MPL 50x20x10 / N38 - lamellar magnet
lamellar magnet
Catalog no 020165
GTIN/EAN: 5906301811718
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
75 g
Magnetization Direction
↑ axial
Load capacity
29.99 kg / 294.15 N
Magnetic Induction
337.18 mT / 3372 Gs
Coating
[NiCuNi] Nickel
43.05 ZŁ with VAT / pcs + price for transport
35.00 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - MPL 50x20x10 / N38 - lamellar magnet
Specification / characteristics - MPL 50x20x10 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020165 |
| GTIN/EAN | 5906301811718 |
| 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 | 10 mm [±0,1 mm] |
| Weight | 75 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 29.99 kg / 294.15 N |
| Magnetic Induction ~ ? | 337.18 mT / 3372 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 modeling of the magnet - data
These values constitute the outcome of a engineering analysis. Results are based on models for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Use these calculations as a reference point during assembly planning.
Table 1: Static pull force (force vs gap) - interaction chart
MPL 50x20x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3371 Gs
337.1 mT
|
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
|
critical level |
| 1 mm |
3158 Gs
315.8 mT
|
26.32 kg / 58.03 pounds
26323.3 g / 258.2 N
|
critical level |
| 2 mm |
2932 Gs
293.2 mT
|
22.69 kg / 50.02 pounds
22687.6 g / 222.6 N
|
critical level |
| 3 mm |
2703 Gs
270.3 mT
|
19.29 kg / 42.52 pounds
19286.7 g / 189.2 N
|
critical level |
| 5 mm |
2266 Gs
226.6 mT
|
13.55 kg / 29.86 pounds
13546.3 g / 132.9 N
|
critical level |
| 10 mm |
1419 Gs
141.9 mT
|
5.31 kg / 11.71 pounds
5313.0 g / 52.1 N
|
warning |
| 15 mm |
908 Gs
90.8 mT
|
2.17 kg / 4.79 pounds
2174.5 g / 21.3 N
|
warning |
| 20 mm |
603 Gs
60.3 mT
|
0.96 kg / 2.12 pounds
961.0 g / 9.4 N
|
safe |
| 30 mm |
296 Gs
29.6 mT
|
0.23 kg / 0.51 pounds
231.0 g / 2.3 N
|
safe |
| 50 mm |
97 Gs
9.7 mT
|
0.02 kg / 0.05 pounds
24.8 g / 0.2 N
|
safe |
Table 2: Shear force (wall)
MPL 50x20x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
6.00 kg / 13.22 pounds
5998.0 g / 58.8 N
|
| 1 mm | Stal (~0.2) |
5.26 kg / 11.61 pounds
5264.0 g / 51.6 N
|
| 2 mm | Stal (~0.2) |
4.54 kg / 10.00 pounds
4538.0 g / 44.5 N
|
| 3 mm | Stal (~0.2) |
3.86 kg / 8.51 pounds
3858.0 g / 37.8 N
|
| 5 mm | Stal (~0.2) |
2.71 kg / 5.97 pounds
2710.0 g / 26.6 N
|
| 10 mm | Stal (~0.2) |
1.06 kg / 2.34 pounds
1062.0 g / 10.4 N
|
| 15 mm | Stal (~0.2) |
0.43 kg / 0.96 pounds
434.0 g / 4.3 N
|
| 20 mm | Stal (~0.2) |
0.19 kg / 0.42 pounds
192.0 g / 1.9 N
|
| 30 mm | Stal (~0.2) |
0.05 kg / 0.10 pounds
46.0 g / 0.5 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x20x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
9.00 kg / 19.83 pounds
8997.0 g / 88.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
6.00 kg / 13.22 pounds
5998.0 g / 58.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
3.00 kg / 6.61 pounds
2999.0 g / 29.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
15.00 kg / 33.06 pounds
14995.0 g / 147.1 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 50x20x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.50 kg / 3.31 pounds
1499.5 g / 14.7 N
|
| 1 mm |
|
3.75 kg / 8.26 pounds
3748.8 g / 36.8 N
|
| 2 mm |
|
7.50 kg / 16.53 pounds
7497.5 g / 73.6 N
|
| 3 mm |
|
11.25 kg / 24.79 pounds
11246.3 g / 110.3 N
|
| 5 mm |
|
18.74 kg / 41.32 pounds
18743.8 g / 183.9 N
|
| 10 mm |
|
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
|
| 11 mm |
|
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
|
| 12 mm |
|
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
|
Table 5: Thermal stability (stability) - resistance threshold
MPL 50x20x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
|
OK |
| 40 °C | -2.2% |
29.33 kg / 64.66 pounds
29330.2 g / 287.7 N
|
OK |
| 60 °C | -4.4% |
28.67 kg / 63.21 pounds
28670.4 g / 281.3 N
|
|
| 80 °C | -6.6% |
28.01 kg / 61.75 pounds
28010.7 g / 274.8 N
|
|
| 100 °C | -28.8% |
21.35 kg / 47.07 pounds
21352.9 g / 209.5 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 50x20x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
70.06 kg / 154.45 pounds
4 789 Gs
|
10.51 kg / 23.17 pounds
10509 g / 103.1 N
|
N/A |
| 1 mm |
65.83 kg / 145.13 pounds
6 535 Gs
|
9.87 kg / 21.77 pounds
9874 g / 96.9 N
|
59.25 kg / 130.61 pounds
~0 Gs
|
| 2 mm |
61.49 kg / 135.57 pounds
6 316 Gs
|
9.22 kg / 20.34 pounds
9224 g / 90.5 N
|
55.34 kg / 122.01 pounds
~0 Gs
|
| 3 mm |
57.20 kg / 126.10 pounds
6 092 Gs
|
8.58 kg / 18.92 pounds
8580 g / 84.2 N
|
51.48 kg / 113.49 pounds
~0 Gs
|
| 5 mm |
48.94 kg / 107.89 pounds
5 635 Gs
|
7.34 kg / 16.18 pounds
7341 g / 72.0 N
|
44.05 kg / 97.10 pounds
~0 Gs
|
| 10 mm |
31.64 kg / 69.76 pounds
4 531 Gs
|
4.75 kg / 10.46 pounds
4747 g / 46.6 N
|
28.48 kg / 62.79 pounds
~0 Gs
|
| 20 mm |
12.41 kg / 27.36 pounds
2 838 Gs
|
1.86 kg / 4.10 pounds
1862 g / 18.3 N
|
11.17 kg / 24.63 pounds
~0 Gs
|
| 50 mm |
1.07 kg / 2.35 pounds
832 Gs
|
0.16 kg / 0.35 pounds
160 g / 1.6 N
|
0.96 kg / 2.12 pounds
~0 Gs
|
| 60 mm |
0.54 kg / 1.19 pounds
592 Gs
|
0.08 kg / 0.18 pounds
81 g / 0.8 N
|
0.49 kg / 1.07 pounds
~0 Gs
|
| 70 mm |
0.29 kg / 0.64 pounds
433 Gs
|
0.04 kg / 0.10 pounds
43 g / 0.4 N
|
0.26 kg / 0.57 pounds
~0 Gs
|
| 80 mm |
0.16 kg / 0.36 pounds
324 Gs
|
0.02 kg / 0.05 pounds
24 g / 0.2 N
|
0.15 kg / 0.32 pounds
~0 Gs
|
| 90 mm |
0.10 kg / 0.21 pounds
248 Gs
|
0.01 kg / 0.03 pounds
14 g / 0.1 N
|
0.09 kg / 0.19 pounds
~0 Gs
|
| 100 mm |
0.06 kg / 0.13 pounds
194 Gs
|
0.01 kg / 0.02 pounds
9 g / 0.1 N
|
0.05 kg / 0.11 pounds
~0 Gs
|
Table 7: Hazards (electronics) - precautionary measures
MPL 50x20x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 15.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 12.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 9.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 7.5 cm |
| Remote | 50 Gs (5.0 mT) | 7.0 cm |
| Payment card | 400 Gs (40.0 mT) | 3.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.5 cm |
Table 8: Collisions (cracking risk) - collision effects
MPL 50x20x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.29 km/h
(6.19 m/s)
|
1.44 J | |
| 30 mm |
35.10 km/h
(9.75 m/s)
|
3.56 J | |
| 50 mm |
45.12 km/h
(12.53 m/s)
|
5.89 J | |
| 100 mm |
63.77 km/h
(17.72 m/s)
|
11.77 J |
Table 9: Anti-corrosion coating durability
MPL 50x20x10 / 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 50x20x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 32 980 Mx | 329.8 µWb |
| Pc Coefficient | 0.38 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MPL 50x20x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 29.99 kg | Standard |
| Water (riverbed) |
34.34 kg
(+4.35 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical surface, the magnet holds merely a fraction of its perpendicular strength.
2. Steel thickness impact
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Power loss vs temp
*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) = 0.38
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 offers
Advantages as well as disadvantages of Nd2Fe14B magnets.
Strengths
- Their magnetic field is maintained, and after around ten years it decreases only by ~1% (according to research),
- Magnets effectively defend themselves against demagnetization caused by foreign field sources,
- Thanks to the elegant finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an elegant appearance,
- Neodymium magnets deliver maximum magnetic induction on a small surface, which allows for strong attraction,
- Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to versatility in constructing and the capacity to adapt to complex applications,
- Fundamental importance in future technologies – they are utilized in data components, motor assemblies, medical equipment, also complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Disadvantages
- They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
- When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength 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 advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
- We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complex forms.
- Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small components of these products can be problematic in diagnostics medical in case of swallowing.
- Due to neodymium price, their price is relatively high,
Holding force characteristics
Maximum lifting capacity of the magnet – what contributes to it?
- with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
- with a thickness minimum 10 mm
- with an polished contact surface
- under conditions of gap-free contact (metal-to-metal)
- for force applied at a right angle (pull-off, not shear)
- in stable room temperature
Impact of factors on magnetic holding capacity in practice
- Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
- Plate thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be escaped into the air.
- Metal type – not every steel reacts the same. High carbon content weaken the attraction effect.
- Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
- Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.
Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.
Precautions when working with neodymium magnets
Allergic reactions
Some people experience a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Extended handling may cause dermatitis. It is best to use protective gloves.
No play value
Product intended for adults. Tiny parts pose a choking risk, leading to severe trauma. Store away from children and animals.
Crushing force
Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Be careful!
Dust explosion hazard
Machining of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.
Electronic hazard
Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.
Handling rules
Exercise caution. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can react.
GPS Danger
Remember: rare earth magnets generate a field that interferes with precision electronics. Keep a separation from your phone, tablet, and navigation systems.
Protective goggles
Neodymium magnets are ceramic materials, which means they are very brittle. Clashing of two magnets will cause them cracking into small pieces.
Do not overheat magnets
Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.
Life threat
People with a heart stimulator must maintain an large gap from magnets. The magnetism can disrupt the operation of the life-saving device.
