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
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Technical - 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 |
Physical simulation of the product - technical parameters
The following data are the direct effect of a physical analysis. Results rely on models for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Use these data as a reference point during assembly planning.
Table 1: Static pull force (pull vs gap) - interaction chart
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 LBS
24620.0 g / 241.5 N
|
crushing |
| 1 mm |
3272 Gs
327.2 mT
|
21.58 kg / 47.57 LBS
21578.0 g / 211.7 N
|
crushing |
| 2 mm |
3035 Gs
303.5 mT
|
18.56 kg / 40.92 LBS
18559.3 g / 182.1 N
|
crushing |
| 3 mm |
2794 Gs
279.4 mT
|
15.73 kg / 34.69 LBS
15733.0 g / 154.3 N
|
crushing |
| 5 mm |
2332 Gs
233.2 mT
|
10.96 kg / 24.16 LBS
10959.2 g / 107.5 N
|
crushing |
| 10 mm |
1433 Gs
143.3 mT
|
4.14 kg / 9.12 LBS
4136.4 g / 40.6 N
|
medium risk |
| 15 mm |
891 Gs
89.1 mT
|
1.60 kg / 3.52 LBS
1598.7 g / 15.7 N
|
weak grip |
| 20 mm |
574 Gs
57.4 mT
|
0.66 kg / 1.46 LBS
664.0 g / 6.5 N
|
weak grip |
| 30 mm |
267 Gs
26.7 mT
|
0.14 kg / 0.32 LBS
143.7 g / 1.4 N
|
weak grip |
| 50 mm |
82 Gs
8.2 mT
|
0.01 kg / 0.03 LBS
13.7 g / 0.1 N
|
weak grip |
Table 2: Sliding force (vertical surface)
MPL 40x20x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.92 kg / 10.86 LBS
4924.0 g / 48.3 N
|
| 1 mm | Stal (~0.2) |
4.32 kg / 9.52 LBS
4316.0 g / 42.3 N
|
| 2 mm | Stal (~0.2) |
3.71 kg / 8.18 LBS
3712.0 g / 36.4 N
|
| 3 mm | Stal (~0.2) |
3.15 kg / 6.94 LBS
3146.0 g / 30.9 N
|
| 5 mm | Stal (~0.2) |
2.19 kg / 4.83 LBS
2192.0 g / 21.5 N
|
| 10 mm | Stal (~0.2) |
0.83 kg / 1.83 LBS
828.0 g / 8.1 N
|
| 15 mm | Stal (~0.2) |
0.32 kg / 0.71 LBS
320.0 g / 3.1 N
|
| 20 mm | Stal (~0.2) |
0.13 kg / 0.29 LBS
132.0 g / 1.3 N
|
| 30 mm | Stal (~0.2) |
0.03 kg / 0.06 LBS
28.0 g / 0.3 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
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 LBS
7386.0 g / 72.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.92 kg / 10.86 LBS
4924.0 g / 48.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.46 kg / 5.43 LBS
2462.0 g / 24.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
12.31 kg / 27.14 LBS
12310.0 g / 120.8 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MPL 40x20x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.23 kg / 2.71 LBS
1231.0 g / 12.1 N
|
| 1 mm |
|
3.08 kg / 6.78 LBS
3077.5 g / 30.2 N
|
| 2 mm |
|
6.16 kg / 13.57 LBS
6155.0 g / 60.4 N
|
| 3 mm |
|
9.23 kg / 20.35 LBS
9232.5 g / 90.6 N
|
| 5 mm |
|
15.39 kg / 33.92 LBS
15387.5 g / 151.0 N
|
| 10 mm |
|
24.62 kg / 54.28 LBS
24620.0 g / 241.5 N
|
| 11 mm |
|
24.62 kg / 54.28 LBS
24620.0 g / 241.5 N
|
| 12 mm |
|
24.62 kg / 54.28 LBS
24620.0 g / 241.5 N
|
Table 5: Thermal resistance (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 LBS
24620.0 g / 241.5 N
|
OK |
| 40 °C | -2.2% |
24.08 kg / 53.08 LBS
24078.4 g / 236.2 N
|
OK |
| 60 °C | -4.4% |
23.54 kg / 51.89 LBS
23536.7 g / 230.9 N
|
|
| 80 °C | -6.6% |
23.00 kg / 50.70 LBS
22995.1 g / 225.6 N
|
|
| 100 °C | -28.8% |
17.53 kg / 38.65 LBS
17529.4 g / 172.0 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 40x20x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
60.25 kg / 132.83 LBS
4 926 Gs
|
9.04 kg / 19.93 LBS
9038 g / 88.7 N
|
N/A |
| 1 mm |
56.58 kg / 124.73 LBS
6 774 Gs
|
8.49 kg / 18.71 LBS
8487 g / 83.3 N
|
50.92 kg / 112.26 LBS
~0 Gs
|
| 2 mm |
52.81 kg / 116.42 LBS
6 544 Gs
|
7.92 kg / 17.46 LBS
7921 g / 77.7 N
|
47.53 kg / 104.78 LBS
~0 Gs
|
| 3 mm |
49.07 kg / 108.19 LBS
6 309 Gs
|
7.36 kg / 16.23 LBS
7361 g / 72.2 N
|
44.17 kg / 97.37 LBS
~0 Gs
|
| 5 mm |
41.89 kg / 92.34 LBS
5 828 Gs
|
6.28 kg / 13.85 LBS
6283 g / 61.6 N
|
37.70 kg / 83.11 LBS
~0 Gs
|
| 10 mm |
26.82 kg / 59.13 LBS
4 664 Gs
|
4.02 kg / 8.87 LBS
4023 g / 39.5 N
|
24.14 kg / 53.22 LBS
~0 Gs
|
| 20 mm |
10.12 kg / 22.32 LBS
2 865 Gs
|
1.52 kg / 3.35 LBS
1518 g / 14.9 N
|
9.11 kg / 20.09 LBS
~0 Gs
|
| 50 mm |
0.73 kg / 1.61 LBS
769 Gs
|
0.11 kg / 0.24 LBS
109 g / 1.1 N
|
0.66 kg / 1.45 LBS
~0 Gs
|
| 60 mm |
0.35 kg / 0.78 LBS
534 Gs
|
0.05 kg / 0.12 LBS
53 g / 0.5 N
|
0.32 kg / 0.70 LBS
~0 Gs
|
| 70 mm |
0.18 kg / 0.40 LBS
383 Gs
|
0.03 kg / 0.06 LBS
27 g / 0.3 N
|
0.16 kg / 0.36 LBS
~0 Gs
|
| 80 mm |
0.10 kg / 0.22 LBS
282 Gs
|
0.01 kg / 0.03 LBS
15 g / 0.1 N
|
0.09 kg / 0.20 LBS
~0 Gs
|
| 90 mm |
0.06 kg / 0.12 LBS
214 Gs
|
0.01 kg / 0.02 LBS
8 g / 0.1 N
|
0.05 kg / 0.11 LBS
~0 Gs
|
| 100 mm |
0.03 kg / 0.07 LBS
165 Gs
|
0.01 kg / 0.01 LBS
5 g / 0.0 N
|
0.03 kg / 0.07 LBS
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
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 |
| Timepiece | 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 (cracking risk) - warning
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: Corrosion resistance
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: Electrical 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: Physics of underwater searching
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. Vertical hold
*Note: On a vertical wall, the magnet holds only ~20% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. computer case) severely limits the holding force.
3. Temperature resistance
*For N38 grade, the critical limit 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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Check out also proposals
Advantages and disadvantages of neodymium magnets.
Pros
- They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
- They feature excellent resistance to magnetic field loss when exposed to external fields,
- Thanks to the metallic finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
- Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Possibility of individual modeling and adjusting to individual needs,
- Fundamental importance in modern technologies – they are utilized in data components, electric drive systems, medical devices, also modern systems.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Cons
- Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in producing threads and complicated forms in magnets, we recommend using cover - magnetic mechanism.
- Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these magnets can complicate diagnosis medical in case of swallowing.
- 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 it depends on?
- on a base made of mild steel, optimally conducting the magnetic flux
- whose transverse dimension equals approx. 10 mm
- characterized by lack of roughness
- without the slightest clearance between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- in temp. approx. 20°C
Lifting capacity in real conditions – factors
- Air gap (betwixt the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, corrosion or dirt).
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Steel type – low-carbon steel gives the best results. Alloy admixtures decrease magnetic permeability and holding force.
- Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate decreases the load capacity.
H&S for magnets
Electronic devices
Intense magnetic fields can destroy records on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.
Dust is flammable
Fire hazard: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.
Swallowing risk
Product intended for adults. Tiny parts can be swallowed, leading to severe trauma. Keep out of reach of children and animals.
Permanent damage
Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.
Warning for heart patients
People with a heart stimulator have to maintain an absolute distance from magnets. The magnetic field can interfere with the operation of the life-saving device.
Physical harm
Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!
Avoid contact if allergic
Studies show that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent direct skin contact or choose encased magnets.
Keep away from electronics
A strong magnetic field interferes with the functioning of compasses in phones and GPS navigation. Do not bring magnets close to a device to prevent breaking the sensors.
Material brittleness
Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.
Do not underestimate power
Use magnets with awareness. Their immense force can shock even experienced users. Be vigilant and respect their force.
