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MPL 20x5x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020131

GTIN/EAN: 5906301811374

5.00

length

20 mm [±0,1 mm]

Width

5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

2.25 g

Magnetization Direction

↑ axial

Load capacity

3.46 kg / 33.93 N

Magnetic Induction

358.88 mT / 3589 Gs

Coating

[NiCuNi] Nickel

technical specifications »

1.058 ZŁ with VAT / pcs + price for transport

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Product card - MPL 20x5x3 / N38 - lamellar magnet

Specification / characteristics - MPL 20x5x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020131
GTIN/EAN 5906301811374
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 5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 2.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.46 kg / 33.93 N
Magnetic Induction ~ ? 358.88 mT / 3589 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x5x3 / 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 assembly - report

The following values are the outcome of a physical calculation. Values were calculated on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ. Use these data as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - interaction chart
MPL 20x5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3585 Gs
358.5 mT
 3.46 kg / 7.63 LBS
3460.0 g / 33.9 N
 warning
1 mm 2619 Gs
261.9 mT
 1.85 kg / 4.07 LBS
1846.6 g / 18.1 N
 weak grip
2 mm 1818 Gs
181.8 mT
 0.89 kg / 1.96 LBS
889.8 g / 8.7 N
 weak grip
3 mm 1279 Gs
127.9 mT
 0.44 kg / 0.97 LBS
440.2 g / 4.3 N
 weak grip
5 mm 696 Gs
69.6 mT
 0.13 kg / 0.29 LBS
130.6 g / 1.3 N
 weak grip
10 mm 225 Gs
22.5 mT
 0.01 kg / 0.03 LBS
13.6 g / 0.1 N
 weak grip
15 mm 97 Gs
9.7 mT
 0.00 kg / 0.01 LBS
2.5 g / 0.0 N
 weak grip
20 mm 49 Gs
4.9 mT
 0.00 kg / 0.00 LBS
0.6 g / 0.0 N
 weak grip
30 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 weak grip
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Grip strength weakens sharply per each millimeter of gap. Note that even a microscopic distance (e.g., contamination, varnish, dust) noticeably diminishes the holding power. Neodymiums work strongest during direct contact; distance nullifies the force. Notice how flashily the load capacity plummet, when the product does not adhere flatly to the metal substrate. When calculating the mounting, discard redundant distances.

Table 2: Vertical capacity (vertical surface)
MPL 20x5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.69 kg / 1.53 LBS
692.0 g / 6.8 N
1 mm Stal (~0.2) 0.37 kg / 0.82 LBS
370.0 g / 3.6 N
2 mm Stal (~0.2) 0.18 kg / 0.39 LBS
178.0 g / 1.7 N
3 mm Stal (~0.2) 0.09 kg / 0.19 LBS
88.0 g / 0.9 N
5 mm Stal (~0.2) 0.03 kg / 0.06 LBS
26.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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 indicates the theoretical weight limit sufficient to start the downward movement of the magnet down on a vertical steel plate (assuming standard friction coefficient). This value is relative to the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 20x5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.04 kg / 2.29 LBS
1038.0 g / 10.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.69 kg / 1.53 LBS
692.0 g / 6.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.35 kg / 0.76 LBS
346.0 g / 3.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.73 kg / 3.81 LBS
1730.0 g / 17.0 N
When mounting a element on a upright wall (e.g., a board), it will maintain barely about 1/5 of its maximum pull force. Gravity and a weak degree of grip influence the fact that magnets move down faster than they detach. Designing a vertical fastening? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will give way down under a significantly smaller load. Application of an anti-slip coating can significantly raise the stability.

Table 4: Steel thickness (saturation) - power losses
MPL 20x5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.35 kg / 0.76 LBS
346.0 g / 3.4 N
1 mm
25%
 0.87 kg / 1.91 LBS
865.0 g / 8.5 N
2 mm
50%
 1.73 kg / 3.81 LBS
1730.0 g / 17.0 N
3 mm
75%
 2.59 kg / 5.72 LBS
2595.0 g / 25.5 N
5 mm
100%
 3.46 kg / 7.63 LBS
3460.0 g / 33.9 N
10 mm
100%
 3.46 kg / 7.63 LBS
3460.0 g / 33.9 N
11 mm
100%
 3.46 kg / 7.63 LBS
3460.0 g / 33.9 N
12 mm
100%
 3.46 kg / 7.63 LBS
3460.0 g / 33.9 N
A thin metal plate is not enough to take in the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a too thin substrate, the field will penetrate right through and the pull force will drop sharply. To utilize 100% of this neodymium's potential, you need a suitably thick element of steel. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We advise picking the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - resistance threshold
MPL 20x5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.46 kg / 7.63 LBS
3460.0 g / 33.9 N
 OK
40 °C -2.2% 3.38 kg / 7.46 LBS
3383.9 g / 33.2 N
 OK
60 °C -4.4% 3.31 kg / 7.29 LBS
3307.8 g / 32.4 N
80 °C -6.6% 3.23 kg / 7.12 LBS
3231.6 g / 31.7 N
100 °C -28.8% 2.46 kg / 5.43 LBS
2463.5 g / 24.2 N
Ordinary NdFeB products change their properties parameters above the temperature limit. Avoid high temperatures – heat can irreversibly demagnetize this product. With increasing heat, the neodymium's force momentarily lowers. Do not use this product near heat sources higher than its working range. Too high temperature will lead to destruction of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) may lose charge permanently sooner compared to rod magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MPL 20x5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 7.92 kg / 17.47 LBS
4 860 Gs
1.19 kg / 2.62 LBS
1189 g / 11.7 N
 N/A
1 mm 5.94 kg / 13.10 LBS
6 209 Gs
0.89 kg / 1.97 LBS
891 g / 8.7 N
 5.35 kg / 11.79 LBS
~0 Gs
2 mm 4.23 kg / 9.32 LBS
5 238 Gs
0.63 kg / 1.40 LBS
634 g / 6.2 N
 3.81 kg / 8.39 LBS
~0 Gs
3 mm 2.94 kg / 6.49 LBS
4 369 Gs
0.44 kg / 0.97 LBS
441 g / 4.3 N
 2.65 kg / 5.84 LBS
~0 Gs
5 mm 1.42 kg / 3.14 LBS
3 039 Gs
0.21 kg / 0.47 LBS
213 g / 2.1 N
 1.28 kg / 2.82 LBS
~0 Gs
10 mm 0.30 kg / 0.66 LBS
1 393 Gs
0.04 kg / 0.10 LBS
45 g / 0.4 N
 0.27 kg / 0.59 LBS
~0 Gs
20 mm 0.03 kg / 0.07 LBS
450 Gs
0.00 kg / 0.01 LBS
5 g / 0.0 N
 0.03 kg / 0.06 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
56 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
34 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
23 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
16 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
11 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
8 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and steel setup. The setup of magnet-to-magnet produces a massive flux and a larger range of operation. Planning to create a strong closure? Apply two magnets instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the collision energy is huge. The levitation is a bit weaker than the attraction, but still large.
*Flux density for N-N configuration reaches ~0 Gs at the geometric center between the magnets (due to field cancellation).
Important: Figures apply to shear force of two matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - warnings
MPL 20x5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Timepiece 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation is a large risk to IT equipment as well as medical implants. These NdFeB products generate a field that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field passes through tissues and housings. Special caution must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MPL 20x5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 39.65 km/h
(11.01 m/s)
 0.14 J
30 mm 68.50 km/h
(19.03 m/s)
 0.41 J
50 mm 88.43 km/h
(24.56 m/s)
 0.68 J
100 mm 125.06 km/h
(34.74 m/s)
 1.36 J
Neodymium magnets are prone to chipping – a strong collision with metal can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when working with large magnets.

Table 9: Anti-corrosion coating durability
MPL 20x5x3 / 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: Electrical data (Flux)
MPL 20x5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 197 Mx 32.0 µWb
Pc Coefficient 0.36 Low (Flat)
Total magnetic flux emitted by the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MPL 20x5x3 / N38

Environment Effective steel pull Effect
Air (land) 3.46 kg Standard
Water (riverbed) 3.96 kg
(+0.50 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. 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 wall, the magnet retains only a fraction of its max power.

2. Plate thickness effect

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

3. Power loss vs temp

*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) = 0.36

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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
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%
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: 020131-2026
Magnet Unit Converter
Force (pull)
Magnetic Field
Simply complete one field, and the tool fill in everything else automatically.

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Component MPL 20x5x3 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 33.93 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. To separate the MPL 20x5x3 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of generators and material handling systems. Thanks to the flat surface and high force (approx. 3.46 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 20x5x3 / N38, we recommend utilizing 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 20x5x3 / N38 model is magnetized through the thickness (dimension 3 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 20x5x3 mm, which, at a weight of 2.25 g, makes it an element with high energy density. It is a magnetic block with dimensions 20x5x3 mm and a self-weight of 2.25 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of rare earth magnets.

Strengths

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • They retain attractive force for almost 10 years – the loss is just ~1% (based on simulations),
  • Magnets effectively defend themselves against demagnetization caused by external fields,
  • In other words, due to the aesthetic layer of gold, the element becomes visually attractive,
  • Magnets are characterized by excellent magnetic induction on the working surface,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of precise machining as well as adjusting to concrete requirements,
  • Wide application in electronics industry – they are used in magnetic memories, electric drive systems, medical equipment, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in compact constructions

Disadvantages

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend 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 forms in magnets, we recommend using a housing - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small components of these magnets can disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price exceeds standard values,

Lifting parameters

Maximum magnetic pulling force – what contributes to it?

The lifting capacity listed is a result of laboratory testing conducted under the following configuration:
  • on a block made of mild steel, effectively closing the magnetic flux
  • whose transverse dimension reaches at least 10 mm
  • with an ideally smooth touching surface
  • with zero gap (without coatings)
  • under axial force direction (90-degree angle)
  • at room temperature

Magnet lifting force in use – key factors

During everyday use, the actual lifting capacity results from several key aspects, ranked from the most important:
  • Distance – the presence of any layer (paint, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Plate thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be lost into the air.
  • Metal type – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate reduces the load capacity.

Safe handling of neodymium magnets
No play value

Absolutely store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets connecting inside the body are life-threatening.

Power loss in heat

Keep cool. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Hand protection

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

Precision electronics

Be aware: rare earth magnets produce a field that confuses sensitive sensors. Maintain a safe distance from your phone, tablet, and navigation systems.

Dust explosion hazard

Powder generated during cutting of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

ICD Warning

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Avoid contact if allergic

A percentage of the population suffer from a contact allergy to nickel, which is the common plating for NdFeB magnets. Prolonged contact might lead to an allergic reaction. It is best to use protective gloves.

Electronic devices

Device Safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Fragile material

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Handling guide

Exercise caution. Neodymium magnets attract from a distance and connect with massive power, often faster than you can move away.

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