MPL 40x18x10 / N38 - lamellar magnet
lamellar magnet
Catalog no 020156
GTIN/EAN: 5906301811626
length
40 mm [±0,1 mm]
Width
18 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
54 g
Magnetization Direction
↑ axial
Load capacity
23.81 kg / 233.58 N
Magnetic Induction
366.66 mT / 3667 Gs
Coating
[NiCuNi] Nickel
30.75 ZŁ with VAT / pcs + price for transport
25.00 ZŁ net + 23% VAT / pcs
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Technical - MPL 40x18x10 / N38 - lamellar magnet
Specification / characteristics - MPL 40x18x10 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020156 |
| GTIN/EAN | 5906301811626 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 40 mm [±0,1 mm] |
| Width | 18 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 54 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 23.81 kg / 233.58 N |
| Magnetic Induction ~ ? | 366.66 mT / 3667 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 modeling of the magnet - technical parameters
The following values are the direct effect of a engineering simulation. Results rely on algorithms for the class Nd2Fe14B. Real-world performance may differ. Please consider these data as a reference point during assembly planning.
Table 1: Static force (pull vs distance) - power drop
MPL 40x18x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3666 Gs
366.6 mT
|
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
|
critical level |
| 1 mm |
3399 Gs
339.9 mT
|
20.48 kg / 45.14 pounds
20476.1 g / 200.9 N
|
critical level |
| 2 mm |
3120 Gs
312.0 mT
|
17.25 kg / 38.02 pounds
17245.9 g / 169.2 N
|
critical level |
| 3 mm |
2841 Gs
284.1 mT
|
14.30 kg / 31.54 pounds
14304.1 g / 140.3 N
|
critical level |
| 5 mm |
2321 Gs
232.1 mT
|
9.55 kg / 21.05 pounds
9547.8 g / 93.7 N
|
strong |
| 10 mm |
1370 Gs
137.0 mT
|
3.32 kg / 7.33 pounds
3324.4 g / 32.6 N
|
strong |
| 15 mm |
833 Gs
83.3 mT
|
1.23 kg / 2.71 pounds
1229.0 g / 12.1 N
|
safe |
| 20 mm |
530 Gs
53.0 mT
|
0.50 kg / 1.10 pounds
498.1 g / 4.9 N
|
safe |
| 30 mm |
244 Gs
24.4 mT
|
0.11 kg / 0.23 pounds
105.3 g / 1.0 N
|
safe |
| 50 mm |
75 Gs
7.5 mT
|
0.01 kg / 0.02 pounds
9.9 g / 0.1 N
|
safe |
Table 2: Slippage capacity (wall)
MPL 40x18x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.76 kg / 10.50 pounds
4762.0 g / 46.7 N
|
| 1 mm | Stal (~0.2) |
4.10 kg / 9.03 pounds
4096.0 g / 40.2 N
|
| 2 mm | Stal (~0.2) |
3.45 kg / 7.61 pounds
3450.0 g / 33.8 N
|
| 3 mm | Stal (~0.2) |
2.86 kg / 6.31 pounds
2860.0 g / 28.1 N
|
| 5 mm | Stal (~0.2) |
1.91 kg / 4.21 pounds
1910.0 g / 18.7 N
|
| 10 mm | Stal (~0.2) |
0.66 kg / 1.46 pounds
664.0 g / 6.5 N
|
| 15 mm | Stal (~0.2) |
0.25 kg / 0.54 pounds
246.0 g / 2.4 N
|
| 20 mm | Stal (~0.2) |
0.10 kg / 0.22 pounds
100.0 g / 1.0 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.05 pounds
22.0 g / 0.2 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 40x18x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
7.14 kg / 15.75 pounds
7143.0 g / 70.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.76 kg / 10.50 pounds
4762.0 g / 46.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.38 kg / 5.25 pounds
2381.0 g / 23.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
11.91 kg / 26.25 pounds
11905.0 g / 116.8 N
|
Table 4: Material efficiency (saturation) - power losses
MPL 40x18x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.19 kg / 2.62 pounds
1190.5 g / 11.7 N
|
| 1 mm |
|
2.98 kg / 6.56 pounds
2976.3 g / 29.2 N
|
| 2 mm |
|
5.95 kg / 13.12 pounds
5952.5 g / 58.4 N
|
| 3 mm |
|
8.93 kg / 19.68 pounds
8928.7 g / 87.6 N
|
| 5 mm |
|
14.88 kg / 32.81 pounds
14881.3 g / 146.0 N
|
| 10 mm |
|
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
|
| 11 mm |
|
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
|
| 12 mm |
|
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
|
Table 5: Thermal resistance (stability) - thermal limit
MPL 40x18x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
|
OK |
| 40 °C | -2.2% |
23.29 kg / 51.34 pounds
23286.2 g / 228.4 N
|
OK |
| 60 °C | -4.4% |
22.76 kg / 50.18 pounds
22762.4 g / 223.3 N
|
|
| 80 °C | -6.6% |
22.24 kg / 49.03 pounds
22238.5 g / 218.2 N
|
|
| 100 °C | -28.8% |
16.95 kg / 37.37 pounds
16952.7 g / 166.3 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 40x18x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
59.64 kg / 131.49 pounds
5 034 Gs
|
8.95 kg / 19.72 pounds
8947 g / 87.8 N
|
N/A |
| 1 mm |
55.50 kg / 122.35 pounds
7 072 Gs
|
8.32 kg / 18.35 pounds
8325 g / 81.7 N
|
49.95 kg / 110.12 pounds
~0 Gs
|
| 2 mm |
51.29 kg / 113.08 pounds
6 799 Gs
|
7.69 kg / 16.96 pounds
7694 g / 75.5 N
|
46.16 kg / 101.77 pounds
~0 Gs
|
| 3 mm |
47.18 kg / 104.01 pounds
6 520 Gs
|
7.08 kg / 15.60 pounds
7076 g / 69.4 N
|
42.46 kg / 93.61 pounds
~0 Gs
|
| 5 mm |
39.41 kg / 86.88 pounds
5 959 Gs
|
5.91 kg / 13.03 pounds
5912 g / 58.0 N
|
35.47 kg / 78.20 pounds
~0 Gs
|
| 10 mm |
23.92 kg / 52.73 pounds
4 643 Gs
|
3.59 kg / 7.91 pounds
3588 g / 35.2 N
|
21.53 kg / 47.46 pounds
~0 Gs
|
| 20 mm |
8.33 kg / 18.36 pounds
2 739 Gs
|
1.25 kg / 2.75 pounds
1249 g / 12.3 N
|
7.49 kg / 16.52 pounds
~0 Gs
|
| 50 mm |
0.55 kg / 1.22 pounds
705 Gs
|
0.08 kg / 0.18 pounds
83 g / 0.8 N
|
0.50 kg / 1.09 pounds
~0 Gs
|
| 60 mm |
0.26 kg / 0.58 pounds
487 Gs
|
0.04 kg / 0.09 pounds
40 g / 0.4 N
|
0.24 kg / 0.52 pounds
~0 Gs
|
| 70 mm |
0.13 kg / 0.30 pounds
348 Gs
|
0.02 kg / 0.04 pounds
20 g / 0.2 N
|
0.12 kg / 0.27 pounds
~0 Gs
|
| 80 mm |
0.07 kg / 0.16 pounds
256 Gs
|
0.01 kg / 0.02 pounds
11 g / 0.1 N
|
0.07 kg / 0.14 pounds
~0 Gs
|
| 90 mm |
0.04 kg / 0.09 pounds
194 Gs
|
0.01 kg / 0.01 pounds
6 g / 0.1 N
|
0.04 kg / 0.08 pounds
~0 Gs
|
| 100 mm |
0.02 kg / 0.05 pounds
149 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
Table 7: Hazards (electronics) - precautionary measures
MPL 40x18x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 14.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 11.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 8.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 6.5 cm |
| Car key | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Dynamics (kinetic energy) - warning
MPL 40x18x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.95 km/h
(6.38 m/s)
|
1.10 J | |
| 30 mm |
36.78 km/h
(10.22 m/s)
|
2.82 J | |
| 50 mm |
47.37 km/h
(13.16 m/s)
|
4.67 J | |
| 100 mm |
66.97 km/h
(18.60 m/s)
|
9.34 J |
Table 9: Anti-corrosion coating durability
MPL 40x18x10 / 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 40x18x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 26 060 Mx | 260.6 µWb |
| Pc Coefficient | 0.43 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 40x18x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 23.81 kg | Standard |
| Water (riverbed) |
27.26 kg
(+3.45 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Caution: On a vertical wall, the magnet retains only a fraction of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Thermal stability
*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) = 0.43
The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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 offers
Advantages as well as disadvantages of rare earth magnets.
Strengths
- They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
- They feature excellent resistance to weakening of magnetic properties due to external magnetic sources,
- A magnet with a smooth gold surface has better aesthetics,
- The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
- 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...
- Due to the potential of accurate molding and adaptation to individualized requirements, neodymium magnets can be created in a variety of shapes and sizes, which expands the range of possible applications,
- Universal use in high-tech industry – they are utilized in mass storage devices, brushless drives, diagnostic systems, as well as complex engineering applications.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Limitations
- To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We suggest casing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex shapes.
- Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these products are able to complicate diagnosis medical after entering the body.
- Due to neodymium price, their price is relatively high,
Holding force characteristics
Magnetic strength at its maximum – what affects it?
- on a block made of mild steel, effectively closing the magnetic flux
- whose transverse dimension equals approx. 10 mm
- characterized by lack of roughness
- without the slightest insulating layer between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- at room temperature
Determinants of lifting force in real conditions
- Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
- Pull-off angle – 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 – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
- Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
- Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.
Safety rules for work with NdFeB magnets
Mechanical processing
Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.
Maximum temperature
Keep cool. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).
Life threat
Patients with a pacemaker must keep an absolute distance from magnets. The magnetism can stop the functioning of the implant.
Impact on smartphones
GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.
Protect data
Powerful magnetic fields can destroy records on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.
Material brittleness
Neodymium magnets are sintered ceramics, which means they are very brittle. Clashing of two magnets will cause them breaking into small pieces.
Hand protection
Risk of injury: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.
Swallowing risk
Strictly store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are very dangerous.
Immense force
Handle magnets with awareness. Their powerful strength can shock even experienced users. Be vigilant and do not underestimate their power.
Allergic reactions
Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation appears, immediately stop working with magnets and use protective gear.
