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MPL 30x15x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020140

GTIN/EAN: 5906301811466

5.00

length

30 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

6.75 g

Magnetization Direction

↑ axial

Load capacity

2.11 kg / 20.69 N

Magnetic Induction

115.11 mT / 1151 Gs

Coating

[NiCuNi] Nickel

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3.89 ZŁ with VAT / pcs + price for transport

3.16 ZŁ net + 23% VAT / pcs

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Technical of the product - MPL 30x15x2 / N38 - lamellar magnet

Specification / characteristics - MPL 30x15x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020140
GTIN/EAN 5906301811466
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 15 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 6.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.11 kg / 20.69 N
Magnetic Induction ~ ? 115.11 mT / 1151 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x15x2 / 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 analysis of the magnet - report

The following values constitute the result of a mathematical analysis. Results rely on algorithms for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Use these calculations as a supplementary guide for designers.

Table 1: Static force (force vs distance) - interaction chart
MPL 30x15x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1151 Gs
115.1 mT
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
 medium risk
1 mm 1098 Gs
109.8 mT
 1.92 kg / 4.23 lbs
1920.5 g / 18.8 N
 low risk
2 mm 1019 Gs
101.9 mT
 1.65 kg / 3.65 lbs
1654.9 g / 16.2 N
 low risk
3 mm 926 Gs
92.6 mT
 1.37 kg / 3.01 lbs
1365.9 g / 13.4 N
 low risk
5 mm 733 Gs
73.3 mT
 0.86 kg / 1.89 lbs
855.2 g / 8.4 N
 low risk
10 mm 379 Gs
37.9 mT
 0.23 kg / 0.50 lbs
228.8 g / 2.2 N
 low risk
15 mm 203 Gs
20.3 mT
 0.07 kg / 0.14 lbs
65.6 g / 0.6 N
 low risk
20 mm 116 Gs
11.6 mT
 0.02 kg / 0.05 lbs
21.6 g / 0.2 N
 low risk
30 mm 46 Gs
4.6 mT
 0.00 kg / 0.01 lbs
3.4 g / 0.0 N
 low risk
50 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 low risk
Pulling power decreases sharply with every subsequent millimeter of spacing. Remember that even a microscopic distance (e.g., contamination, paint, rust) significantly diminishes the holding power. Magnets operate strongest in perfect adhesion; air break weakens the force. Analyze how rapidly the pull force drop, when the magnet does not touch tightly to the metal substrate. When planning the assembly, eliminate unnecessary gaps.

Table 2: Vertical hold (wall)
MPL 30x15x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.42 kg / 0.93 lbs
422.0 g / 4.1 N
1 mm Stal (~0.2) 0.38 kg / 0.85 lbs
384.0 g / 3.8 N
2 mm Stal (~0.2) 0.33 kg / 0.73 lbs
330.0 g / 3.2 N
3 mm Stal (~0.2) 0.27 kg / 0.60 lbs
274.0 g / 2.7 N
5 mm Stal (~0.2) 0.17 kg / 0.38 lbs
172.0 g / 1.7 N
10 mm Stal (~0.2) 0.05 kg / 0.10 lbs
46.0 g / 0.5 N
15 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 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
The table below calculates the theoretical shear load necessary to start the sliding of the magnet downwards along a upright steel plate (considering standard friction). This parameter is relative to the distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MPL 30x15x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.63 kg / 1.40 lbs
633.0 g / 6.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.42 kg / 0.93 lbs
422.0 g / 4.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.21 kg / 0.47 lbs
211.0 g / 2.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.06 kg / 2.33 lbs
1055.0 g / 10.3 N
When mounting a magnet on a upright surface (e.g., a car body), it will maintain barely approx. 20%-30% of its nominal power. Gravity as well as a low friction coefficient cause that products slip easier than they pop off the substrate. Planning a hanger? Consider that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a much lighter cargo. Utilizing a rubberized coating can effectively increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 30x15x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.21 kg / 0.47 lbs
211.0 g / 2.1 N
1 mm
25%
 0.53 kg / 1.16 lbs
527.5 g / 5.2 N
2 mm
50%
 1.06 kg / 2.33 lbs
1055.0 g / 10.3 N
3 mm
75%
 1.58 kg / 3.49 lbs
1582.5 g / 15.5 N
5 mm
100%
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
10 mm
100%
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
11 mm
100%
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
12 mm
100%
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
A thin metal plate is not enough to conduct the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you require a sufficiently solid backing of metal. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the holder holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
MPL 30x15x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
 OK
40 °C -2.2% 2.06 kg / 4.55 lbs
2063.6 g / 20.2 N
 OK
60 °C -4.4% 2.02 kg / 4.45 lbs
2017.2 g / 19.8 N
80 °C -6.6% 1.97 kg / 4.34 lbs
1970.7 g / 19.3 N
100 °C -28.8% 1.50 kg / 3.31 lbs
1502.3 g / 14.7 N
Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Protect against heat – high temperature can permanently demagnetize this magnet. With every degree above norm, the neodymium's force temporarily drops. Avoid using this product close to heaters higher than its safe range. Too high temperature will lead to permanent loss of magnetic properties.
*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MPL 30x15x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.67 kg / 8.10 lbs
2 169 Gs
0.55 kg / 1.22 lbs
551 g / 5.4 N
 N/A
1 mm 3.53 kg / 7.79 lbs
2 257 Gs
0.53 kg / 1.17 lbs
530 g / 5.2 N
 3.18 kg / 7.01 lbs
~0 Gs
2 mm 3.34 kg / 7.37 lbs
2 196 Gs
0.50 kg / 1.11 lbs
502 g / 4.9 N
 3.01 kg / 6.64 lbs
~0 Gs
3 mm 3.12 kg / 6.89 lbs
2 122 Gs
0.47 kg / 1.03 lbs
469 g / 4.6 N
 2.81 kg / 6.20 lbs
~0 Gs
5 mm 2.63 kg / 5.80 lbs
1 948 Gs
0.39 kg / 0.87 lbs
395 g / 3.9 N
 2.37 kg / 5.22 lbs
~0 Gs
10 mm 1.49 kg / 3.28 lbs
1 465 Gs
0.22 kg / 0.49 lbs
223 g / 2.2 N
 1.34 kg / 2.96 lbs
~0 Gs
20 mm 0.40 kg / 0.88 lbs
758 Gs
0.06 kg / 0.13 lbs
60 g / 0.6 N
 0.36 kg / 0.79 lbs
~0 Gs
50 mm 0.01 kg / 0.03 lbs
142 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
60 mm 0.01 kg / 0.01 lbs
92 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
63 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
44 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
32 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
24 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 steel setup. The setup of two magnets creates a more powerful interaction and a larger range of operation. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when bringing together two magnets, the pinch force is huge. The repulsion force is slightly lower than the connection force, but still significant.
*The magnetic induction between like poles reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Estimates refer to friction force of dual same magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - warnings
MPL 30x15x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation is a serious hazard to electronic devices as well as pacemakers. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation passes through tissues and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MPL 30x15x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.00 km/h
(5.28 m/s)
 0.09 J
30 mm 30.91 km/h
(8.59 m/s)
 0.25 J
50 mm 39.87 km/h
(11.08 m/s)
 0.41 J
100 mm 56.39 km/h
(15.66 m/s)
 0.83 J
Magnetic elements are prone to chipping – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or injury to fingers. Always hold the magnet during installation so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Surface protection spec
MPL 30x15x2 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MPL 30x15x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 236 Mx 62.4 µWb
Pc Coefficient 0.13 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data for generator designers and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 30x15x2 / N38

Environment Effective steel pull Effect
Air (land) 2.11 kg Standard
Water (riverbed) 2.42 kg
(+0.31 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

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

2. Steel saturation

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

3. Power loss vs temp

*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) = 0.13

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.

Engineering data and GPSR
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: 020140-2026
Quick Unit Converter
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 30x15x2 mm and a weight of 6.75 g, guarantees premium class connection. This magnetic block with a force of 20.69 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects 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. Watch your fingers! Magnets with a force of 2.11 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. They work great as invisible mounts 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. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 30x15x2 / N38 model is magnetized through the thickness (dimension 2 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 30x15x2 mm, which, at a weight of 6.75 g, makes it an element with high energy density. It is a magnetic block with dimensions 30x15x2 mm and a self-weight of 6.75 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 rare earth magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • Neodymium magnets are distinguished by extremely resistant to magnetic field loss caused by magnetic disturbances,
  • A magnet with a shiny nickel surface looks better,
  • Magnetic induction on the working part of the magnet remains extremely intense,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Thanks to flexibility in shaping and the capacity to adapt to specific needs,
  • Versatile presence in modern technologies – they are commonly used in computer drives, brushless drives, medical devices, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in small systems

Weaknesses

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. 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 and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these magnets are able to complicate diagnosis medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

Breakaway force was determined for optimal configuration, including:
  • using a plate made of mild steel, serving as a circuit closing element
  • whose thickness is min. 10 mm
  • with a surface free of scratches
  • under conditions of no distance (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

Determinants of practical lifting force of a magnet

Bear in mind that the magnet holding will differ depending on the following factors, in order of importance:
  • Clearance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Plate material – mild steel attracts best. Higher carbon content decrease magnetic properties and holding force.
  • Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering 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, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Safe handling of NdFeB magnets
Hand protection

Big blocks can smash fingers instantly. Do not place your hand between two attracting surfaces.

Threat to navigation

Remember: rare earth magnets produce a field that confuses sensitive sensors. Keep a safe distance from your mobile, device, and navigation systems.

Risk of cracking

Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Sensitization to coating

Studies show that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, avoid direct skin contact and opt for encased magnets.

Pacemakers

People with a heart stimulator have to keep an large gap from magnets. The magnetism can stop the operation of the life-saving device.

Heat sensitivity

Do not overheat. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

This is not a toy

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

Dust is flammable

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

Data carriers

Intense magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.

Handling guide

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

Attention! Need more info? Check our post: Are neodymium magnets dangerous?