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 parameters - 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 modeling of the product - report
These values are the direct effect of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Real-world parameters may differ. Treat these calculations as a preliminary roadmap for designers.
Table 1: Static pull force (force vs gap) - 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 pounds
42180.0 g / 413.8 N
|
crushing |
| 1 mm |
4452 Gs
445.2 mT
|
36.46 kg / 80.38 pounds
36461.5 g / 357.7 N
|
crushing |
| 2 mm |
4114 Gs
411.4 mT
|
31.13 kg / 68.62 pounds
31126.5 g / 305.4 N
|
crushing |
| 3 mm |
3784 Gs
378.4 mT
|
26.34 kg / 58.06 pounds
26336.3 g / 258.4 N
|
crushing |
| 5 mm |
3173 Gs
317.3 mT
|
18.52 kg / 40.84 pounds
18523.4 g / 181.7 N
|
crushing |
| 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
|
weak grip |
| 30 mm |
458 Gs
45.8 mT
|
0.39 kg / 0.85 pounds
385.8 g / 3.8 N
|
weak grip |
| 50 mm |
159 Gs
15.9 mT
|
0.05 kg / 0.10 pounds
46.4 g / 0.5 N
|
weak grip |
Table 2: Slippage force (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 (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 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: Material efficiency (saturation) - 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) - field range
MPL 50x20x20 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral 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: Safety (HSE) (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 |
| Mechanical watch | 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: Collisions (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: Construction 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: Hydrostatics and buoyancy
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
*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Temperature resistance
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.63
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.
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 |
Check out also proposals
Pros and cons of Nd2Fe14B magnets.
Benefits
- They retain full power for around ten years – the loss is just ~1% (according to analyses),
- They are resistant to demagnetization induced by external magnetic fields,
- The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to present itself better,
- Magnetic induction on the surface of the magnet is impressive,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to versatility in forming and the capacity to adapt to unusual requirements,
- Huge importance in electronics industry – they are utilized in hard drives, electromotive mechanisms, medical devices, as well as other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in small systems
Limitations
- At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
- Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Maximum magnetic pulling force – what it depends on?
- on a block made of structural steel, optimally conducting the magnetic field
- whose thickness is min. 10 mm
- with an ground touching surface
- under conditions of ideal adhesion (surface-to-surface)
- for force acting at a right angle (in the magnet axis)
- at temperature room level
What influences lifting capacity in practice
- Distance – existence of any layer (rust, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
- Direction of force – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
- Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Metal type – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
- Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
- Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the holding force.
H&S for magnets
Cards and drives
Device Safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).
Risk of cracking
Protect your eyes. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.
Adults only
NdFeB magnets are not suitable for play. Swallowing a few magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates urgent medical intervention.
Handling guide
Handle magnets consciously. Their immense force can shock even experienced users. Be vigilant and do not underestimate their force.
Hand protection
Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!
Dust is flammable
Powder generated during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Threat to navigation
Remember: neodymium magnets produce a field that disrupts precision electronics. Maintain a safe distance from your mobile, device, and navigation systems.
Demagnetization risk
Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. This process is irreversible.
Medical implants
For implant holders: Powerful magnets disrupt electronics. Keep at least 30 cm distance or ask another person to work with the magnets.
Sensitization to coating
Certain individuals experience a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Extended handling might lead to a rash. We recommend wear safety gloves.
