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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

see specifications »

4.54 ZŁ with VAT / pcs + price for transport

3.69 ZŁ net + 23% VAT / pcs

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Technical parameters - 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

Physical simulation of the magnet - data

The following information represent the result of a physical simulation. Values are based on models for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Treat these calculations as a reference point during assembly planning.

Table 1: Static force (pull vs distance) - characteristics
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 pounds
6150.0 g / 60.3 N
 warning
1 mm 3035 Gs
303.5 mT
 4.64 kg / 10.23 pounds
4641.8 g / 45.5 N
 warning
2 mm 2558 Gs
255.8 mT
 3.30 kg / 7.27 pounds
3298.0 g / 32.4 N
 warning
3 mm 2120 Gs
212.0 mT
 2.26 kg / 4.99 pounds
2264.8 g / 22.2 N
 warning
5 mm 1433 Gs
143.3 mT
 1.03 kg / 2.28 pounds
1034.5 g / 10.1 N
 low risk
10 mm 574 Gs
57.4 mT
 0.17 kg / 0.37 pounds
166.1 g / 1.6 N
 low risk
15 mm 267 Gs
26.7 mT
 0.04 kg / 0.08 pounds
35.9 g / 0.4 N
 low risk
20 mm 141 Gs
14.1 mT
 0.01 kg / 0.02 pounds
10.1 g / 0.1 N
 low risk
30 mm 52 Gs
5.2 mT
 0.00 kg / 0.00 pounds
1.4 g / 0.0 N
 low risk
50 mm 13 Gs
1.3 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 low risk
Pulling power weakens sharply per each millimeter of distance. Remember that even a very thin break (e.g., contamination, varnish, dust) noticeably diminishes the holding power. Neodymiums operate most effectively at the point of direct contact; distance drastically cuts the power. Notice how rapidly the pull force fall, when the magnet does not touch tightly to the steel surface. When planning the mounting, discard additional spacers.

Table 2: Vertical force (wall)
MPL 20x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.23 kg / 2.71 pounds
1230.0 g / 12.1 N
1 mm Stal (~0.2) 0.93 kg / 2.05 pounds
928.0 g / 9.1 N
2 mm Stal (~0.2) 0.66 kg / 1.46 pounds
660.0 g / 6.5 N
3 mm Stal (~0.2) 0.45 kg / 1.00 pounds
452.0 g / 4.4 N
5 mm Stal (~0.2) 0.21 kg / 0.45 pounds
206.0 g / 2.0 N
10 mm Stal (~0.2) 0.03 kg / 0.07 pounds
34.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below indicates the theoretical weight limit required to start the slippage of the magnet downwards against a vertical metal surface (considering standard friction coefficient). This value varies with the separation distance between the magnet and the metal.

Table 3: Vertical assembly (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 pounds
1845.0 g / 18.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.23 kg / 2.71 pounds
1230.0 g / 12.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.62 kg / 1.36 pounds
615.0 g / 6.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.08 kg / 6.78 pounds
3075.0 g / 30.2 N
When placing a magnet on a upright wall (e.g., a car body), it you can count on just approx. 1/5 of its nominal power. Gravity as well as a weak degree of grip mean that products slip faster than they pull off. Want to create a hanger? Consider that the shear force is much weaker than the maximum static pull force. On a painted metal, the element will slide down under a significantly smaller weight. Using a rubber pad can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MPL 20x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.62 kg / 1.36 pounds
615.0 g / 6.0 N
1 mm
25%
 1.54 kg / 3.39 pounds
1537.5 g / 15.1 N
2 mm
50%
 3.08 kg / 6.78 pounds
3075.0 g / 30.2 N
3 mm
75%
 4.61 kg / 10.17 pounds
4612.5 g / 45.2 N
5 mm
100%
 6.15 kg / 13.56 pounds
6150.0 g / 60.3 N
10 mm
100%
 6.15 kg / 13.56 pounds
6150.0 g / 60.3 N
11 mm
100%
 6.15 kg / 13.56 pounds
6150.0 g / 60.3 N
12 mm
100%
 6.15 kg / 13.56 pounds
6150.0 g / 60.3 N
A thin sheet cannot absorb the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's power, you need a suitably thick element of steel. The saturation phenomenon causes that on sheet metal structures (e.g., car bodies), the holder works worse. We advise picking the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - 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 pounds
6150.0 g / 60.3 N
 OK
40 °C -2.2% 6.01 kg / 13.26 pounds
6014.7 g / 59.0 N
 OK
60 °C -4.4% 5.88 kg / 12.96 pounds
5879.4 g / 57.7 N
80 °C -6.6% 5.74 kg / 12.66 pounds
5744.1 g / 56.3 N
100 °C -28.8% 4.38 kg / 9.65 pounds
4378.8 g / 43.0 N
Ordinary NdFeB products change their properties power after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly damage this product. With every degree above norm, the neodymium's capacity briefly lowers. Avoid using this product in hot environments higher than its safe range. Ignoring the limit will result in permanent loss of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 20x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 15.04 kg / 33.17 pounds
4 923 Gs
2.26 kg / 4.98 pounds
2257 g / 22.1 N
 N/A
1 mm 13.20 kg / 29.11 pounds
6 544 Gs
1.98 kg / 4.37 pounds
1980 g / 19.4 N
 11.88 kg / 26.19 pounds
~0 Gs
2 mm 11.36 kg / 25.03 pounds
6 069 Gs
1.70 kg / 3.76 pounds
1703 g / 16.7 N
 10.22 kg / 22.53 pounds
~0 Gs
3 mm 9.63 kg / 21.22 pounds
5 588 Gs
1.44 kg / 3.18 pounds
1444 g / 14.2 N
 8.66 kg / 19.10 pounds
~0 Gs
5 mm 6.71 kg / 14.78 pounds
4 664 Gs
1.01 kg / 2.22 pounds
1006 g / 9.9 N
 6.03 kg / 13.30 pounds
~0 Gs
10 mm 2.53 kg / 5.58 pounds
2 865 Gs
0.38 kg / 0.84 pounds
380 g / 3.7 N
 2.28 kg / 5.02 pounds
~0 Gs
20 mm 0.41 kg / 0.90 pounds
1 148 Gs
0.06 kg / 0.13 pounds
61 g / 0.6 N
 0.37 kg / 0.81 pounds
~0 Gs
50 mm 0.01 kg / 0.02 pounds
165 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.01 pounds
104 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
69 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
48 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
35 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
26 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a much further distance than a magnet and steel setup. Such a system of magnet-to-magnet creates a more powerful interaction and a wider radius of performance. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Remember that when bringing together two magnets, the collision energy is massive. The levitation is marginally weaker than the connection force, but still impressive.
*Field value for N-N configuration reaches ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Attention: Results show sliding force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - precautionary measures
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
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Car key 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
A strong magnetic field is a real danger to IT equipment as well as medical implants. These magnets produce a flux that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field acts through matter and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
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
Neodymium magnets are very brittle – a collision with steel can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Impact energy can destroy the magnet or injury to fingers. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when working with large magnets.

Table 9: Surface protection spec
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MPL 20x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 031 Mx 70.3 µWb
Pc Coefficient 0.42 Low (Flat)
Total magnetic flux emitted by the magnet pole. Key data when building generators as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
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: 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds only ~20% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Power loss vs temp

*For standard magnets, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.42

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.

Engineering data and GPSR
Material specification
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: 020128-2026
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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 20x10x5 mm and a weight of 7.5 g, guarantees the highest quality connection. This rectangular block with a force of 60.31 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 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.
Plate magnets MPL 20x10x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 20x10x5 / 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. 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. The key parameter here is the lifting capacity amounting to approximately 6.15 kg (force ~60.31 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of neodymium magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their magnetic field is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
  • They have excellent resistance to magnetism drop as a result of opposing magnetic fields,
  • In other words, due to the shiny surface of silver, the element gains visual value,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in shaping and the ability to adapt to individual projects,
  • Huge importance in future technologies – they are utilized in data components, motor assemblies, advanced medical instruments, also technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • 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 nuts in the magnet and complex forms - preferred is casing - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these products can complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum holding power of the magnet – what affects it?

The lifting capacity listed is a measurement result executed under specific, ideal conditions:
  • using a base made of mild steel, functioning as a ideal flux conductor
  • with a thickness minimum 10 mm
  • with an ground contact surface
  • under conditions of no distance (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • at temperature room level

Determinants of lifting force in real conditions

During everyday use, the actual holding force results from many variables, presented from most significant:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Plate thickness – too thin steel does not close the flux, causing part of the flux to be lost to the other side.
  • Metal type – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate decreases the holding force.

Warnings
Powerful field

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Electronic devices

Intense magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Warning for allergy sufferers

Certain individuals suffer from a sensitization to Ni, which is the standard coating for neodymium magnets. Prolonged contact might lead to skin redness. We recommend wear safety gloves.

Keep away from children

NdFeB magnets are not intended for children. Swallowing multiple magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates immediate surgery.

Precision electronics

An intense magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Do not bring magnets near a smartphone to avoid damaging the sensors.

Physical harm

Pinching hazard: The pulling power is so great that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Machining danger

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Implant safety

Patients with a heart stimulator must keep an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.

Material brittleness

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Power loss in heat

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Warning! Learn more about risks in the article: Magnet Safety Guide.