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
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Technical data - 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 simulation of the magnet - data
These data represent the result of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.
Table 1: Static 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
|
safe |
| 20 mm |
350 Gs
35.0 mT
|
0.33 kg / 0.72 pounds
327.0 g / 3.2 N
|
safe |
| 30 mm |
160 Gs
16.0 mT
|
0.07 kg / 0.15 pounds
68.5 g / 0.7 N
|
safe |
| 50 mm |
48 Gs
4.8 mT
|
0.01 kg / 0.01 pounds
6.2 g / 0.1 N
|
safe |
Table 2: Shear load (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: Wall mounting (shearing) - behavior on slippery surfaces
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) - sheet metal selection
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: Working in heat (material behavior) - thermal limit
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 (attraction) - field range
MPL 42x20x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (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: Safety (HSE) (electronics) - 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 |
| Timepiece | 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: Dynamics (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. Wall mount (shear)
*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Heat tolerance
*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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Advantages and disadvantages of Nd2Fe14B magnets.
Strengths
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
- Magnets very well defend themselves against loss of magnetization caused by ambient magnetic noise,
- In other words, due to the shiny finish of gold, the element becomes visually attractive,
- Neodymium magnets create maximum magnetic induction on a small area, which ensures high operational effectiveness,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
- Thanks to modularity in shaping and the ability to customize to individual projects,
- Significant place in advanced technology sectors – they are commonly used in HDD drives, electric motors, diagnostic systems, and multitasking production systems.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Cons
- To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- Limited possibility of producing threads in the magnet and complex shapes - preferred is cover - magnetic holder.
- Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Holding force characteristics
Optimal lifting capacity of a neodymium magnet – what affects it?
- using a base made of mild steel, functioning as a magnetic yoke
- with a cross-section minimum 10 mm
- characterized by smoothness
- with zero gap (no impurities)
- during pulling in a direction vertical to the mounting surface
- at temperature approx. 20 degrees Celsius
Determinants of practical lifting force of a magnet
- Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Material composition – different alloys reacts the same. Alloy additives weaken the attraction effect.
- Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.
Safe handling of NdFeB magnets
Power loss in heat
Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.
Magnet fragility
Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Allergic reactions
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease handling magnets and use protective gear.
Machining danger
Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Do not give to children
Only for adults. Tiny parts can be swallowed, causing severe trauma. Keep away from children and animals.
Impact on smartphones
An intense magnetic field disrupts the operation of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.
Protect data
Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.
Life threat
Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or request help to handle the magnets.
Powerful field
Exercise caution. Rare earth magnets act from a long distance and snap with massive power, often faster than you can move away.
Finger safety
Big blocks can smash fingers instantly. Under no circumstances put your hand between two attracting surfaces.
