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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

technical parameters »

15.62 ZŁ with VAT / pcs + price for transport

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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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Specifications and structure of neodymium magnets can be reviewed with our online calculation tool.

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Physical properties - 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

Engineering modeling of the assembly - data

These data represent the direct effect of a engineering analysis. Values are based on algorithms for the material Nd2Fe14B. Actual parameters may deviate from the simulation results. Use these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs gap) - 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
 crushing
1 mm 1938 Gs
193.8 mT
 10.05 kg / 22.15 pounds
10049.3 g / 98.6 N
 crushing
2 mm 1823 Gs
182.3 mT
 8.89 kg / 19.60 pounds
8888.2 g / 87.2 N
 warning
3 mm 1696 Gs
169.6 mT
 7.69 kg / 16.96 pounds
7691.7 g / 75.5 N
 warning
5 mm 1433 Gs
143.3 mT
 5.49 kg / 12.10 pounds
5490.3 g / 53.9 N
 warning
10 mm 885 Gs
88.5 mT
 2.09 kg / 4.62 pounds
2093.5 g / 20.5 N
 warning
15 mm 547 Gs
54.7 mT
 0.80 kg / 1.76 pounds
799.6 g / 7.8 N
 safe
20 mm 350 Gs
35.0 mT
 0.33 kg / 0.72 pounds
327.0 g / 3.2 N
 safe
30 mm 160 Gs
16.0 mT
 0.07 kg / 0.15 pounds
68.5 g / 0.7 N
 safe
50 mm 48 Gs
4.8 mT
 0.01 kg / 0.01 pounds
6.2 g / 0.1 N
 safe
Grip strength weakens drastically per each millimeter of spacing. Note that even the smallest gap (e.g., contamination, varnish, dust) significantly diminishes the holding power. Magnets operate optimally during direct contact; air break drastically cuts the power. Analyze how quickly the load capacity fall, when the product does not adhere tightly to the metal substrate. When designing the assembly, avoid unnecessary gaps.

Table 2: Vertical hold (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
The following data indicates the theoretical shear load necessary to initiate the downward movement of the magnet down against a upright steel plate (assuming standard friction). This parameter varies with the separation distance between the magnet and the surface.

Table 3: Wall mounting (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 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
When placing a magnet on a vertical surface (e.g., a board), it you can count on only about 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient influence the fact that magnets move down easier than they pull off. Want to create a wall mount? Consider that the shear force is much weaker than the maximum static pull force. On a painted metal, the magnet will slide down under a much lighter cargo. Utilizing a rubberized coating can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - 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
A too thin steel cannot take in the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To achieve the maximum of this magnet's power, you need a suitably thick element of steel. The saturation phenomenon causes that on thin elements (e.g., car bodies), the holder holds weaker. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (material behavior) - 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 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
Standard neodymium magnets change their properties strength past the thermal threshold. Watch out for overheating – excessive heat can permanently demagnetize this product. With increasing heat, the magnet's power briefly decreases. Avoid using this product in hot environments higher than its safe range. Too high temperature will lead to destruction of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 42x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (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
Two magnets attract each other from a much further distance than a magnet and steel combination. The setup of two magnets produces a massive flux and a larger range of operation. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the pinch force is huge. The levitation is marginally weaker than the attraction, but still significant.
*Field value for N-N configuration reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Estimates refer to friction force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 7.0 cm
Mobile device 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
A strong magnetic field is a large risk to electronic devices as well as medical implants. These neodymiums produce a flux that destroys function of sensitive medical devices. Remember: the unseen radiation penetrates the body and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, 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
Neodymium magnets are very brittle – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction 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. Essential parameter when building generators as well as sensors. Pc value defines the working geometry.

Table 11: Hydrostatics and buoyancy
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!
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) severely limits 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) = 0.23

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
Elemental analysis
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: 020163-2026
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Model MPL 42x20x5 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 11.06 kg), this product is available off-the-shelf from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 11.06 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 generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 42x20x5 / N38, we recommend utilizing 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.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. 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: 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.

Pros as well as cons of Nd2Fe14B magnets.

Benefits

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have constant strength, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • Neodymium magnets are distinguished by remarkably resistant to loss of magnetic properties caused by external interference,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnets are characterized by maximum magnetic induction on the working surface,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
  • Thanks to versatility in forming and the ability to adapt to client solutions,
  • Versatile presence in high-tech industry – they serve a role in magnetic memories, motor assemblies, medical equipment, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in miniature devices

Cons

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets suffer 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
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic mount.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these devices are able to complicate diagnosis medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting force for a neodymium magnet – what contributes to it?

The load parameter shown concerns the maximum value, measured under ideal test conditions, meaning:
  • on a base made of structural steel, optimally conducting the magnetic field
  • with a cross-section no less than 10 mm
  • with an ideally smooth contact surface
  • without the slightest clearance between the magnet and steel
  • during pulling in a direction perpendicular to the plane
  • at temperature room level

What influences lifting capacity in practice

During everyday use, the actual holding force depends on a number of factors, ranked from most significant:
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material composition – different alloys attracts identically. High carbon content worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under shearing force the holding force is lower. Moreover, even a small distance between the magnet and the plate reduces the holding force.

Warnings
Handling rules

Handle magnets with awareness. Their powerful strength can surprise even experienced users. Be vigilant and do not underestimate their power.

Hand protection

Big blocks can break fingers instantly. Under no circumstances put your hand between two attracting surfaces.

Do not give to children

Strictly store magnets away from children. Choking hazard is high, and the consequences of magnets clamping inside the body are life-threatening.

Shattering risk

NdFeB magnets are ceramic materials, which means they are very brittle. Clashing of two magnets will cause them shattering into shards.

Allergic reactions

Nickel alert: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, cease handling magnets and use protective gear.

GPS and phone interference

A powerful magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Do not bring magnets close to a smartphone to prevent damaging the sensors.

Danger to pacemakers

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Mechanical processing

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

Data carriers

Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can permanently damage these devices and wipe information from cards.

Heat sensitivity

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Safety First! Looking for details? Check our post: Are neodymium magnets dangerous?