / 71.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.85 kg / 10.70 pounds
4854.0 g / 47.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.43 kg / 5.35 pounds
2427.0 g / 23.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.14 kg / 26.75 pounds
12135.0 g / 119.0 N
When mounting a element on a vertical wall (e.g., a fridge), it will only hold barely about 1/5 of its nominal power. Gravity and a weak degree of grip influence the fact that holders move down faster than they pop off the substrate. Planning a wall mount? Consider that the shear force is much weaker than the maximum static pull force. On a slippery surface, the magnet will give way down under a significantly smaller weight. Using a rubber layer can drastically raise the stability.

Table 4: Material efficiency (saturation) - 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 pounds
1213.5 g / 11.9 N
1 mm
13%
 3.03 kg / 6.69 pounds
3033.8 g / 29.8 N
2 mm
25%
 6.07 kg / 13.38 pounds
6067.5 g / 59.5 N
3 mm
38%
 9.10 kg / 20.06 pounds
9101.3 g / 89.3 N
5 mm
63%
 15.17 kg / 33.44 pounds
15168.8 g / 148.8 N
10 mm
100%
 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
11 mm
100%
 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
12 mm
100%
 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
A thin sheet is incapable of conduct the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a thin surface, the field will pass right through and the pull force will drop sharply. To squeeze 100% of this magnet's power, you need a suitably thick backing of metal. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the holder works worse. We advise picking the steel cross-section from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 30x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
 OK
40 °C -2.2% 23.74 kg / 52.33 pounds
23736.1 g / 232.9 N
 OK
60 °C -4.4% 23.20 kg / 51.15 pounds
23202.1 g / 227.6 N
 OK
80 °C -6.6% 22.67 kg / 49.97 pounds
22668.2 g / 222.4 N
100 °C -28.8% 17.28 kg / 38.10 pounds
17280.2 g / 169.5 N
Classic neodymiums lose parameters after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently destroy this product. As the temperature rises, the neodymium's power briefly decreases. Avoid using this magnet in hot environments exceeding its safe range. Too high temperature will lead to destruction of magnetic properties.
*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table signals permanent field degradation for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 97.11 kg / 214.09 pounds
5 859 Gs
14.57 kg / 32.11 pounds
14567 g / 142.9 N
 N/A
1 mm 89.88 kg / 198.15 pounds
9 859 Gs
13.48 kg / 29.72 pounds
13482 g / 132.3 N
 80.89 kg / 178.34 pounds
~0 Gs
2 mm 82.77 kg / 182.47 pounds
9 461 Gs
12.42 kg / 27.37 pounds
12415 g / 121.8 N
 74.49 kg / 164.22 pounds
~0 Gs
3 mm 75.96 kg / 167.47 pounds
9 063 Gs
11.39 kg / 25.12 pounds
11394 g / 111.8 N
 68.37 kg / 150.72 pounds
~0 Gs
5 mm 63.42 kg / 139.81 pounds
8 281 Gs
9.51 kg / 20.97 pounds
9513 g / 93.3 N
 57.08 kg / 125.83 pounds
~0 Gs
10 mm 38.84 kg / 85.62 pounds
6 481 Gs
5.83 kg / 12.84 pounds
5826 g / 57.1 N
 34.95 kg / 77.06 pounds
~0 Gs
20 mm 13.67 kg / 30.15 pounds
3 845 Gs
2.05 kg / 4.52 pounds
2051 g / 20.1 N
 12.31 kg / 27.13 pounds
~0 Gs
50 mm 0.88 kg / 1.94 pounds
976 Gs
0.13 kg / 0.29 pounds
132 g / 1.3 N
 0.79 kg / 1.75 pounds
~0 Gs
60 mm 0.42 kg / 0.93 pounds
675 Gs
0.06 kg / 0.14 pounds
63 g / 0.6 N
 0.38 kg / 0.84 pounds
~0 Gs
70 mm 0.22 kg / 0.48 pounds
484 Gs
0.03 kg / 0.07 pounds
33 g / 0.3 N
 0.20 kg / 0.43 pounds
~0 Gs
80 mm 0.12 kg / 0.26 pounds
358 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.24 pounds
~0 Gs
90 mm 0.07 kg / 0.15 pounds
272 Gs
0.01 kg / 0.02 pounds
10 g / 0.1 N
 0.06 kg / 0.14 pounds
~0 Gs
100 mm 0.04 kg / 0.09 pounds
211 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
Two magnets interact from a much further distance than a magnet and steel combination. The connection of two magnets creates a more powerful interaction and a further horizon of operation. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the pinch force is huge. The levitation is slightly lower than the connection force, but still impressive.
*Field value between like poles is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
* Results show sliding force of dual same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - 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
Timepiece 20 Gs (2.0 mT) 10.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.5 cm
Car key 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
Extremely neodym field poses a serious hazard to IT equipment and medical implants. These magnets generate a field that disrupts operation of sensitive medical devices. Be aware: the unseen radiation acts through matter and plastic. Special caution must be taken by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
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
Neodymium magnets are delicate – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can cause material chips or painful pinches to skin. Hold the magnet firmly during installation so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Surface protection spec
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

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)
Total magnetic flux passing through the pole surface. Key data when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

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

2. Steel thickness impact

*Thin metal sheet (e.g. computer 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) = 0.74

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.

Technical specification and ecology
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%
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: 020142-2026
Quick Unit Converter
Magnet pull force
Magnetic Induction
Insert a value in one of the inputs, and the remaining fields will recalculate on the fly.

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MPL 30x5x5 / N38 - lamellar magnet
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MPL 30x5x5 / N38 - lamellar magnet

4.15 ZŁ brutto / pcs
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. This rectangular block with a force of 238.07 N is ready for shipment in 24h, allowing for rapid realization of your project. 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 30x20x20 / 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. 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 fasteners under tiles, wood, or glass. 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. 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).
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.
This model is characterized by dimensions 30x20x20 mm, which, at a weight of 90 g, makes it an element with high energy density. It is a magnetic block with dimensions 30x20x20 mm and a self-weight of 90 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of neodymium magnets.

Benefits

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They do not lose strength, even over approximately 10 years – the drop in strength is only ~1% (according to tests),
  • They maintain their magnetic properties even under close interference source,
  • By using a lustrous layer of silver, the element gains an professional look,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • 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...
  • Possibility of accurate modeling and adapting to complex needs,
  • Universal use in high-tech industry – they are utilized in computer drives, electric drive systems, medical equipment, and other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating threads in the magnet and complicated shapes - recommended is cover - magnet mounting.
  • Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Additionally, small elements of these magnets are able to complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what affects it?

Holding force of 24.27 kg is a result of laboratory testing performed under standard conditions:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • with a cross-section minimum 10 mm
  • with a plane free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • under vertical force direction (90-degree angle)
  • in temp. approx. 20°C

Lifting capacity in practice – influencing factors

Please note that the application force will differ influenced by the following factors, starting with the most relevant:
  • Clearance – existence of foreign body (rust, tape, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
  • Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined with the use of a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the holding force.

Safe handling of neodymium magnets
Dust is flammable

Machining of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Product not for children

Always store magnets away from children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are fatal.

Pinching danger

Mind your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!

Powerful field

Use magnets consciously. Their powerful strength can surprise even experienced users. Be vigilant and respect their force.

Heat sensitivity

Do not overheat. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Precision electronics

An intense magnetic field negatively affects the operation of compasses in phones and GPS navigation. Maintain magnets close to a device to prevent damaging the sensors.

Metal Allergy

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, immediately stop working with magnets and wear gloves.

Data carriers

Device Safety: Strong magnets can damage data carriers and sensitive devices (pacemakers, medical aids, timepieces).

Material brittleness

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Clashing of two magnets leads to them cracking into small pieces.

Health Danger

People with a ICD should maintain an safe separation from magnets. The magnetic field can stop the operation of the implant.

Safety First! Learn more about hazards in the article: Safety of working with magnets.