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MPL 30x15x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020389

GTIN/EAN: 5906301811886

5.00

length

30 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

33.75 g

Magnetization Direction

↑ axial

Load capacity

16.84 kg / 165.22 N

Magnetic Induction

413.45 mT / 4135 Gs

Coating

[NiCuNi] Nickel

see properties »

24.48 ZŁ with VAT / pcs + price for transport

19.90 ZŁ net + 23% VAT / pcs

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Physical properties - MPL 30x15x10 / N38 - lamellar magnet

Specification / characteristics - MPL 30x15x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020389
GTIN/EAN 5906301811886
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 10 mm [±0,1 mm]
Weight 33.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 16.84 kg / 165.22 N
Magnetic Induction ~ ? 413.45 mT / 4135 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x15x10 / 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 magnet - technical parameters

Presented values constitute the direct effect of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Treat these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
MPL 30x15x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4133 Gs
413.3 mT
 16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
 dangerous!
1 mm 3754 Gs
375.4 mT
 13.89 kg / 30.62 lbs
13889.5 g / 136.3 N
 dangerous!
2 mm 3365 Gs
336.5 mT
 11.16 kg / 24.60 lbs
11159.2 g / 109.5 N
 dangerous!
3 mm 2988 Gs
298.8 mT
 8.80 kg / 19.41 lbs
8803.6 g / 86.4 N
 warning
5 mm 2321 Gs
232.1 mT
 5.31 kg / 11.71 lbs
5309.9 g / 52.1 N
 warning
10 mm 1225 Gs
122.5 mT
 1.48 kg / 3.26 lbs
1480.1 g / 14.5 N
 safe
15 mm 684 Gs
68.4 mT
 0.46 kg / 1.02 lbs
461.6 g / 4.5 N
 safe
20 mm 409 Gs
40.9 mT
 0.16 kg / 0.36 lbs
164.8 g / 1.6 N
 safe
30 mm 173 Gs
17.3 mT
 0.03 kg / 0.07 lbs
29.6 g / 0.3 N
 safe
50 mm 50 Gs
5.0 mT
 0.00 kg / 0.01 lbs
2.4 g / 0.0 N
 safe
Pulling power drops significantly with every mm of gap. Note that even a very thin break (e.g., contamination, varnish, veneer) strongly diminishes the holding power. Neodymiums hold optimally in perfect adhesion; distance kills the force. See how flashily the load capacity fall, when the product does not adhere tightly to the metal substrate. When planning the arrangement, avoid redundant distances.

Table 2: Slippage capacity (wall)
MPL 30x15x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.37 kg / 7.43 lbs
3368.0 g / 33.0 N
1 mm Stal (~0.2) 2.78 kg / 6.12 lbs
2778.0 g / 27.3 N
2 mm Stal (~0.2) 2.23 kg / 4.92 lbs
2232.0 g / 21.9 N
3 mm Stal (~0.2) 1.76 kg / 3.88 lbs
1760.0 g / 17.3 N
5 mm Stal (~0.2) 1.06 kg / 2.34 lbs
1062.0 g / 10.4 N
10 mm Stal (~0.2) 0.30 kg / 0.65 lbs
296.0 g / 2.9 N
15 mm Stal (~0.2) 0.09 kg / 0.20 lbs
92.0 g / 0.9 N
20 mm Stal (~0.2) 0.03 kg / 0.07 lbs
32.0 g / 0.3 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
This section presents the approximate force necessary to start the shifting of the magnet down against a vertical steel plate (assuming typical friction coefficient). The holding force is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MPL 30x15x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.05 kg / 11.14 lbs
5052.0 g / 49.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.37 kg / 7.43 lbs
3368.0 g / 33.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.68 kg / 3.71 lbs
1684.0 g / 16.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.42 kg / 18.56 lbs
8420.0 g / 82.6 N
When mounting a element on a upright wall (e.g., a car body), it you can count on just approx. 1/5 of its nominal power. Gravitational force as well as a low friction coefficient influence the fact that magnets slide down faster than they pop off the substrate. Planning a vertical fastening? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the element will give way down under a significantly smaller cargo. Using a rubber coating can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MPL 30x15x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.84 kg / 1.86 lbs
842.0 g / 8.3 N
1 mm
13%
 2.11 kg / 4.64 lbs
2105.0 g / 20.7 N
2 mm
25%
 4.21 kg / 9.28 lbs
4210.0 g / 41.3 N
3 mm
38%
 6.31 kg / 13.92 lbs
6315.0 g / 62.0 N
5 mm
63%
 10.53 kg / 23.20 lbs
10525.0 g / 103.3 N
10 mm
100%
 16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
11 mm
100%
 16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
12 mm
100%
 16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
A too thin steel is incapable of conduct the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a thin surface, the field will penetrate right through and the holding will be smaller. To squeeze full efficiency of this magnet's power, you need a suitably thick piece of metal. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the product holds weaker. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 30x15x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
 OK
40 °C -2.2% 16.47 kg / 36.31 lbs
16469.5 g / 161.6 N
 OK
60 °C -4.4% 16.10 kg / 35.49 lbs
16099.0 g / 157.9 N
80 °C -6.6% 15.73 kg / 34.68 lbs
15728.6 g / 154.3 N
100 °C -28.8% 11.99 kg / 26.43 lbs
11990.1 g / 117.6 N
Ordinary NdFeB products irreversibly lose strength above the temperature limit. Avoid high temperatures – excessive heat can permanently damage this product. As the temperature rises, the magnet's capacity momentarily lowers. Refrain from using this product close to heaters exceeding its operating temperature limit. Too high temperature will cause permanent loss of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) are more susceptible to demagnetization under lower heat stress than long magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MPL 30x15x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 47.39 kg / 104.48 lbs
5 357 Gs
7.11 kg / 15.67 lbs
7109 g / 69.7 N
 N/A
1 mm 43.23 kg / 95.30 lbs
7 895 Gs
6.48 kg / 14.29 lbs
6484 g / 63.6 N
 38.90 kg / 85.77 lbs
~0 Gs
2 mm 39.09 kg / 86.17 lbs
7 507 Gs
5.86 kg / 12.93 lbs
5863 g / 57.5 N
 35.18 kg / 77.56 lbs
~0 Gs
3 mm 35.13 kg / 77.45 lbs
7 117 Gs
5.27 kg / 11.62 lbs
5270 g / 51.7 N
 31.62 kg / 69.70 lbs
~0 Gs
5 mm 27.95 kg / 61.61 lbs
6 348 Gs
4.19 kg / 9.24 lbs
4192 g / 41.1 N
 25.15 kg / 55.45 lbs
~0 Gs
10 mm 14.94 kg / 32.94 lbs
4 642 Gs
2.24 kg / 4.94 lbs
2242 g / 22.0 N
 13.45 kg / 29.65 lbs
~0 Gs
20 mm 4.17 kg / 9.18 lbs
2 451 Gs
0.62 kg / 1.38 lbs
625 g / 6.1 N
 3.75 kg / 8.26 lbs
~0 Gs
50 mm 0.19 kg / 0.41 lbs
519 Gs
0.03 kg / 0.06 lbs
28 g / 0.3 N
 0.17 kg / 0.37 lbs
~0 Gs
60 mm 0.08 kg / 0.18 lbs
347 Gs
0.01 kg / 0.03 lbs
13 g / 0.1 N
 0.08 kg / 0.17 lbs
~0 Gs
70 mm 0.04 kg / 0.09 lbs
242 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.04 kg / 0.08 lbs
~0 Gs
80 mm 0.02 kg / 0.05 lbs
175 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
90 mm 0.01 kg / 0.03 lbs
130 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
99 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and steel setup. The setup of two magnets produces a massive flux and a larger range of action. Designing a solid fastener? Apply two magnets instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the impact force is extreme. The repulsion force is slightly lower than the attraction, but still large.
*The magnetic induction between like poles drops to ~0 Gs at the geometric center between the magnets (due to field cancellation).
Attention: Estimates demonstrate shear force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 30x15x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.0 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Mechanical watch 20 Gs (2.0 mT) 7.5 cm
Mobile device 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Powerful magnet radiation is a real danger to electronic devices as well as medical implants. These NdFeB products generate a flux that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and plastic. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
MPL 30x15x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.73 km/h
(6.59 m/s)
 0.73 J
30 mm 39.06 km/h
(10.85 m/s)
 1.99 J
50 mm 50.38 km/h
(13.99 m/s)
 3.30 J
100 mm 71.24 km/h
(19.79 m/s)
 6.61 J
Neodymium magnets are very brittle – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can destroy the magnet or injury to skin. Hold the magnet firmly during installation so it doesn't hit violently against the metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Surface protection spec
MPL 30x15x10 / 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 following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MPL 30x15x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 18 390 Mx 183.9 µWb
Pc Coefficient 0.52 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 30x15x10 / N38

Environment Effective steel pull Effect
Air (land) 16.84 kg Standard
Water (riverbed) 19.28 kg
(+2.44 kg buoyancy gain)
+14.5%
Corrosion 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. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds just a fraction of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) significantly reduces 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) = 0.52

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.

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: 020389-2026
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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 30x15x10 mm and a weight of 33.75 g, guarantees the highest quality connection. This rectangular block with a force of 165.22 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.
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 30x15x10 / 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.
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.
For mounting flat magnets MPL 30x15x10 / N38, it is best to use strong epoxy glues (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. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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 (30x15 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 15 mm (width), and 10 mm (thickness). It is a magnetic block with dimensions 30x15x10 mm and a self-weight of 33.75 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.

Advantages

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • Their magnetic field is maintained, and after around 10 years it drops only by ~1% (according to research),
  • They do not lose their magnetic properties even under strong external field,
  • A magnet with a metallic silver surface is more attractive,
  • Magnetic induction on the top side of the magnet remains impressive,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of individual machining as well as adjusting to specific applications,
  • Fundamental importance in advanced technology sectors – they are used in hard drives, electromotive mechanisms, advanced medical instruments, and complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of producing threads in the magnet and complex forms - recommended is casing - magnet mounting.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to complicate diagnosis medical in case of swallowing.
  • Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

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

Information about lifting capacity was defined for the most favorable conditions, assuming:
  • on a base made of structural steel, perfectly concentrating the magnetic flux
  • possessing a thickness of at least 10 mm to avoid saturation
  • with an ground touching surface
  • without the slightest air gap between the magnet and steel
  • under vertical force direction (90-degree angle)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the application force may be lower depending on the following factors, in order of importance:
  • Air gap (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Steel type – mild steel attracts best. Alloy steels reduce magnetic permeability and holding force.
  • Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate decreases the lifting capacity.

Warnings
Magnetic media

Device Safety: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Magnet fragility

Neodymium magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them breaking into small pieces.

Finger safety

Protect your hands. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Choking Hazard

Absolutely store magnets away from children. Risk of swallowing is high, and the effects of magnets connecting inside the body are life-threatening.

Powerful field

Use magnets consciously. Their huge power can shock even professionals. Stay alert and do not underestimate their power.

GPS and phone interference

Note: neodymium magnets produce a field that confuses precision electronics. Maintain a safe distance from your mobile, device, and GPS.

Health Danger

Patients with a pacemaker should maintain an absolute distance from magnets. The magnetic field can disrupt the operation of the life-saving device.

Do not overheat magnets

Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Nickel coating and allergies

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, prevent touching magnets with bare hands or select encased magnets.

Do not drill into magnets

Powder created during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Security! Want to know more? Read our article: Are neodymium magnets dangerous?