MPL 40x20x10 / N38 - lamellar magnet
lamellar magnet
Catalog no 020158
GTIN/EAN: 5906301811640
length
40 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
60 g
Magnetization Direction
↑ axial
Load capacity
24.62 kg / 241.53 N
Magnetic Induction
349.60 mT / 3496 Gs
Coating
[NiCuNi] Nickel
31.00 ZŁ with VAT / pcs + price for transport
25.20 ZŁ net + 23% VAT / pcs
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Technical details - MPL 40x20x10 / N38 - lamellar magnet
Specification / characteristics - MPL 40x20x10 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020158 |
| GTIN/EAN | 5906301811640 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 40 mm [±0,1 mm] |
| Width | 20 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 60 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 24.62 kg / 241.53 N |
| Magnetic Induction ~ ? | 349.60 mT / 3496 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 analysis of the assembly - technical parameters
These values constitute the outcome of a mathematical analysis. Values rely on algorithms for the class Nd2Fe14B. Real-world conditions may differ. Use these calculations as a reference point when designing systems.
Table 1: Static force (pull vs gap) - characteristics
MPL 40x20x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3495 Gs
349.5 mT
|
24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
|
dangerous! |
| 1 mm |
3272 Gs
327.2 mT
|
21.58 kg / 47.57 pounds
21578.0 g / 211.7 N
|
dangerous! |
| 2 mm |
3035 Gs
303.5 mT
|
18.56 kg / 40.92 pounds
18559.3 g / 182.1 N
|
dangerous! |
| 3 mm |
2794 Gs
279.4 mT
|
15.73 kg / 34.69 pounds
15733.0 g / 154.3 N
|
dangerous! |
| 5 mm |
2332 Gs
233.2 mT
|
10.96 kg / 24.16 pounds
10959.2 g / 107.5 N
|
dangerous! |
| 10 mm |
1433 Gs
143.3 mT
|
4.14 kg / 9.12 pounds
4136.4 g / 40.6 N
|
medium risk |
| 15 mm |
891 Gs
89.1 mT
|
1.60 kg / 3.52 pounds
1598.7 g / 15.7 N
|
safe |
| 20 mm |
574 Gs
57.4 mT
|
0.66 kg / 1.46 pounds
664.0 g / 6.5 N
|
safe |
| 30 mm |
267 Gs
26.7 mT
|
0.14 kg / 0.32 pounds
143.7 g / 1.4 N
|
safe |
| 50 mm |
82 Gs
8.2 mT
|
0.01 kg / 0.03 pounds
13.7 g / 0.1 N
|
safe |
Table 2: Slippage capacity (wall)
MPL 40x20x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.92 kg / 10.86 pounds
4924.0 g / 48.3 N
|
| 1 mm | Stal (~0.2) |
4.32 kg / 9.52 pounds
4316.0 g / 42.3 N
|
| 2 mm | Stal (~0.2) |
3.71 kg / 8.18 pounds
3712.0 g / 36.4 N
|
| 3 mm | Stal (~0.2) |
3.15 kg / 6.94 pounds
3146.0 g / 30.9 N
|
| 5 mm | Stal (~0.2) |
2.19 kg / 4.83 pounds
2192.0 g / 21.5 N
|
| 10 mm | Stal (~0.2) |
0.83 kg / 1.83 pounds
828.0 g / 8.1 N
|
| 15 mm | Stal (~0.2) |
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
|
| 20 mm | Stal (~0.2) |
0.13 kg / 0.29 pounds
132.0 g / 1.3 N
|
| 30 mm | Stal (~0.2) |
0.03 kg / 0.06 pounds
28.0 g / 0.3 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MPL 40x20x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
7.39 kg / 16.28 pounds
7386.0 g / 72.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.92 kg / 10.86 pounds
4924.0 g / 48.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.46 kg / 5.43 pounds
2462.0 g / 24.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
12.31 kg / 27.14 pounds
12310.0 g / 120.8 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 40x20x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.23 kg / 2.71 pounds
1231.0 g / 12.1 N
|
| 1 mm |
|
3.08 kg / 6.78 pounds
3077.5 g / 30.2 N
|
| 2 mm |
|
6.16 kg / 13.57 pounds
6155.0 g / 60.4 N
|
| 3 mm |
|
9.23 kg / 20.35 pounds
9232.5 g / 90.6 N
|
| 5 mm |
|
15.39 kg / 33.92 pounds
15387.5 g / 151.0 N
|
| 10 mm |
|
24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
|
| 11 mm |
|
24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
|
| 12 mm |
|
24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
|
Table 5: Thermal stability (material behavior) - thermal limit
MPL 40x20x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
24.62 kg / 54.28 pounds
24620.0 g / 241.5 N
|
OK |
| 40 °C | -2.2% |
24.08 kg / 53.08 pounds
24078.4 g / 236.2 N
|
OK |
| 60 °C | -4.4% |
23.54 kg / 51.89 pounds
23536.7 g / 230.9 N
|
|
| 80 °C | -6.6% |
23.00 kg / 50.70 pounds
22995.1 g / 225.6 N
|
|
| 100 °C | -28.8% |
17.53 kg / 38.65 pounds
17529.4 g / 172.0 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 40x20x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
60.25 kg / 132.83 pounds
4 926 Gs
|
9.04 kg / 19.93 pounds
9038 g / 88.7 N
|
N/A |
| 1 mm |
56.58 kg / 124.73 pounds
6 774 Gs
|
8.49 kg / 18.71 pounds
8487 g / 83.3 N
|
50.92 kg / 112.26 pounds
~0 Gs
|
| 2 mm |
52.81 kg / 116.42 pounds
6 544 Gs
|
7.92 kg / 17.46 pounds
7921 g / 77.7 N
|
47.53 kg / 104.78 pounds
~0 Gs
|
| 3 mm |
49.07 kg / 108.19 pounds
6 309 Gs
|
7.36 kg / 16.23 pounds
7361 g / 72.2 N
|
44.17 kg / 97.37 pounds
~0 Gs
|
| 5 mm |
41.89 kg / 92.34 pounds
5 828 Gs
|
6.28 kg / 13.85 pounds
6283 g / 61.6 N
|
37.70 kg / 83.11 pounds
~0 Gs
|
| 10 mm |
26.82 kg / 59.13 pounds
4 664 Gs
|
4.02 kg / 8.87 pounds
4023 g / 39.5 N
|
24.14 kg / 53.22 pounds
~0 Gs
|
| 20 mm |
10.12 kg / 22.32 pounds
2 865 Gs
|
1.52 kg / 3.35 pounds
1518 g / 14.9 N
|
9.11 kg / 20.09 pounds
~0 Gs
|
| 50 mm |
0.73 kg / 1.61 pounds
769 Gs
|
0.11 kg / 0.24 pounds
109 g / 1.1 N
|
0.66 kg / 1.45 pounds
~0 Gs
|
| 60 mm |
0.35 kg / 0.78 pounds
534 Gs
|
0.05 kg / 0.12 pounds
53 g / 0.5 N
|
0.32 kg / 0.70 pounds
~0 Gs
|
| 70 mm |
0.18 kg / 0.40 pounds
383 Gs
|
0.03 kg / 0.06 pounds
27 g / 0.3 N
|
0.16 kg / 0.36 pounds
~0 Gs
|
| 80 mm |
0.10 kg / 0.22 pounds
282 Gs
|
0.01 kg / 0.03 pounds
15 g / 0.1 N
|
0.09 kg / 0.20 pounds
~0 Gs
|
| 90 mm |
0.06 kg / 0.12 pounds
214 Gs
|
0.01 kg / 0.02 pounds
8 g / 0.1 N
|
0.05 kg / 0.11 pounds
~0 Gs
|
| 100 mm |
0.03 kg / 0.07 pounds
165 Gs
|
0.01 kg / 0.01 pounds
5 g / 0.0 N
|
0.03 kg / 0.07 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MPL 40x20x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 14.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 11.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 9.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 7.0 cm |
| Remote | 50 Gs (5.0 mT) | 6.5 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Collisions (kinetic energy) - collision effects
MPL 40x20x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.47 km/h
(6.24 m/s)
|
1.17 J | |
| 30 mm |
35.51 km/h
(9.86 m/s)
|
2.92 J | |
| 50 mm |
45.70 km/h
(12.69 m/s)
|
4.83 J | |
| 100 mm |
64.60 km/h
(17.95 m/s)
|
9.66 J |
Table 9: Anti-corrosion coating durability
MPL 40x20x10 / 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 40x20x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 28 125 Mx | 281.2 µWb |
| Pc Coefficient | 0.42 | Low (Flat) |
Table 11: Submerged application
MPL 40x20x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 24.62 kg | Standard |
| Water (riverbed) |
28.19 kg
(+3.57 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Thermal stability
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.42
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
Pros as well as cons of rare earth magnets.
Advantages
- They do not lose power, even during approximately 10 years – the reduction in power is only ~1% (according to tests),
- They feature excellent resistance to magnetic field loss as a result of external magnetic sources,
- By covering with a smooth layer of gold, the element acquires an professional look,
- The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Possibility of exact modeling and adapting to complex requirements,
- Fundamental importance in electronics industry – they are used in data components, electric motors, medical equipment, and technologically advanced constructions.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also raises their durability
- Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
- We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
- Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these devices can complicate diagnosis medical after entering the body.
- Due to expensive raw materials, their price is relatively high,
Lifting parameters
Maximum magnetic pulling force – what contributes to it?
- on a plate made of mild steel, optimally conducting the magnetic field
- possessing a thickness of minimum 10 mm to ensure full flux closure
- characterized by smoothness
- with direct contact (no coatings)
- under vertical force direction (90-degree angle)
- at ambient temperature approx. 20 degrees Celsius
Determinants of lifting force in real conditions
- Gap between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Angle of force application – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Material composition – not every steel attracts identically. High carbon content worsen the attraction effect.
- Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
- Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.
Warnings
Handling guide
Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.
Finger safety
Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
Health Danger
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.
Impact on smartphones
GPS units and smartphones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.
Data carriers
Powerful magnetic fields can erase data on payment cards, HDDs, and storage devices. Keep a distance of at least 10 cm.
Magnet fragility
Neodymium magnets are ceramic materials, which means they are very brittle. Collision of two magnets will cause them breaking into shards.
Permanent damage
Control the heat. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.
Machining danger
Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.
Sensitization to coating
It is widely known that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact and select encased magnets.
No play value
Always store magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are life-threatening.
