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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

technical details »

4.54 ZŁ with VAT / pcs + price for transport

3.69 ZŁ net + 23% VAT / pcs

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Product card - 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 assembly - report

Presented values constitute the direct effect of a engineering analysis. Results are based on algorithms for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs distance) - 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
 strong
1 mm 3035 Gs
303.5 mT
 4.64 kg / 10.23 lbs
4641.8 g / 45.5 N
 strong
2 mm 2558 Gs
255.8 mT
 3.30 kg / 7.27 lbs
3298.0 g / 32.4 N
 strong
3 mm 2120 Gs
212.0 mT
 2.26 kg / 4.99 lbs
2264.8 g / 22.2 N
 strong
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
Pulling power drops drastically per each millimeter of spacing. Keep in mind that even a very thin break (e.g., contamination, varnish, veneer) significantly diminishes the holding power. Magnetic products work optimally at the point of direct contact; gap drastically cuts the force. Analyze how flashily the pull force fall, when the magnet does not touch directly to the steel surface. When designing the mounting, eliminate additional spacers.

Table 2: Slippage capacity (wall)
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
The table below indicates the theoretical weight limit necessary to cause the sliding of the magnet vertically against a upright steel wall (considering typical friction). This value is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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
When placing a holder on a upright plane (e.g., a fridge), it you can count on just about 1/5 of its nominal power. Gravity as well as a low friction coefficient cause that magnets move down easier than they detach. Want to create a vertical fastening? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will slide down under a noticeably lighter weight. Using a rubber pad can effectively increase the grip.

Table 4: Steel thickness (saturation) - 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 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
A too thin steel is unable to conduct the full magnetic flux, which weakens actual performance of the magnet. Should you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To achieve 100% of this neodymium's potential, you require a sufficiently solid piece of metal. The saturation effect means that on delicate walls (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Working in heat (material behavior) - power drop
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
Classic neodymiums lose power above the temperature limit. Avoid high temperatures – excessive heat can irreversibly destroy this product. With increasing heat, the magnet's capacity temporarily drops. Do not use this product near heat sources higher than its operating temperature limit. Ignoring the limit will cause permanent loss of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (low Pc) may lose charge permanently under lower heat stress than taller cylinders. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field range
MPL 20x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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
Two strong neodymiums interact from a significantly greater distance than a neodymium and metal setup. Such a system of magnet-to-magnet generates a stronger field and a wider radius of action. Want to build a strong closure? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is huge. The repulsion force is a bit weaker than the attraction, but still large.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
* Results refer to sliding force of dual same magnets (friction coefficient ~0.15 for Ni-Ni coating).

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
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
A strong magnetic field is a real danger to IT equipment and pacemakers. These NdFeB products generate a field that destroys function of sensitive medical devices. Be aware: the unseen radiation passes through tissues and glass. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - 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
Magnetic elements are delicate – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when handling with large magnets.

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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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)
Flux value emitted by the pole surface. Key data in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains only approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly reduces the holding force.

3. Power loss vs temp

*For standard magnets, 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

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: 020128-2026
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This product is an extremely strong plate magnet 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. Additionally, 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. To separate the MPL 20x10x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. 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. 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, it is best to use strong epoxy glues (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. 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. 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.
The presented product is a neodymium magnet with precisely defined parameters: 20 mm (length), 10 mm (width), and 5 mm (thickness). 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 protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of neodymium magnets.

Pros

Apart from their strong power, neodymium magnets have these key benefits:
  • They have stable power, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
  • Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by external interference,
  • In other words, due to the glossy layer of gold, the element becomes visually attractive,
  • Magnetic induction on the surface of the magnet is impressive,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of exact creating and adapting to defined conditions,
  • Universal use in innovative solutions – they are utilized in data components, electromotive mechanisms, advanced medical instruments, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We recommend cover - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these devices can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditions – what contributes to it?

The specified lifting capacity refers to the maximum value, recorded under ideal test conditions, specifically:
  • on a block made of mild steel, effectively closing the magnetic flux
  • whose thickness is min. 10 mm
  • characterized by lack of roughness
  • without any air gap between the magnet and steel
  • under vertical force vector (90-degree angle)
  • at room temperature

Determinants of practical lifting force of a magnet

During everyday use, the real power depends on a number of factors, presented from the most important:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material composition – different alloys reacts the same. Alloy additives weaken the attraction effect.
  • Surface finish – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate decreases the load capacity.

H&S for magnets
Bodily injuries

Watch your fingers. Two powerful magnets will join immediately with a force of massive weight, crushing everything in their path. Be careful!

Protect data

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

Risk of cracking

Neodymium magnets are ceramic materials, which means they are prone to chipping. Clashing of two magnets leads to them cracking into shards.

Swallowing risk

Product intended for adults. Tiny parts can be swallowed, causing intestinal necrosis. Store away from children and animals.

ICD Warning

People with a heart stimulator must keep an large gap from magnets. The magnetism can stop the functioning of the life-saving device.

Keep away from electronics

An intense magnetic field disrupts the functioning of compasses in smartphones and navigation systems. Keep magnets close to a device to prevent damaging the sensors.

Flammability

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Power loss in heat

Watch the temperature. Heating the magnet to high heat will destroy its properties and pulling force.

Allergic reactions

A percentage of the population experience a contact allergy to Ni, which is the common plating for neodymium magnets. Extended handling may cause dermatitis. It is best to wear protective gloves.

Conscious usage

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

Danger! Need more info? Read our article: Why are neodymium magnets dangerous?