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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

24.48 with VAT / pcs + price for transport

19.90 ZŁ net + 23% VAT / pcs

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Technical - 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

Engineering analysis of the product - data

The following data constitute the direct effect of a engineering analysis. Results rely on algorithms for the class Nd2Fe14B. Actual performance might slightly differ from theoretical values. Please consider these data as a preliminary roadmap for designers.

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
strong
5 mm 2321 Gs
232.1 mT
5.31 kg / 11.71 LBS
5309.9 g / 52.1 N
strong
10 mm 1225 Gs
122.5 mT
1.48 kg / 3.26 LBS
1480.1 g / 14.5 N
weak grip
15 mm 684 Gs
68.4 mT
0.46 kg / 1.02 LBS
461.6 g / 4.5 N
weak grip
20 mm 409 Gs
40.9 mT
0.16 kg / 0.36 LBS
164.8 g / 1.6 N
weak grip
30 mm 173 Gs
17.3 mT
0.03 kg / 0.07 LBS
29.6 g / 0.3 N
weak grip
50 mm 50 Gs
5.0 mT
0.00 kg / 0.01 LBS
2.4 g / 0.0 N
weak grip

Table 2: Shear hold (vertical surface)
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

Table 3: Vertical assembly (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

Table 4: Steel thickness (saturation) - 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

Table 5: Thermal resistance (material behavior) - power drop
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

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 30x15x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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

Table 7: Hazards (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
Car key 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

Table 8: Dynamics (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

Table 9: Corrosion resistance
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)

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

Parameter Value SI Unit / Description
Magnetic Flux 18 390 Mx 183.9 µWb
Pc Coefficient 0.52 Low (Flat)

Table 11: Underwater work (magnet fishing)
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains merely a fraction of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) severely reduces the holding force.

3. Power loss vs temp

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.52

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
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: 020389-2026
Magnet Unit Converter
Magnet pull force

Magnetic Field

See also products

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 premium class connection. As a magnetic bar with high power (approx. 16.84 kg), this product is available off-the-shelf 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 16.84 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 30x15x10 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 16.84 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 30x15x10 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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 30x15x10 / N38 model is magnetized axially (dimension 10 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 (30x15 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 30x15x10 mm, which, at a weight of 33.75 g, makes it an element with high energy density. 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 product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
  • Neodymium magnets are remarkably resistant to magnetic field loss caused by magnetic disturbances,
  • A magnet with a metallic silver surface is more attractive,
  • Neodymium magnets generate maximum magnetic induction on a small area, which allows for strong attraction,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • In view of the possibility of precise molding and customization to custom requirements, magnetic components can be created in a wide range of forms and dimensions, which expands the range of possible applications,
  • Versatile presence in high-tech industry – they are utilized in hard drives, brushless drives, diagnostic systems, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength 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
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complex forms in magnets, we propose using cover - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Magnetic strength at its maximum – what affects it?

Magnet power is the result of a measurement for optimal configuration, assuming:
  • using a base made of mild steel, serving as a magnetic yoke
  • with a cross-section minimum 10 mm
  • with a surface cleaned and smooth
  • under conditions of gap-free contact (surface-to-surface)
  • during detachment in a direction perpendicular to the plane
  • at ambient temperature room level

Lifting capacity in real conditions – factors

During everyday use, the actual lifting capacity results from several key aspects, listed from most significant:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Plate material – mild steel attracts best. Alloy steels reduce magnetic permeability and holding force.
  • Surface finish – ideal contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Finger safety

Danger of trauma: The attraction force is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Maximum temperature

Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Magnetic interference

Note: rare earth magnets generate a field that confuses sensitive sensors. Maintain a safe distance from your phone, tablet, and navigation systems.

Sensitization to coating

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If skin irritation appears, immediately stop handling magnets and wear gloves.

Protective goggles

Watch out for shards. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Handling guide

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Danger to pacemakers

Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Product not for children

Only for adults. Tiny parts can be swallowed, causing severe trauma. Keep away from kids and pets.

Magnetic media

Equipment safety: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, timepieces).

Mechanical processing

Dust produced during cutting of magnets is flammable. Do not drill into magnets unless you are an expert.

Safety First! Need more info? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98