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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

check properties »

15.62 ZŁ with VAT / pcs + price for transport

12.70 ZŁ net + 23% VAT / pcs

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Parameters along with shape of a neodymium magnet can be verified using our magnetic mass calculator.

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Product card - 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 - technical parameters

These data constitute the result of a physical simulation. Values rely on models for the material Nd2Fe14B. Operational parameters may deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (force 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 lbs
11060.0 g / 108.5 N
 crushing
1 mm 1938 Gs
193.8 mT
 10.05 kg / 22.15 lbs
10049.3 g / 98.6 N
 crushing
2 mm 1823 Gs
182.3 mT
 8.89 kg / 19.60 lbs
8888.2 g / 87.2 N
 medium risk
3 mm 1696 Gs
169.6 mT
 7.69 kg / 16.96 lbs
7691.7 g / 75.5 N
 medium risk
5 mm 1433 Gs
143.3 mT
 5.49 kg / 12.10 lbs
5490.3 g / 53.9 N
 medium risk
10 mm 885 Gs
88.5 mT
 2.09 kg / 4.62 lbs
2093.5 g / 20.5 N
 medium risk
15 mm 547 Gs
54.7 mT
 0.80 kg / 1.76 lbs
799.6 g / 7.8 N
 low risk
20 mm 350 Gs
35.0 mT
 0.33 kg / 0.72 lbs
327.0 g / 3.2 N
 low risk
30 mm 160 Gs
16.0 mT
 0.07 kg / 0.15 lbs
68.5 g / 0.7 N
 low risk
50 mm 48 Gs
4.8 mT
 0.01 kg / 0.01 lbs
6.2 g / 0.1 N
 low risk
Grip strength weakens drastically with every subsequent millimeter of gap. Note that even a very thin break (e.g., dirt, varnish, rust) noticeably diminishes the holding power. Neodymiums hold strongest at the point of direct contact; distance kills the force. Observe how rapidly the load capacity drop, when the magnet does not touch flatly to the steel surface. When calculating the arrangement, avoid additional spacers.

Table 2: Sliding hold (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
The following data indicates the estimated holding capacity needed to cause the slippage of the magnet down on a vertical metal surface (considering typical friction). This value 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 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 mounting a magnet on a upright wall (e.g., a car body), it you can count on only approx. 1/5 of nominal attraction strength. Gravity and a low friction coefficient influence the fact that products slide down faster than they pull off. Planning a vertical fastening? Remember that the shear force is significantly lower than the maximum static pull force. On a painted metal, the holder will give way down under a noticeably lighter cargo. Using a rubber layer can significantly raise the stability.

Table 4: Steel thickness (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 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 unable to take in the entire magnetic field, which wastes potential of the holder. Should you install a neodymium to a thin surface, the flux will penetrate right through and the holding will be smaller. To utilize full efficiency of this magnet's potential, you need a suitably thick backing of steel. The saturation phenomenon means that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We suggest choosing the steel thickness according to the table below.

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 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 lose power past the thermal threshold. Watch out for overheating – heat can permanently demagnetize this magnet. With every degree above norm, the neodymium's power momentarily drops. Do not use this product close to ovens higher than its operating temperature limit. Ignoring the limit will lead to destruction of magnetism.
*Technical advisory: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) risk losing magnetic properties at lower temperatures than taller cylinders. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
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 strong neodymiums interact from a significantly greater distance than a neodymium and metal combination. The connection of two magnets creates a more powerful interaction and a further horizon of action. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the impact force is huge. The levitation is marginally weaker than the attraction, but still large.
*Field value between like poles is approximately ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Note: Calculations demonstrate shear force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - 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
A strong magnetic field is a serious hazard to electronic devices as well as pacemakers. These NdFeB products produce a flux that disrupts operation of digital equipment. Be aware: the invisible magnetic field penetrates the body and glass. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
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
Magnetic elements are delicate – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or painful pinches to skin. Always hold the magnet during bringing near metal so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when playing with powerful specimens.

Table 9: Anti-corrosion coating 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

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 passing through the pole surface. Key data for generator designers and motors. Pc value determines 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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

*Caution: On a vertical wall, the magnet holds merely approx. 20-30% of its max power.

2. Plate thickness effect

*Thin steel (e.g. computer case) severely weakens the holding force.

3. Thermal stability

*For N38 grade, the safety limit 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%
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
Magnet Unit Converter
Force (pull)
Magnetic Induction
Enter your figure in one of the inputs, and the remaining fields change on the fly.

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This product is an extremely strong 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 the highest quality connection. This rectangular block with a force of 108.46 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.
Separating strong flat 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 wind generators and material handling systems. Thanks to the flat surface and high force (approx. 11.06 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 42x20x5 / N38 model is magnetized axially (dimension 5 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 (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. 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 product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of neodymium magnets.

Pros

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • By covering with a reflective layer of nickel, the element presents an proper look,
  • Magnetic induction on the working part of the magnet turns out to be strong,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • In view of the option of accurate molding and customization to specialized needs, magnetic components can be manufactured in a variety of geometric configurations, which expands the range of possible applications,
  • Significant place in innovative solutions – they are utilized in data components, brushless drives, medical devices, also industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises 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 oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic mechanism.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, small elements of these devices are able to complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Magnetic strength at its maximum – what affects it?

Holding force of 11.06 kg is a measurement result conducted under the following configuration:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • with a cross-section no less than 10 mm
  • with a plane free of scratches
  • under conditions of no distance (metal-to-metal)
  • under perpendicular force direction (90-degree angle)
  • in neutral thermal conditions

Key elements affecting lifting force

Real force is influenced by working environment parameters, such as (from priority):
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Angle of force application – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
  • Surface finish – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured with the use of a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
GPS Danger

A strong magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Keep magnets close to a smartphone to prevent damaging the sensors.

Protect data

Do not bring magnets near a wallet, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Medical implants

Warning for patients: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Safe operation

Use magnets with awareness. Their huge power can surprise even professionals. Plan your moves and respect their force.

Thermal limits

Regular neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Finger safety

Risk of injury: The pulling power is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Magnet fragility

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Nickel coating and allergies

It is widely known that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, prevent direct skin contact and opt for encased magnets.

Flammability

Powder generated during cutting of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Adults only

Neodymium magnets are not toys. Eating a few magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and necessitates immediate surgery.

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