MPL 40x10x4 / N38 - lamellar magnet
lamellar magnet
Catalog no 020150
GTIN/EAN: 5906301811565
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
12 g
Magnetization Direction
↑ axial
Load capacity
9.31 kg / 91.33 N
Magnetic Induction
275.57 mT / 2756 Gs
Coating
[NiCuNi] Nickel
4.87 ZŁ with VAT / pcs + price for transport
3.96 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical details - MPL 40x10x4 / N38 - lamellar magnet
Specification / characteristics - MPL 40x10x4 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020150 |
| GTIN/EAN | 5906301811565 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 40 mm [±0,1 mm] |
| Width | 10 mm [±0,1 mm] |
| Height | 4 mm [±0,1 mm] |
| Weight | 12 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 9.31 kg / 91.33 N |
| Magnetic Induction ~ ? | 275.57 mT / 2756 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 |
Engineering simulation of the product - report
The following values represent the direct effect of a mathematical analysis. Values are based on algorithms for the material Nd2Fe14B. Operational parameters may differ. Please consider these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs distance) - interaction chart
MPL 40x10x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2755 Gs
275.5 mT
|
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
|
warning |
| 1 mm |
2413 Gs
241.3 mT
|
7.14 kg / 15.75 pounds
7143.1 g / 70.1 N
|
warning |
| 2 mm |
2044 Gs
204.4 mT
|
5.13 kg / 11.31 pounds
5128.9 g / 50.3 N
|
warning |
| 3 mm |
1703 Gs
170.3 mT
|
3.56 kg / 7.85 pounds
3559.5 g / 34.9 N
|
warning |
| 5 mm |
1173 Gs
117.3 mT
|
1.69 kg / 3.72 pounds
1688.2 g / 16.6 N
|
low risk |
| 10 mm |
522 Gs
52.2 mT
|
0.33 kg / 0.74 pounds
334.9 g / 3.3 N
|
low risk |
| 15 mm |
277 Gs
27.7 mT
|
0.09 kg / 0.21 pounds
94.2 g / 0.9 N
|
low risk |
| 20 mm |
163 Gs
16.3 mT
|
0.03 kg / 0.07 pounds
32.8 g / 0.3 N
|
low risk |
| 30 mm |
69 Gs
6.9 mT
|
0.01 kg / 0.01 pounds
5.8 g / 0.1 N
|
low risk |
| 50 mm |
19 Gs
1.9 mT
|
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
|
low risk |
Table 2: Vertical force (vertical surface)
MPL 40x10x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.86 kg / 4.11 pounds
1862.0 g / 18.3 N
|
| 1 mm | Stal (~0.2) |
1.43 kg / 3.15 pounds
1428.0 g / 14.0 N
|
| 2 mm | Stal (~0.2) |
1.03 kg / 2.26 pounds
1026.0 g / 10.1 N
|
| 3 mm | Stal (~0.2) |
0.71 kg / 1.57 pounds
712.0 g / 7.0 N
|
| 5 mm | Stal (~0.2) |
0.34 kg / 0.75 pounds
338.0 g / 3.3 N
|
| 10 mm | Stal (~0.2) |
0.07 kg / 0.15 pounds
66.0 g / 0.6 N
|
| 15 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
18.0 g / 0.2 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 40x10x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.79 kg / 6.16 pounds
2793.0 g / 27.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.86 kg / 4.11 pounds
1862.0 g / 18.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.93 kg / 2.05 pounds
931.0 g / 9.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
4.66 kg / 10.26 pounds
4655.0 g / 45.7 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 40x10x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.93 kg / 2.05 pounds
931.0 g / 9.1 N
|
| 1 mm |
|
2.33 kg / 5.13 pounds
2327.5 g / 22.8 N
|
| 2 mm |
|
4.66 kg / 10.26 pounds
4655.0 g / 45.7 N
|
| 3 mm |
|
6.98 kg / 15.39 pounds
6982.5 g / 68.5 N
|
| 5 mm |
|
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
|
| 10 mm |
|
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
|
| 11 mm |
|
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
|
| 12 mm |
|
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
|
Table 5: Working in heat (stability) - thermal limit
MPL 40x10x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
|
OK |
| 40 °C | -2.2% |
9.11 kg / 20.07 pounds
9105.2 g / 89.3 N
|
OK |
| 60 °C | -4.4% |
8.90 kg / 19.62 pounds
8900.4 g / 87.3 N
|
|
| 80 °C | -6.6% |
8.70 kg / 19.17 pounds
8695.5 g / 85.3 N
|
|
| 100 °C | -28.8% |
6.63 kg / 14.61 pounds
6628.7 g / 65.0 N
|
Table 6: Two magnets (attraction) - forces in the system
MPL 40x10x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
18.71 kg / 41.25 pounds
4 164 Gs
|
2.81 kg / 6.19 pounds
2807 g / 27.5 N
|
N/A |
| 1 mm |
16.57 kg / 36.53 pounds
5 185 Gs
|
2.49 kg / 5.48 pounds
2486 g / 24.4 N
|
14.91 kg / 32.88 pounds
~0 Gs
|
| 2 mm |
14.36 kg / 31.65 pounds
4 826 Gs
|
2.15 kg / 4.75 pounds
2153 g / 21.1 N
|
12.92 kg / 28.48 pounds
~0 Gs
|
| 3 mm |
12.24 kg / 26.98 pounds
4 455 Gs
|
1.84 kg / 4.05 pounds
1836 g / 18.0 N
|
11.01 kg / 24.28 pounds
~0 Gs
|
| 5 mm |
8.61 kg / 18.98 pounds
3 737 Gs
|
1.29 kg / 2.85 pounds
1291 g / 12.7 N
|
7.75 kg / 17.08 pounds
~0 Gs
|
| 10 mm |
3.39 kg / 7.48 pounds
2 346 Gs
|
0.51 kg / 1.12 pounds
509 g / 5.0 N
|
3.05 kg / 6.73 pounds
~0 Gs
|
| 20 mm |
0.67 kg / 1.48 pounds
1 045 Gs
|
0.10 kg / 0.22 pounds
101 g / 1.0 N
|
0.61 kg / 1.34 pounds
~0 Gs
|
| 50 mm |
0.03 kg / 0.06 pounds
207 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
| 60 mm |
0.01 kg / 0.03 pounds
138 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.02 pounds
~0 Gs
|
| 70 mm |
0.01 kg / 0.01 pounds
96 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.01 pounds
69 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
51 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
39 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MPL 40x10x4 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 8.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 6.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 5.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 4.0 cm |
| Remote | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (cracking risk) - collision effects
MPL 40x10x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
28.72 km/h
(7.98 m/s)
|
0.38 J | |
| 30 mm |
48.67 km/h
(13.52 m/s)
|
1.10 J | |
| 50 mm |
62.82 km/h
(17.45 m/s)
|
1.83 J | |
| 100 mm |
88.83 km/h
(24.68 m/s)
|
3.65 J |
Table 9: Surface protection spec
MPL 40x10x4 / 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 40x10x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 9 840 Mx | 98.4 µWb |
| Pc Coefficient | 0.26 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 40x10x4 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 9.31 kg | Standard |
| Water (riverbed) |
10.66 kg
(+1.35 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical surface, the magnet retains just a fraction of its max power.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Temperature resistance
*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) = 0.26
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 |
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Pros as well as cons of neodymium magnets.
Advantages
- They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
- They have excellent resistance to magnetic field loss due to opposing magnetic fields,
- In other words, due to the glossy surface of silver, the element looks attractive,
- Magnetic induction on the working layer of the magnet turns out to be impressive,
- 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...
- In view of the possibility of accurate shaping and customization to individualized needs, magnetic components can be modeled in a wide range of forms and dimensions, which amplifies use scope,
- Universal use in modern industrial fields – they find application in hard drives, brushless drives, medical equipment, also modern systems.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Disadvantages
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
- Neodymium magnets lose 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 durability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- Due to limitations in realizing nuts and complicated forms in magnets, we propose using casing - magnetic mount.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which gains importance in the context of child safety. Additionally, small elements of these products are able to complicate diagnosis medical in case of swallowing.
- Due to complex production process, their price is relatively high,
Pull force analysis
Maximum holding power of the magnet – what affects it?
- with the contact of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- with a thickness no less than 10 mm
- with an ideally smooth contact surface
- without any insulating layer between the magnet and steel
- during pulling in a direction perpendicular to the mounting surface
- in neutral thermal conditions
Key elements affecting lifting force
- Air gap (between the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
- Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Substrate 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. Alloy additives weaken the attraction effect.
- Surface quality – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet’s surface and the plate decreases the load capacity.
Precautions when working with neodymium magnets
Serious injuries
Large magnets can smash fingers in a fraction of a second. Never put your hand between two attracting surfaces.
Magnet fragility
Protect your eyes. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.
Conscious usage
Exercise caution. Rare earth magnets act from a distance and connect with huge force, often quicker than you can move away.
Compass and GPS
An intense magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Do not bring magnets near a device to prevent breaking the sensors.
ICD Warning
Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.
Danger to the youngest
Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Store away from kids and pets.
Do not drill into magnets
Machining of NdFeB material poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
Warning for allergy sufferers
Some people have a sensitization to nickel, which is the common plating for NdFeB magnets. Extended handling can result in dermatitis. It is best to use safety gloves.
Protect data
Do not bring magnets near a wallet, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Power loss in heat
Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.
