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MPL 20x5x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020131

GTIN/EAN: 5906301811374

5.00
Load capacity 3.46 kg / 33.93 N Magnetic Induction 358.88 mT / 3589 Gs
length
20 mm [±0,1 mm]
Width
5 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
2.25 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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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 20x5x3 / N38 - lamellar magnet

Specification / characteristics - MPL 20x5x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020131
GTIN/EAN 5906301811374
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 20 mm [±0,1 mm]
Width 5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 2.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.46 kg / 33.93 N
Magnetic Induction ~ ? 358.88 mT / 3589 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x5x3 / 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

Physical modeling of the assembly - data

The following information are the result of a mathematical simulation. Results were calculated on algorithms for the material Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Use these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
MPL 20x5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3585 Gs
358.5 mT
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
strong
1 mm 2619 Gs
261.9 mT
1.85 kg / 4.07 lbs
1846.6 g / 18.1 N
low risk
2 mm 1818 Gs
181.8 mT
0.89 kg / 1.96 lbs
889.8 g / 8.7 N
low risk
3 mm 1279 Gs
127.9 mT
0.44 kg / 0.97 lbs
440.2 g / 4.3 N
low risk
5 mm 696 Gs
69.6 mT
0.13 kg / 0.29 lbs
130.6 g / 1.3 N
low risk
10 mm 225 Gs
22.5 mT
0.01 kg / 0.03 lbs
13.6 g / 0.1 N
low risk
15 mm 97 Gs
9.7 mT
0.00 kg / 0.01 lbs
2.5 g / 0.0 N
low risk
20 mm 49 Gs
4.9 mT
0.00 kg / 0.00 lbs
0.6 g / 0.0 N
low risk
30 mm 17 Gs
1.7 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
low risk
50 mm 4 Gs
0.4 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk

Table 2: Shear load (wall)
MPL 20x5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.69 kg / 1.53 lbs
692.0 g / 6.8 N
1 mm Stal (~0.2) 0.37 kg / 0.82 lbs
370.0 g / 3.6 N
2 mm Stal (~0.2) 0.18 kg / 0.39 lbs
178.0 g / 1.7 N
3 mm Stal (~0.2) 0.09 kg / 0.19 lbs
88.0 g / 0.9 N
5 mm Stal (~0.2) 0.03 kg / 0.06 lbs
26.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 20x5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.04 kg / 2.29 lbs
1038.0 g / 10.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.69 kg / 1.53 lbs
692.0 g / 6.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.35 kg / 0.76 lbs
346.0 g / 3.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.73 kg / 3.81 lbs
1730.0 g / 17.0 N

Table 4: Steel thickness (saturation) - power losses
MPL 20x5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.35 kg / 0.76 lbs
346.0 g / 3.4 N
1 mm
25%
0.87 kg / 1.91 lbs
865.0 g / 8.5 N
2 mm
50%
1.73 kg / 3.81 lbs
1730.0 g / 17.0 N
3 mm
75%
2.59 kg / 5.72 lbs
2595.0 g / 25.5 N
5 mm
100%
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
10 mm
100%
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
11 mm
100%
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
12 mm
100%
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 20x5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
OK
40 °C -2.2% 3.38 kg / 7.46 lbs
3383.9 g / 33.2 N
OK
60 °C -4.4% 3.31 kg / 7.29 lbs
3307.8 g / 32.4 N
80 °C -6.6% 3.23 kg / 7.12 lbs
3231.6 g / 31.7 N
100 °C -28.8% 2.46 kg / 5.43 lbs
2463.5 g / 24.2 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 20x5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 7.92 kg / 17.47 lbs
4 860 Gs
1.19 kg / 2.62 lbs
1189 g / 11.7 N
N/A
1 mm 5.94 kg / 13.10 lbs
6 209 Gs
0.89 kg / 1.97 lbs
891 g / 8.7 N
5.35 kg / 11.79 lbs
~0 Gs
2 mm 4.23 kg / 9.32 lbs
5 238 Gs
0.63 kg / 1.40 lbs
634 g / 6.2 N
3.81 kg / 8.39 lbs
~0 Gs
3 mm 2.94 kg / 6.49 lbs
4 369 Gs
0.44 kg / 0.97 lbs
441 g / 4.3 N
2.65 kg / 5.84 lbs
~0 Gs
5 mm 1.42 kg / 3.14 lbs
3 039 Gs
0.21 kg / 0.47 lbs
213 g / 2.1 N
1.28 kg / 2.82 lbs
~0 Gs
10 mm 0.30 kg / 0.66 lbs
1 393 Gs
0.04 kg / 0.10 lbs
45 g / 0.4 N
0.27 kg / 0.59 lbs
~0 Gs
20 mm 0.03 kg / 0.07 lbs
450 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
0.03 kg / 0.06 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
56 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
34 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
23 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
16 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
11 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
8 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MPL 20x5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - warning
MPL 20x5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.51 km/h
(6.81 m/s)
0.05 J
30 mm 24.60 km/h
(6.83 m/s)
0.05 J
50 mm 24.60 km/h
(6.83 m/s)
0.05 J
100 mm 24.61 km/h
(6.84 m/s)
0.05 J

Table 9: Coating parameters (durability)
MPL 20x5x3 / 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: Electrical data (Pc)
MPL 20x5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 197 Mx 32.0 µWb
Pc Coefficient 0.36 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 20x5x3 / N38

Environment Effective steel pull Effect
Air (land) 3.46 kg Standard
Water (riverbed) 3.96 kg
(+0.50 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)

*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

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

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.36

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 and environmental data

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%

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: 020131-2026
Quick Unit Converter

Pulling force


Field Strength

Other products

Model MPL 20x5x3 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 3.46 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 20x5x3 / 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.
Plate magnets MPL 20x5x3 / 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. 3.46 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 20x5x3 / 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.
Standardly, the MPL 20x5x3 / N38 model is magnetized axially (dimension 3 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 (20x5 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: 20 mm (length), 5 mm (width), and 3 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 3.46 kg (force ~33.93 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of Nd2Fe14B magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • Their magnetic field is maintained, and after around 10 years it drops only by ~1% (theoretically),
  • They maintain their magnetic properties even under strong external field,
  • Thanks to the glossy finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to flexibility in designing and the ability to adapt to specific needs,
  • Universal use in modern industrial fields – they are used in magnetic memories, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in miniature devices

Weaknesses

Problematic aspects of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited ability of making nuts in the magnet and complicated forms - recommended is a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these magnets are able to complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum magnetic pulling forcewhat contributes to it?

The load parameter shown represents the limit force, recorded under laboratory conditions, namely:
  • on a base made of structural steel, optimally conducting the magnetic field
  • with a thickness minimum 10 mm
  • characterized by even structure
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction vertical to the plane
  • at temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Effective lifting capacity is influenced by specific conditions, including (from priority):
  • Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface finish – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets
Sensitization to coating

Certain individuals have a hypersensitivity to Ni, which is the common plating for neodymium magnets. Frequent touching may cause a rash. We suggest use safety gloves.

Life threat

Patients with a heart stimulator must maintain an large gap from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Electronic hazard

Equipment safety: Strong magnets can damage data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).

Keep away from electronics

GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Demagnetization risk

Do not overheat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Swallowing risk

Only for adults. Small elements pose a choking risk, causing serious injuries. Keep out of reach of children and animals.

Crushing risk

Protect your hands. Two powerful magnets will snap together instantly with a force of massive weight, destroying everything in their path. Be careful!

Dust is flammable

Fire hazard: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Conscious usage

Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Beware of splinters

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Warning! More info about hazards in the article: Magnet Safety Guide.