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MPL 30x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020138

GTIN/EAN: 5906301811442

5.00

length

30 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.25 g

Magnetization Direction

↑ axial

Load capacity

8.89 kg / 87.23 N

Magnetic Induction

329.52 mT / 3295 Gs

Coating

[NiCuNi] Nickel

check specifications »

4.26 ZŁ with VAT / pcs + price for transport

3.46 ZŁ net + 23% VAT / pcs

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Physical properties - MPL 30x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020138
GTIN/EAN 5906301811442
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 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.89 kg / 87.23 N
Magnetic Induction ~ ? 329.52 mT / 3295 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x10x5 / 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 analysis of the assembly - report

These data constitute the outcome of a mathematical simulation. Results rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ. Please consider these calculations as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - power drop
MPL 30x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3294 Gs
329.4 mT
 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
 warning
1 mm 2866 Gs
286.6 mT
 6.73 kg / 14.84 pounds
6731.1 g / 66.0 N
 warning
2 mm 2424 Gs
242.4 mT
 4.82 kg / 10.62 pounds
4816.4 g / 47.2 N
 warning
3 mm 2022 Gs
202.2 mT
 3.35 kg / 7.38 pounds
3349.6 g / 32.9 N
 warning
5 mm 1397 Gs
139.7 mT
 1.60 kg / 3.53 pounds
1600.3 g / 15.7 N
 safe
10 mm 615 Gs
61.5 mT
 0.31 kg / 0.68 pounds
309.8 g / 3.0 N
 safe
15 mm 314 Gs
31.4 mT
 0.08 kg / 0.18 pounds
80.6 g / 0.8 N
 safe
20 mm 177 Gs
17.7 mT
 0.03 kg / 0.06 pounds
25.8 g / 0.3 N
 safe
30 mm 70 Gs
7.0 mT
 0.00 kg / 0.01 pounds
4.1 g / 0.0 N
 safe
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 safe
Grip strength drops sharply with every subsequent millimeter of distance. Keep in mind that every additional insulation layer (e.g., dirt, varnish, dust) significantly diminishes the holding power. Magnetic products hold optimally during direct contact; air break drastically cuts the power. See how quickly the pull force fall, when the product does not touch flatly to the metal substrate. When planning the mounting, eliminate redundant distances.

Table 2: Vertical capacity (vertical surface)
MPL 30x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.78 kg / 3.92 pounds
1778.0 g / 17.4 N
1 mm Stal (~0.2) 1.35 kg / 2.97 pounds
1346.0 g / 13.2 N
2 mm Stal (~0.2) 0.96 kg / 2.13 pounds
964.0 g / 9.5 N
3 mm Stal (~0.2) 0.67 kg / 1.48 pounds
670.0 g / 6.6 N
5 mm Stal (~0.2) 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
10 mm Stal (~0.2) 0.06 kg / 0.14 pounds
62.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 pounds
16.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data presents the theoretical weight limit necessary to start the sliding of the magnet vertically on a upright metal surface (considering standard friction coefficient). This parameter varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 30x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.67 kg / 5.88 pounds
2667.0 g / 26.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.78 kg / 3.92 pounds
1778.0 g / 17.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.89 kg / 1.96 pounds
889.0 g / 8.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.45 kg / 9.80 pounds
4445.0 g / 43.6 N
When placing a element on a vertical wall (e.g., a fridge), it you can count on only about 1/5 of its nominal power. Gravitational force and a low friction coefficient cause that products slide down easier than they pull off. Designing a hanger? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a noticeably lighter load. Using a rubber coating can effectively increase the grip.

Table 4: Steel thickness (saturation) - power losses
MPL 30x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.89 kg / 1.96 pounds
889.0 g / 8.7 N
1 mm
25%
 2.22 kg / 4.90 pounds
2222.5 g / 21.8 N
2 mm
50%
 4.45 kg / 9.80 pounds
4445.0 g / 43.6 N
3 mm
75%
 6.67 kg / 14.70 pounds
6667.5 g / 65.4 N
5 mm
100%
 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
10 mm
100%
 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
11 mm
100%
 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
12 mm
100%
 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
A thin metal plate is not enough to absorb the entire magnetic field, which weakens actual performance of the holder. Should you mount a strong magnet to a thin surface, the flux will pass right through and the attraction force will be weaker. To squeeze 100% of this magnet's power, you need a suitably thick piece of steel. The saturation effect means that on sheet metal structures (e.g., car bodies), the magnet holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (stability) - resistance threshold
MPL 30x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
 OK
40 °C -2.2% 8.69 kg / 19.17 pounds
8694.4 g / 85.3 N
 OK
60 °C -4.4% 8.50 kg / 18.74 pounds
8498.8 g / 83.4 N
80 °C -6.6% 8.30 kg / 18.31 pounds
8303.3 g / 81.5 N
100 °C -28.8% 6.33 kg / 13.95 pounds
6329.7 g / 62.1 N
Ordinary NdFeB products lose parameters above the temperature limit. Watch out for overheating – high temperature can permanently destroy this product. With increasing heat, the neodymium's power briefly lowers. Avoid using this product in hot environments exceeding its operating temperature limit. Too high temperature will lead to irreversible degradation of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 30x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 20.06 kg / 44.23 pounds
4 689 Gs
3.01 kg / 6.63 pounds
3010 g / 29.5 N
 N/A
1 mm 17.63 kg / 38.86 pounds
6 174 Gs
2.64 kg / 5.83 pounds
2644 g / 25.9 N
 15.86 kg / 34.98 pounds
~0 Gs
2 mm 15.19 kg / 33.49 pounds
5 732 Gs
2.28 kg / 5.02 pounds
2279 g / 22.4 N
 13.67 kg / 30.14 pounds
~0 Gs
3 mm 12.92 kg / 28.47 pounds
5 285 Gs
1.94 kg / 4.27 pounds
1937 g / 19.0 N
 11.62 kg / 25.63 pounds
~0 Gs
5 mm 9.08 kg / 20.03 pounds
4 432 Gs
1.36 kg / 3.00 pounds
1363 g / 13.4 N
 8.18 kg / 18.02 pounds
~0 Gs
10 mm 3.61 kg / 7.96 pounds
2 795 Gs
0.54 kg / 1.19 pounds
542 g / 5.3 N
 3.25 kg / 7.17 pounds
~0 Gs
20 mm 0.70 kg / 1.54 pounds
1 230 Gs
0.10 kg / 0.23 pounds
105 g / 1.0 N
 0.63 kg / 1.39 pounds
~0 Gs
50 mm 0.02 kg / 0.05 pounds
217 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
60 mm 0.01 kg / 0.02 pounds
141 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.01 pounds
96 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
68 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
50 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
38 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a wider radius than a neodymium and metal combination. Such a system of magnet-to-magnet produces a massive flux and a further horizon of operation. Want to build a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is massive. The repulsion force is slightly lower than the attraction, but still impressive.
*Flux density between like poles drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Attention: Estimates show friction force of two matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 30x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation is a real danger to electronics as well as pacemakers. These magnets produce a flux that disrupts operation of digital equipment. Be aware: the unseen radiation penetrates the body and plastic. Special caution must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MPL 30x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.96 km/h
(8.04 m/s)
 0.36 J
30 mm 49.12 km/h
(13.64 m/s)
 1.05 J
50 mm 63.39 km/h
(17.61 m/s)
 1.74 J
100 mm 89.65 km/h
(24.90 m/s)
 3.49 J
Magnetic elements are very brittle – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Impact energy can cause material chips or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 30x10x5 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MPL 30x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 370 Mx 93.7 µWb
Pc Coefficient 0.35 Low (Flat)
Flux value passing through the magnet pole. Key data for generator designers and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 30x10x5 / N38

Environment Effective steel pull Effect
Air (land) 8.89 kg Standard
Water (riverbed) 10.18 kg
(+1.29 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

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

2. Plate thickness effect

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

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.35

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%
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: 020138-2026
Magnet Unit Converter
Pulling force
Magnetic Induction
Simply complete a single box, to let the tool fill in the rest automatically.

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Component MPL 30x10x5 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 87.23 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding 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 30x10x5 / 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.
Plate magnets MPL 30x10x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as invisible mounts under tiles, wood, or glass. 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 30x10x5 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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 30x10x5 / N38 model is magnetized through the thickness (dimension 5 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 (30x10 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 30x10x5 mm, which, at a weight of 11.25 g, makes it an element with impressive energy density. The key parameter here is the holding force amounting to approximately 8.89 kg (force ~87.23 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd2Fe14B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their power remains stable, and after around ten years it drops only by ~1% (theoretically),
  • They maintain their magnetic properties even under strong external field,
  • In other words, due to the shiny layer of nickel, the element gains visual value,
  • They are known for high magnetic induction at the operating surface, which affects their effectiveness,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in designing and the ability to modify to complex applications,
  • Universal use in modern industrial fields – they are commonly used in magnetic memories, electromotive mechanisms, precision medical tools, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of making nuts in the magnet and complicated shapes - recommended is cover - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these products can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Highest magnetic holding force – what it depends on?

The load parameter shown refers to the limit force, recorded under ideal test conditions, namely:
  • using a plate made of high-permeability steel, acting as a circuit closing element
  • with a cross-section of at least 10 mm
  • with an ground contact surface
  • under conditions of no distance (metal-to-metal)
  • during pulling in a direction perpendicular to the mounting surface
  • at conditions approx. 20°C

Key elements affecting lifting force

In real-world applications, the real power depends on several key aspects, ranked from the most important:
  • Clearance – existence of any layer (rust, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – insufficiently thick plate does not close the flux, causing part of the power to be lost to the other side.
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures lower magnetic properties and lifting capacity.
  • Surface structure – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Temperature – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate lowers the holding force.

Safe handling of NdFeB magnets
Risk of cracking

Beware of splinters. Magnets can fracture upon violent connection, ejecting shards into the air. We recommend safety glasses.

Heat sensitivity

Standard neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Immense force

Use magnets with awareness. Their powerful strength can shock even professionals. Plan your moves and respect their power.

Electronic devices

Intense magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

GPS Danger

A strong magnetic field disrupts the functioning of magnetometers in smartphones and navigation systems. Maintain magnets near a smartphone to avoid breaking the sensors.

Life threat

For implant holders: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or request help to work with the magnets.

Fire risk

Fire hazard: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Bone fractures

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

This is not a toy

Always keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are fatal.

Warning for allergy sufferers

Some people have a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Extended handling may cause dermatitis. It is best to use safety gloves.

Security! Want to know more? Check our post: Are neodymium magnets dangerous?