MPL 42x20x5 / N38 - lamellar magnet
lamellar magnet
Catalog no 020163
GTIN/EAN: 5906301811695
length
42 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
31.5 g
Magnetization Direction
↑ axial
Load capacity
11.06 kg / 108.46 N
Magnetic Induction
203.37 mT / 2034 Gs
Coating
[NiCuNi] Nickel
15.62 ZŁ with VAT / pcs + price for transport
12.70 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?
Give us a call
+48 22 499 98 98
alternatively let us know via
form
the contact section.
Specifications and structure of a magnet can be reviewed with our
our magnetic calculator.
Orders placed before 14:00 will be shipped the same business day.
Detailed specification - MPL 42x20x5 / N38 - lamellar magnet
Specification / characteristics - MPL 42x20x5 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020163 |
| GTIN/EAN | 5906301811695 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 42 mm [±0,1 mm] |
| Width | 20 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 31.5 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 11.06 kg / 108.46 N |
| Magnetic Induction ~ ? | 203.37 mT / 2034 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 modeling of the product - data
The following data are the outcome of a physical analysis. Values are based on models for the class Nd2Fe14B. Real-world performance may differ. Treat these calculations as a preliminary roadmap for designers.
Table 1: Static pull force (force vs distance) - power drop
MPL 42x20x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2033 Gs
203.3 mT
|
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
|
critical level |
| 1 mm |
1938 Gs
193.8 mT
|
10.05 kg / 22.15 pounds
10049.3 g / 98.6 N
|
critical level |
| 2 mm |
1823 Gs
182.3 mT
|
8.89 kg / 19.60 pounds
8888.2 g / 87.2 N
|
strong |
| 3 mm |
1696 Gs
169.6 mT
|
7.69 kg / 16.96 pounds
7691.7 g / 75.5 N
|
strong |
| 5 mm |
1433 Gs
143.3 mT
|
5.49 kg / 12.10 pounds
5490.3 g / 53.9 N
|
strong |
| 10 mm |
885 Gs
88.5 mT
|
2.09 kg / 4.62 pounds
2093.5 g / 20.5 N
|
strong |
| 15 mm |
547 Gs
54.7 mT
|
0.80 kg / 1.76 pounds
799.6 g / 7.8 N
|
weak grip |
| 20 mm |
350 Gs
35.0 mT
|
0.33 kg / 0.72 pounds
327.0 g / 3.2 N
|
weak grip |
| 30 mm |
160 Gs
16.0 mT
|
0.07 kg / 0.15 pounds
68.5 g / 0.7 N
|
weak grip |
| 50 mm |
48 Gs
4.8 mT
|
0.01 kg / 0.01 pounds
6.2 g / 0.1 N
|
weak grip |
Table 2: Vertical capacity (wall)
MPL 42x20x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.21 kg / 4.88 pounds
2212.0 g / 21.7 N
|
| 1 mm | Stal (~0.2) |
2.01 kg / 4.43 pounds
2010.0 g / 19.7 N
|
| 2 mm | Stal (~0.2) |
1.78 kg / 3.92 pounds
1778.0 g / 17.4 N
|
| 3 mm | Stal (~0.2) |
1.54 kg / 3.39 pounds
1538.0 g / 15.1 N
|
| 5 mm | Stal (~0.2) |
1.10 kg / 2.42 pounds
1098.0 g / 10.8 N
|
| 10 mm | Stal (~0.2) |
0.42 kg / 0.92 pounds
418.0 g / 4.1 N
|
| 15 mm | Stal (~0.2) |
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
|
| 20 mm | Stal (~0.2) |
0.07 kg / 0.15 pounds
66.0 g / 0.6 N
|
| 30 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
14.0 g / 0.1 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
Table 3: Vertical assembly (sliding) - vertical pull
MPL 42x20x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
3.32 kg / 7.31 pounds
3318.0 g / 32.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.21 kg / 4.88 pounds
2212.0 g / 21.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.11 kg / 2.44 pounds
1106.0 g / 10.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
5.53 kg / 12.19 pounds
5530.0 g / 54.2 N
|
Table 4: Material efficiency (saturation) - power losses
MPL 42x20x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.55 kg / 1.22 pounds
553.0 g / 5.4 N
|
| 1 mm |
|
1.38 kg / 3.05 pounds
1382.5 g / 13.6 N
|
| 2 mm |
|
2.77 kg / 6.10 pounds
2765.0 g / 27.1 N
|
| 3 mm |
|
4.15 kg / 9.14 pounds
4147.5 g / 40.7 N
|
| 5 mm |
|
6.91 kg / 15.24 pounds
6912.5 g / 67.8 N
|
| 10 mm |
|
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
|
| 11 mm |
|
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
|
| 12 mm |
|
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
|
Table 5: Thermal stability (material behavior) - power drop
MPL 42x20x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
|
OK |
| 40 °C | -2.2% |
10.82 kg / 23.85 pounds
10816.7 g / 106.1 N
|
OK |
| 60 °C | -4.4% |
10.57 kg / 23.31 pounds
10573.4 g / 103.7 N
|
|
| 80 °C | -6.6% |
10.33 kg / 22.77 pounds
10330.0 g / 101.3 N
|
|
| 100 °C | -28.8% |
7.87 kg / 17.36 pounds
7874.7 g / 77.3 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 42x20x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
21.41 kg / 47.21 pounds
3 465 Gs
|
3.21 kg / 7.08 pounds
3212 g / 31.5 N
|
N/A |
| 1 mm |
20.49 kg / 45.17 pounds
3 978 Gs
|
3.07 kg / 6.78 pounds
3074 g / 30.2 N
|
18.44 kg / 40.66 pounds
~0 Gs
|
| 2 mm |
19.46 kg / 42.89 pounds
3 877 Gs
|
2.92 kg / 6.43 pounds
2918 g / 28.6 N
|
17.51 kg / 38.60 pounds
~0 Gs
|
| 3 mm |
18.35 kg / 40.46 pounds
3 765 Gs
|
2.75 kg / 6.07 pounds
2753 g / 27.0 N
|
16.52 kg / 36.41 pounds
~0 Gs
|
| 5 mm |
16.05 kg / 35.38 pounds
3 521 Gs
|
2.41 kg / 5.31 pounds
2407 g / 23.6 N
|
14.44 kg / 31.84 pounds
~0 Gs
|
| 10 mm |
10.63 kg / 23.43 pounds
2 865 Gs
|
1.59 kg / 3.52 pounds
1594 g / 15.6 N
|
9.57 kg / 21.09 pounds
~0 Gs
|
| 20 mm |
4.05 kg / 8.94 pounds
1 769 Gs
|
0.61 kg / 1.34 pounds
608 g / 6.0 N
|
3.65 kg / 8.04 pounds
~0 Gs
|
| 50 mm |
0.28 kg / 0.62 pounds
465 Gs
|
0.04 kg / 0.09 pounds
42 g / 0.4 N
|
0.25 kg / 0.55 pounds
~0 Gs
|
| 60 mm |
0.13 kg / 0.29 pounds
320 Gs
|
0.02 kg / 0.04 pounds
20 g / 0.2 N
|
0.12 kg / 0.26 pounds
~0 Gs
|
| 70 mm |
0.07 kg / 0.15 pounds
228 Gs
|
0.01 kg / 0.02 pounds
10 g / 0.1 N
|
0.06 kg / 0.13 pounds
~0 Gs
|
| 80 mm |
0.04 kg / 0.08 pounds
167 Gs
|
0.01 kg / 0.01 pounds
5 g / 0.1 N
|
0.03 kg / 0.07 pounds
~0 Gs
|
| 90 mm |
0.02 kg / 0.04 pounds
125 Gs
|
0.00 kg / 0.01 pounds
3 g / 0.0 N
|
0.02 kg / 0.04 pounds
~0 Gs
|
| 100 mm |
0.01 kg / 0.03 pounds
96 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.02 pounds
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MPL 42x20x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 11.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 9.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 7.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 5.5 cm |
| Remote | 50 Gs (5.0 mT) | 5.0 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 42x20x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
21.01 km/h
(5.84 m/s)
|
0.54 J | |
| 30 mm |
32.86 km/h
(9.13 m/s)
|
1.31 J | |
| 50 mm |
42.27 km/h
(11.74 m/s)
|
2.17 J | |
| 100 mm |
59.76 km/h
(16.60 m/s)
|
4.34 J |
Table 9: Surface protection spec
MPL 42x20x5 / 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 42x20x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 18 614 Mx | 186.1 µWb |
| Pc Coefficient | 0.23 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MPL 42x20x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 11.06 kg | Standard |
| Water (riverbed) |
12.66 kg
(+1.60 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical wall, the magnet holds just a fraction of its max power.
2. Efficiency vs thickness
*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.
3. Temperature resistance
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.23
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.
Material specification
| 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 |
Other offers
Advantages as well as disadvantages of Nd2Fe14B magnets.
Benefits
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
- They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
- A magnet with a shiny silver surface has better aesthetics,
- The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
- Thanks to versatility in shaping and the ability to customize to complex applications,
- Significant place in innovative solutions – they are commonly used in magnetic memories, electric drive systems, precision medical tools, and complex engineering applications.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Limitations
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- Due to limitations in producing threads and complex shapes in magnets, we propose using cover - magnetic holder.
- Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small elements of these products can disrupt the diagnostic process medical in case of swallowing.
- Due to complex production process, their price exceeds standard values,
Lifting parameters
Maximum magnetic pulling force – what affects it?
- using a base made of mild steel, serving as a circuit closing element
- with a thickness of at least 10 mm
- with a plane cleaned and smooth
- under conditions of gap-free contact (surface-to-surface)
- for force acting at a right angle (pull-off, not shear)
- at room temperature
Key elements affecting lifting force
- Air gap (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
- 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.
- Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
- Surface quality – the more even the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
- Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate decreases the load capacity.
Safe handling of NdFeB magnets
Material brittleness
NdFeB magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets leads to them breaking into shards.
Crushing force
Pinching hazard: The attraction force is so great that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.
Do not drill into magnets
Machining of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Swallowing risk
Neodymium magnets are not suitable for play. Accidental ingestion of a few magnets may result in them pinching intestinal walls, which poses a critical condition and necessitates immediate surgery.
Heat warning
Do not overheat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).
Implant safety
Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.
Phone sensors
An intense magnetic field disrupts the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to prevent damaging the sensors.
Nickel coating and allergies
Some people experience a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Extended handling might lead to skin redness. We strongly advise use protective gloves.
Threat to electronics
Avoid bringing magnets near a purse, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.
Handling guide
Be careful. Rare earth magnets act from a distance and snap with huge force, often faster than you can react.
