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:
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Technical of the product - 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 |
Technical simulation of the product - technical parameters
These information are the outcome of a physical simulation. Results rely on models for the material Nd2Fe14B. Real-world performance may differ. Please consider these data as a preliminary roadmap during assembly planning.
Table 1: Static force (pull vs gap) - characteristics
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: Sliding 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) - 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: Steel thickness (substrate influence) - 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 resistance (material behavior) - resistance threshold
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: Two magnets (repulsion) - forces in the system
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 |
| Mechanical watch | 20 Gs (2.0 mT) | 7.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 5.5 cm |
| Car key | 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 (cracking risk) - 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: Corrosion resistance
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 (Pc)
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. Shear force
*Note: On a vertical surface, the magnet holds only ~20% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Thermal stability
*For N38 material, the safety limit 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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Advantages and disadvantages of rare earth magnets.
Advantages
- They do not lose magnetism, even over around ten years – the drop in strength is only ~1% (based on measurements),
- Neodymium magnets prove to be remarkably resistant to magnetic field loss caused by external field sources,
- By covering with a decorative coating of nickel, the element acquires an elegant look,
- Neodymium magnets ensure maximum magnetic induction on a contact point, which allows for strong attraction,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Considering the ability of precise shaping and customization to unique solutions, NdFeB magnets can be manufactured in a broad palette of geometric configurations, which expands the range of possible applications,
- Universal use in modern technologies – they find application in mass storage devices, electric motors, medical equipment, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems
Disadvantages
- At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- When exposed to high temperature, neodymium magnets suffer a drop in force. 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
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Limited ability of producing threads in the magnet and complex forms - recommended is casing - mounting mechanism.
- Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these products can complicate diagnosis medical after entering the body.
- Due to expensive raw materials, their price is higher than average,
Lifting parameters
Detachment force of the magnet in optimal conditions – what contributes to it?
- with the application of a sheet made of special test steel, guaranteeing maximum field concentration
- with a thickness of at least 10 mm
- characterized by even structure
- without the slightest clearance between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- at standard ambient temperature
Lifting capacity in practice – influencing factors
- Distance – the presence of foreign body (paint, tape, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
- Direction of force – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Material composition – different alloys reacts the same. High carbon content weaken the attraction effect.
- Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
- Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.
Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.
Warnings
Bodily injuries
Pinching hazard: The attraction force is so immense that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.
Implant safety
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.
Danger to the youngest
These products are not suitable for play. Swallowing multiple magnets may result in them attracting across intestines, which poses a severe health hazard and necessitates urgent medical intervention.
Safe operation
Use magnets consciously. Their immense force can shock even professionals. Stay alert and do not underestimate their power.
Maximum temperature
Monitor thermal conditions. Exposing the magnet to high heat will ruin its magnetic structure and strength.
Do not drill into magnets
Machining of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Data carriers
Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
GPS and phone interference
A powerful magnetic field disrupts the operation of compasses in phones and navigation systems. Keep magnets near a device to avoid breaking the sensors.
Magnet fragility
Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.
Warning for allergy sufferers
Certain individuals have a hypersensitivity to Ni, which is the common plating for neodymium magnets. Frequent touching can result in an allergic reaction. We strongly advise use safety gloves.
