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
bulk discounts:
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Technical - 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 |
Engineering analysis of the product - data
These data represent the result of a engineering analysis. Values are based on models for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these calculations as a reference point during assembly planning.
Table 1: Static pull force (force vs gap) - interaction chart
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 pounds
42180.0 g / 413.8 N
|
dangerous! |
| 1 mm |
4452 Gs
445.2 mT
|
36.46 kg / 80.38 pounds
36461.5 g / 357.7 N
|
dangerous! |
| 2 mm |
4114 Gs
411.4 mT
|
31.13 kg / 68.62 pounds
31126.5 g / 305.4 N
|
dangerous! |
| 3 mm |
3784 Gs
378.4 mT
|
26.34 kg / 58.06 pounds
26336.3 g / 258.4 N
|
dangerous! |
| 5 mm |
3173 Gs
317.3 mT
|
18.52 kg / 40.84 pounds
18523.4 g / 181.7 N
|
dangerous! |
| 10 mm |
2022 Gs
202.2 mT
|
7.52 kg / 16.59 pounds
7522.9 g / 73.8 N
|
warning |
| 15 mm |
1324 Gs
132.4 mT
|
3.22 kg / 7.10 pounds
3222.6 g / 31.6 N
|
warning |
| 20 mm |
899 Gs
89.9 mT
|
1.49 kg / 3.28 pounds
1487.5 g / 14.6 N
|
safe |
| 30 mm |
458 Gs
45.8 mT
|
0.39 kg / 0.85 pounds
385.8 g / 3.8 N
|
safe |
| 50 mm |
159 Gs
15.9 mT
|
0.05 kg / 0.10 pounds
46.4 g / 0.5 N
|
safe |
Table 2: Slippage hold (wall)
MPL 50x20x20 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
8.44 kg / 18.60 pounds
8436.0 g / 82.8 N
|
| 1 mm | Stal (~0.2) |
7.29 kg / 16.08 pounds
7292.0 g / 71.5 N
|
| 2 mm | Stal (~0.2) |
6.23 kg / 13.73 pounds
6226.0 g / 61.1 N
|
| 3 mm | Stal (~0.2) |
5.27 kg / 11.61 pounds
5268.0 g / 51.7 N
|
| 5 mm | Stal (~0.2) |
3.70 kg / 8.17 pounds
3704.0 g / 36.3 N
|
| 10 mm | Stal (~0.2) |
1.50 kg / 3.32 pounds
1504.0 g / 14.8 N
|
| 15 mm | Stal (~0.2) |
0.64 kg / 1.42 pounds
644.0 g / 6.3 N
|
| 20 mm | Stal (~0.2) |
0.30 kg / 0.66 pounds
298.0 g / 2.9 N
|
| 30 mm | Stal (~0.2) |
0.08 kg / 0.17 pounds
78.0 g / 0.8 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
10.0 g / 0.1 N
|
Table 3: Wall mounting (shearing) - vertical pull
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 pounds
12654.0 g / 124.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
8.44 kg / 18.60 pounds
8436.0 g / 82.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.22 kg / 9.30 pounds
4218.0 g / 41.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
21.09 kg / 46.50 pounds
21090.0 g / 206.9 N
|
Table 4: Steel thickness (substrate influence) - power losses
MPL 50x20x20 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.11 kg / 4.65 pounds
2109.0 g / 20.7 N
|
| 1 mm |
|
5.27 kg / 11.62 pounds
5272.5 g / 51.7 N
|
| 2 mm |
|
10.55 kg / 23.25 pounds
10545.0 g / 103.4 N
|
| 3 mm |
|
15.82 kg / 34.87 pounds
15817.5 g / 155.2 N
|
| 5 mm |
|
26.36 kg / 58.12 pounds
26362.5 g / 258.6 N
|
| 10 mm |
|
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
|
| 11 mm |
|
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
|
| 12 mm |
|
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
|
Table 5: Working in heat (material behavior) - 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 pounds
42180.0 g / 413.8 N
|
OK |
| 40 °C | -2.2% |
41.25 kg / 90.95 pounds
41252.0 g / 404.7 N
|
OK |
| 60 °C | -4.4% |
40.32 kg / 88.90 pounds
40324.1 g / 395.6 N
|
OK |
| 80 °C | -6.6% |
39.40 kg / 86.85 pounds
39396.1 g / 386.5 N
|
|
| 100 °C | -28.8% |
30.03 kg / 66.21 pounds
30032.2 g / 294.6 N
|
Table 6: Two magnets (attraction) - forces in the system
MPL 50x20x20 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
141.37 kg / 311.66 pounds
5 687 Gs
|
21.21 kg / 46.75 pounds
21205 g / 208.0 N
|
N/A |
| 1 mm |
131.73 kg / 290.41 pounds
9 245 Gs
|
19.76 kg / 43.56 pounds
19759 g / 193.8 N
|
118.55 kg / 261.37 pounds
~0 Gs
|
| 2 mm |
122.20 kg / 269.41 pounds
8 904 Gs
|
18.33 kg / 40.41 pounds
18330 g / 179.8 N
|
109.98 kg / 242.47 pounds
~0 Gs
|
| 3 mm |
113.05 kg / 249.23 pounds
8 564 Gs
|
16.96 kg / 37.38 pounds
16957 g / 166.4 N
|
101.74 kg / 224.31 pounds
~0 Gs
|
| 5 mm |
96.05 kg / 211.76 pounds
7 894 Gs
|
14.41 kg / 31.76 pounds
14408 g / 141.3 N
|
86.45 kg / 190.58 pounds
~0 Gs
|
| 10 mm |
62.08 kg / 136.87 pounds
6 347 Gs
|
9.31 kg / 20.53 pounds
9312 g / 91.4 N
|
55.87 kg / 123.18 pounds
~0 Gs
|
| 20 mm |
25.21 kg / 55.59 pounds
4 045 Gs
|
3.78 kg / 8.34 pounds
3782 g / 37.1 N
|
22.69 kg / 50.03 pounds
~0 Gs
|
| 50 mm |
2.46 kg / 5.43 pounds
1 264 Gs
|
0.37 kg / 0.81 pounds
370 g / 3.6 N
|
2.22 kg / 4.89 pounds
~0 Gs
|
| 60 mm |
1.29 kg / 2.85 pounds
916 Gs
|
0.19 kg / 0.43 pounds
194 g / 1.9 N
|
1.16 kg / 2.57 pounds
~0 Gs
|
| 70 mm |
0.71 kg / 1.58 pounds
681 Gs
|
0.11 kg / 0.24 pounds
107 g / 1.1 N
|
0.64 kg / 1.42 pounds
~0 Gs
|
| 80 mm |
0.41 kg / 0.91 pounds
518 Gs
|
0.06 kg / 0.14 pounds
62 g / 0.6 N
|
0.37 kg / 0.82 pounds
~0 Gs
|
| 90 mm |
0.25 kg / 0.55 pounds
402 Gs
|
0.04 kg / 0.08 pounds
37 g / 0.4 N
|
0.22 kg / 0.49 pounds
~0 Gs
|
| 100 mm |
0.16 kg / 0.34 pounds
318 Gs
|
0.02 kg / 0.05 pounds
23 g / 0.2 N
|
0.14 kg / 0.31 pounds
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
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 |
| Mobile device | 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: Impact energy (kinetic energy) - 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: Anti-corrosion coating durability
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: Construction data (Pc)
MPL 50x20x20 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 46 654 Mx | 466.5 µWb |
| Pc Coefficient | 0.63 | High (Stable) |
Table 11: Submerged application
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. Wall mount (shear)
*Note: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.
3. Thermal stability
*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) = 0.63
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.
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 |
Check out also proposals
Advantages as well as disadvantages of Nd2Fe14B magnets.
Strengths
- They do not lose magnetism, even after around 10 years – the decrease in strength is only ~1% (based on measurements),
- They retain their magnetic properties even under close interference source,
- Thanks to the shiny finish, the layer of nickel, gold-plated, or silver gives an visually attractive appearance,
- They are known for high magnetic induction at the operating surface, which increases their power,
- Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of exact shaping as well as adjusting to individual applications,
- Fundamental importance in modern technologies – they serve a role in magnetic memories, electric motors, advanced medical instruments, and multitasking production systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- They are prone to damage upon heavy 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
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- Due to limitations in producing nuts and complex forms in magnets, we recommend using cover - magnetic holder.
- Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these devices 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
Magnetic strength at its maximum – what contributes to it?
- on a plate made of structural steel, optimally conducting the magnetic flux
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- characterized by even structure
- without the slightest air gap between the magnet and steel
- under vertical application of breakaway force (90-degree angle)
- at room temperature
Practical aspects of lifting capacity – factors
- Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
- Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
- Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
- Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the holding force.
Precautions when working with NdFeB magnets
Caution required
Handle with care. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can react.
Nickel allergy
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness appears, cease handling magnets and use protective gear.
Threat to electronics
Equipment safety: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, hearing aids, timepieces).
Product not for children
Only for adults. Small elements can be swallowed, leading to intestinal necrosis. Store out of reach of kids and pets.
Precision electronics
An intense magnetic field interferes with the functioning of compasses in phones and GPS navigation. Keep magnets near a smartphone to avoid damaging the sensors.
Health Danger
For implant holders: Powerful magnets affect electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.
Heat warning
Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. This process is irreversible.
Dust explosion hazard
Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Risk of cracking
Beware of splinters. Magnets can fracture upon violent connection, ejecting shards into the air. We recommend safety glasses.
Hand protection
Protect your hands. Two large magnets will join instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!
