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
bulk discounts:
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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 |
Technical simulation of the product - data
These data constitute the result of a mathematical analysis. Results were calculated on models for the material Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Use these data as a preliminary roadmap for designers.
Table 1: Static pull force (pull vs distance) - interaction chart
MPL 40x18x10 SH / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
3666 Gs
366.6 mT
|
23.81 kg / 23810.0 g
233.6 N
|
critical level |
| 1 mm |
3399 Gs
339.9 mT
|
20.48 kg / 20476.1 g
200.9 N
|
critical level |
| 2 mm |
3120 Gs
312.0 mT
|
17.25 kg / 17245.9 g
169.2 N
|
critical level |
| 3 mm |
2841 Gs
284.1 mT
|
14.30 kg / 14304.1 g
140.3 N
|
critical level |
| 5 mm |
2321 Gs
232.1 mT
|
9.55 kg / 9547.8 g
93.7 N
|
warning |
| 10 mm |
1370 Gs
137.0 mT
|
3.32 kg / 3324.4 g
32.6 N
|
warning |
| 15 mm |
833 Gs
83.3 mT
|
1.23 kg / 1229.0 g
12.1 N
|
low risk |
| 20 mm |
530 Gs
53.0 mT
|
0.50 kg / 498.1 g
4.9 N
|
low risk |
| 30 mm |
244 Gs
24.4 mT
|
0.11 kg / 105.3 g
1.0 N
|
low risk |
| 50 mm |
75 Gs
7.5 mT
|
0.01 kg / 9.9 g
0.1 N
|
low risk |
Table 2: Slippage hold (wall)
MPL 40x18x10 SH / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.76 kg / 4762.0 g
46.7 N
|
| 1 mm | Stal (~0.2) |
4.10 kg / 4096.0 g
40.2 N
|
| 2 mm | Stal (~0.2) |
3.45 kg / 3450.0 g
33.8 N
|
| 3 mm | Stal (~0.2) |
2.86 kg / 2860.0 g
28.1 N
|
| 5 mm | Stal (~0.2) |
1.91 kg / 1910.0 g
18.7 N
|
| 10 mm | Stal (~0.2) |
0.66 kg / 664.0 g
6.5 N
|
| 15 mm | Stal (~0.2) |
0.25 kg / 246.0 g
2.4 N
|
| 20 mm | Stal (~0.2) |
0.10 kg / 100.0 g
1.0 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 22.0 g
0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
Table 3: Wall mounting (shearing) - vertical pull
MPL 40x18x10 SH / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
7.14 kg / 7143.0 g
70.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.76 kg / 4762.0 g
46.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.38 kg / 2381.0 g
23.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
11.91 kg / 11905.0 g
116.8 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 40x18x10 SH / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
1.19 kg / 1190.5 g
11.7 N
|
| 1 mm |
|
2.98 kg / 2976.3 g
29.2 N
|
| 2 mm |
|
5.95 kg / 5952.5 g
58.4 N
|
| 5 mm |
|
14.88 kg / 14881.3 g
146.0 N
|
| 10 mm |
|
23.81 kg / 23810.0 g
233.6 N
|
Table 5: Thermal resistance (material behavior) - power drop
MPL 40x18x10 SH / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
23.81 kg / 23810.0 g
233.6 N
|
OK |
| 40 °C | -2.2% |
23.29 kg / 23286.2 g
228.4 N
|
OK |
| 60 °C | -4.4% |
22.76 kg / 22762.4 g
223.3 N
|
|
| 80 °C | -6.6% |
22.24 kg / 22238.5 g
218.2 N
|
|
| 100 °C | -28.8% |
16.95 kg / 16952.7 g
166.3 N
|
Table 6: Two magnets (repulsion) - field range
MPL 40x18x10 SH / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
59.64 kg / 59645 g
585.1 N
5 034 Gs
|
N/A |
| 1 mm |
55.50 kg / 55499 g
544.4 N
7 072 Gs
|
49.95 kg / 49949 g
490.0 N
~0 Gs
|
| 2 mm |
51.29 kg / 51293 g
503.2 N
6 799 Gs
|
46.16 kg / 46164 g
452.9 N
~0 Gs
|
| 3 mm |
47.18 kg / 47176 g
462.8 N
6 520 Gs
|
42.46 kg / 42459 g
416.5 N
~0 Gs
|
| 5 mm |
39.41 kg / 39410 g
386.6 N
5 959 Gs
|
35.47 kg / 35469 g
348.0 N
~0 Gs
|
| 10 mm |
23.92 kg / 23918 g
234.6 N
4 643 Gs
|
21.53 kg / 21526 g
211.2 N
~0 Gs
|
| 20 mm |
8.33 kg / 8328 g
81.7 N
2 739 Gs
|
7.49 kg / 7495 g
73.5 N
~0 Gs
|
| 50 mm |
0.55 kg / 552 g
5.4 N
705 Gs
|
0.50 kg / 497 g
4.9 N
~0 Gs
|
Table 7: Protective zones (electronics) - 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 |
| Mechanical watch | 20 Gs (2.0 mT) | 8.5 cm |
| Mobile device | 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: Impact energy (cracking risk) - 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: Corrosion resistance
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: Electrical 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: Hydrostatics and buoyancy
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)
*Note: On a vertical wall, the magnet retains just ~20% of its max power.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.
3. Power loss vs temp
*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) = 0.43
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 |
Other deals
Pros and cons of Nd2Fe14B magnets.
Pros
- They retain full power for almost 10 years – the loss is just ~1% (based on simulations),
- Magnets very well protect themselves against loss of magnetization caused by ambient magnetic noise,
- The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- Magnetic induction on the working layer of the magnet remains very high,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Due to the possibility of precise shaping and adaptation to unique projects, neodymium magnets can be manufactured in a broad palette of forms and dimensions, which expands the range of possible applications,
- Fundamental importance in modern technologies – they serve a role in computer drives, brushless drives, diagnostic systems, and modern systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in compact constructions
Weaknesses
- 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.
- Neodymium magnets decrease their power 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 stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
- We suggest cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex shapes.
- Health risk to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
- Due to neodymium price, their price is higher than average,
Lifting parameters
Highest magnetic holding force – what it depends on?
- with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
- with a cross-section minimum 10 mm
- with a plane cleaned and smooth
- without the slightest clearance between the magnet and steel
- during pulling in a direction perpendicular to the mounting surface
- at conditions approx. 20°C
Determinants of practical lifting force of a magnet
- Space between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Steel grade – the best choice is pure iron steel. Cast iron may attract less.
- Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
- Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate lowers the load capacity.
Safety rules for work with NdFeB magnets
Sensitization to coating
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If redness happens, cease handling magnets and wear gloves.
Hand protection
Danger of trauma: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.
Operating temperature
Monitor thermal conditions. Heating the magnet to high heat will ruin its properties and pulling force.
Implant safety
Patients with a pacemaker have to maintain an safe separation from magnets. The magnetic field can disrupt the operation of the life-saving device.
Electronic hazard
Data protection: Neodymium magnets can damage data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).
Powerful field
Handle with care. Neodymium magnets attract from a long distance and connect with huge force, often quicker than you can move away.
Mechanical processing
Dust generated during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
This is not a toy
Neodymium magnets are not suitable for play. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.
Magnets are brittle
Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets will cause them cracking into small pieces.
Keep away from electronics
Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.
