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MPL 20x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020129

GTIN/EAN: 5906301811350

5.00
Load capacity 15.40 kg / 151.12 N Magnetic Induction 540.22 mT / 5402 Gs
length
20 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
60 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
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33.21 zł with VAT / pcs + price for transport

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical data of the product - 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 represent the direct effect of a engineering simulation. Results were calculated on models for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these data as a reference point when designing systems.

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 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
 strong
5 mm 3114 Gs
311.4 mT
 5.12 kg / 11.29 pounds
5120.3 g / 50.2 N
 strong
10 mm 1671 Gs
167.1 mT
 1.48 kg / 3.25 pounds
1475.0 g / 14.5 N
 low risk
15 mm 936 Gs
93.6 mT
 0.46 kg / 1.02 pounds
463.0 g / 4.5 N
 low risk
20 mm 562 Gs
56.2 mT
 0.17 kg / 0.37 pounds
167.1 g / 1.6 N
 low risk
30 mm 244 Gs
24.4 mT
 0.03 kg / 0.07 pounds
31.3 g / 0.3 N
 low risk
50 mm 73 Gs
7.3 mT
 0.00 kg / 0.01 pounds
2.8 g / 0.0 N
 low risk
Pulling power weakens sharply with every mm of gap. Keep in mind that even the smallest gap (e.g., dirt, paint, veneer) strongly reduces the pull force. Neodymiums operate optimally during direct contact; gap weakens the force. Observe how rapidly the parameters fall, when the product does not touch tightly to the steel surface. When designing the arrangement, discard unnecessary gaps.

Table 2: Vertical capacity (wall)
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
This section indicates the estimated force sufficient to start the shifting of the magnet down on a upright steel plate (assuming standard friction coefficient). The holding force depends on the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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 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 magnet on a upright wall (e.g., a board), it will maintain just about 20%-30% of nominal attraction strength. Gravity and a weak degree of grip cause that holders slip easier than they detach. Want to create a vertical fastening? Remember that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the magnet will slip down under a much lighter load. Using a rubber layer can significantly increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 too thin steel is not enough to absorb the full magnetic flux, which wastes potential of the magnet. Should you mount a strong magnet to a thin surface, the field will penetrate right through and the attraction force will be weaker. To utilize the maximum of this magnet's power, you require a sufficiently solid backing of metal. The saturation effect causes that on delicate walls (e.g., appliance housings), the magnet holds weaker. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal stability (material behavior) - thermal limit
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 strength above the temperature limit. Watch out for overheating – high temperature can permanently damage this product. With every degree above norm, the neodymium's power momentarily drops. Avoid using this magnet near heat sources exceeding its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetism.
*Engineering note: Thermal stability is determined by both grade, but also on the magnet's shape. Flat magnets (pancake types) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table signals permanent field degradation for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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 magnets attract each other from a much further distance than a neodymium and metal combination. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of operation. Planning to create a strong closure? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the impact force is extreme. The repulsion force is slightly lower than the connection force, but still large.
*Flux density for N-N configuration is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Note: Results demonstrate sliding force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - 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
Phone / Smartphone 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 poses a serious hazard to electronics and pacemakers. These neodymiums generate a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field acts through matter and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.29 km/h
(4.53 m/s)
 0.61 J
30 mm 17.12 km/h
(4.76 m/s)
 0.68 J
50 mm 17.15 km/h
(4.76 m/s)
 0.68 J
100 mm 17.15 km/h
(4.76 m/s)
 0.68 J
Magnetic elements are delicate – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Coating parameters (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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

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 emitted by the pole surface. Essential parameter when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds merely approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Thermal stability

*For N38 material, the safety 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.

Engineering data and GPSR

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: 020129-2026
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This product is an extremely strong magnet in the shape of a plate 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. Furthermore, 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. 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 invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 20x20x20 / 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 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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
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 compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their power is durable, and after around 10 years it decreases only by ~1% (according to research),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnets have very high magnetic induction on the working surface,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of individual creating as well as optimizing to defined requirements,
  • Huge importance in future technologies – they find application in magnetic memories, electromotive mechanisms, medical devices, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices

Weaknesses

What to avoid - cons of neodymium magnets and ways of using them
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • 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.
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complex shapes in magnets, we recommend using casing - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these products can be problematic in diagnostics medical after entering the body.
  • Due to neodymium price, their price exceeds standard values,

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

The specified lifting capacity refers to the maximum value, obtained under ideal test conditions, namely:
  • on a plate made of mild steel, perfectly concentrating the magnetic field
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • with total lack of distance (no coatings)
  • during detachment in a direction vertical to the mounting surface
  • at ambient temperature room level

Lifting capacity in real conditions – factors

During everyday use, the actual lifting capacity depends on several key aspects, presented from most significant:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material composition – different alloys reacts the same. High carbon content weaken the attraction effect.
  • Smoothness – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate decreases the holding force.

H&S for magnets
Safe distance

Powerful magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Physical harm

Mind your fingers. Two large magnets will join instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Heat sensitivity

Do not overheat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Danger to pacemakers

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

Fire warning

Dust generated during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Allergic reactions

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, prevent touching magnets with bare hands and opt for coated magnets.

Precision electronics

Note: neodymium magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, tablet, and GPS.

Magnet fragility

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Clashing of two magnets leads to them cracking into small pieces.

Handling rules

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

No play value

These products are not intended for children. Eating multiple magnets can lead to them attracting across intestines, which poses a critical condition and necessitates immediate surgery.

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