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MPL 20x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020129

GTIN/EAN: 5906301811350

5.00

length

20 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

60 g

Magnetization Direction

↑ axial

Load capacity

15.40 kg / 151.12 N

Magnetic Induction

540.22 mT / 5402 Gs

Coating

[NiCuNi] Nickel

technical details »

33.21 ZŁ with VAT / pcs + price for transport

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Technical parameters - MPL 20x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 20x20x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020129
GTIN/EAN 5906301811350
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 20 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 60 g
Magnetization Direction ↑ axial
Load capacity ~ ? 15.40 kg / 151.12 N
Magnetic Induction ~ ? 540.22 mT / 5402 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x20x20 / 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 analysis of the magnet - report

Presented values are the result of a physical simulation. Results were calculated on models for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - power drop
MPL 20x20x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5400 Gs
540.0 mT
 15.40 kg / 33.95 LBS
15400.0 g / 151.1 N
 crushing
1 mm 4910 Gs
491.0 mT
 12.73 kg / 28.07 LBS
12732.2 g / 124.9 N
 crushing
2 mm 4423 Gs
442.3 mT
 10.33 kg / 22.77 LBS
10328.3 g / 101.3 N
 crushing
3 mm 3955 Gs
395.5 mT
 8.26 kg / 18.21 LBS
8258.3 g / 81.0 N
 strong
5 mm 3114 Gs
311.4 mT
 5.12 kg / 11.29 LBS
5120.3 g / 50.2 N
 strong
10 mm 1671 Gs
167.1 mT
 1.48 kg / 3.25 LBS
1475.0 g / 14.5 N
 weak grip
15 mm 936 Gs
93.6 mT
 0.46 kg / 1.02 LBS
463.0 g / 4.5 N
 weak grip
20 mm 562 Gs
56.2 mT
 0.17 kg / 0.37 LBS
167.1 g / 1.6 N
 weak grip
30 mm 244 Gs
24.4 mT
 0.03 kg / 0.07 LBS
31.3 g / 0.3 N
 weak grip
50 mm 73 Gs
7.3 mT
 0.00 kg / 0.01 LBS
2.8 g / 0.0 N
 weak grip
Pulling power drops drastically per each millimeter of spacing. Remember that even a very thin break (e.g., dirt, varnish, dust) noticeably weakens the grip. Neodymiums hold strongest at the point of direct contact; air break nullifies the power. See how quickly the load capacity plummet, when the magnet does not adhere flatly to the metal substrate. When calculating the arrangement, avoid additional spacers.

Table 2: Vertical hold (vertical surface)
MPL 20x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.08 kg / 6.79 LBS
3080.0 g / 30.2 N
1 mm Stal (~0.2) 2.55 kg / 5.61 LBS
2546.0 g / 25.0 N
2 mm Stal (~0.2) 2.07 kg / 4.55 LBS
2066.0 g / 20.3 N
3 mm Stal (~0.2) 1.65 kg / 3.64 LBS
1652.0 g / 16.2 N
5 mm Stal (~0.2) 1.02 kg / 2.26 LBS
1024.0 g / 10.0 N
10 mm Stal (~0.2) 0.30 kg / 0.65 LBS
296.0 g / 2.9 N
15 mm Stal (~0.2) 0.09 kg / 0.20 LBS
92.0 g / 0.9 N
20 mm Stal (~0.2) 0.03 kg / 0.07 LBS
34.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below shows the theoretical force sufficient to cause the downward movement of the magnet vertically against a upright steel wall (assuming standard friction). This parameter is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 20x20x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.62 kg / 10.19 LBS
4620.0 g / 45.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.08 kg / 6.79 LBS
3080.0 g / 30.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.54 kg / 3.40 LBS
1540.0 g / 15.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.70 kg / 16.98 LBS
7700.0 g / 75.5 N
When hanging a holder on a upright plane (e.g., a car body), it will maintain barely about 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip cause that magnets slide down easier than they pull off. Designing a hanger? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a significantly smaller weight. Utilizing a rubberized pad can significantly raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MPL 20x20x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.77 kg / 1.70 LBS
770.0 g / 7.6 N
1 mm
13%
 1.93 kg / 4.24 LBS
1925.0 g / 18.9 N
2 mm
25%
 3.85 kg / 8.49 LBS
3850.0 g / 37.8 N
3 mm
38%
 5.78 kg / 12.73 LBS
5775.0 g / 56.7 N
5 mm
63%
 9.63 kg / 21.22 LBS
9625.0 g / 94.4 N
10 mm
100%
 15.40 kg / 33.95 LBS
15400.0 g / 151.1 N
11 mm
100%
 15.40 kg / 33.95 LBS
15400.0 g / 151.1 N
12 mm
100%
 15.40 kg / 33.95 LBS
15400.0 g / 151.1 N
A too thin steel cannot conduct the full magnetic flux, which wastes potential of the holder. Should you mount a strong magnet to a weak sheet, the flux will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you need a suitably thick element of steel. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the magnet works worse. We advise picking the steel cross-section according to the table below.

Table 5: Thermal resistance (material behavior) - power drop
MPL 20x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 15.40 kg / 33.95 LBS
15400.0 g / 151.1 N
 OK
40 °C -2.2% 15.06 kg / 33.20 LBS
15061.2 g / 147.8 N
 OK
60 °C -4.4% 14.72 kg / 32.46 LBS
14722.4 g / 144.4 N
 OK
80 °C -6.6% 14.38 kg / 31.71 LBS
14383.6 g / 141.1 N
100 °C -28.8% 10.96 kg / 24.17 LBS
10964.8 g / 107.6 N
Classic neodymiums change their properties power after exceeding the maximum temperature. Avoid high temperatures – high temperature can irreversibly damage this product. As the temperature rises, the magnet's force temporarily drops. Avoid using this product close to ovens exceeding its operating temperature limit. Too high temperature will cause permanent loss of magnetic properties.
*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) are more susceptible to demagnetization sooner than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 20x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 71.92 kg / 158.55 LBS
5 962 Gs
10.79 kg / 23.78 LBS
10787 g / 105.8 N
 N/A
1 mm 65.60 kg / 144.63 LBS
10 316 Gs
9.84 kg / 21.69 LBS
9840 g / 96.5 N
 59.04 kg / 130.16 LBS
~0 Gs
2 mm 59.46 kg / 131.08 LBS
9 821 Gs
8.92 kg / 19.66 LBS
8919 g / 87.5 N
 53.51 kg / 117.97 LBS
~0 Gs
3 mm 53.66 kg / 118.30 LBS
9 329 Gs
8.05 kg / 17.74 LBS
8049 g / 79.0 N
 48.29 kg / 106.47 LBS
~0 Gs
5 mm 43.20 kg / 95.24 LBS
8 371 Gs
6.48 kg / 14.29 LBS
6480 g / 63.6 N
 38.88 kg / 85.71 LBS
~0 Gs
10 mm 23.91 kg / 52.72 LBS
6 228 Gs
3.59 kg / 7.91 LBS
3587 g / 35.2 N
 21.52 kg / 47.44 LBS
~0 Gs
20 mm 6.89 kg / 15.19 LBS
3 343 Gs
1.03 kg / 2.28 LBS
1033 g / 10.1 N
 6.20 kg / 13.67 LBS
~0 Gs
50 mm 0.32 kg / 0.71 LBS
721 Gs
0.05 kg / 0.11 LBS
48 g / 0.5 N
 0.29 kg / 0.64 LBS
~0 Gs
60 mm 0.15 kg / 0.32 LBS
487 Gs
0.02 kg / 0.05 LBS
22 g / 0.2 N
 0.13 kg / 0.29 LBS
~0 Gs
70 mm 0.07 kg / 0.16 LBS
344 Gs
0.01 kg / 0.02 LBS
11 g / 0.1 N
 0.07 kg / 0.14 LBS
~0 Gs
80 mm 0.04 kg / 0.09 LBS
251 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.04 kg / 0.08 LBS
~0 Gs
90 mm 0.02 kg / 0.05 LBS
189 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
146 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and sheet setup. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Planning to create a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Be careful that when bringing together two magnets, the pinch force is huge. The levitation is a bit weaker than the attraction, but still large.
*Field value in repulsion mode reaches ~0 Gs at the geometric center of the gap (resulting from vector opposition).
* Figures demonstrate friction force of two matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - precautionary measures
MPL 20x20x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.0 cm
Hearing aid 10 Gs (1.0 mT) 11.0 cm
Mechanical watch 20 Gs (2.0 mT) 8.5 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
A strong magnetic field is a serious hazard to electronics as well as medical implants. These magnets produce a field that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and housings. Special caution must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MPL 20x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.10 km/h
(4.75 m/s)
 0.68 J
30 mm 28.02 km/h
(7.78 m/s)
 1.82 J
50 mm 36.13 km/h
(10.04 m/s)
 3.02 J
100 mm 51.09 km/h
(14.19 m/s)
 6.04 J
Magnetic elements are very brittle – a strong collision with metal can result in shattering. Control the attraction moment – a magnet released freely becomes dangerous. Impact energy can destroy the magnet or injury to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when handling with large magnets.

Table 9: Anti-corrosion coating durability
MPL 20x20x20 / 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: Electrical data (Pc)
MPL 20x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 017 Mx 220.2 µWb
Pc Coefficient 0.84 High (Stable)
Flux value passing through the magnet pole. Key data when building generators as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MPL 20x20x20 / N38

Environment Effective steel pull Effect
Air (land) 15.40 kg Standard
Water (riverbed) 17.63 kg
(+2.23 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.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Note: On a vertical surface, the magnet holds just approx. 20-30% of its max power.

2. Steel saturation

*Thin steel (e.g. computer case) drastically reduces 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) = 0.84

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
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%
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: 020129-2026
Magnet Unit Converter
Magnet pull force
Magnetic Induction
Input a value in any box, and the remaining units convert automatically.

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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 20x20x20 mm and a weight of 60 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 15.40 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding 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 15.40 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. 15.40 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 20x20x20 / N38, we recommend utilizing 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 clean and degrease 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 (20x20 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), 20 mm (width), and 20 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 15.40 kg (force ~151.12 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • Their magnetic field remains stable, and after around 10 years it decreases only by ~1% (according to research),
  • Neodymium magnets are extremely resistant to magnetic field loss caused by external magnetic fields,
  • In other words, due to the aesthetic finish of nickel, the element becomes visually attractive,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • 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...
  • In view of the ability of flexible molding and customization to individualized requirements, magnetic components can be produced in a variety of shapes and sizes, which expands the range of possible applications,
  • Huge importance in modern industrial fields – they are utilized in HDD drives, electric drive systems, medical equipment, also complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength 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
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using casing - magnetic mount.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

Information about lifting capacity was determined for optimal configuration, assuming:
  • with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with an ground contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • under perpendicular application of breakaway force (90-degree angle)
  • at temperature room level

Lifting capacity in practice – influencing factors

Holding efficiency is affected by specific conditions, mainly (from most important):
  • Clearance – existence of foreign body (paint, tape, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick plate does not close the flux, causing part of the power to be lost into the air.
  • Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate reduces the load capacity.

Warnings
Physical harm

Big blocks can smash fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.

ICD Warning

People with a pacemaker should maintain an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Impact on smartphones

GPS units and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Nickel coating and allergies

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, cease handling magnets and wear gloves.

Power loss in heat

Keep cool. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Handling guide

Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Data carriers

Do not bring magnets near a wallet, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.

Fire risk

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Fragile material

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

No play value

Always store magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are tragic.

Warning! Want to know more? Read our article: Are neodymium magnets dangerous?