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MPL 20x8x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020133

GTIN/EAN: 5906301811398

5.00

length

20 mm [±0,1 mm]

Width

8 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

4.8 g

Magnetization Direction

↑ axial

Load capacity

4.79 kg / 46.98 N

Magnetic Induction

336.99 mT / 3370 Gs

Coating

[NiCuNi] Nickel

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3.67 ZŁ with VAT / pcs + price for transport

2.98 ZŁ net + 23% VAT / pcs

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Technical specification - MPL 20x8x4 / N38 - lamellar magnet

Specification / characteristics - MPL 20x8x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020133
GTIN/EAN 5906301811398
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 8 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 4.8 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.79 kg / 46.98 N
Magnetic Induction ~ ? 336.99 mT / 3370 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x8x4 / 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 simulation of the magnet - technical parameters

These data constitute the direct effect of a mathematical analysis. Results are based on models for the class Nd2Fe14B. Operational performance may differ. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs distance) - power drop
MPL 20x8x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3368 Gs
336.8 mT
 4.79 kg / 10.56 LBS
4790.0 g / 47.0 N
 strong
1 mm 2818 Gs
281.8 mT
 3.35 kg / 7.39 LBS
3352.3 g / 32.9 N
 strong
2 mm 2266 Gs
226.6 mT
 2.17 kg / 4.78 LBS
2167.6 g / 21.3 N
 strong
3 mm 1794 Gs
179.4 mT
 1.36 kg / 3.00 LBS
1358.6 g / 13.3 N
 weak grip
5 mm 1130 Gs
113.0 mT
 0.54 kg / 1.19 LBS
538.9 g / 5.3 N
 weak grip
10 mm 416 Gs
41.6 mT
 0.07 kg / 0.16 LBS
73.0 g / 0.7 N
 weak grip
15 mm 187 Gs
18.7 mT
 0.01 kg / 0.03 LBS
14.7 g / 0.1 N
 weak grip
20 mm 97 Gs
9.7 mT
 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
 weak grip
30 mm 35 Gs
3.5 mT
 0.00 kg / 0.00 LBS
0.5 g / 0.0 N
 weak grip
50 mm 9 Gs
0.9 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Grip strength weakens drastically per each millimeter of distance. Keep in mind that even a microscopic distance (e.g., dirt, varnish, rust) noticeably reduces the pull force. Magnets work optimally during direct contact; gap nullifies the power. Observe how flashily the parameters fall, when the product does not touch tightly to the metal substrate. When planning the mounting, discard additional spacers.

Table 2: Sliding capacity (vertical surface)
MPL 20x8x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.96 kg / 2.11 LBS
958.0 g / 9.4 N
1 mm Stal (~0.2) 0.67 kg / 1.48 LBS
670.0 g / 6.6 N
2 mm Stal (~0.2) 0.43 kg / 0.96 LBS
434.0 g / 4.3 N
3 mm Stal (~0.2) 0.27 kg / 0.60 LBS
272.0 g / 2.7 N
5 mm Stal (~0.2) 0.11 kg / 0.24 LBS
108.0 g / 1.1 N
10 mm Stal (~0.2) 0.01 kg / 0.03 LBS
14.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data presents the theoretical weight limit required to initiate the downward movement of the magnet vertically along a upright steel wall (assuming typical friction). This parameter depends on the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 20x8x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.44 kg / 3.17 LBS
1437.0 g / 14.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.96 kg / 2.11 LBS
958.0 g / 9.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.48 kg / 1.06 LBS
479.0 g / 4.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.40 kg / 5.28 LBS
2395.0 g / 23.5 N
When placing a element on a upright wall (e.g., a car body), it will maintain barely approx. 1/5 of its maximum pull force. Gravitational force and a low friction coefficient mean that holders slide down easier than they pop off the substrate. Designing a wall mount? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will slip down under a much lighter weight. Using a rubber pad can significantly improve the result.

Table 4: Material efficiency (saturation) - power losses
MPL 20x8x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.48 kg / 1.06 LBS
479.0 g / 4.7 N
1 mm
25%
 1.20 kg / 2.64 LBS
1197.5 g / 11.7 N
2 mm
50%
 2.40 kg / 5.28 LBS
2395.0 g / 23.5 N
3 mm
75%
 3.59 kg / 7.92 LBS
3592.5 g / 35.2 N
5 mm
100%
 4.79 kg / 10.56 LBS
4790.0 g / 47.0 N
10 mm
100%
 4.79 kg / 10.56 LBS
4790.0 g / 47.0 N
11 mm
100%
 4.79 kg / 10.56 LBS
4790.0 g / 47.0 N
12 mm
100%
 4.79 kg / 10.56 LBS
4790.0 g / 47.0 N
A too thin steel is not enough to take in the full magnetic flux, which weakens actual performance of the holder. Should you attach a powerful product to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To achieve the maximum of this neodymium's power, you require a sufficiently solid piece of metal. The saturation phenomenon means that on delicate walls (e.g., car bodies), the holder works worse. We suggest choosing the steel thickness according to the table below.

Table 5: Working in heat (stability) - resistance threshold
MPL 20x8x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.79 kg / 10.56 LBS
4790.0 g / 47.0 N
 OK
40 °C -2.2% 4.68 kg / 10.33 LBS
4684.6 g / 46.0 N
 OK
60 °C -4.4% 4.58 kg / 10.10 LBS
4579.2 g / 44.9 N
80 °C -6.6% 4.47 kg / 9.86 LBS
4473.9 g / 43.9 N
100 °C -28.8% 3.41 kg / 7.52 LBS
3410.5 g / 33.5 N
Ordinary NdFeB products change their properties parameters above the temperature limit. Protect against heat – high temperature can irreversibly damage this magnet. With increasing heat, the magnet's capacity momentarily decreases. Refrain from using this magnet close to ovens higher than its safe range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 20x8x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 11.19 kg / 24.67 LBS
4 784 Gs
1.68 kg / 3.70 LBS
1678 g / 16.5 N
 N/A
1 mm 9.49 kg / 20.93 LBS
6 205 Gs
1.42 kg / 3.14 LBS
1424 g / 14.0 N
 8.54 kg / 18.84 LBS
~0 Gs
2 mm 7.83 kg / 17.26 LBS
5 635 Gs
1.17 kg / 2.59 LBS
1175 g / 11.5 N
 7.05 kg / 15.54 LBS
~0 Gs
3 mm 6.34 kg / 13.97 LBS
5 069 Gs
0.95 kg / 2.10 LBS
951 g / 9.3 N
 5.70 kg / 12.57 LBS
~0 Gs
5 mm 4.02 kg / 8.85 LBS
4 035 Gs
0.60 kg / 1.33 LBS
602 g / 5.9 N
 3.61 kg / 7.97 LBS
~0 Gs
10 mm 1.26 kg / 2.78 LBS
2 259 Gs
0.19 kg / 0.42 LBS
189 g / 1.9 N
 1.13 kg / 2.50 LBS
~0 Gs
20 mm 0.17 kg / 0.38 LBS
832 Gs
0.03 kg / 0.06 LBS
26 g / 0.3 N
 0.15 kg / 0.34 LBS
~0 Gs
50 mm 0.00 kg / 0.01 LBS
112 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
70 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
46 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
32 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
23 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
17 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products attract each other from a wider radius than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of operation. Planning to create a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is huge. The repulsion force is slightly lower than the attraction, but still significant.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Attention: Estimates show friction force of dual identical magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - warnings
MPL 20x8x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field is a serious hazard to IT equipment as well as medical implants. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
MPL 20x8x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 32.16 km/h
(8.93 m/s)
 0.19 J
30 mm 55.18 km/h
(15.33 m/s)
 0.56 J
50 mm 71.24 km/h
(19.79 m/s)
 0.94 J
100 mm 100.75 km/h
(27.99 m/s)
 1.88 J
Neodymium magnets are very brittle – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or painful pinches to fingers. Be sure to control the product during mounting so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 20x8x4 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MPL 20x8x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 277 Mx 52.8 µWb
Pc Coefficient 0.38 Low (Flat)
Flux value emitted by the pole surface. Key data when building generators and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 20x8x4 / N38

Environment Effective steel pull Effect
Air (land) 4.79 kg Standard
Water (riverbed) 5.48 kg
(+0.69 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!
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Sliding resistance

*Caution: On a vertical surface, the magnet holds just ~20% of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

*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) = 0.38

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
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%
Sustainability
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: 020133-2026
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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 20x8x4 mm and a weight of 4.8 g, guarantees premium class connection. This rectangular block with a force of 46.98 N is ready for shipment in 24h, allowing for rapid realization of your project. 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. To separate the MPL 20x8x4 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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 wind generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
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).
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 (20x8 mm), which is ideal for flat mounting. 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), 8 mm (width), and 4 mm (thickness). It is a magnetic block with dimensions 20x8x4 mm and a self-weight of 4.8 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of rare earth magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • Their power remains stable, and after approximately 10 years it drops only by ~1% (according to research),
  • Neodymium magnets are characterized by exceptionally resistant to magnetic field loss caused by external magnetic fields,
  • The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to look better,
  • Neodymium magnets deliver maximum magnetic induction on a small area, which increases force concentration,
  • 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 precise modeling and optimizing to concrete conditions,
  • Universal use in advanced technology sectors – they are used in magnetic memories, electric drive systems, advanced medical instruments, also multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Weaknesses

Problematic aspects of neodymium magnets and proposals for their use:
  • At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We suggest cover - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what affects it?

The force parameter is a measurement result executed under specific, ideal conditions:
  • using a base made of low-carbon steel, acting as a magnetic yoke
  • possessing a thickness of minimum 10 mm to avoid saturation
  • characterized by even structure
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial force direction (90-degree angle)
  • in neutral thermal conditions

Magnet lifting force in use – key factors

During everyday use, the actual lifting capacity is determined by several key aspects, listed from crucial:
  • Clearance – existence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Steel grade – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
  • Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate reduces the load capacity.

Safety rules for work with neodymium magnets
Material brittleness

Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Immense force

Use magnets with awareness. Their immense force can shock even experienced users. Stay alert and respect their power.

Medical implants

For implant holders: Strong magnetic fields disrupt medical devices. Keep at least 30 cm distance or ask another person to handle the magnets.

Heat sensitivity

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Allergy Warning

Some people suffer from a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact can result in dermatitis. We suggest wear protective gloves.

Precision electronics

Note: neodymium magnets produce a field that interferes with sensitive sensors. Keep a safe distance from your phone, tablet, and navigation systems.

Adults only

These products are not suitable for play. Accidental ingestion of multiple magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.

Electronic hazard

Equipment safety: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Dust explosion hazard

Powder created during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Hand protection

Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.

Important! Looking for details? Read our article: Are neodymium magnets dangerous?