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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

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15.62 ZŁ with VAT / pcs + price for transport

12.70 ZŁ net + 23% VAT / pcs

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Technical - 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 assembly - data

The following values are the result of a mathematical simulation. Results were calculated on models for the class Nd2Fe14B. Real-world performance may differ. Treat these data as a reference point for designers.

Table 1: Static force (pull vs gap) - interaction chart
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 lbs
11060.0 g / 108.5 N
 critical level
1 mm 1938 Gs
193.8 mT
 10.05 kg / 22.15 lbs
10049.3 g / 98.6 N
 critical level
2 mm 1823 Gs
182.3 mT
 8.89 kg / 19.60 lbs
8888.2 g / 87.2 N
 strong
3 mm 1696 Gs
169.6 mT
 7.69 kg / 16.96 lbs
7691.7 g / 75.5 N
 strong
5 mm 1433 Gs
143.3 mT
 5.49 kg / 12.10 lbs
5490.3 g / 53.9 N
 strong
10 mm 885 Gs
88.5 mT
 2.09 kg / 4.62 lbs
2093.5 g / 20.5 N
 strong
15 mm 547 Gs
54.7 mT
 0.80 kg / 1.76 lbs
799.6 g / 7.8 N
 safe
20 mm 350 Gs
35.0 mT
 0.33 kg / 0.72 lbs
327.0 g / 3.2 N
 safe
30 mm 160 Gs
16.0 mT
 0.07 kg / 0.15 lbs
68.5 g / 0.7 N
 safe
50 mm 48 Gs
4.8 mT
 0.01 kg / 0.01 lbs
6.2 g / 0.1 N
 safe
Pulling power drops significantly per each millimeter of spacing. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) strongly weakens the grip. Magnets work optimally during direct contact; gap kills the force. Notice how flashily the pull force plummet, when the product does not adhere tightly to the steel surface. When planning the arrangement, eliminate redundant distances.

Table 2: Shear capacity (vertical surface)
MPL 42x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.21 kg / 4.88 lbs
2212.0 g / 21.7 N
1 mm Stal (~0.2) 2.01 kg / 4.43 lbs
2010.0 g / 19.7 N
2 mm Stal (~0.2) 1.78 kg / 3.92 lbs
1778.0 g / 17.4 N
3 mm Stal (~0.2) 1.54 kg / 3.39 lbs
1538.0 g / 15.1 N
5 mm Stal (~0.2) 1.10 kg / 2.42 lbs
1098.0 g / 10.8 N
10 mm Stal (~0.2) 0.42 kg / 0.92 lbs
418.0 g / 4.1 N
15 mm Stal (~0.2) 0.16 kg / 0.35 lbs
160.0 g / 1.6 N
20 mm Stal (~0.2) 0.07 kg / 0.15 lbs
66.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
This section calculates the estimated holding capacity sufficient to initiate the shifting of the magnet downwards along a vertical metal surface (assuming standard friction). This value depends on the air gap between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 lbs
3318.0 g / 32.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.21 kg / 4.88 lbs
2212.0 g / 21.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.11 kg / 2.44 lbs
1106.0 g / 10.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.53 kg / 12.19 lbs
5530.0 g / 54.2 N
When placing a element on a upright plane (e.g., a car body), it will maintain only approx. 1/5 of its maximum pull force. Gravity as well as a weak degree of grip cause that products slide down easier than they pull off. Planning a vertical fastening? Note that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will slide down under a significantly smaller weight. Application of an anti-slip pad can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 42x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.55 kg / 1.22 lbs
553.0 g / 5.4 N
1 mm
13%
 1.38 kg / 3.05 lbs
1382.5 g / 13.6 N
2 mm
25%
 2.77 kg / 6.10 lbs
2765.0 g / 27.1 N
3 mm
38%
 4.15 kg / 9.14 lbs
4147.5 g / 40.7 N
5 mm
63%
 6.91 kg / 15.24 lbs
6912.5 g / 67.8 N
10 mm
100%
 11.06 kg / 24.38 lbs
11060.0 g / 108.5 N
11 mm
100%
 11.06 kg / 24.38 lbs
11060.0 g / 108.5 N
12 mm
100%
 11.06 kg / 24.38 lbs
11060.0 g / 108.5 N
A thin sheet is not enough to absorb the entire magnetic field, which wastes potential of the holder. Should you install a neodymium to a weak sheet, the flux will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's power, you require a sufficiently solid backing of steel. The saturation effect causes that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - thermal limit
MPL 42x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.06 kg / 24.38 lbs
11060.0 g / 108.5 N
 OK
40 °C -2.2% 10.82 kg / 23.85 lbs
10816.7 g / 106.1 N
 OK
60 °C -4.4% 10.57 kg / 23.31 lbs
10573.4 g / 103.7 N
80 °C -6.6% 10.33 kg / 22.77 lbs
10330.0 g / 101.3 N
100 °C -28.8% 7.87 kg / 17.36 lbs
7874.7 g / 77.3 N
Classic neodymiums irreversibly lose strength past the thermal threshold. Protect against heat – heat can permanently demagnetize this magnet. With increasing heat, the neodymium's power temporarily decreases. Avoid using this magnet close to heaters exceeding its operating temperature limit. Exceeding the critical threshold will cause permanent loss of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) are more susceptible to demagnetization sooner than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MPL 42x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 21.41 kg / 47.21 lbs
3 465 Gs
3.21 kg / 7.08 lbs
3212 g / 31.5 N
 N/A
1 mm 20.49 kg / 45.17 lbs
3 978 Gs
3.07 kg / 6.78 lbs
3074 g / 30.2 N
 18.44 kg / 40.66 lbs
~0 Gs
2 mm 19.46 kg / 42.89 lbs
3 877 Gs
2.92 kg / 6.43 lbs
2918 g / 28.6 N
 17.51 kg / 38.60 lbs
~0 Gs
3 mm 18.35 kg / 40.46 lbs
3 765 Gs
2.75 kg / 6.07 lbs
2753 g / 27.0 N
 16.52 kg / 36.41 lbs
~0 Gs
5 mm 16.05 kg / 35.38 lbs
3 521 Gs
2.41 kg / 5.31 lbs
2407 g / 23.6 N
 14.44 kg / 31.84 lbs
~0 Gs
10 mm 10.63 kg / 23.43 lbs
2 865 Gs
1.59 kg / 3.52 lbs
1594 g / 15.6 N
 9.57 kg / 21.09 lbs
~0 Gs
20 mm 4.05 kg / 8.94 lbs
1 769 Gs
0.61 kg / 1.34 lbs
608 g / 6.0 N
 3.65 kg / 8.04 lbs
~0 Gs
50 mm 0.28 kg / 0.62 lbs
465 Gs
0.04 kg / 0.09 lbs
42 g / 0.4 N
 0.25 kg / 0.55 lbs
~0 Gs
60 mm 0.13 kg / 0.29 lbs
320 Gs
0.02 kg / 0.04 lbs
20 g / 0.2 N
 0.12 kg / 0.26 lbs
~0 Gs
70 mm 0.07 kg / 0.15 lbs
228 Gs
0.01 kg / 0.02 lbs
10 g / 0.1 N
 0.06 kg / 0.13 lbs
~0 Gs
80 mm 0.04 kg / 0.08 lbs
167 Gs
0.01 kg / 0.01 lbs
5 g / 0.1 N
 0.03 kg / 0.07 lbs
~0 Gs
90 mm 0.02 kg / 0.04 lbs
125 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
100 mm 0.01 kg / 0.03 lbs
96 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and steel setup. The setup of two magnets generates a stronger field and a wider radius of performance. Want to build a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the collision energy is extreme. The repulsion force is marginally weaker than the attraction, but still significant.
*Field value in repulsion mode reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Note: Results demonstrate shear force of a pair of same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (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
Car key 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
Powerful magnet radiation is a real danger to IT equipment as well as medical implants. These magnets produce a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation acts through matter and housings. Increased vigilance must be taken by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - 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
NdFeB products are delicate – a collision with steel causes immediate chipping. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can cause material chips or painful pinches to skin. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when working with powerful specimens.

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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MPL 42x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 18 614 Mx 186.1 µWb
Pc Coefficient 0.23 Low (Flat)
Total magnetic flux emitted by the pole surface. Key data when building generators and motors. Pc value defines the working geometry.

Table 11: Physics of underwater searching
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds only ~20% of its perpendicular strength.

2. Steel thickness impact

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

3. Heat tolerance

*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
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%
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
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Magnetic Induction
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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 42x20x5 mm and a weight of 31.5 g, guarantees premium class connection. As a block magnet with high power (approx. 11.06 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 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 11.06 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 42x20x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 11.06 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 (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.
This model is characterized by dimensions 42x20x5 mm, which, at a weight of 31.5 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 11.06 kg (force ~108.46 N), which, with such a flat shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of rare earth magnets.

Benefits

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their strength is maintained, and after approximately ten years it decreases only by ~1% (according to research),
  • Magnets perfectly resist against loss of magnetization caused by ambient magnetic noise,
  • The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of exact shaping and adjusting to precise applications,
  • Key role in advanced technology sectors – they find application in computer drives, electric drive systems, medical equipment, also multitasking production systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in realizing threads and complex forms in magnets, we recommend using a housing - magnetic mechanism.
  • Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these products are able to be problematic in diagnostics medical when they are in the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

The force parameter is a measurement result executed under specific, ideal conditions:
  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with a plane free of scratches
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction perpendicular to the mounting surface
  • at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is affected by specific conditions, including (from most important):
  • Air gap (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Steel thickness – insufficiently thick sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Plate material – mild steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Smoothness – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Fire warning

Mechanical processing of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Pinching danger

Big blocks can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Thermal limits

Do not overheat. Neodymium magnets are sensitive to temperature. If you require resistance above 80°C, look for HT versions (H, SH, UH).

Conscious usage

Exercise caution. Rare earth magnets act from a long distance and connect with massive power, often quicker than you can move away.

Nickel allergy

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, immediately stop working with magnets and wear gloves.

Pacemakers

Warning for patients: Strong magnetic fields disrupt electronics. Maintain at least 30 cm distance or request help to work with the magnets.

Keep away from computers

Data protection: Strong magnets can damage payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).

Material brittleness

Watch out for shards. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Phone sensors

GPS units and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Adults only

Neodymium magnets are not intended for children. Swallowing multiple magnets may result in them attracting across intestines, which poses a direct threat to life and requires immediate surgery.

Caution! Need more info? Read our article: Why are neodymium magnets dangerous?