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MPL 42x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020163

GTIN/EAN: 5906301811695

5.00

length

42 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

31.5 g

Magnetization Direction

↑ axial

Load capacity

11.06 kg / 108.46 N

Magnetic Induction

203.37 mT / 2034 Gs

Coating

[NiCuNi] Nickel

15.62 with VAT / pcs + price for transport

12.70 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 42x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 42x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020163
GTIN/EAN 5906301811695
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 42 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 31.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.06 kg / 108.46 N
Magnetic Induction ~ ? 203.37 mT / 2034 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 42x20x5 / 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

Physical modeling of the product - data

The following data are the outcome of a physical analysis. Values are based on models for the class Nd2Fe14B. Real-world performance may differ. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - power drop
MPL 42x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2033 Gs
203.3 mT
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
critical level
1 mm 1938 Gs
193.8 mT
10.05 kg / 22.15 pounds
10049.3 g / 98.6 N
critical level
2 mm 1823 Gs
182.3 mT
8.89 kg / 19.60 pounds
8888.2 g / 87.2 N
strong
3 mm 1696 Gs
169.6 mT
7.69 kg / 16.96 pounds
7691.7 g / 75.5 N
strong
5 mm 1433 Gs
143.3 mT
5.49 kg / 12.10 pounds
5490.3 g / 53.9 N
strong
10 mm 885 Gs
88.5 mT
2.09 kg / 4.62 pounds
2093.5 g / 20.5 N
strong
15 mm 547 Gs
54.7 mT
0.80 kg / 1.76 pounds
799.6 g / 7.8 N
weak grip
20 mm 350 Gs
35.0 mT
0.33 kg / 0.72 pounds
327.0 g / 3.2 N
weak grip
30 mm 160 Gs
16.0 mT
0.07 kg / 0.15 pounds
68.5 g / 0.7 N
weak grip
50 mm 48 Gs
4.8 mT
0.01 kg / 0.01 pounds
6.2 g / 0.1 N
weak grip

Table 2: Vertical capacity (wall)
MPL 42x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.21 kg / 4.88 pounds
2212.0 g / 21.7 N
1 mm Stal (~0.2) 2.01 kg / 4.43 pounds
2010.0 g / 19.7 N
2 mm Stal (~0.2) 1.78 kg / 3.92 pounds
1778.0 g / 17.4 N
3 mm Stal (~0.2) 1.54 kg / 3.39 pounds
1538.0 g / 15.1 N
5 mm Stal (~0.2) 1.10 kg / 2.42 pounds
1098.0 g / 10.8 N
10 mm Stal (~0.2) 0.42 kg / 0.92 pounds
418.0 g / 4.1 N
15 mm Stal (~0.2) 0.16 kg / 0.35 pounds
160.0 g / 1.6 N
20 mm Stal (~0.2) 0.07 kg / 0.15 pounds
66.0 g / 0.6 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 (sliding) - vertical pull
MPL 42x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.32 kg / 7.31 pounds
3318.0 g / 32.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.21 kg / 4.88 pounds
2212.0 g / 21.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.11 kg / 2.44 pounds
1106.0 g / 10.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.53 kg / 12.19 pounds
5530.0 g / 54.2 N

Table 4: Material efficiency (saturation) - power losses
MPL 42x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.55 kg / 1.22 pounds
553.0 g / 5.4 N
1 mm
13%
1.38 kg / 3.05 pounds
1382.5 g / 13.6 N
2 mm
25%
2.77 kg / 6.10 pounds
2765.0 g / 27.1 N
3 mm
38%
4.15 kg / 9.14 pounds
4147.5 g / 40.7 N
5 mm
63%
6.91 kg / 15.24 pounds
6912.5 g / 67.8 N
10 mm
100%
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
11 mm
100%
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
12 mm
100%
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N

Table 5: Thermal stability (material behavior) - power drop
MPL 42x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
OK
40 °C -2.2% 10.82 kg / 23.85 pounds
10816.7 g / 106.1 N
OK
60 °C -4.4% 10.57 kg / 23.31 pounds
10573.4 g / 103.7 N
80 °C -6.6% 10.33 kg / 22.77 pounds
10330.0 g / 101.3 N
100 °C -28.8% 7.87 kg / 17.36 pounds
7874.7 g / 77.3 N

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 42x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 21.41 kg / 47.21 pounds
3 465 Gs
3.21 kg / 7.08 pounds
3212 g / 31.5 N
N/A
1 mm 20.49 kg / 45.17 pounds
3 978 Gs
3.07 kg / 6.78 pounds
3074 g / 30.2 N
18.44 kg / 40.66 pounds
~0 Gs
2 mm 19.46 kg / 42.89 pounds
3 877 Gs
2.92 kg / 6.43 pounds
2918 g / 28.6 N
17.51 kg / 38.60 pounds
~0 Gs
3 mm 18.35 kg / 40.46 pounds
3 765 Gs
2.75 kg / 6.07 pounds
2753 g / 27.0 N
16.52 kg / 36.41 pounds
~0 Gs
5 mm 16.05 kg / 35.38 pounds
3 521 Gs
2.41 kg / 5.31 pounds
2407 g / 23.6 N
14.44 kg / 31.84 pounds
~0 Gs
10 mm 10.63 kg / 23.43 pounds
2 865 Gs
1.59 kg / 3.52 pounds
1594 g / 15.6 N
9.57 kg / 21.09 pounds
~0 Gs
20 mm 4.05 kg / 8.94 pounds
1 769 Gs
0.61 kg / 1.34 pounds
608 g / 6.0 N
3.65 kg / 8.04 pounds
~0 Gs
50 mm 0.28 kg / 0.62 pounds
465 Gs
0.04 kg / 0.09 pounds
42 g / 0.4 N
0.25 kg / 0.55 pounds
~0 Gs
60 mm 0.13 kg / 0.29 pounds
320 Gs
0.02 kg / 0.04 pounds
20 g / 0.2 N
0.12 kg / 0.26 pounds
~0 Gs
70 mm 0.07 kg / 0.15 pounds
228 Gs
0.01 kg / 0.02 pounds
10 g / 0.1 N
0.06 kg / 0.13 pounds
~0 Gs
80 mm 0.04 kg / 0.08 pounds
167 Gs
0.01 kg / 0.01 pounds
5 g / 0.1 N
0.03 kg / 0.07 pounds
~0 Gs
90 mm 0.02 kg / 0.04 pounds
125 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.04 pounds
~0 Gs
100 mm 0.01 kg / 0.03 pounds
96 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.02 pounds
~0 Gs

Table 7: Protective zones (implants) - warnings
MPL 42x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.5 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Collisions (kinetic energy) - collision effects
MPL 42x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.01 km/h
(5.84 m/s)
0.54 J
30 mm 32.86 km/h
(9.13 m/s)
1.31 J
50 mm 42.27 km/h
(11.74 m/s)
2.17 J
100 mm 59.76 km/h
(16.60 m/s)
4.34 J

Table 9: Surface protection spec
MPL 42x20x5 / 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 (Flux)
MPL 42x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 18 614 Mx 186.1 µWb
Pc Coefficient 0.23 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 42x20x5 / N38

Environment Effective steel pull Effect
Air (land) 11.06 kg Standard
Water (riverbed) 12.66 kg
(+1.60 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. Vertical hold

*Note: On a vertical wall, the magnet holds just a fraction of its max power.

2. Efficiency vs thickness

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

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.23

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%
Environmental data
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: 020163-2026
Quick Unit Converter
Force (pull)

Field Strength

Other offers

Component MPL 42x20x5 / 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. 11.06 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. To separate the MPL 42x20x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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. They work great as fasteners under tiles, wood, or glass. 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. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. 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 (42x20 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: 42 mm (length), 20 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 42x20x5 mm and a self-weight of 31.5 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Benefits

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • A magnet with a shiny silver surface has better aesthetics,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to versatility in shaping and the ability to customize to complex applications,
  • Significant place in innovative solutions – they are commonly used in magnetic memories, electric drive systems, precision medical tools, and complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its 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 and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in producing threads and complex shapes in magnets, we propose using cover - magnetic holder.
  • Health risk 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 elements of these products can disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Lifting parameters

Maximum magnetic pulling forcewhat affects it?

Breakaway force was defined for the most favorable conditions, including:
  • using a base made of mild steel, serving as a circuit closing element
  • with a thickness of at least 10 mm
  • with a plane cleaned and smooth
  • under conditions of gap-free contact (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • at room temperature

Key elements affecting lifting force

Effective lifting capacity is affected by working environment parameters, such as (from priority):
  • Air gap (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface quality – the more even the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate decreases the load capacity.

Safe handling of NdFeB magnets
Material brittleness

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets leads to them breaking into shards.

Crushing force

Pinching hazard: The attraction force is so great that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.

Do not drill into magnets

Machining of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Swallowing risk

Neodymium magnets are not suitable for play. Accidental ingestion of a few magnets may result in them pinching intestinal walls, which poses a critical condition and necessitates immediate surgery.

Heat warning

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

Implant safety

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Phone sensors

An intense magnetic field disrupts the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to prevent damaging the sensors.

Nickel coating and allergies

Some people experience a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Extended handling might lead to skin redness. We strongly advise use protective gloves.

Threat to electronics

Avoid bringing magnets near a purse, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Handling guide

Be careful. Rare earth magnets act from a distance and snap with huge force, often faster than you can react.

Attention! Looking for details? Check our post: Why are neodymium magnets dangerous?