MPL 40x18x10 SH / N38 - lamellar magnet
lamellar magnet
Catalog no 020157
GTIN/EAN: 5906301811633
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
36.29 ZŁ with VAT / pcs + price for transport
29.50 ZŁ net + 23% VAT / pcs
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Physical properties - MPL 40x18x10 SH / N38 - lamellar magnet
Specification / characteristics - MPL 40x18x10 SH / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020157 |
| GTIN/EAN | 5906301811633 |
| 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 |
Physical analysis of the assembly - report
Presented data represent the result of a physical calculation. Results are based on algorithms for the material Nd2Fe14B. Actual conditions may deviate from the simulation results. Treat these data as a reference point for designers.
Table 1: Static pull force (pull vs distance) - interaction chart
MPL 40x18x10 SH / 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 lbs
23810.0 g / 233.6 N
|
critical level |
| 1 mm |
3399 Gs
339.9 mT
|
20.48 kg / 45.14 lbs
20476.1 g / 200.9 N
|
critical level |
| 2 mm |
3120 Gs
312.0 mT
|
17.25 kg / 38.02 lbs
17245.9 g / 169.2 N
|
critical level |
| 3 mm |
2841 Gs
284.1 mT
|
14.30 kg / 31.54 lbs
14304.1 g / 140.3 N
|
critical level |
| 5 mm |
2321 Gs
232.1 mT
|
9.55 kg / 21.05 lbs
9547.8 g / 93.7 N
|
warning |
| 10 mm |
1370 Gs
137.0 mT
|
3.32 kg / 7.33 lbs
3324.4 g / 32.6 N
|
warning |
| 15 mm |
833 Gs
83.3 mT
|
1.23 kg / 2.71 lbs
1229.0 g / 12.1 N
|
weak grip |
| 20 mm |
530 Gs
53.0 mT
|
0.50 kg / 1.10 lbs
498.1 g / 4.9 N
|
weak grip |
| 30 mm |
244 Gs
24.4 mT
|
0.11 kg / 0.23 lbs
105.3 g / 1.0 N
|
weak grip |
| 50 mm |
75 Gs
7.5 mT
|
0.01 kg / 0.02 lbs
9.9 g / 0.1 N
|
weak grip |
Table 2: Sliding capacity (vertical surface)
MPL 40x18x10 SH / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.76 kg / 10.50 lbs
4762.0 g / 46.7 N
|
| 1 mm | Stal (~0.2) |
4.10 kg / 9.03 lbs
4096.0 g / 40.2 N
|
| 2 mm | Stal (~0.2) |
3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
|
| 3 mm | Stal (~0.2) |
2.86 kg / 6.31 lbs
2860.0 g / 28.1 N
|
| 5 mm | Stal (~0.2) |
1.91 kg / 4.21 lbs
1910.0 g / 18.7 N
|
| 10 mm | Stal (~0.2) |
0.66 kg / 1.46 lbs
664.0 g / 6.5 N
|
| 15 mm | Stal (~0.2) |
0.25 kg / 0.54 lbs
246.0 g / 2.4 N
|
| 20 mm | Stal (~0.2) |
0.10 kg / 0.22 lbs
100.0 g / 1.0 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.05 lbs
22.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x18x10 SH / 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 lbs
7143.0 g / 70.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.76 kg / 10.50 lbs
4762.0 g / 46.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.38 kg / 5.25 lbs
2381.0 g / 23.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
11.91 kg / 26.25 lbs
11905.0 g / 116.8 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MPL 40x18x10 SH / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.19 kg / 2.62 lbs
1190.5 g / 11.7 N
|
| 1 mm |
|
2.98 kg / 6.56 lbs
2976.3 g / 29.2 N
|
| 2 mm |
|
5.95 kg / 13.12 lbs
5952.5 g / 58.4 N
|
| 3 mm |
|
8.93 kg / 19.68 lbs
8928.7 g / 87.6 N
|
| 5 mm |
|
14.88 kg / 32.81 lbs
14881.3 g / 146.0 N
|
| 10 mm |
|
23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
|
| 11 mm |
|
23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
|
| 12 mm |
|
23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
|
Table 5: Thermal stability (stability) - resistance threshold
MPL 40x18x10 SH / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
|
OK |
| 40 °C | -2.2% |
23.29 kg / 51.34 lbs
23286.2 g / 228.4 N
|
OK |
| 60 °C | -4.4% |
22.76 kg / 50.18 lbs
22762.4 g / 223.3 N
|
|
| 80 °C | -6.6% |
22.24 kg / 49.03 lbs
22238.5 g / 218.2 N
|
|
| 100 °C | -28.8% |
16.95 kg / 37.37 lbs
16952.7 g / 166.3 N
|
Table 6: Two magnets (attraction) - field range
MPL 40x18x10 SH / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
59.64 kg / 131.49 lbs
5 034 Gs
|
8.95 kg / 19.72 lbs
8947 g / 87.8 N
|
N/A |
| 1 mm |
55.50 kg / 122.35 lbs
7 072 Gs
|
8.32 kg / 18.35 lbs
8325 g / 81.7 N
|
49.95 kg / 110.12 lbs
~0 Gs
|
| 2 mm |
51.29 kg / 113.08 lbs
6 799 Gs
|
7.69 kg / 16.96 lbs
7694 g / 75.5 N
|
46.16 kg / 101.77 lbs
~0 Gs
|
| 3 mm |
47.18 kg / 104.01 lbs
6 520 Gs
|
7.08 kg / 15.60 lbs
7076 g / 69.4 N
|
42.46 kg / 93.61 lbs
~0 Gs
|
| 5 mm |
39.41 kg / 86.88 lbs
5 959 Gs
|
5.91 kg / 13.03 lbs
5912 g / 58.0 N
|
35.47 kg / 78.20 lbs
~0 Gs
|
| 10 mm |
23.92 kg / 52.73 lbs
4 643 Gs
|
3.59 kg / 7.91 lbs
3588 g / 35.2 N
|
21.53 kg / 47.46 lbs
~0 Gs
|
| 20 mm |
8.33 kg / 18.36 lbs
2 739 Gs
|
1.25 kg / 2.75 lbs
1249 g / 12.3 N
|
7.49 kg / 16.52 lbs
~0 Gs
|
| 50 mm |
0.55 kg / 1.22 lbs
705 Gs
|
0.08 kg / 0.18 lbs
83 g / 0.8 N
|
0.50 kg / 1.09 lbs
~0 Gs
|
| 60 mm |
0.26 kg / 0.58 lbs
487 Gs
|
0.04 kg / 0.09 lbs
40 g / 0.4 N
|
0.24 kg / 0.52 lbs
~0 Gs
|
| 70 mm |
0.13 kg / 0.30 lbs
348 Gs
|
0.02 kg / 0.04 lbs
20 g / 0.2 N
|
0.12 kg / 0.27 lbs
~0 Gs
|
| 80 mm |
0.07 kg / 0.16 lbs
256 Gs
|
0.01 kg / 0.02 lbs
11 g / 0.1 N
|
0.07 kg / 0.14 lbs
~0 Gs
|
| 90 mm |
0.04 kg / 0.09 lbs
194 Gs
|
0.01 kg / 0.01 lbs
6 g / 0.1 N
|
0.04 kg / 0.08 lbs
~0 Gs
|
| 100 mm |
0.02 kg / 0.05 lbs
149 Gs
|
0.00 kg / 0.01 lbs
4 g / 0.0 N
|
0.02 kg / 0.05 lbs
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
MPL 40x18x10 SH / 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 |
| Timepiece | 20 Gs (2.0 mT) | 8.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 6.5 cm |
| Remote | 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) - collision effects
MPL 40x18x10 SH / 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 SH / 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 (Pc)
MPL 40x18x10 SH / 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 SH / 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. Wall mount (shear)
*Warning: On a vertical surface, the magnet retains only ~20% of its max power.
2. Plate thickness effect
*Thin steel (e.g. computer case) drastically weakens the holding force.
3. Thermal stability
*For N38 material, the critical limit 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.
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 deals
Strengths as well as weaknesses of rare earth magnets.
Benefits
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
- Magnets effectively defend themselves against demagnetization caused by external fields,
- Thanks to the reflective finish, the layer of Ni-Cu-Ni, gold-plated, or silver-plated gives an clean appearance,
- Magnetic induction on the working layer of the magnet is exceptional,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Considering the potential of flexible forming and customization to individualized projects, magnetic components can be modeled in a broad palette of shapes and sizes, which makes them more universal,
- Significant place in modern industrial fields – they are commonly used in hard drives, electric drive systems, medical equipment, also industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in compact constructions
Cons
- Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 extremely resistant to heat
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating threads and complex shapes in magnets, we recommend using cover - magnetic mount.
- Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
- With large orders the cost of neodymium magnets is economically unviable,
Holding force characteristics
Maximum lifting force for a neodymium magnet – what affects it?
- using a base made of high-permeability steel, acting as a magnetic yoke
- whose thickness reaches at least 10 mm
- with a plane free of scratches
- without any clearance between the magnet and steel
- during pulling in a direction vertical to the plane
- at conditions approx. 20°C
Magnet lifting force in use – key factors
- Distance (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
- Direction of force – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Plate material – low-carbon steel attracts best. Higher carbon content reduce magnetic permeability and holding force.
- Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.
Precautions when working with neodymium magnets
Data carriers
Avoid bringing magnets near a purse, computer, or screen. The magnetism can destroy these devices and wipe information from cards.
Conscious usage
Exercise caution. Neodymium magnets act from a long distance and connect with massive power, often quicker than you can react.
Allergy Warning
Nickel alert: The nickel-copper-nickel coating contains nickel. If redness happens, cease handling magnets and use protective gear.
GPS Danger
Remember: neodymium magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, device, and GPS.
Life threat
For implant holders: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or request help to handle the magnets.
Danger to the youngest
Strictly keep magnets out of reach of children. Ingestion danger is significant, and the effects of magnets connecting inside the body are tragic.
Do not overheat magnets
Keep cool. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).
Flammability
Machining of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Fragile material
Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets leads to them cracking into shards.
Crushing risk
Big blocks can smash fingers instantly. Under no circumstances put your hand between two strong magnets.
