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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

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9.10 ZŁ with VAT / pcs + price for transport

7.40 ZŁ net + 23% VAT / pcs

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Strength along with appearance of a neodymium magnet can be analyzed with our modular calculator.

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Detailed specification - 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

Technical simulation of the magnet - report

The following data constitute the direct effect of a mathematical simulation. Values are based on algorithms for the material Nd2Fe14B. Actual conditions may differ. Use these data as a reference point during assembly planning.

Table 1: Static force (force vs distance) - characteristics
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
 strong
1 mm 2092 Gs
209.2 mT
 8.01 kg / 17.67 lbs
8013.9 g / 78.6 N
 strong
2 mm 1961 Gs
196.1 mT
 7.04 kg / 15.53 lbs
7042.1 g / 69.1 N
 strong
3 mm 1817 Gs
181.7 mT
 6.04 kg / 13.32 lbs
6041.8 g / 59.3 N
 strong
5 mm 1516 Gs
151.6 mT
 4.21 kg / 9.28 lbs
4209.6 g / 41.3 N
 strong
10 mm 892 Gs
89.2 mT
 1.46 kg / 3.21 lbs
1456.2 g / 14.3 N
 weak grip
15 mm 519 Gs
51.9 mT
 0.49 kg / 1.09 lbs
492.4 g / 4.8 N
 weak grip
20 mm 313 Gs
31.3 mT
 0.18 kg / 0.40 lbs
179.8 g / 1.8 N
 weak grip
30 mm 132 Gs
13.2 mT
 0.03 kg / 0.07 lbs
31.9 g / 0.3 N
 weak grip
50 mm 37 Gs
3.7 mT
 0.00 kg / 0.01 lbs
2.5 g / 0.0 N
 weak grip
Grip strength weakens sharply with every mm of spacing. Remember that even a microscopic distance (e.g., dirt, paint, veneer) strongly diminishes the holding power. Neodymiums work strongest in perfect adhesion; gap kills the force. Observe how rapidly the load capacity plummet, when the product does not adhere tightly to the metal substrate. When calculating the arrangement, discard additional spacers.

Table 2: Shear force (wall)
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
The table below calculates the theoretical force sufficient to cause the sliding of the magnet vertically along a vertical steel wall (assuming typical friction coefficient). The holding force is a function of the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 surface (e.g., a board), it will only hold only approx. 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient mean that magnets move down faster than they detach. Designing a hanger? Remember that the shear force is much weaker than the maximum static pull force. On a smooth steel, the holder will slip down under a significantly smaller weight. Using a rubber coating can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
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 unable to conduct the entire magnetic field, which squanders power of the magnet. Should you attach a powerful product to a weak sheet, the field will penetrate right through and the attraction force will be weaker. To utilize 100% of this magnet's power, you need a suitably thick element of steel. The saturation effect means that on sheet metal structures (e.g., appliance housings), the magnet shows lower pull force. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - resistance threshold
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
Classic neodymiums irreversibly lose power past the thermal threshold. Protect against heat – high temperature can irreversibly demagnetize this product. With every degree above norm, the magnet's power temporarily drops. Do not use this magnet close to heaters higher than its operating temperature limit. Ignoring the limit will lead to permanent loss of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures than long magnets. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 30x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 magnetic products interact from a wider radius than a magnet and steel combination. The connection of magnet-to-magnet produces a massive flux and a wider radius of operation. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is huge. The repulsion force is marginally weaker than the attraction, but still large.
*The magnetic induction between like poles is approximately ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Important: Figures demonstrate sliding force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - precautionary measures
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
Car key 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
Powerful magnet radiation is a real danger to IT equipment as well as pacemakers. These magnets produce a field that disrupts operation of digital equipment. Notice: the invisible magnetic field penetrates the body and plastic. Special caution must be exercised by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

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
Neodymium magnets are very brittle – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Striking energy can cause material chips or painful pinches to fingers. Be sure to control the product during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

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)
Flux value passing through the pole surface. Key data for generator designers and motors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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

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

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 and environmental data
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: 020143-2026
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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x20x5 mm and a weight of 22.5 g, guarantees premium class connection. As a magnetic bar with high power (approx. 8.86 kg), this product is available immediately 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 8.86 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.
They constitute a key element in the production of wind 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 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. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
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 product meets the standards for N38 grade magnets.

Pros and cons of Nd2Fe14B magnets.

Strengths

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They do not lose strength, even after nearly ten years – the reduction in power is only ~1% (according to tests),
  • Neodymium magnets prove to be remarkably resistant to demagnetization caused by external magnetic fields,
  • A magnet with a smooth gold surface has better aesthetics,
  • Neodymium magnets achieve maximum magnetic induction on a their surface, which increases force concentration,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Due to the potential of precise molding and adaptation to custom needs, NdFeB magnets can be modeled in a broad palette of forms and dimensions, which amplifies use scope,
  • Huge importance in innovative solutions – they find application in data components, motor assemblies, advanced medical instruments, also modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power 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
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited ability of making nuts in the magnet and complex shapes - preferred is a housing - magnet mounting.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Holding force characteristics

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

The force parameter is a measurement result executed under standard conditions:
  • on a plate made of mild steel, optimally conducting the magnetic flux
  • whose thickness equals approx. 10 mm
  • with an ideally smooth touching surface
  • under conditions of ideal adhesion (metal-to-metal)
  • under axial force direction (90-degree angle)
  • at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the magnet holding may be lower subject to elements below, in order of importance:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Base massiveness – insufficiently thick plate does not close the flux, causing part of the flux to be escaped into the air.
  • Material type – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Magnetic media

Data protection: Strong magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Fire warning

Machining of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Adults only

Adult use only. Tiny parts pose a choking risk, causing severe trauma. Store away from kids and pets.

Metal Allergy

A percentage of the population have a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Prolonged contact might lead to a rash. It is best to use protective gloves.

Danger to pacemakers

People with a heart stimulator should keep an absolute distance from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Crushing force

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

Threat to navigation

GPS units and mobile phones are highly sensitive to magnetic fields. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Do not underestimate power

Use magnets with awareness. Their immense force can surprise even professionals. Plan your moves and do not underestimate their force.

Material brittleness

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Thermal limits

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Safety First! Looking for details? Check our post: Are neodymium magnets dangerous?