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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

product parameters »

1.058 ZŁ with VAT / pcs + price for transport

0.860 ZŁ net + 23% VAT / pcs

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Physical properties - 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

Engineering analysis of the magnet - data

These information constitute the result of a mathematical simulation. Results were calculated on algorithms for the material Nd2Fe14B. Actual performance might slightly differ from theoretical values. Please consider these calculations as a reference point for designers.

Table 1: Static force (pull vs gap) - characteristics
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 pounds
3460.0 g / 33.9 N
 warning
1 mm 2619 Gs
261.9 mT
 1.85 kg / 4.07 pounds
1846.6 g / 18.1 N
 low risk
2 mm 1818 Gs
181.8 mT
 0.89 kg / 1.96 pounds
889.8 g / 8.7 N
 low risk
3 mm 1279 Gs
127.9 mT
 0.44 kg / 0.97 pounds
440.2 g / 4.3 N
 low risk
5 mm 696 Gs
69.6 mT
 0.13 kg / 0.29 pounds
130.6 g / 1.3 N
 low risk
10 mm 225 Gs
22.5 mT
 0.01 kg / 0.03 pounds
13.6 g / 0.1 N
 low risk
15 mm 97 Gs
9.7 mT
 0.00 kg / 0.01 pounds
2.5 g / 0.0 N
 low risk
20 mm 49 Gs
4.9 mT
 0.00 kg / 0.00 pounds
0.6 g / 0.0 N
 low risk
30 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 low risk
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Grip strength drops drastically per each millimeter of distance. Keep in mind that every additional insulation layer (e.g., contamination, paint, rust) noticeably weakens the grip. Magnets operate most effectively at the point of direct contact; gap drastically cuts the power. Analyze how quickly the pull force drop, when the product does not touch tightly to the steel surface. When planning the mounting, eliminate redundant distances.

Table 2: Slippage 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 pounds
692.0 g / 6.8 N
1 mm Stal (~0.2) 0.37 kg / 0.82 pounds
370.0 g / 3.6 N
2 mm Stal (~0.2) 0.18 kg / 0.39 pounds
178.0 g / 1.7 N
3 mm Stal (~0.2) 0.09 kg / 0.19 pounds
88.0 g / 0.9 N
5 mm Stal (~0.2) 0.03 kg / 0.06 pounds
26.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data presents the theoretical shear load sufficient to cause the sliding of the magnet vertically on a vertical steel wall (assuming standard friction). This value varies with the air gap between the magnet and the metal.

Table 3: Vertical assembly (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 pounds
1038.0 g / 10.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.69 kg / 1.53 pounds
692.0 g / 6.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.35 kg / 0.76 pounds
346.0 g / 3.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.73 kg / 3.81 pounds
1730.0 g / 17.0 N
When placing a holder on a upright plane (e.g., a fridge), it will maintain barely about 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient influence the fact that products slip easier than they pop off the substrate. Want to create a vertical fastening? Consider that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the magnet will give way down under a noticeably lighter cargo. Utilizing a rubberized layer can effectively 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 pounds
346.0 g / 3.4 N
1 mm
25%
 0.87 kg / 1.91 pounds
865.0 g / 8.5 N
2 mm
50%
 1.73 kg / 3.81 pounds
1730.0 g / 17.0 N
3 mm
75%
 2.59 kg / 5.72 pounds
2595.0 g / 25.5 N
5 mm
100%
 3.46 kg / 7.63 pounds
3460.0 g / 33.9 N
10 mm
100%
 3.46 kg / 7.63 pounds
3460.0 g / 33.9 N
11 mm
100%
 3.46 kg / 7.63 pounds
3460.0 g / 33.9 N
12 mm
100%
 3.46 kg / 7.63 pounds
3460.0 g / 33.9 N
A thin metal plate is incapable of absorb the entire magnetic field, which squanders power of the magnet. 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 squeeze the maximum of this magnet's power, you need a suitably thick piece of metal. The saturation phenomenon causes that on sheet metal structures (e.g., car bodies), the product shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal stability (stability) - 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 pounds
3460.0 g / 33.9 N
 OK
40 °C -2.2% 3.38 kg / 7.46 pounds
3383.9 g / 33.2 N
 OK
60 °C -4.4% 3.31 kg / 7.29 pounds
3307.8 g / 32.4 N
80 °C -6.6% 3.23 kg / 7.12 pounds
3231.6 g / 31.7 N
100 °C -28.8% 2.46 kg / 5.43 pounds
2463.5 g / 24.2 N
Standard neodymium magnets change their properties parameters after exceeding the maximum temperature. Watch out for overheating – heat can permanently destroy this product. As the temperature rises, the magnet's capacity briefly drops. Avoid using this magnet close to ovens exceeding its safe range. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, but also on the magnet's shape. Low-profile magnets (pancake types) may lose charge permanently under lower heat stress compared to rod magnets. Warning indicator in the table points to a risk of irreversible loss for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 7.92 kg / 17.47 pounds
4 860 Gs
1.19 kg / 2.62 pounds
1189 g / 11.7 N
 N/A
1 mm 5.94 kg / 13.10 pounds
6 209 Gs
0.89 kg / 1.97 pounds
891 g / 8.7 N
 5.35 kg / 11.79 pounds
~0 Gs
2 mm 4.23 kg / 9.32 pounds
5 238 Gs
0.63 kg / 1.40 pounds
634 g / 6.2 N
 3.81 kg / 8.39 pounds
~0 Gs
3 mm 2.94 kg / 6.49 pounds
4 369 Gs
0.44 kg / 0.97 pounds
441 g / 4.3 N
 2.65 kg / 5.84 pounds
~0 Gs
5 mm 1.42 kg / 3.14 pounds
3 039 Gs
0.21 kg / 0.47 pounds
213 g / 2.1 N
 1.28 kg / 2.82 pounds
~0 Gs
10 mm 0.30 kg / 0.66 pounds
1 393 Gs
0.04 kg / 0.10 pounds
45 g / 0.4 N
 0.27 kg / 0.59 pounds
~0 Gs
20 mm 0.03 kg / 0.07 pounds
450 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
 0.03 kg / 0.06 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
56 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
34 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
23 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
16 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
11 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
8 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a wider radius than a magnet and sheet setup. The setup of magnet-to-magnet generates a stronger field and a wider radius of operation. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the impact force is extreme. The repulsion force is slightly lower than the attraction, but still significant.
*Flux density for N-N configuration reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Attention: Results demonstrate friction force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
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
Car key 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
Extremely neodym field is a real danger to IT equipment as well as pacemakers. These NdFeB products produce a flux that prevents correct functioning of digital equipment. Notice: the invisible magnetic field passes through tissues and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
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
Magnetic elements are prone to chipping – a violent impact against metal risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can trigger coating fragments or injury to skin. Be sure to control the product during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
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 passing through the magnet pole. Key data for generator designers as well as sensors. 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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Caution: On a vertical surface, the magnet retains just ~20% of its max power.

2. Plate thickness effect

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

3. Temperature resistance

*For N38 grade, 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

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
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%
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: 020131-2026
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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 20x5x3 mm and a weight of 2.25 g, guarantees premium class connection. As a block magnet with high power (approx. 3.46 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is shifting 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. Watch your fingers! Magnets with a force of 3.46 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. 3.46 kg), they are ideal as hidden locks 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 20x5x3 / N38, we recommend utilizing 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.
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. 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), 5 mm (width), and 3 mm (thickness). 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 Nd2Fe14B magnets.

Strengths

Apart from their strong magnetic energy, neodymium magnets have these key benefits:
  • Their magnetic field is durable, and after around ten years it decreases only by ~1% (theoretically),
  • They maintain their magnetic properties even under external field action,
  • A magnet with a smooth silver surface has better aesthetics,
  • Neodymium magnets create maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of individual machining and adjusting to specific needs,
  • Huge importance in modern industrial fields – they serve a role in HDD drives, electromotive mechanisms, medical devices, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in miniature devices

Limitations

Disadvantages of neodymium magnets:
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We recommend a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Maximum holding power of the magnet – what contributes to it?

The lifting capacity listed is a measurement result performed under the following configuration:
  • using a sheet made of low-carbon steel, acting as a ideal flux conductor
  • whose thickness equals approx. 10 mm
  • with a surface perfectly flat
  • with direct contact (without coatings)
  • during detachment in a direction vertical to the mounting surface
  • at temperature room level

Determinants of practical lifting force of a magnet

It is worth knowing that the application force will differ subject to the following factors, in order of importance:
  • Distance (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Smoothness – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity was measured with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Electronic hazard

Intense magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Threat to navigation

A strong magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Do not bring magnets close to a smartphone to prevent damaging the sensors.

Finger safety

Mind your fingers. Two large magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!

Implant safety

Individuals with a ICD should keep an absolute distance from magnets. The magnetic field can interfere with the functioning of the implant.

Product not for children

Strictly keep magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are fatal.

Do not drill into magnets

Fire warning: Neodymium dust is explosive. Do not process magnets in home conditions as this may cause fire.

Caution required

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

Do not overheat magnets

Control the heat. Exposing the magnet to high heat will ruin its magnetic structure and strength.

Sensitization to coating

Some people suffer from a sensitization to nickel, which is the common plating for NdFeB magnets. Extended handling can result in a rash. We recommend use safety gloves.

Magnet fragility

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

Security! Details about risks in the article: Magnet Safety Guide.