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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 of the product - 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 assembly - data

Presented values are the direct effect of a physical analysis. Results are based on algorithms for the class Nd2Fe14B. Operational performance may differ from theoretical values. Use these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - power drop
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 pounds
16840.0 g / 165.2 N
critical level
1 mm 3754 Gs
375.4 mT
13.89 kg / 30.62 pounds
13889.5 g / 136.3 N
critical level
2 mm 3365 Gs
336.5 mT
11.16 kg / 24.60 pounds
11159.2 g / 109.5 N
critical level
3 mm 2988 Gs
298.8 mT
8.80 kg / 19.41 pounds
8803.6 g / 86.4 N
warning
5 mm 2321 Gs
232.1 mT
5.31 kg / 11.71 pounds
5309.9 g / 52.1 N
warning
10 mm 1225 Gs
122.5 mT
1.48 kg / 3.26 pounds
1480.1 g / 14.5 N
safe
15 mm 684 Gs
68.4 mT
0.46 kg / 1.02 pounds
461.6 g / 4.5 N
safe
20 mm 409 Gs
40.9 mT
0.16 kg / 0.36 pounds
164.8 g / 1.6 N
safe
30 mm 173 Gs
17.3 mT
0.03 kg / 0.07 pounds
29.6 g / 0.3 N
safe
50 mm 50 Gs
5.0 mT
0.00 kg / 0.01 pounds
2.4 g / 0.0 N
safe

Table 2: Sliding 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 pounds
3368.0 g / 33.0 N
1 mm Stal (~0.2) 2.78 kg / 6.12 pounds
2778.0 g / 27.3 N
2 mm Stal (~0.2) 2.23 kg / 4.92 pounds
2232.0 g / 21.9 N
3 mm Stal (~0.2) 1.76 kg / 3.88 pounds
1760.0 g / 17.3 N
5 mm Stal (~0.2) 1.06 kg / 2.34 pounds
1062.0 g / 10.4 N
10 mm Stal (~0.2) 0.30 kg / 0.65 pounds
296.0 g / 2.9 N
15 mm Stal (~0.2) 0.09 kg / 0.20 pounds
92.0 g / 0.9 N
20 mm Stal (~0.2) 0.03 kg / 0.07 pounds
32.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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 pounds
5052.0 g / 49.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.37 kg / 7.43 pounds
3368.0 g / 33.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.68 kg / 3.71 pounds
1684.0 g / 16.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.42 kg / 18.56 pounds
8420.0 g / 82.6 N

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 30x15x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.84 kg / 1.86 pounds
842.0 g / 8.3 N
1 mm
13%
2.11 kg / 4.64 pounds
2105.0 g / 20.7 N
2 mm
25%
4.21 kg / 9.28 pounds
4210.0 g / 41.3 N
3 mm
38%
6.31 kg / 13.92 pounds
6315.0 g / 62.0 N
5 mm
63%
10.53 kg / 23.20 pounds
10525.0 g / 103.3 N
10 mm
100%
16.84 kg / 37.13 pounds
16840.0 g / 165.2 N
11 mm
100%
16.84 kg / 37.13 pounds
16840.0 g / 165.2 N
12 mm
100%
16.84 kg / 37.13 pounds
16840.0 g / 165.2 N

Table 5: Thermal stability (material behavior) - resistance threshold
MPL 30x15x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 16.84 kg / 37.13 pounds
16840.0 g / 165.2 N
OK
40 °C -2.2% 16.47 kg / 36.31 pounds
16469.5 g / 161.6 N
OK
60 °C -4.4% 16.10 kg / 35.49 pounds
16099.0 g / 157.9 N
80 °C -6.6% 15.73 kg / 34.68 pounds
15728.6 g / 154.3 N
100 °C -28.8% 11.99 kg / 26.43 pounds
11990.1 g / 117.6 N

Table 6: Two magnets (repulsion) - field collision
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 pounds
5 357 Gs
7.11 kg / 15.67 pounds
7109 g / 69.7 N
N/A
1 mm 43.23 kg / 95.30 pounds
7 895 Gs
6.48 kg / 14.29 pounds
6484 g / 63.6 N
38.90 kg / 85.77 pounds
~0 Gs
2 mm 39.09 kg / 86.17 pounds
7 507 Gs
5.86 kg / 12.93 pounds
5863 g / 57.5 N
35.18 kg / 77.56 pounds
~0 Gs
3 mm 35.13 kg / 77.45 pounds
7 117 Gs
5.27 kg / 11.62 pounds
5270 g / 51.7 N
31.62 kg / 69.70 pounds
~0 Gs
5 mm 27.95 kg / 61.61 pounds
6 348 Gs
4.19 kg / 9.24 pounds
4192 g / 41.1 N
25.15 kg / 55.45 pounds
~0 Gs
10 mm 14.94 kg / 32.94 pounds
4 642 Gs
2.24 kg / 4.94 pounds
2242 g / 22.0 N
13.45 kg / 29.65 pounds
~0 Gs
20 mm 4.17 kg / 9.18 pounds
2 451 Gs
0.62 kg / 1.38 pounds
625 g / 6.1 N
3.75 kg / 8.26 pounds
~0 Gs
50 mm 0.19 kg / 0.41 pounds
519 Gs
0.03 kg / 0.06 pounds
28 g / 0.3 N
0.17 kg / 0.37 pounds
~0 Gs
60 mm 0.08 kg / 0.18 pounds
347 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
0.08 kg / 0.17 pounds
~0 Gs
70 mm 0.04 kg / 0.09 pounds
242 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
0.04 kg / 0.08 pounds
~0 Gs
80 mm 0.02 kg / 0.05 pounds
175 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.04 pounds
~0 Gs
90 mm 0.01 kg / 0.03 pounds
130 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.02 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
99 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Hazards (electronics) - warnings
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
Timepiece 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: Impact energy (cracking risk) - collision effects
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: 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)

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: Physics of underwater searching
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its nominal pull.

2. Plate thickness effect

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

3. Thermal stability

*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.

Technical specification and ecology
Chemical composition
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
Measurement Calculator
Force (pull)

Magnetic Field

See also offers

Component MPL 30x15x10 / N38 features a flat shape and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 16.84 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.
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 16.84 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. Thanks to the flat surface and high force (approx. 16.84 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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.
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. 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 neodymium magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:
  • They have stable power, and over nearly ten years their attraction force decreases symbolically – ~1% (according to theory),
  • They retain their magnetic properties even under close interference source,
  • In other words, due to the glossy surface of nickel, the element gains a professional look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the option of accurate shaping and adaptation to custom requirements, magnetic components can be modeled in a broad palette of shapes and sizes, which amplifies use scope,
  • Huge importance in electronics industry – they are utilized in data components, drive modules, precision medical tools, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in compact constructions

Cons

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • At strong impacts they can crack, therefore we recommend placing them in special holders. 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 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 immune to moisture, in case of application outdoors
  • Limited possibility of producing nuts in the magnet and complicated shapes - recommended is a housing - magnetic holder.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small components of these products are able to be problematic in diagnostics medical after entering the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat affects it?

The declared magnet strength represents the limit force, measured under laboratory conditions, specifically:
  • on a base made of mild steel, effectively closing the magnetic field
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a plane free of scratches
  • without any air gap between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Magnet lifting force in use – key factors

Real force is affected by specific conditions, such as (from priority):
  • Distance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
  • Surface finish – full contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Warnings
Precision electronics

Navigation devices and mobile phones are extremely susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Finger safety

Protect your hands. Two large magnets will snap together immediately with a force of massive weight, crushing anything in their path. Be careful!

Fire warning

Fire hazard: Neodymium dust is explosive. Do not process magnets in home conditions as this may cause fire.

Cards and drives

Avoid bringing magnets near a wallet, laptop, or TV. The magnetism can destroy these devices and erase data from cards.

Sensitization to coating

It is widely known that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, avoid direct skin contact or opt for coated magnets.

Product not for children

Product intended for adults. Small elements can be swallowed, leading to intestinal necrosis. Store away from children and animals.

Heat sensitivity

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Medical implants

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Powerful field

Handle with care. Rare earth magnets attract from a distance and connect with huge force, often quicker than you can move away.

Beware of splinters

Protect your eyes. Magnets can explode upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Attention! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98