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MPL 30x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020141

GTIN/EAN: 5906301811473

5.00
Load capacity 19.53 kg / 191.55 N Magnetic Induction 371.57 mT / 3716 Gs
length
30 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
45 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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Net
Gross
price from 1 pcs
13.10 zł
16.11 zł
price from 50 pcs
12.31 zł
15.15 zł
price from 200 pcs
11.53 zł
14.18 zł

Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical - MPL 30x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020141
GTIN/EAN 5906301811473
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 20 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 45 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.53 kg / 191.55 N
Magnetic Induction ~ ? 371.57 mT / 3716 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x10 / N38 - lamellar magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 simulation of the product - report

The following data are the result of a engineering analysis. Results were calculated on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ. Please consider these calculations as a reference point for designers.

Table 1: Static force (force vs distance) - characteristics
MPL 30x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3715 Gs
371.5 mT
19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
dangerous!
1 mm 3464 Gs
346.4 mT
16.98 kg / 37.44 pounds
16983.1 g / 166.6 N
dangerous!
2 mm 3197 Gs
319.7 mT
14.47 kg / 31.89 pounds
14466.6 g / 141.9 N
dangerous!
3 mm 2927 Gs
292.7 mT
12.12 kg / 26.73 pounds
12123.3 g / 118.9 N
dangerous!
5 mm 2408 Gs
240.8 mT
8.21 kg / 18.10 pounds
8207.8 g / 80.5 N
strong
10 mm 1411 Gs
141.1 mT
2.82 kg / 6.21 pounds
2815.6 g / 27.6 N
strong
15 mm 832 Gs
83.2 mT
0.98 kg / 2.16 pounds
979.7 g / 9.6 N
low risk
20 mm 512 Gs
51.2 mT
0.37 kg / 0.82 pounds
371.2 g / 3.6 N
low risk
30 mm 224 Gs
22.4 mT
0.07 kg / 0.16 pounds
70.7 g / 0.7 N
low risk
50 mm 65 Gs
6.5 mT
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
low risk

Table 2: Vertical capacity (vertical surface)
MPL 30x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.91 kg / 8.61 pounds
3906.0 g / 38.3 N
1 mm Stal (~0.2) 3.40 kg / 7.49 pounds
3396.0 g / 33.3 N
2 mm Stal (~0.2) 2.89 kg / 6.38 pounds
2894.0 g / 28.4 N
3 mm Stal (~0.2) 2.42 kg / 5.34 pounds
2424.0 g / 23.8 N
5 mm Stal (~0.2) 1.64 kg / 3.62 pounds
1642.0 g / 16.1 N
10 mm Stal (~0.2) 0.56 kg / 1.24 pounds
564.0 g / 5.5 N
15 mm Stal (~0.2) 0.20 kg / 0.43 pounds
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.07 kg / 0.16 pounds
74.0 g / 0.7 N
30 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 30x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.86 kg / 12.92 pounds
5859.0 g / 57.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.91 kg / 8.61 pounds
3906.0 g / 38.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.95 kg / 4.31 pounds
1953.0 g / 19.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.77 kg / 21.53 pounds
9765.0 g / 95.8 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 30x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.98 kg / 2.15 pounds
976.5 g / 9.6 N
1 mm
13%
2.44 kg / 5.38 pounds
2441.3 g / 23.9 N
2 mm
25%
4.88 kg / 10.76 pounds
4882.5 g / 47.9 N
3 mm
38%
7.32 kg / 16.15 pounds
7323.8 g / 71.8 N
5 mm
63%
12.21 kg / 26.91 pounds
12206.3 g / 119.7 N
10 mm
100%
19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
11 mm
100%
19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
12 mm
100%
19.53 kg / 43.06 pounds
19530.0 g / 191.6 N

Table 5: Thermal stability (stability) - thermal limit
MPL 30x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
OK
40 °C -2.2% 19.10 kg / 42.11 pounds
19100.3 g / 187.4 N
OK
60 °C -4.4% 18.67 kg / 41.16 pounds
18670.7 g / 183.2 N
80 °C -6.6% 18.24 kg / 40.21 pounds
18241.0 g / 178.9 N
100 °C -28.8% 13.91 kg / 30.66 pounds
13905.4 g / 136.4 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 30x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 51.05 kg / 112.54 pounds
5 124 Gs
7.66 kg / 16.88 pounds
7657 g / 75.1 N
N/A
1 mm 47.76 kg / 105.28 pounds
7 186 Gs
7.16 kg / 15.79 pounds
7163 g / 70.3 N
42.98 kg / 94.76 pounds
~0 Gs
2 mm 44.39 kg / 97.86 pounds
6 928 Gs
6.66 kg / 14.68 pounds
6658 g / 65.3 N
39.95 kg / 88.08 pounds
~0 Gs
3 mm 41.06 kg / 90.52 pounds
6 663 Gs
6.16 kg / 13.58 pounds
6159 g / 60.4 N
36.95 kg / 81.47 pounds
~0 Gs
5 mm 34.68 kg / 76.45 pounds
6 124 Gs
5.20 kg / 11.47 pounds
5202 g / 51.0 N
31.21 kg / 68.81 pounds
~0 Gs
10 mm 21.45 kg / 47.30 pounds
4 817 Gs
3.22 kg / 7.09 pounds
3218 g / 31.6 N
19.31 kg / 42.57 pounds
~0 Gs
20 mm 7.36 kg / 16.22 pounds
2 821 Gs
1.10 kg / 2.43 pounds
1104 g / 10.8 N
6.62 kg / 14.60 pounds
~0 Gs
50 mm 0.40 kg / 0.89 pounds
662 Gs
0.06 kg / 0.13 pounds
61 g / 0.6 N
0.36 kg / 0.80 pounds
~0 Gs
60 mm 0.18 kg / 0.41 pounds
447 Gs
0.03 kg / 0.06 pounds
28 g / 0.3 N
0.17 kg / 0.37 pounds
~0 Gs
70 mm 0.09 kg / 0.20 pounds
314 Gs
0.01 kg / 0.03 pounds
14 g / 0.1 N
0.08 kg / 0.18 pounds
~0 Gs
80 mm 0.05 kg / 0.11 pounds
228 Gs
0.01 kg / 0.02 pounds
7 g / 0.1 N
0.04 kg / 0.10 pounds
~0 Gs
90 mm 0.03 kg / 0.06 pounds
170 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
0.02 kg / 0.05 pounds
~0 Gs
100 mm 0.02 kg / 0.03 pounds
130 Gs
0.00 kg / 0.01 pounds
2 g / 0.0 N
0.01 kg / 0.03 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 30x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.0 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 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 30x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.90 km/h
(6.36 m/s)
0.91 J
30 mm 24.51 km/h
(6.81 m/s)
1.04 J
50 mm 24.56 km/h
(6.82 m/s)
1.05 J
100 mm 24.57 km/h
(6.83 m/s)
1.05 J

Table 9: Coating parameters (durability)
MPL 30x20x10 / 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 (Flux)
MPL 30x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 801 Mx 228.0 µWb
Pc Coefficient 0.46 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 30x20x10 / N38

Environment Effective steel pull Effect
Air (land) 19.53 kg Standard
Water (riverbed) 22.36 kg
(+2.83 kg buoyancy gain)
+14.5%
Warning: 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 retains just ~20% of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Temperature resistance

*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) = 0.46

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.

Technical specification and ecology

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: 020141-2026
Magnet Unit Converter

Pulling force


Field Strength

Other offers

Model MPL 30x20x10 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 191.55 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.
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. To separate the MPL 30x20x10 / 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.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 19.53 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.
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.
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 (30x20 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.
The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 20 mm (width), and 10 mm (thickness). It is a magnetic block with dimensions 30x20x10 mm and a self-weight of 45 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of rare earth magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • A magnet with a smooth silver surface has an effective appearance,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which allows for strong attraction,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to freedom in designing and the capacity to customize to complex applications,
  • Versatile presence in modern industrial fields – they serve a role in mass storage devices, electromotive mechanisms, diagnostic systems, also technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets: application proposals
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. 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
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing nuts in the magnet and complicated forms - preferred is cover - magnet mounting.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Highest magnetic holding forcewhat contributes to it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, taking into account:
  • on a plate made of structural steel, effectively closing the magnetic field
  • with a thickness minimum 10 mm
  • with a surface perfectly flat
  • without any clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Determinants of practical lifting force of a magnet

Real force is influenced by working environment parameters, including (from most important):
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Material type – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Metal Allergy

A percentage of the population have a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Extended handling can result in dermatitis. It is best to wear safety gloves.

Bone fractures

Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Keep away from electronics

Remember: neodymium magnets produce a field that disrupts sensitive sensors. Keep a safe distance from your mobile, device, and GPS.

Do not underestimate power

Exercise caution. Rare earth magnets act from a long distance and connect with huge force, often faster than you can react.

Safe distance

Equipment safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, timepieces).

Fragile material

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

Fire warning

Dust generated during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Heat sensitivity

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. Damage is permanent.

This is not a toy

NdFeB magnets are not toys. Accidental ingestion of multiple magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and necessitates urgent medical intervention.

Pacemakers

Patients with a ICD must maintain an safe separation from magnets. The magnetic field can stop the operation of the implant.

Security! Looking for details? Read our article: Are neodymium magnets dangerous?