MPL 50x20x5 / N38 - lamellar magnet
lamellar magnet
Catalog no 020473
GTIN/EAN: 5906301811930
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
37.5 g
Magnetization Direction
↑ axial
Load capacity
12.69 kg / 124.48 N
Magnetic Induction
197.73 mT / 1977 Gs
Coating
[NiCuNi] Nickel
14.56 ZŁ with VAT / pcs + price for transport
11.84 ZŁ net + 23% VAT / pcs
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Detailed specification - MPL 50x20x5 / N38 - lamellar magnet
Specification / characteristics - MPL 50x20x5 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020473 |
| GTIN/EAN | 5906301811930 |
| 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 | 5 mm [±0,1 mm] |
| Weight | 37.5 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 12.69 kg / 124.48 N |
| Magnetic Induction ~ ? | 197.73 mT / 1977 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 |
Physical simulation of the magnet - technical parameters
The following information represent the result of a mathematical calculation. Results are based on models for the class Nd2Fe14B. Real-world performance might slightly differ. Treat these data as a supplementary guide when designing systems.
Table 1: Static force (force vs distance) - power drop
MPL 50x20x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1977 Gs
197.7 mT
|
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
|
crushing |
| 1 mm |
1885 Gs
188.5 mT
|
11.53 kg / 25.42 lbs
11530.3 g / 113.1 N
|
crushing |
| 2 mm |
1772 Gs
177.2 mT
|
10.20 kg / 22.49 lbs
10199.9 g / 100.1 N
|
crushing |
| 3 mm |
1649 Gs
164.9 mT
|
8.83 kg / 19.47 lbs
8831.3 g / 86.6 N
|
strong |
| 5 mm |
1395 Gs
139.5 mT
|
6.32 kg / 13.93 lbs
6320.3 g / 62.0 N
|
strong |
| 10 mm |
870 Gs
87.0 mT
|
2.46 kg / 5.42 lbs
2459.4 g / 24.1 N
|
strong |
| 15 mm |
549 Gs
54.9 mT
|
0.98 kg / 2.15 lbs
976.9 g / 9.6 N
|
low risk |
| 20 mm |
359 Gs
35.9 mT
|
0.42 kg / 0.92 lbs
418.9 g / 4.1 N
|
low risk |
| 30 mm |
172 Gs
17.2 mT
|
0.10 kg / 0.21 lbs
95.7 g / 0.9 N
|
low risk |
| 50 mm |
54 Gs
5.4 mT
|
0.01 kg / 0.02 lbs
9.5 g / 0.1 N
|
low risk |
Table 2: Shear hold (vertical surface)
MPL 50x20x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.54 kg / 5.60 lbs
2538.0 g / 24.9 N
|
| 1 mm | Stal (~0.2) |
2.31 kg / 5.08 lbs
2306.0 g / 22.6 N
|
| 2 mm | Stal (~0.2) |
2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
|
| 3 mm | Stal (~0.2) |
1.77 kg / 3.89 lbs
1766.0 g / 17.3 N
|
| 5 mm | Stal (~0.2) |
1.26 kg / 2.79 lbs
1264.0 g / 12.4 N
|
| 10 mm | Stal (~0.2) |
0.49 kg / 1.08 lbs
492.0 g / 4.8 N
|
| 15 mm | Stal (~0.2) |
0.20 kg / 0.43 lbs
196.0 g / 1.9 N
|
| 20 mm | Stal (~0.2) |
0.08 kg / 0.19 lbs
84.0 g / 0.8 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
20.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 50x20x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
3.81 kg / 8.39 lbs
3807.0 g / 37.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.54 kg / 5.60 lbs
2538.0 g / 24.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.27 kg / 2.80 lbs
1269.0 g / 12.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
6.35 kg / 13.99 lbs
6345.0 g / 62.2 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 50x20x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.63 kg / 1.40 lbs
634.5 g / 6.2 N
|
| 1 mm |
|
1.59 kg / 3.50 lbs
1586.3 g / 15.6 N
|
| 2 mm |
|
3.17 kg / 6.99 lbs
3172.5 g / 31.1 N
|
| 3 mm |
|
4.76 kg / 10.49 lbs
4758.8 g / 46.7 N
|
| 5 mm |
|
7.93 kg / 17.49 lbs
7931.2 g / 77.8 N
|
| 10 mm |
|
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
|
| 11 mm |
|
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
|
| 12 mm |
|
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
|
Table 5: Thermal resistance (stability) - thermal limit
MPL 50x20x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
|
OK |
| 40 °C | -2.2% |
12.41 kg / 27.36 lbs
12410.8 g / 121.8 N
|
OK |
| 60 °C | -4.4% |
12.13 kg / 26.75 lbs
12131.6 g / 119.0 N
|
|
| 80 °C | -6.6% |
11.85 kg / 26.13 lbs
11852.5 g / 116.3 N
|
|
| 100 °C | -28.8% |
9.04 kg / 19.92 lbs
9035.3 g / 88.6 N
|
Table 6: Two magnets (attraction) - field collision
MPL 50x20x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
24.10 kg / 53.12 lbs
3 371 Gs
|
3.61 kg / 7.97 lbs
3614 g / 35.5 N
|
N/A |
| 1 mm |
23.06 kg / 50.84 lbs
3 868 Gs
|
3.46 kg / 7.63 lbs
3459 g / 33.9 N
|
20.75 kg / 45.75 lbs
~0 Gs
|
| 2 mm |
21.89 kg / 48.27 lbs
3 769 Gs
|
3.28 kg / 7.24 lbs
3284 g / 32.2 N
|
19.71 kg / 43.44 lbs
~0 Gs
|
| 3 mm |
20.65 kg / 45.53 lbs
3 661 Gs
|
3.10 kg / 6.83 lbs
3098 g / 30.4 N
|
18.59 kg / 40.98 lbs
~0 Gs
|
| 5 mm |
18.07 kg / 39.83 lbs
3 424 Gs
|
2.71 kg / 5.97 lbs
2710 g / 26.6 N
|
16.26 kg / 35.84 lbs
~0 Gs
|
| 10 mm |
12.00 kg / 26.46 lbs
2 790 Gs
|
1.80 kg / 3.97 lbs
1800 g / 17.7 N
|
10.80 kg / 23.81 lbs
~0 Gs
|
| 20 mm |
4.67 kg / 10.30 lbs
1 741 Gs
|
0.70 kg / 1.54 lbs
701 g / 6.9 N
|
4.20 kg / 9.27 lbs
~0 Gs
|
| 50 mm |
0.37 kg / 0.81 lbs
488 Gs
|
0.06 kg / 0.12 lbs
55 g / 0.5 N
|
0.33 kg / 0.73 lbs
~0 Gs
|
| 60 mm |
0.18 kg / 0.40 lbs
343 Gs
|
0.03 kg / 0.06 lbs
27 g / 0.3 N
|
0.16 kg / 0.36 lbs
~0 Gs
|
| 70 mm |
0.10 kg / 0.21 lbs
248 Gs
|
0.01 kg / 0.03 lbs
14 g / 0.1 N
|
0.09 kg / 0.19 lbs
~0 Gs
|
| 80 mm |
0.05 kg / 0.12 lbs
184 Gs
|
0.01 kg / 0.02 lbs
8 g / 0.1 N
|
0.05 kg / 0.10 lbs
~0 Gs
|
| 90 mm |
0.03 kg / 0.07 lbs
140 Gs
|
0.00 kg / 0.01 lbs
5 g / 0.0 N
|
0.03 kg / 0.06 lbs
~0 Gs
|
| 100 mm |
0.02 kg / 0.04 lbs
108 Gs
|
0.00 kg / 0.01 lbs
3 g / 0.0 N
|
0.02 kg / 0.04 lbs
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MPL 50x20x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 12.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 9.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 7.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 6.0 cm |
| Remote | 50 Gs (5.0 mT) | 5.5 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Impact energy (kinetic energy) - warning
MPL 50x20x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.68 km/h
(5.74 m/s)
|
0.62 J | |
| 30 mm |
32.28 km/h
(8.97 m/s)
|
1.51 J | |
| 50 mm |
41.50 km/h
(11.53 m/s)
|
2.49 J | |
| 100 mm |
58.67 km/h
(16.30 m/s)
|
4.98 J |
Table 9: Surface protection spec
MPL 50x20x5 / 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 (Pc)
MPL 50x20x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 20 792 Mx | 207.9 µWb |
| Pc Coefficient | 0.21 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 50x20x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 12.69 kg | Standard |
| Water (riverbed) |
14.53 kg
(+1.84 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical wall, the magnet holds merely ~20% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) significantly 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) = 0.21
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Advantages and disadvantages of neodymium magnets.
Benefits
- Their strength is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
- They are noted for resistance to demagnetization induced by external magnetic fields,
- In other words, due to the smooth finish of silver, the element becomes visually attractive,
- Magnets have extremely high magnetic induction on the working surface,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Due to the option of precise forming and adaptation to individualized projects, magnetic components can be manufactured in a wide range of forms and dimensions, which makes them more universal,
- Huge importance in electronics industry – they are used in data components, electromotive mechanisms, advanced medical instruments, and multitasking production systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as 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 suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
- Limited possibility of creating nuts in the magnet and complicated shapes - preferred is a housing - magnetic holder.
- Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical after entering the body.
- With budget limitations the cost of neodymium magnets is a challenge,
Lifting parameters
Magnetic strength at its maximum – what affects it?
- using a base made of low-carbon steel, functioning as a circuit closing element
- whose thickness equals approx. 10 mm
- with an polished contact surface
- with zero gap (without impurities)
- for force applied at a right angle (in the magnet axis)
- at standard ambient temperature
Key elements affecting lifting force
- Gap (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
- Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
- Steel thickness – too thin steel causes magnetic saturation, causing part of the flux to be escaped to the other side.
- Plate material – low-carbon steel gives the best results. Higher carbon content decrease magnetic permeability and holding force.
- Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.
Precautions when working with neodymium magnets
GPS Danger
An intense magnetic field disrupts the functioning of magnetometers in phones and GPS navigation. Keep magnets close to a device to prevent damaging the sensors.
Warning for allergy sufferers
It is widely known that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands or select encased magnets.
Product not for children
Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are life-threatening.
Operating temperature
Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.
Health Danger
For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.
Safe operation
Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.
Do not drill into magnets
Mechanical processing of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Magnet fragility
Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them breaking into shards.
Serious injuries
Large magnets can break fingers instantly. Never put your hand between two attracting surfaces.
Electronic devices
Device Safety: Strong magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).
