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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

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33.21 ZŁ with VAT / pcs + price for transport

27.00 ZŁ net + 23% VAT / pcs

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Technical data - 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

Technical analysis of the magnet - technical parameters

These data are the result of a mathematical analysis. Results are based on models for the material Nd2Fe14B. Real-world conditions might slightly differ. Please consider these calculations as a reference point when designing systems.

Table 1: Static force (pull vs distance) - 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
 dangerous!
1 mm 4910 Gs
491.0 mT
 12.73 kg / 28.07 LBS
12732.2 g / 124.9 N
 dangerous!
2 mm 4423 Gs
442.3 mT
 10.33 kg / 22.77 LBS
10328.3 g / 101.3 N
 dangerous!
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
 low risk
15 mm 936 Gs
93.6 mT
 0.46 kg / 1.02 LBS
463.0 g / 4.5 N
 low risk
20 mm 562 Gs
56.2 mT
 0.17 kg / 0.37 LBS
167.1 g / 1.6 N
 low risk
30 mm 244 Gs
24.4 mT
 0.03 kg / 0.07 LBS
31.3 g / 0.3 N
 low risk
50 mm 73 Gs
7.3 mT
 0.00 kg / 0.01 LBS
2.8 g / 0.0 N
 low risk
Pulling power decreases drastically with every mm of gap. Remember that even a very thin break (e.g., dirt, varnish, rust) strongly reduces the pull force. Magnetic products operate optimally in perfect adhesion; distance kills the force. See how quickly the pull force plummet, when the magnet does not touch flatly to the metal substrate. When designing the arrangement, eliminate additional spacers.

Table 2: Sliding capacity (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 presents the theoretical weight limit needed to initiate the slippage of the magnet vertically along a vertical steel wall (considering standard friction). This value is a function of the gap size between the magnet and the surface.

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 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 placing a holder on a upright plane (e.g., a car body), it will maintain barely approx. 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient mean that holders slide down faster than they pull off. Planning a hanger? Remember that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the holder will slide down under a noticeably lighter weight. Utilizing a rubberized coating can effectively increase the grip.

Table 4: Material efficiency (saturation) - 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 take in the entire magnetic field, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To utilize the maximum of this neodymium's potential, you need a suitably thick backing of steel. The saturation phenomenon means that on thin elements (e.g., car bodies), the magnet works worse. We recommend selecting the steel thickness from these parameters.

Table 5: Working in heat (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 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
Standard neodymium magnets lose parameters after exceeding the maximum temperature. Protect against heat – excessive heat can permanently destroy this magnet. With every degree above norm, the neodymium's force temporarily drops. Do not use this magnet close to heaters exceeding its working range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) risk losing magnetic properties sooner compared to rod magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
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 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 neodymium and metal combination. Such a system of magnet-to-magnet produces a massive flux and a further horizon of operation. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the collision energy is massive. The levitation is a bit weaker than the connection force, but still large.
*The magnetic induction in repulsion mode drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Important: Estimates show shear force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

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
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Car key 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 large risk to IT equipment as well as medical implants. These magnets generate a field that prevents correct functioning of digital equipment. Notice: the unseen radiation penetrates the body and plastic. Special caution must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (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 delicate – a violent impact against metal risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or painful pinches to fingers. 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 magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Corrosion resistance
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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

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 emitted by the pole surface. Essential parameter in coil applications and motors. Pc value defines the working geometry.

Table 11: Physics of underwater searching
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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. 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 a fraction of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Temperature resistance

*For N38 material, 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 specification and ecology
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
Measurement Calculator
Magnet pull force
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Model MPL 20x20x20 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 15.40 kg), this product is available immediately from our warehouse in Poland. 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. To separate the MPL 20x20x20 / 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. They work great as fasteners 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 20x20x20 / N38, it is best to use two-component adhesives (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).
Standardly, the MPL 20x20x20 / N38 model is magnetized axially (dimension 20 mm), which means that the N and S poles are located on its largest, flat surfaces. 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). 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 protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of rare earth magnets.

Pros

Besides their immense strength, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
  • Magnets very well defend themselves against demagnetization caused by external fields,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnetic induction on the working part of the magnet turns out to be exceptional,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of exact machining and optimizing to complex conditions,
  • Key role in electronics industry – they find application in data components, motor assemblies, precision medical tools, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in miniature devices

Weaknesses

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these magnets can be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

Magnet power was defined for optimal configuration, including:
  • with the use of a yoke made of special test steel, ensuring full magnetic saturation
  • with a cross-section minimum 10 mm
  • with a plane perfectly flat
  • with total lack of distance (without paint)
  • during pulling in a direction vertical to the mounting surface
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

During everyday use, the actual lifting capacity is determined by a number of factors, listed from most significant:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Steel thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Material type – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate reduces the holding force.

Precautions when working with neodymium magnets
Dust is flammable

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Skin irritation risks

A percentage of the population suffer from a contact allergy to nickel, which is the standard coating for NdFeB magnets. Frequent touching may cause a rash. It is best to wear safety gloves.

Swallowing risk

Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep away from kids and pets.

Handling guide

Handle with care. Rare earth magnets attract from a distance and connect with massive power, often faster than you can react.

Protect data

Do not bring magnets close to a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Precision electronics

Navigation devices and mobile phones are highly susceptible to magnetism. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Demagnetization risk

Regular neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Pinching danger

Large magnets can crush fingers in a fraction of a second. Never place your hand between two attracting surfaces.

Medical interference

Warning for patients: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Protective goggles

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

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