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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 specifications »

33.21 ZŁ with VAT / pcs + price for transport

27.00 ZŁ net + 23% VAT / pcs

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Technical 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 product - report

Presented data constitute the direct effect of a engineering analysis. Values rely on algorithms for the class Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - 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 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
 medium risk
5 mm 3114 Gs
311.4 mT
 5.12 kg / 11.29 lbs
5120.3 g / 50.2 N
 medium risk
10 mm 1671 Gs
167.1 mT
 1.48 kg / 3.25 lbs
1475.0 g / 14.5 N
 safe
15 mm 936 Gs
93.6 mT
 0.46 kg / 1.02 lbs
463.0 g / 4.5 N
 safe
20 mm 562 Gs
56.2 mT
 0.17 kg / 0.37 lbs
167.1 g / 1.6 N
 safe
30 mm 244 Gs
24.4 mT
 0.03 kg / 0.07 lbs
31.3 g / 0.3 N
 safe
50 mm 73 Gs
7.3 mT
 0.00 kg / 0.01 lbs
2.8 g / 0.0 N
 safe
Grip strength drops drastically with every mm of distance. Remember that even a microscopic distance (e.g., dirt, paint, veneer) significantly diminishes the holding power. Magnetic products work most effectively during direct contact; distance weakens the force. Observe how rapidly the pull force fall, when the product does not touch directly to the metal substrate. When planning the mounting, avoid unnecessary gaps.

Table 2: Shear force (wall)
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
This section presents the approximate force necessary to initiate the shifting of the magnet downwards on a vertical metal surface (considering standard friction). This value varies with the separation distance between the magnet and the surface.

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 mounting a element on a vertical surface (e.g., a car body), it will only hold only approx. 1/5 of nominal attraction strength. Gravity as well as a weak degree of grip influence the fact that magnets slide down easier than they detach. Planning a vertical fastening? Remember that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the magnet will slide down under a noticeably lighter weight. Using a rubber pad can drastically 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 thin metal plate is unable to conduct the entire magnetic field, which wastes potential of the holder. If you attach a powerful product to a too thin substrate, the magnetism will pass right through and the attraction force will be weaker. To utilize 100% of this magnet's potential, you need a suitably thick element of metal. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the holder works worse. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - 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
Classic neodymiums lose strength past the thermal threshold. Watch out for overheating – heat can permanently demagnetize this product. As the temperature rises, the neodymium's capacity momentarily lowers. Avoid using this magnet close to heaters exceeding its safe range. Exceeding the critical threshold will result in destruction of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) are more susceptible to demagnetization under lower heat stress than taller cylinders. Warning indicator in the table indicates permanent field degradation for this particular item.

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 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 strong neodymiums attract each other from a significantly greater distance than a magnet and sheet combination. Such a system of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Planning to create a powerful holder? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is extreme. The levitation is marginally weaker than the connection force, but still large.
*The magnetic induction in repulsion mode drops to ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Important: Estimates demonstrate sliding force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - warnings
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 real danger to electronics as well as medical implants. These neodymiums generate a field that disrupts operation of digital equipment. Notice: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - 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
Neodymium magnets are very brittle – a collision with steel causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or injury to fingers. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A collision at high speed means shattering 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)
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: Construction data (Flux)
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 pole surface. Essential parameter in coil applications as well as sensors. Pc value defines the magnet's operating point.

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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Note: On a vertical surface, the magnet retains only approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely weakens the holding force.

3. Thermal stability

*For N38 grade, 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.

Technical and environmental data
Chemical composition
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
Force (pull)
Field Strength
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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. 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, 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. 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. 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.

Advantages and disadvantages of neodymium magnets.

Advantages

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They do not lose magnetism, even during around ten years – the drop in strength is only ~1% (based on measurements),
  • Neodymium magnets are extremely resistant to demagnetization caused by external field sources,
  • By using a smooth layer of silver, the element presents an professional look,
  • Neodymium magnets create maximum magnetic induction on a small surface, which increases force concentration,
  • 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...
  • Possibility of exact creating and adapting to specific needs,
  • Wide application in advanced technology sectors – they are commonly used in magnetic memories, motor assemblies, diagnostic systems, and technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in realizing nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these devices can complicate diagnosis medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:
  • with the contact of a yoke made of special test steel, guaranteeing full magnetic saturation
  • possessing a thickness of minimum 10 mm to avoid saturation
  • characterized by even structure
  • with direct contact (no paint)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Holding efficiency impacted by working environment parameters, such as (from most important):
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Steel grade – the best choice is pure iron steel. Cast iron may attract less.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the holding force is lower. In addition, even a small distance between the magnet and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Avoid contact if allergic

It is widely known that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands and opt for coated magnets.

Phone sensors

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can ruin the internal compass in your phone.

Material brittleness

Protect your eyes. Magnets can explode upon violent connection, ejecting shards into the air. Eye protection is mandatory.

Product not for children

Strictly store magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are tragic.

Serious injuries

Mind your fingers. Two large magnets will snap together immediately with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Magnetic media

Data protection: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, medical aids, timepieces).

ICD Warning

Warning for patients: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Thermal limits

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.

Combustion hazard

Powder created during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Respect the power

Handle magnets with awareness. Their huge power can shock even experienced users. Stay alert and respect their power.

Warning! More info about hazards in the article: Magnet Safety Guide.