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MPL 20x5x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020132

GTIN/EAN: 5906301811381

5.00

length

20 mm [±0,1 mm]

Width

5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

3.75 g

Magnetization Direction

↑ axial

Load capacity

4.42 kg / 43.32 N

Magnetic Induction

456.78 mT / 4568 Gs

Coating

[NiCuNi] Nickel

2.76 with VAT / pcs + price for transport

2.24 ZŁ net + 23% VAT / pcs

bulk discounts:

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Product card - MPL 20x5x5 / N38 - lamellar magnet

Specification / characteristics - MPL 20x5x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020132
GTIN/EAN 5906301811381
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 5 mm [±0,1 mm]
Weight 3.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.42 kg / 43.32 N
Magnetic Induction ~ ? 456.78 mT / 4568 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x5x5 / 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 modeling of the magnet - technical parameters

Presented information represent the outcome of a engineering simulation. Results are based on models for the material Nd2Fe14B. Actual parameters may deviate from the simulation results. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs distance) - interaction chart
MPL 20x5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4563 Gs
456.3 mT
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
strong
1 mm 3323 Gs
332.3 mT
2.34 kg / 5.17 pounds
2344.7 g / 23.0 N
strong
2 mm 2341 Gs
234.1 mT
1.16 kg / 2.56 pounds
1163.0 g / 11.4 N
low risk
3 mm 1678 Gs
167.8 mT
0.60 kg / 1.32 pounds
597.4 g / 5.9 N
low risk
5 mm 944 Gs
94.4 mT
0.19 kg / 0.42 pounds
189.2 g / 1.9 N
low risk
10 mm 320 Gs
32.0 mT
0.02 kg / 0.05 pounds
21.7 g / 0.2 N
low risk
15 mm 141 Gs
14.1 mT
0.00 kg / 0.01 pounds
4.2 g / 0.0 N
low risk
20 mm 73 Gs
7.3 mT
0.00 kg / 0.00 pounds
1.1 g / 0.0 N
low risk
30 mm 26 Gs
2.6 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
low risk
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk

Table 2: Slippage force (vertical surface)
MPL 20x5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.88 kg / 1.95 pounds
884.0 g / 8.7 N
1 mm Stal (~0.2) 0.47 kg / 1.03 pounds
468.0 g / 4.6 N
2 mm Stal (~0.2) 0.23 kg / 0.51 pounds
232.0 g / 2.3 N
3 mm Stal (~0.2) 0.12 kg / 0.26 pounds
120.0 g / 1.2 N
5 mm Stal (~0.2) 0.04 kg / 0.08 pounds
38.0 g / 0.4 N
10 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 20x5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.33 kg / 2.92 pounds
1326.0 g / 13.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.88 kg / 1.95 pounds
884.0 g / 8.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.44 kg / 0.97 pounds
442.0 g / 4.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.21 kg / 4.87 pounds
2210.0 g / 21.7 N

Table 4: Material efficiency (saturation) - power losses
MPL 20x5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.44 kg / 0.97 pounds
442.0 g / 4.3 N
1 mm
25%
1.11 kg / 2.44 pounds
1105.0 g / 10.8 N
2 mm
50%
2.21 kg / 4.87 pounds
2210.0 g / 21.7 N
3 mm
75%
3.32 kg / 7.31 pounds
3315.0 g / 32.5 N
5 mm
100%
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
10 mm
100%
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
11 mm
100%
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
12 mm
100%
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N

Table 5: Thermal stability (stability) - resistance threshold
MPL 20x5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
OK
40 °C -2.2% 4.32 kg / 9.53 pounds
4322.8 g / 42.4 N
OK
60 °C -4.4% 4.23 kg / 9.32 pounds
4225.5 g / 41.5 N
80 °C -6.6% 4.13 kg / 9.10 pounds
4128.3 g / 40.5 N
100 °C -28.8% 3.15 kg / 6.94 pounds
3147.0 g / 30.9 N

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 20x5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.84 kg / 28.30 pounds
5 504 Gs
1.93 kg / 4.24 pounds
1925 g / 18.9 N
N/A
1 mm 9.53 kg / 21.01 pounds
7 864 Gs
1.43 kg / 3.15 pounds
1430 g / 14.0 N
8.58 kg / 18.91 pounds
~0 Gs
2 mm 6.81 kg / 15.01 pounds
6 647 Gs
1.02 kg / 2.25 pounds
1021 g / 10.0 N
6.13 kg / 13.51 pounds
~0 Gs
3 mm 4.79 kg / 10.57 pounds
5 577 Gs
0.72 kg / 1.59 pounds
719 g / 7.1 N
4.31 kg / 9.51 pounds
~0 Gs
5 mm 2.40 kg / 5.30 pounds
3 949 Gs
0.36 kg / 0.79 pounds
360 g / 3.5 N
2.16 kg / 4.77 pounds
~0 Gs
10 mm 0.55 kg / 1.21 pounds
1 888 Gs
0.08 kg / 0.18 pounds
82 g / 0.8 N
0.49 kg / 1.09 pounds
~0 Gs
20 mm 0.06 kg / 0.14 pounds
640 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
0.06 kg / 0.13 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
84 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
53 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
35 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
24 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
18 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
13 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 20x5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Mobile device 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Dynamics (cracking risk) - collision effects
MPL 20x5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 34.73 km/h
(9.65 m/s)
0.17 J
30 mm 59.97 km/h
(16.66 m/s)
0.52 J
50 mm 77.42 km/h
(21.51 m/s)
0.87 J
100 mm 109.49 km/h
(30.41 m/s)
1.73 J

Table 9: Surface protection spec
MPL 20x5x5 / 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)

Table 10: Electrical data (Flux)
MPL 20x5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 204 Mx 42.0 µWb
Pc Coefficient 0.54 Low (Flat)

Table 11: Submerged application
MPL 20x5x5 / N38

Environment Effective steel pull Effect
Air (land) 4.42 kg Standard
Water (riverbed) 5.06 kg
(+0.64 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!
1. Shear force

*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For N38 material, the max working temp is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.54

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: 020132-2026
Magnet Unit Converter
Force (pull)

Magnetic Induction

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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 20x5x5 mm and a weight of 3.75 g, guarantees premium class connection. This magnetic block with a force of 43.32 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
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. To separate the MPL 20x5x5 / 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.
Plate magnets MPL 20x5x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 4.42 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 20x5x5 / N38, we recommend utilizing two-component adhesives (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).
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.
This model is characterized by dimensions 20x5x5 mm, which, at a weight of 3.75 g, makes it an element with high energy density. It is a magnetic block with dimensions 20x5x5 mm and a self-weight of 3.75 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of neodymium magnets.

Advantages

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They do not lose power, even over approximately ten years – the drop in lifting capacity is only ~1% (according to tests),
  • Neodymium magnets are remarkably resistant to demagnetization caused by magnetic disturbances,
  • In other words, due to the metallic layer of gold, the element becomes visually attractive,
  • Magnets exhibit huge magnetic induction on the outer layer,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Due to the potential of free shaping and customization to specialized projects, neodymium magnets can be modeled in a wide range of forms and dimensions, which makes them more universal,
  • Wide application in high-tech industry – they find application in data components, electromotive mechanisms, medical devices, as well as technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of neodymium magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited ability of making threads in the magnet and complex shapes - recommended is cover - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Best holding force of the magnet in ideal parameterswhat it depends on?

The load parameter shown concerns the peak performance, recorded under ideal test conditions, meaning:
  • on a base made of mild steel, effectively closing the magnetic field
  • with a cross-section minimum 10 mm
  • with an ground touching surface
  • with direct contact (no impurities)
  • under perpendicular force vector (90-degree angle)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual lifting capacity results from several key aspects, presented from most significant:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Alloy steels lower magnetic permeability and lifting capacity.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate lowers the holding force.

H&S for magnets
Medical implants

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

Crushing risk

Watch your fingers. Two powerful magnets will snap together immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Magnet fragility

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets leads to them breaking into small pieces.

Keep away from electronics

A strong magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Do not bring magnets close to a device to prevent breaking the sensors.

Thermal limits

Keep cool. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Avoid contact if allergic

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness occurs, cease working with magnets and use protective gear.

Electronic hazard

Equipment safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, timepieces).

Safe operation

Use magnets consciously. Their huge power can shock even professionals. Be vigilant and do not underestimate their force.

Danger to the youngest

These products are not toys. Eating several magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.

Combustion hazard

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

Warning! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98