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
- Coating
- [NiCuNi] Nickel
38.47 zł net / pcs
47.32 zł with VAT (23% VAT) / pcs
bulk discounts:
Need more?Frequently asked questions
How much will a block magnet really hold?
What is the maximum working temperature?
What safety factor should I allow?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Physical properties - 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 - technical parameters
The following information represent the direct effect of a mathematical calculation. Values rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.
Table 1: Static pull force (force vs distance) - 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 LBS
42180.0 g / 413.8 N
|
dangerous! |
| 1 mm |
4452 Gs
445.2 mT
|
36.46 kg / 80.38 LBS
36461.5 g / 357.7 N
|
dangerous! |
| 2 mm |
4114 Gs
411.4 mT
|
31.13 kg / 68.62 LBS
31126.5 g / 305.4 N
|
dangerous! |
| 3 mm |
3784 Gs
378.4 mT
|
26.34 kg / 58.06 LBS
26336.3 g / 258.4 N
|
dangerous! |
| 5 mm |
3173 Gs
317.3 mT
|
18.52 kg / 40.84 LBS
18523.4 g / 181.7 N
|
dangerous! |
| 10 mm |
2022 Gs
202.2 mT
|
7.52 kg / 16.59 LBS
7522.9 g / 73.8 N
|
medium risk |
| 15 mm |
1324 Gs
132.4 mT
|
3.22 kg / 7.10 LBS
3222.6 g / 31.6 N
|
medium risk |
| 20 mm |
899 Gs
89.9 mT
|
1.49 kg / 3.28 LBS
1487.5 g / 14.6 N
|
low risk |
| 30 mm |
458 Gs
45.8 mT
|
0.39 kg / 0.85 LBS
385.8 g / 3.8 N
|
low risk |
| 50 mm |
159 Gs
15.9 mT
|
0.05 kg / 0.10 LBS
46.4 g / 0.5 N
|
low risk |
Table 2: Shear load (wall)
MPL 50x20x20 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
8.44 kg / 18.60 LBS
8436.0 g / 82.8 N
|
| 1 mm | Stal (~0.2) |
7.29 kg / 16.08 LBS
7292.0 g / 71.5 N
|
| 2 mm | Stal (~0.2) |
6.23 kg / 13.73 LBS
6226.0 g / 61.1 N
|
| 3 mm | Stal (~0.2) |
5.27 kg / 11.61 LBS
5268.0 g / 51.7 N
|
| 5 mm | Stal (~0.2) |
3.70 kg / 8.17 LBS
3704.0 g / 36.3 N
|
| 10 mm | Stal (~0.2) |
1.50 kg / 3.32 LBS
1504.0 g / 14.8 N
|
| 15 mm | Stal (~0.2) |
0.64 kg / 1.42 LBS
644.0 g / 6.3 N
|
| 20 mm | Stal (~0.2) |
0.30 kg / 0.66 LBS
298.0 g / 2.9 N
|
| 30 mm | Stal (~0.2) |
0.08 kg / 0.17 LBS
78.0 g / 0.8 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 LBS
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 LBS
12654.0 g / 124.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
8.44 kg / 18.60 LBS
8436.0 g / 82.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.22 kg / 9.30 LBS
4218.0 g / 41.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
21.09 kg / 46.50 LBS
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 LBS
2109.0 g / 20.7 N
|
| 1 mm |
|
5.27 kg / 11.62 LBS
5272.5 g / 51.7 N
|
| 2 mm |
|
10.55 kg / 23.25 LBS
10545.0 g / 103.4 N
|
| 3 mm |
|
15.82 kg / 34.87 LBS
15817.5 g / 155.2 N
|
| 5 mm |
|
26.36 kg / 58.12 LBS
26362.5 g / 258.6 N
|
| 10 mm |
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
| 11 mm |
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
| 12 mm |
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
Table 5: Thermal resistance (stability) - power drop
MPL 50x20x20 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
OK |
| 40 °C | -2.2% |
41.25 kg / 90.95 LBS
41252.0 g / 404.7 N
|
OK |
| 60 °C | -4.4% |
40.32 kg / 88.90 LBS
40324.1 g / 395.6 N
|
OK |
| 80 °C | -6.6% |
39.40 kg / 86.85 LBS
39396.1 g / 386.5 N
|
|
| 100 °C | -28.8% |
30.03 kg / 66.21 LBS
30032.2 g / 294.6 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
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 LBS
5 687 Gs
|
21.21 kg / 46.75 LBS
21205 g / 208.0 N
|
N/A |
| 1 mm |
131.73 kg / 290.41 LBS
9 245 Gs
|
19.76 kg / 43.56 LBS
19759 g / 193.8 N
|
118.55 kg / 261.37 LBS
~0 Gs
|
| 2 mm |
122.20 kg / 269.41 LBS
8 904 Gs
|
18.33 kg / 40.41 LBS
18330 g / 179.8 N
|
109.98 kg / 242.47 LBS
~0 Gs
|
| 3 mm |
113.05 kg / 249.23 LBS
8 564 Gs
|
16.96 kg / 37.38 LBS
16957 g / 166.4 N
|
101.74 kg / 224.31 LBS
~0 Gs
|
| 5 mm |
96.05 kg / 211.76 LBS
7 894 Gs
|
14.41 kg / 31.76 LBS
14408 g / 141.3 N
|
86.45 kg / 190.58 LBS
~0 Gs
|
| 10 mm |
62.08 kg / 136.87 LBS
6 347 Gs
|
9.31 kg / 20.53 LBS
9312 g / 91.4 N
|
55.87 kg / 123.18 LBS
~0 Gs
|
| 20 mm |
25.21 kg / 55.59 LBS
4 045 Gs
|
3.78 kg / 8.34 LBS
3782 g / 37.1 N
|
22.69 kg / 50.03 LBS
~0 Gs
|
| 50 mm |
2.46 kg / 5.43 LBS
1 264 Gs
|
0.37 kg / 0.81 LBS
370 g / 3.6 N
|
2.22 kg / 4.89 LBS
~0 Gs
|
| 60 mm |
1.29 kg / 2.85 LBS
916 Gs
|
0.19 kg / 0.43 LBS
194 g / 1.9 N
|
1.16 kg / 2.57 LBS
~0 Gs
|
| 70 mm |
0.71 kg / 1.58 LBS
681 Gs
|
0.11 kg / 0.24 LBS
107 g / 1.1 N
|
0.64 kg / 1.42 LBS
~0 Gs
|
| 80 mm |
0.41 kg / 0.91 LBS
518 Gs
|
0.06 kg / 0.14 LBS
62 g / 0.6 N
|
0.37 kg / 0.82 LBS
~0 Gs
|
| 90 mm |
0.25 kg / 0.55 LBS
402 Gs
|
0.04 kg / 0.08 LBS
37 g / 0.4 N
|
0.22 kg / 0.49 LBS
~0 Gs
|
| 100 mm |
0.16 kg / 0.34 LBS
318 Gs
|
0.02 kg / 0.05 LBS
23 g / 0.2 N
|
0.14 kg / 0.31 LBS
~0 Gs
|
Table 7: Hazards (implants) - warnings
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 |
| 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: Impact energy (kinetic energy) - collision effects
MPL 50x20x20 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
18.74 km/h
(5.21 m/s)
|
2.03 J | |
| 30 mm |
20.65 km/h
(5.74 m/s)
|
2.47 J | |
| 50 mm |
20.78 km/h
(5.77 m/s)
|
2.50 J | |
| 100 mm |
20.80 km/h
(5.78 m/s)
|
2.50 J |
Table 9: Surface protection spec
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: Electrical 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: 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 ~20% of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) severely weakens the holding force.
3. Heat tolerance
*For N38 grade, the max working temp 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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths as well as weaknesses of rare earth magnets.
Advantages
- They do not lose power, even after approximately ten years – the drop in lifting capacity is only ~1% (according to tests),
- Magnets perfectly resist against loss of magnetization caused by external fields,
- The use of an refined layer of noble metals (nickel, gold, silver) causes the element to present itself better,
- Magnetic induction on the working part of the magnet is exceptional,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
- Thanks to flexibility in forming and the capacity to adapt to unusual requirements,
- Wide application in modern technologies – they find application in data components, motor assemblies, diagnostic systems, also industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions
Disadvantages
- 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
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
- We suggest casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated shapes.
- Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical when they are in the body.
- With budget limitations the cost of neodymium magnets is economically unviable,
Pull force analysis
Maximum lifting capacity of the magnet – what contributes to it?
- using a base made of mild steel, functioning as a circuit closing element
- with a cross-section no less than 10 mm
- with an ground contact surface
- with zero gap (no coatings)
- for force acting at a right angle (in the magnet axis)
- at standard ambient temperature
Determinants of practical lifting force of a magnet
- Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Steel thickness – too thin steel does not accept the full field, causing part of the power to be wasted into the air.
- Steel grade – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
- Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
- Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.
Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Precautions when working with NdFeB magnets
Material brittleness
Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.
Choking Hazard
Always store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are fatal.
Threat to navigation
A strong magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Keep magnets close to a device to avoid breaking the sensors.
Cards and drives
Avoid bringing magnets close to a wallet, laptop, or screen. The magnetism can permanently damage these devices and erase data from cards.
Powerful field
Use magnets consciously. Their huge power can surprise even professionals. Stay alert and do not underestimate their force.
Metal Allergy
Medical facts indicate that nickel (the usual finish) is a strong allergen. For allergy sufferers, avoid touching magnets with bare hands or choose encased magnets.
Permanent damage
Keep cool. NdFeB magnets are sensitive to heat. If you require operation above 80°C, ask us about HT versions (H, SH, UH).
Finger safety
Big blocks can break fingers instantly. Never put your hand betwixt two strong magnets.
Pacemakers
For implant holders: Strong magnetic fields disrupt electronics. Keep at least 30 cm distance or ask another person to work with the magnets.
Mechanical processing
Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.
