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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

see parameters »

33.21 ZŁ with VAT / pcs + price for transport

27.00 ZŁ net + 23% VAT / pcs

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Lifting power as well as appearance of a neodymium magnet can be analyzed with our force calculator.

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Detailed specification - 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

Engineering analysis of the product - report

The following information are the direct effect of a physical calculation. Results rely on models for the material Nd2Fe14B. Actual parameters may differ. Please consider these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - characteristics
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 pounds
15400.0 g / 151.1 N
 dangerous!
1 mm 4910 Gs
491.0 mT
 12.73 kg / 28.07 pounds
12732.2 g / 124.9 N
 dangerous!
2 mm 4423 Gs
442.3 mT
 10.33 kg / 22.77 pounds
10328.3 g / 101.3 N
 dangerous!
3 mm 3955 Gs
395.5 mT
 8.26 kg / 18.21 pounds
8258.3 g / 81.0 N
 medium risk
5 mm 3114 Gs
311.4 mT
 5.12 kg / 11.29 pounds
5120.3 g / 50.2 N
 medium risk
10 mm 1671 Gs
167.1 mT
 1.48 kg / 3.25 pounds
1475.0 g / 14.5 N
 weak grip
15 mm 936 Gs
93.6 mT
 0.46 kg / 1.02 pounds
463.0 g / 4.5 N
 weak grip
20 mm 562 Gs
56.2 mT
 0.17 kg / 0.37 pounds
167.1 g / 1.6 N
 weak grip
30 mm 244 Gs
24.4 mT
 0.03 kg / 0.07 pounds
31.3 g / 0.3 N
 weak grip
50 mm 73 Gs
7.3 mT
 0.00 kg / 0.01 pounds
2.8 g / 0.0 N
 weak grip
Grip strength decreases significantly with every mm of gap. Keep in mind that even the smallest gap (e.g., dirt, varnish, rust) significantly weakens the grip. Magnets work most effectively during direct contact; distance nullifies the force. Notice how rapidly the load capacity fall, when the product does not adhere directly to the metal substrate. When calculating the arrangement, eliminate redundant distances.

Table 2: Sliding 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 pounds
3080.0 g / 30.2 N
1 mm Stal (~0.2) 2.55 kg / 5.61 pounds
2546.0 g / 25.0 N
2 mm Stal (~0.2) 2.07 kg / 4.55 pounds
2066.0 g / 20.3 N
3 mm Stal (~0.2) 1.65 kg / 3.64 pounds
1652.0 g / 16.2 N
5 mm Stal (~0.2) 1.02 kg / 2.26 pounds
1024.0 g / 10.0 N
10 mm Stal (~0.2) 0.30 kg / 0.65 pounds
296.0 g / 2.9 N
15 mm Stal (~0.2) 0.09 kg / 0.20 pounds
92.0 g / 0.9 N
20 mm Stal (~0.2) 0.03 kg / 0.07 pounds
34.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data calculates the theoretical force sufficient to start the sliding of the magnet downwards along a vertical steel wall (assuming typical friction coefficient). The holding force varies with the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 pounds
4620.0 g / 45.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.08 kg / 6.79 pounds
3080.0 g / 30.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.54 kg / 3.40 pounds
1540.0 g / 15.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.70 kg / 16.98 pounds
7700.0 g / 75.5 N
When placing a holder on a upright plane (e.g., a board), it will maintain barely about 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that magnets move down easier than they pop off the substrate. Want to create a vertical fastening? Remember that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the holder will slide down under a significantly smaller load. Utilizing a rubberized coating can drastically raise the stability.

Table 4: Material efficiency (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 pounds
770.0 g / 7.6 N
1 mm
13%
 1.93 kg / 4.24 pounds
1925.0 g / 18.9 N
2 mm
25%
 3.85 kg / 8.49 pounds
3850.0 g / 37.8 N
3 mm
38%
 5.78 kg / 12.73 pounds
5775.0 g / 56.7 N
5 mm
63%
 9.63 kg / 21.22 pounds
9625.0 g / 94.4 N
10 mm
100%
 15.40 kg / 33.95 pounds
15400.0 g / 151.1 N
11 mm
100%
 15.40 kg / 33.95 pounds
15400.0 g / 151.1 N
12 mm
100%
 15.40 kg / 33.95 pounds
15400.0 g / 151.1 N
A thin metal plate is unable to conduct the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this magnet's potential, you need a suitably thick element of metal. The saturation effect causes that on sheet metal structures (e.g., car bodies), the magnet works worse. We advise picking the steel thickness based on the following data.

Table 5: Thermal stability (stability) - resistance threshold
MPL 20x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 15.40 kg / 33.95 pounds
15400.0 g / 151.1 N
 OK
40 °C -2.2% 15.06 kg / 33.20 pounds
15061.2 g / 147.8 N
 OK
60 °C -4.4% 14.72 kg / 32.46 pounds
14722.4 g / 144.4 N
 OK
80 °C -6.6% 14.38 kg / 31.71 pounds
14383.6 g / 141.1 N
100 °C -28.8% 10.96 kg / 24.17 pounds
10964.8 g / 107.6 N
Ordinary NdFeB products lose power after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently damage this product. With every degree above norm, the magnet's power temporarily lowers. Refrain from using this product near heat sources exceeding its working range. Too high temperature will lead to permanent loss of magnetism.
*Technical advisory: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization under lower heat stress than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 20x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 71.92 kg / 158.55 pounds
5 962 Gs
10.79 kg / 23.78 pounds
10787 g / 105.8 N
 N/A
1 mm 65.60 kg / 144.63 pounds
10 316 Gs
9.84 kg / 21.69 pounds
9840 g / 96.5 N
 59.04 kg / 130.16 pounds
~0 Gs
2 mm 59.46 kg / 131.08 pounds
9 821 Gs
8.92 kg / 19.66 pounds
8919 g / 87.5 N
 53.51 kg / 117.97 pounds
~0 Gs
3 mm 53.66 kg / 118.30 pounds
9 329 Gs
8.05 kg / 17.74 pounds
8049 g / 79.0 N
 48.29 kg / 106.47 pounds
~0 Gs
5 mm 43.20 kg / 95.24 pounds
8 371 Gs
6.48 kg / 14.29 pounds
6480 g / 63.6 N
 38.88 kg / 85.71 pounds
~0 Gs
10 mm 23.91 kg / 52.72 pounds
6 228 Gs
3.59 kg / 7.91 pounds
3587 g / 35.2 N
 21.52 kg / 47.44 pounds
~0 Gs
20 mm 6.89 kg / 15.19 pounds
3 343 Gs
1.03 kg / 2.28 pounds
1033 g / 10.1 N
 6.20 kg / 13.67 pounds
~0 Gs
50 mm 0.32 kg / 0.71 pounds
721 Gs
0.05 kg / 0.11 pounds
48 g / 0.5 N
 0.29 kg / 0.64 pounds
~0 Gs
60 mm 0.15 kg / 0.32 pounds
487 Gs
0.02 kg / 0.05 pounds
22 g / 0.2 N
 0.13 kg / 0.29 pounds
~0 Gs
70 mm 0.07 kg / 0.16 pounds
344 Gs
0.01 kg / 0.02 pounds
11 g / 0.1 N
 0.07 kg / 0.14 pounds
~0 Gs
80 mm 0.04 kg / 0.09 pounds
251 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
90 mm 0.02 kg / 0.05 pounds
189 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
146 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
Two strong neodymiums interact from a wider radius than a magnet and sheet combination. Such a system of magnet-to-magnet generates a stronger field and a wider radius of action. Planning to create a powerful holder? Apply two magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the pinch force is massive. The repulsion force is marginally weaker than the attraction, but still impressive.
*Field value in repulsion mode is approximately ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Important: Estimates demonstrate shear force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (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
Extremely neodym field is a large risk to electronics as well as pacemakers. These magnets produce a field that disrupts operation of sensitive medical devices. Notice: the unseen radiation passes through tissues and plastic. Exceptional care must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
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 prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or injury to skin. Hold the magnet firmly during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Use safety goggles when working with powerful specimens.

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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MPL 20x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 017 Mx 220.2 µWb
Pc Coefficient 0.84 High (Stable)
Total magnetic flux passing through the pole surface. Key data for generator designers as well as sensors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Sliding resistance

*Note: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Temperature resistance

*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%
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: 020129-2026
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Model MPL 20x20x20 / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 151.12 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 20x20x20 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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 20x20x20 / N38 model is magnetized through the thickness (dimension 20 mm), which means that the N and S poles are located on its largest, flat surfaces. 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.
This model is characterized by dimensions 20x20x20 mm, which, at a weight of 60 g, makes it an element with high energy density. It is a magnetic block with dimensions 20x20x20 mm and a self-weight of 60 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of rare earth magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • They maintain their magnetic properties even under external field action,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the top side of the magnet is maximum,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of detailed machining and modifying to precise needs,
  • Wide application in innovative solutions – they are utilized in data components, brushless drives, advanced medical instruments, also complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in force. 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited ability of producing threads in the magnet and complicated shapes - preferred is casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small components of these devices are able to be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Breakaway force is the result of a measurement for the most favorable conditions, including:
  • using a plate made of low-carbon steel, functioning as a magnetic yoke
  • possessing a thickness of at least 10 mm to avoid saturation
  • with an polished touching surface
  • under conditions of no distance (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Impact of factors on magnetic holding capacity in practice

Please note that the application force will differ influenced by elements below, starting with the most relevant:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface condition – smooth surfaces ensure maximum contact, which increases force. Rough surfaces weaken the grip.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Warnings
Safe operation

Handle magnets with awareness. Their powerful strength can shock even professionals. Plan your moves and do not underestimate their power.

Magnetic media

Powerful magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Magnets are brittle

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Life threat

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Product not for children

Strictly store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are fatal.

Sensitization to coating

It is widely known that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, prevent direct skin contact and select encased magnets.

GPS and phone interference

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Combustion hazard

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Power loss in heat

Avoid heat. NdFeB magnets are sensitive to heat. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Crushing force

Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand betwixt two strong magnets.

Caution! Details about risks in the article: Magnet Safety Guide.