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
bulk discounts:
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Technical data of the product - 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 product - report
These data are the result of a mathematical calculation. Results rely on models for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these calculations as a reference point during assembly planning.
Table 1: Static force (pull vs gap) - interaction chart
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
|
dangerous! |
| 1 mm |
1885 Gs
188.5 mT
|
11.53 kg / 25.42 LBS
11530.3 g / 113.1 N
|
dangerous! |
| 2 mm |
1772 Gs
177.2 mT
|
10.20 kg / 22.49 LBS
10199.9 g / 100.1 N
|
dangerous! |
| 3 mm |
1649 Gs
164.9 mT
|
8.83 kg / 19.47 LBS
8831.3 g / 86.6 N
|
warning |
| 5 mm |
1395 Gs
139.5 mT
|
6.32 kg / 13.93 LBS
6320.3 g / 62.0 N
|
warning |
| 10 mm |
870 Gs
87.0 mT
|
2.46 kg / 5.42 LBS
2459.4 g / 24.1 N
|
warning |
| 15 mm |
549 Gs
54.9 mT
|
0.98 kg / 2.15 LBS
976.9 g / 9.6 N
|
weak grip |
| 20 mm |
359 Gs
35.9 mT
|
0.42 kg / 0.92 LBS
418.9 g / 4.1 N
|
weak grip |
| 30 mm |
172 Gs
17.2 mT
|
0.10 kg / 0.21 LBS
95.7 g / 0.9 N
|
weak grip |
| 50 mm |
54 Gs
5.4 mT
|
0.01 kg / 0.02 LBS
9.5 g / 0.1 N
|
weak grip |
Table 2: Sliding 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: Vertical assembly (sliding) - 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) - sheet metal selection
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 stability (material behavior) - power drop
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) - forces in the system
MPL 50x20x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (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) - warnings
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: Collisions (kinetic energy) - collision effects
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: Anti-corrosion coating durability
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: Construction data (Flux)
MPL 50x20x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 20 792 Mx | 207.9 µWb |
| Pc Coefficient | 0.21 | Low (Flat) |
Table 11: Submerged application
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. Sliding resistance
*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.
2. Efficiency vs thickness
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Power loss vs temp
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.21
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 |
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Strengths and weaknesses of neodymium magnets.
Pros
- They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
- Magnets effectively protect themselves against loss of magnetization caused by foreign field sources,
- In other words, due to the shiny surface of silver, the element gains visual value,
- The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
- Thanks to flexibility in constructing and the ability to adapt to client solutions,
- Key role in advanced technology sectors – they serve a role in computer drives, drive modules, diagnostic systems, also complex engineering applications.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Cons
- They are fragile upon heavy 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
- When exposed to high temperature, neodymium magnets suffer a drop in power. 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
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We suggest cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complex forms.
- Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
- Due to complex production process, their price exceeds standard values,
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- on a block made of structural steel, perfectly concentrating the magnetic flux
- with a cross-section minimum 10 mm
- with an ground touching surface
- without any insulating layer between the magnet and steel
- under axial force vector (90-degree angle)
- at standard ambient temperature
Key elements affecting lifting force
- Distance – the presence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Base massiveness – too thin steel does not accept the full field, causing part of the flux to be escaped into the air.
- Plate material – mild steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
- Surface finish – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
- Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.
Warnings
Flammability
Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.
Pinching danger
Big blocks can smash fingers in a fraction of a second. Do not put your hand betwixt two strong magnets.
Warning for allergy sufferers
Medical facts indicate that nickel (standard magnet coating) is a strong allergen. For allergy sufferers, avoid direct skin contact or opt for coated magnets.
Product not for children
Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are very dangerous.
Handling rules
Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.
Pacemakers
Warning for patients: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.
Electronic devices
Intense magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.
Magnet fragility
NdFeB magnets are ceramic materials, which means they are prone to chipping. Clashing of two magnets leads to them breaking into small pieces.
Heat warning
Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its properties and strength.
GPS Danger
Be aware: rare earth magnets produce a field that disrupts sensitive sensors. Keep a separation from your phone, tablet, and navigation systems.
