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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 technical specifications »

4.26 ZŁ with VAT / pcs + price for transport

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Technical details - 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

Technical modeling of the assembly - data

Presented information represent the direct effect of a mathematical simulation. Values were calculated on models for the class Nd2Fe14B. Operational parameters might slightly differ. Treat these calculations as a preliminary roadmap for designers.

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 lbs
8890.0 g / 87.2 N
 medium risk
1 mm 2866 Gs
286.6 mT
 6.73 kg / 14.84 lbs
6731.1 g / 66.0 N
 medium risk
2 mm 2424 Gs
242.4 mT
 4.82 kg / 10.62 lbs
4816.4 g / 47.2 N
 medium risk
3 mm 2022 Gs
202.2 mT
 3.35 kg / 7.38 lbs
3349.6 g / 32.9 N
 medium risk
5 mm 1397 Gs
139.7 mT
 1.60 kg / 3.53 lbs
1600.3 g / 15.7 N
 low risk
10 mm 615 Gs
61.5 mT
 0.31 kg / 0.68 lbs
309.8 g / 3.0 N
 low risk
15 mm 314 Gs
31.4 mT
 0.08 kg / 0.18 lbs
80.6 g / 0.8 N
 low risk
20 mm 177 Gs
17.7 mT
 0.03 kg / 0.06 lbs
25.8 g / 0.3 N
 low risk
30 mm 70 Gs
7.0 mT
 0.00 kg / 0.01 lbs
4.1 g / 0.0 N
 low risk
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 lbs
0.3 g / 0.0 N
 low risk
Magnetic force decreases sharply with every subsequent millimeter of distance. Note that even a very thin break (e.g., contamination, paint, rust) significantly reduces the pull force. Neodymiums work strongest in perfect adhesion; gap weakens the power. See how rapidly the load capacity drop, when the product does not touch directly to the steel surface. When designing the mounting, eliminate additional spacers.

Table 2: Shear load (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 lbs
1778.0 g / 17.4 N
1 mm Stal (~0.2) 1.35 kg / 2.97 lbs
1346.0 g / 13.2 N
2 mm Stal (~0.2) 0.96 kg / 2.13 lbs
964.0 g / 9.5 N
3 mm Stal (~0.2) 0.67 kg / 1.48 lbs
670.0 g / 6.6 N
5 mm Stal (~0.2) 0.32 kg / 0.71 lbs
320.0 g / 3.1 N
10 mm Stal (~0.2) 0.06 kg / 0.14 lbs
62.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 lbs
16.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
This section presents the theoretical shear load required to start the slippage of the magnet vertically along a upright steel plate (considering standard friction coefficient). This value is a function of the air gap between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
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 lbs
2667.0 g / 26.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.78 kg / 3.92 lbs
1778.0 g / 17.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.89 kg / 1.96 lbs
889.0 g / 8.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.45 kg / 9.80 lbs
4445.0 g / 43.6 N
When placing a holder on a upright plane (e.g., a fridge), it will only hold only about 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient influence the fact that magnets slip easier than they pop off the substrate. Planning a hanger? Note that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a significantly smaller weight. Application of an anti-slip coating can significantly increase the grip.

Table 4: Steel thickness (substrate influence) - 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 lbs
889.0 g / 8.7 N
1 mm
25%
 2.22 kg / 4.90 lbs
2222.5 g / 21.8 N
2 mm
50%
 4.45 kg / 9.80 lbs
4445.0 g / 43.6 N
3 mm
75%
 6.67 kg / 14.70 lbs
6667.5 g / 65.4 N
5 mm
100%
 8.89 kg / 19.60 lbs
8890.0 g / 87.2 N
10 mm
100%
 8.89 kg / 19.60 lbs
8890.0 g / 87.2 N
11 mm
100%
 8.89 kg / 19.60 lbs
8890.0 g / 87.2 N
12 mm
100%
 8.89 kg / 19.60 lbs
8890.0 g / 87.2 N
A thin sheet cannot conduct the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a weak sheet, the flux will pass right through and the pull force will drop sharply. To utilize full efficiency of this magnet's power, you need a suitably thick element of steel. The material oversaturation means that on sheet metal structures (e.g., car bodies), the holder works worse. We advise picking the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - power drop
MPL 30x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.89 kg / 19.60 lbs
8890.0 g / 87.2 N
 OK
40 °C -2.2% 8.69 kg / 19.17 lbs
8694.4 g / 85.3 N
 OK
60 °C -4.4% 8.50 kg / 18.74 lbs
8498.8 g / 83.4 N
80 °C -6.6% 8.30 kg / 18.31 lbs
8303.3 g / 81.5 N
100 °C -28.8% 6.33 kg / 13.95 lbs
6329.7 g / 62.1 N
Ordinary NdFeB products change their properties strength above the temperature limit. Protect against heat – high temperature can permanently destroy this product. With every degree above norm, the neodymium's force temporarily lowers. Refrain from using this magnet in hot environments higher than its operating temperature limit. Too high temperature will result in irreversible degradation of magnetism.
*Important note: Heat tolerance is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) risk losing magnetic properties sooner than taller cylinders. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field collision
MPL 30x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 20.06 kg / 44.23 lbs
4 689 Gs
3.01 kg / 6.63 lbs
3010 g / 29.5 N
 N/A
1 mm 17.63 kg / 38.86 lbs
6 174 Gs
2.64 kg / 5.83 lbs
2644 g / 25.9 N
 15.86 kg / 34.98 lbs
~0 Gs
2 mm 15.19 kg / 33.49 lbs
5 732 Gs
2.28 kg / 5.02 lbs
2279 g / 22.4 N
 13.67 kg / 30.14 lbs
~0 Gs
3 mm 12.92 kg / 28.47 lbs
5 285 Gs
1.94 kg / 4.27 lbs
1937 g / 19.0 N
 11.62 kg / 25.63 lbs
~0 Gs
5 mm 9.08 kg / 20.03 lbs
4 432 Gs
1.36 kg / 3.00 lbs
1363 g / 13.4 N
 8.18 kg / 18.02 lbs
~0 Gs
10 mm 3.61 kg / 7.96 lbs
2 795 Gs
0.54 kg / 1.19 lbs
542 g / 5.3 N
 3.25 kg / 7.17 lbs
~0 Gs
20 mm 0.70 kg / 1.54 lbs
1 230 Gs
0.10 kg / 0.23 lbs
105 g / 1.0 N
 0.63 kg / 1.39 lbs
~0 Gs
50 mm 0.02 kg / 0.05 lbs
217 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
60 mm 0.01 kg / 0.02 lbs
141 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.01 lbs
96 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
68 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
50 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
38 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Planning to create a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The levitation is marginally weaker than the connection force, but still large.
*The magnetic induction between like poles drops to ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Attention: Estimates refer to sliding force of dual identical magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - warnings
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
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 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
A strong magnetic field is a real danger to electronics and pacemakers. These neodymiums produce a field that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and housings. Special caution must be taken by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - 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
NdFeB products are prone to chipping – a violent impact against metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can trigger coating fragments or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Surface protection spec
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: Construction 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 pole surface. Key data in coil applications and motors. Pc value defines the magnet's operating point.

Table 11: Physics of underwater searching
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%
Warning: 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. Buoyancy helps in lifting finds.
1. Shear force

*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

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

3. Heat tolerance

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

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

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

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
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%
Environmental data
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
Measurement Calculator
Pulling force
Field Strength
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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x10x5 mm and a weight of 11.25 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 8.89 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.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 30x10x5 / 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. 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. 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).
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. It is a magnetic block with dimensions 30x10x5 mm and a self-weight of 11.25 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of Nd2Fe14B magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their strength is maintained, and after around 10 years it drops only by ~1% (according to research),
  • They feature excellent resistance to magnetic field loss due to opposing magnetic fields,
  • Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold-plated, or silver-plated gives an elegant appearance,
  • Magnets exhibit extremely high magnetic induction on the surface,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • Possibility of accurate machining and modifying to specific requirements,
  • Universal use in electronics industry – they are used in data components, electromotive mechanisms, advanced medical instruments, as well as industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of producing threads in the magnet and complicated shapes - recommended is a housing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small components of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Highest magnetic holding force – what it depends on?

The lifting capacity listed is a measurement result performed under standard conditions:
  • with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
  • with a cross-section no less than 10 mm
  • characterized by lack of roughness
  • without any clearance between the magnet and steel
  • under vertical force vector (90-degree angle)
  • in neutral thermal conditions

Determinants of lifting force in real conditions

Real force impacted by working environment parameters, mainly (from priority):
  • Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Angle of force application – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Metal type – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets
Magnetic interference

Be aware: rare earth magnets produce a field that confuses sensitive sensors. Keep a separation from your mobile, device, and navigation systems.

Nickel coating and allergies

It is widely known that nickel (the usual finish) is a common allergen. If you have an allergy, avoid touching magnets with bare hands or choose coated magnets.

Fire risk

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Swallowing risk

Always keep magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are fatal.

Warning for heart patients

People with a ICD must keep an absolute distance from magnets. The magnetism can stop the operation of the life-saving device.

Protective goggles

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Crushing force

Risk of injury: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Do not overheat magnets

Control the heat. Exposing the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Keep away from computers

Device Safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Caution required

Exercise caution. Neodymium magnets act from a distance and connect with massive power, often quicker than you can move away.

Security! Details about hazards in the article: Safety of working with magnets.