MPL 50x20x20 / N38 - lamellar magnet
lamellar magnet
Catalog no 020166
GTIN/EAN: 5906301811725
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
150 g
Magnetization Direction
↑ axial
Load capacity
42.18 kg / 413.81 N
Magnetic Induction
478.99 mT / 4790 Gs
Coating
[NiCuNi] Nickel
47.32 ZŁ with VAT / pcs + price for transport
38.47 ZŁ net + 23% VAT / pcs
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Product card - MPL 50x20x20 / N38 - lamellar magnet
Specification / characteristics - MPL 50x20x20 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020166 |
| GTIN/EAN | 5906301811725 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 50 mm [±0,1 mm] |
| Width | 20 mm [±0,1 mm] |
| Height | 20 mm [±0,1 mm] |
| Weight | 150 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 42.18 kg / 413.81 N |
| Magnetic Induction ~ ? | 478.99 mT / 4790 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| 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
| 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 simulation of the assembly - data
The following values represent the outcome of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Use these calculations as a reference point during assembly planning.
Table 1: Static pull force (force vs distance) - power drop
MPL 50x20x20 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4789 Gs
478.9 mT
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
critical level |
| 1 mm |
4452 Gs
445.2 mT
|
36.46 kg / 80.38 LBS
36461.5 g / 357.7 N
|
critical level |
| 2 mm |
4114 Gs
411.4 mT
|
31.13 kg / 68.62 LBS
31126.5 g / 305.4 N
|
critical level |
| 3 mm |
3784 Gs
378.4 mT
|
26.34 kg / 58.06 LBS
26336.3 g / 258.4 N
|
critical level |
| 5 mm |
3173 Gs
317.3 mT
|
18.52 kg / 40.84 LBS
18523.4 g / 181.7 N
|
critical level |
| 10 mm |
2022 Gs
202.2 mT
|
7.52 kg / 16.59 LBS
7522.9 g / 73.8 N
|
strong |
| 15 mm |
1324 Gs
132.4 mT
|
3.22 kg / 7.10 LBS
3222.6 g / 31.6 N
|
strong |
| 20 mm |
899 Gs
89.9 mT
|
1.49 kg / 3.28 LBS
1487.5 g / 14.6 N
|
safe |
| 30 mm |
458 Gs
45.8 mT
|
0.39 kg / 0.85 LBS
385.8 g / 3.8 N
|
safe |
| 50 mm |
159 Gs
15.9 mT
|
0.05 kg / 0.10 LBS
46.4 g / 0.5 N
|
safe |
Table 2: Shear load (vertical surface)
MPL 50x20x20 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
8.44 kg / 18.60 LBS
8436.0 g / 82.8 N
|
| 1 mm | Stal (~0.2) |
7.29 kg / 16.08 LBS
7292.0 g / 71.5 N
|
| 2 mm | Stal (~0.2) |
6.23 kg / 13.73 LBS
6226.0 g / 61.1 N
|
| 3 mm | Stal (~0.2) |
5.27 kg / 11.61 LBS
5268.0 g / 51.7 N
|
| 5 mm | Stal (~0.2) |
3.70 kg / 8.17 LBS
3704.0 g / 36.3 N
|
| 10 mm | Stal (~0.2) |
1.50 kg / 3.32 LBS
1504.0 g / 14.8 N
|
| 15 mm | Stal (~0.2) |
0.64 kg / 1.42 LBS
644.0 g / 6.3 N
|
| 20 mm | Stal (~0.2) |
0.30 kg / 0.66 LBS
298.0 g / 2.9 N
|
| 30 mm | Stal (~0.2) |
0.08 kg / 0.17 LBS
78.0 g / 0.8 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 LBS
10.0 g / 0.1 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x20x20 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
12.65 kg / 27.90 LBS
12654.0 g / 124.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
8.44 kg / 18.60 LBS
8436.0 g / 82.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.22 kg / 9.30 LBS
4218.0 g / 41.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
21.09 kg / 46.50 LBS
21090.0 g / 206.9 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 50x20x20 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.11 kg / 4.65 LBS
2109.0 g / 20.7 N
|
| 1 mm |
|
5.27 kg / 11.62 LBS
5272.5 g / 51.7 N
|
| 2 mm |
|
10.55 kg / 23.25 LBS
10545.0 g / 103.4 N
|
| 3 mm |
|
15.82 kg / 34.87 LBS
15817.5 g / 155.2 N
|
| 5 mm |
|
26.36 kg / 58.12 LBS
26362.5 g / 258.6 N
|
| 10 mm |
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
| 11 mm |
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
| 12 mm |
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
Table 5: Working in heat (stability) - resistance threshold
MPL 50x20x20 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
OK |
| 40 °C | -2.2% |
41.25 kg / 90.95 LBS
41252.0 g / 404.7 N
|
OK |
| 60 °C | -4.4% |
40.32 kg / 88.90 LBS
40324.1 g / 395.6 N
|
OK |
| 80 °C | -6.6% |
39.40 kg / 86.85 LBS
39396.1 g / 386.5 N
|
|
| 100 °C | -28.8% |
30.03 kg / 66.21 LBS
30032.2 g / 294.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 50x20x20 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
141.37 kg / 311.66 LBS
5 687 Gs
|
21.21 kg / 46.75 LBS
21205 g / 208.0 N
|
N/A |
| 1 mm |
131.73 kg / 290.41 LBS
9 245 Gs
|
19.76 kg / 43.56 LBS
19759 g / 193.8 N
|
118.55 kg / 261.37 LBS
~0 Gs
|
| 2 mm |
122.20 kg / 269.41 LBS
8 904 Gs
|
18.33 kg / 40.41 LBS
18330 g / 179.8 N
|
109.98 kg / 242.47 LBS
~0 Gs
|
| 3 mm |
113.05 kg / 249.23 LBS
8 564 Gs
|
16.96 kg / 37.38 LBS
16957 g / 166.4 N
|
101.74 kg / 224.31 LBS
~0 Gs
|
| 5 mm |
96.05 kg / 211.76 LBS
7 894 Gs
|
14.41 kg / 31.76 LBS
14408 g / 141.3 N
|
86.45 kg / 190.58 LBS
~0 Gs
|
| 10 mm |
62.08 kg / 136.87 LBS
6 347 Gs
|
9.31 kg / 20.53 LBS
9312 g / 91.4 N
|
55.87 kg / 123.18 LBS
~0 Gs
|
| 20 mm |
25.21 kg / 55.59 LBS
4 045 Gs
|
3.78 kg / 8.34 LBS
3782 g / 37.1 N
|
22.69 kg / 50.03 LBS
~0 Gs
|
| 50 mm |
2.46 kg / 5.43 LBS
1 264 Gs
|
0.37 kg / 0.81 LBS
370 g / 3.6 N
|
2.22 kg / 4.89 LBS
~0 Gs
|
| 60 mm |
1.29 kg / 2.85 LBS
916 Gs
|
0.19 kg / 0.43 LBS
194 g / 1.9 N
|
1.16 kg / 2.57 LBS
~0 Gs
|
| 70 mm |
0.71 kg / 1.58 LBS
681 Gs
|
0.11 kg / 0.24 LBS
107 g / 1.1 N
|
0.64 kg / 1.42 LBS
~0 Gs
|
| 80 mm |
0.41 kg / 0.91 LBS
518 Gs
|
0.06 kg / 0.14 LBS
62 g / 0.6 N
|
0.37 kg / 0.82 LBS
~0 Gs
|
| 90 mm |
0.25 kg / 0.55 LBS
402 Gs
|
0.04 kg / 0.08 LBS
37 g / 0.4 N
|
0.22 kg / 0.49 LBS
~0 Gs
|
| 100 mm |
0.16 kg / 0.34 LBS
318 Gs
|
0.02 kg / 0.05 LBS
23 g / 0.2 N
|
0.14 kg / 0.31 LBS
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MPL 50x20x20 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 19.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 15.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 11.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 9.0 cm |
| Remote | 50 Gs (5.0 mT) | 8.5 cm |
| Payment card | 400 Gs (40.0 mT) | 3.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Dynamics (cracking risk) - warning
MPL 50x20x20 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
18.70 km/h
(5.20 m/s)
|
2.02 J | |
| 30 mm |
29.46 km/h
(8.18 m/s)
|
5.02 J | |
| 50 mm |
37.84 km/h
(10.51 m/s)
|
8.29 J | |
| 100 mm |
53.48 km/h
(14.86 m/s)
|
16.55 J |
Table 9: Corrosion resistance
MPL 50x20x20 / 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 50x20x20 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 46 654 Mx | 466.5 µWb |
| Pc Coefficient | 0.63 | High (Stable) |
Table 11: Physics of underwater searching
MPL 50x20x20 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 42.18 kg | Standard |
| Water (riverbed) |
48.30 kg
(+6.12 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical surface, the magnet holds only approx. 20-30% of its max power.
2. Steel saturation
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Heat tolerance
*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) = 0.63
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.
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 |
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Advantages and disadvantages of Nd2Fe14B magnets.
Benefits
- Their strength is durable, and after around 10 years it decreases only by ~1% (according to research),
- Magnets very well resist against loss of magnetization caused by external fields,
- Thanks to the shiny finish, the layer of Ni-Cu-Ni, gold-plated, or silver-plated gives an clean appearance,
- The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
- Thanks to versatility in designing and the ability to modify to complex applications,
- Fundamental importance in electronics industry – they are utilized in mass storage devices, drive modules, precision medical tools, as well as technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in small systems
Disadvantages
- They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
- NdFeB 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
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- Limited possibility of making threads in the magnet and complicated forms - preferred is casing - mounting mechanism.
- Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets can complicate diagnosis medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Maximum lifting capacity of the magnet – what it depends on?
- with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
- whose thickness reaches at least 10 mm
- characterized by smoothness
- without the slightest air gap between the magnet and steel
- during pulling in a direction perpendicular to the plane
- at ambient temperature room level
Key elements affecting lifting force
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Metal type – not every steel attracts identically. High carbon content worsen the attraction effect.
- Surface quality – the more even the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).
Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet and the plate decreases the holding force.
Safety rules for work with NdFeB magnets
Life threat
Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.
Nickel allergy
Certain individuals have a contact allergy to Ni, which is the common plating for NdFeB magnets. Prolonged contact can result in skin redness. We strongly advise use protective gloves.
Do not give to children
These products are not intended for children. Eating multiple magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates immediate surgery.
Hand protection
Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!
GPS and phone interference
A strong magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Maintain magnets near a smartphone to avoid breaking the sensors.
Fire warning
Dust produced during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Operating temperature
Do not overheat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, look for HT versions (H, SH, UH).
Eye protection
Beware of splinters. Magnets can explode upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.
Keep away from computers
Avoid bringing magnets close to a wallet, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Powerful field
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.
