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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

bulk discounts:

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Technical data - 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 simulation of the magnet - data

These data represent the result of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static 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
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

Table 2: Shear load (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: 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

Table 4: Material efficiency (saturation) - 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 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: Working in heat (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

Table 6: Magnet-Magnet interaction (attraction) - field range
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

Table 7: Safety (HSE) (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
Timepiece 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: Dynamics (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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) drastically 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.

Engineering data and GPSR
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%
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: 020163-2026
Quick Unit Converter
Force (pull)

Magnetic Induction

Other products

Component MPL 42x20x5 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. 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.
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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 42x20x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 42x20x5 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. 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 holding force amounting to approximately 11.06 kg (force ~108.46 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of Nd2Fe14B magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • Magnets very well defend themselves against loss of magnetization caused by ambient magnetic noise,
  • In other words, due to the shiny finish of gold, the element becomes visually attractive,
  • Neodymium magnets create maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
  • Thanks to modularity in shaping and the ability to customize to individual projects,
  • Significant place in advanced technology sectors – they are commonly used in HDD drives, electric motors, diagnostic systems, and multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Cons of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited possibility of producing threads in the magnet and complex shapes - preferred is cover - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnetwhat affects it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:
  • using a base made of mild steel, functioning as a magnetic yoke
  • with a cross-section minimum 10 mm
  • characterized by smoothness
  • with zero gap (no impurities)
  • during pulling in a direction vertical to the mounting surface
  • at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

Real force is affected by working environment parameters, such as (from most important):
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Material composition – different alloys reacts the same. Alloy additives weaken the attraction effect.
  • Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets
Power loss in heat

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Magnet fragility

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Allergic reactions

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease handling magnets and use protective gear.

Machining danger

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Do not give to children

Only for adults. Tiny parts can be swallowed, causing severe trauma. Keep away from children and animals.

Impact on smartphones

An intense magnetic field disrupts the operation of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.

Protect data

Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Life threat

Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Powerful field

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

Finger safety

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

Safety First! More info about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98