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MPL 20x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020128

GTIN/EAN: 5906301811343

5.00

length

20 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

7.5 g

Magnetization Direction

↑ axial

Load capacity

6.15 kg / 60.31 N

Magnetic Induction

349.47 mT / 3495 Gs

Coating

[NiCuNi] Nickel

4.54 with VAT / pcs + price for transport

3.69 ZŁ net + 23% VAT / pcs

bulk discounts:

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Lifting power along with form of a neodymium magnet can be reviewed using our magnetic mass calculator.

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Technical of the product - MPL 20x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 20x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020128
GTIN/EAN 5906301811343
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 20 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 7.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.15 kg / 60.31 N
Magnetic Induction ~ ? 349.47 mT / 3495 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x10x5 / 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 magnet - report

These information constitute the direct effect of a mathematical calculation. Values were calculated on algorithms for the class Nd2Fe14B. Operational performance may differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - power drop
MPL 20x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3493 Gs
349.3 mT
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
warning
1 mm 3035 Gs
303.5 mT
4.64 kg / 10.23 lbs
4641.8 g / 45.5 N
warning
2 mm 2558 Gs
255.8 mT
3.30 kg / 7.27 lbs
3298.0 g / 32.4 N
warning
3 mm 2120 Gs
212.0 mT
2.26 kg / 4.99 lbs
2264.8 g / 22.2 N
warning
5 mm 1433 Gs
143.3 mT
1.03 kg / 2.28 lbs
1034.5 g / 10.1 N
low risk
10 mm 574 Gs
57.4 mT
0.17 kg / 0.37 lbs
166.1 g / 1.6 N
low risk
15 mm 267 Gs
26.7 mT
0.04 kg / 0.08 lbs
35.9 g / 0.4 N
low risk
20 mm 141 Gs
14.1 mT
0.01 kg / 0.02 lbs
10.1 g / 0.1 N
low risk
30 mm 52 Gs
5.2 mT
0.00 kg / 0.00 lbs
1.4 g / 0.0 N
low risk
50 mm 13 Gs
1.3 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
low risk

Table 2: Sliding hold (vertical surface)
MPL 20x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.23 kg / 2.71 lbs
1230.0 g / 12.1 N
1 mm Stal (~0.2) 0.93 kg / 2.05 lbs
928.0 g / 9.1 N
2 mm Stal (~0.2) 0.66 kg / 1.46 lbs
660.0 g / 6.5 N
3 mm Stal (~0.2) 0.45 kg / 1.00 lbs
452.0 g / 4.4 N
5 mm Stal (~0.2) 0.21 kg / 0.45 lbs
206.0 g / 2.0 N
10 mm Stal (~0.2) 0.03 kg / 0.07 lbs
34.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MPL 20x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.85 kg / 4.07 lbs
1845.0 g / 18.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.23 kg / 2.71 lbs
1230.0 g / 12.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.62 kg / 1.36 lbs
615.0 g / 6.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.08 kg / 6.78 lbs
3075.0 g / 30.2 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 20x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.62 kg / 1.36 lbs
615.0 g / 6.0 N
1 mm
25%
1.54 kg / 3.39 lbs
1537.5 g / 15.1 N
2 mm
50%
3.08 kg / 6.78 lbs
3075.0 g / 30.2 N
3 mm
75%
4.61 kg / 10.17 lbs
4612.5 g / 45.2 N
5 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
10 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
11 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
12 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N

Table 5: Working in heat (material behavior) - resistance threshold
MPL 20x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
OK
40 °C -2.2% 6.01 kg / 13.26 lbs
6014.7 g / 59.0 N
OK
60 °C -4.4% 5.88 kg / 12.96 lbs
5879.4 g / 57.7 N
80 °C -6.6% 5.74 kg / 12.66 lbs
5744.1 g / 56.3 N
100 °C -28.8% 4.38 kg / 9.65 lbs
4378.8 g / 43.0 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 20x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 15.04 kg / 33.17 lbs
4 923 Gs
2.26 kg / 4.98 lbs
2257 g / 22.1 N
N/A
1 mm 13.20 kg / 29.11 lbs
6 544 Gs
1.98 kg / 4.37 lbs
1980 g / 19.4 N
11.88 kg / 26.19 lbs
~0 Gs
2 mm 11.36 kg / 25.03 lbs
6 069 Gs
1.70 kg / 3.76 lbs
1703 g / 16.7 N
10.22 kg / 22.53 lbs
~0 Gs
3 mm 9.63 kg / 21.22 lbs
5 588 Gs
1.44 kg / 3.18 lbs
1444 g / 14.2 N
8.66 kg / 19.10 lbs
~0 Gs
5 mm 6.71 kg / 14.78 lbs
4 664 Gs
1.01 kg / 2.22 lbs
1006 g / 9.9 N
6.03 kg / 13.30 lbs
~0 Gs
10 mm 2.53 kg / 5.58 lbs
2 865 Gs
0.38 kg / 0.84 lbs
380 g / 3.7 N
2.28 kg / 5.02 lbs
~0 Gs
20 mm 0.41 kg / 0.90 lbs
1 148 Gs
0.06 kg / 0.13 lbs
61 g / 0.6 N
0.37 kg / 0.81 lbs
~0 Gs
50 mm 0.01 kg / 0.02 lbs
165 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
104 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
69 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
48 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
35 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
26 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Hazards (implants) - warnings
MPL 20x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.5 cm
Hearing aid 10 Gs (1.0 mT) 6.0 cm
Timepiece 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - collision effects
MPL 20x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.36 km/h
(8.16 m/s)
0.25 J
30 mm 50.03 km/h
(13.90 m/s)
0.72 J
50 mm 64.58 km/h
(17.94 m/s)
1.21 J
100 mm 91.32 km/h
(25.37 m/s)
2.41 J

Table 9: Coating parameters (durability)
MPL 20x10x5 / 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 (Pc)
MPL 20x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 031 Mx 70.3 µWb
Pc Coefficient 0.42 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 20x10x5 / N38

Environment Effective steel pull Effect
Air (land) 6.15 kg Standard
Water (riverbed) 7.04 kg
(+0.89 kg buoyancy gain)
+14.5%
Rust risk: 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

*Caution: On a vertical wall, the magnet retains merely ~20% of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely reduces 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) = 0.42

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: 020128-2026
Magnet Unit Converter
Pulling force

Magnetic Field

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Component MPL 20x10x5 / 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. 6.15 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. Watch your fingers! Magnets with a force of 6.15 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.
They constitute a key element in the production of generators and material handling systems. Thanks to the flat surface and high force (approx. 6.15 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 20x10x5 / N38, we recommend utilizing two-component adhesives (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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
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 (20x10 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 20x10x5 mm, which, at a weight of 7.5 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 20x10x5 mm and a self-weight of 7.5 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of rare earth magnets.

Pros

Apart from their strong magnetic energy, neodymium magnets have these key benefits:
  • Their power is maintained, and after around 10 years it drops only by ~1% (theoretically),
  • Magnets perfectly resist against demagnetization caused by foreign field sources,
  • Thanks to the smooth finish, the plating of Ni-Cu-Ni, gold, or silver gives an modern appearance,
  • Magnetic induction on the working layer of the magnet is strong,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to the possibility of free molding and adaptation to individualized needs, neodymium magnets can be created in a wide range of forms and dimensions, which makes them more universal,
  • Significant place in innovative solutions – they are utilized in mass storage devices, motor assemblies, advanced medical instruments, also industrial machines.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense 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 experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. To use them in conditions 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 creating threads and complex shapes in magnets, we recommend using casing - magnetic holder.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these products can be problematic in diagnostics 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

Magnetic strength at its maximum – what contributes to it?

The force parameter is a result of laboratory testing conducted under standard conditions:
  • with the use of a yoke made of special test steel, guaranteeing maximum field concentration
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular force vector (90-degree angle)
  • at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

In practice, the actual holding force depends on a number of factors, listed from the most important:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Plate material – low-carbon steel attracts best. Alloy steels lower magnetic permeability and holding force.
  • Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Power loss in heat

Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Conscious usage

Handle with care. Neodymium magnets act from a long distance and connect with massive power, often faster than you can move away.

Fragile material

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Impact on smartphones

GPS units and smartphones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Medical interference

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

Magnetic media

Data protection: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Pinching danger

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

Fire risk

Fire hazard: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

Swallowing risk

Product intended for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Store out of reach of children and animals.

Skin irritation risks

It is widely known that nickel (the usual finish) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands or select coated magnets.

Attention! Learn more about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98