MPL 40x10x4x2[7/3.5] / N38 - lamellar magnet
lamellar magnet
Catalog no 020151
GTIN/EAN: 5906301811572
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
9.21 ZŁ with VAT / pcs + price for transport
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Detailed specification - MPL 40x10x4x2[7/3.5] / N38 - lamellar magnet
Specification / characteristics - MPL 40x10x4x2[7/3.5] / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020151 |
| GTIN/EAN | 5906301811572 |
| 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 |
Physical simulation of the assembly - report
Presented data are the result of a mathematical analysis. Values were calculated on models for the material Nd2Fe14B. Real-world performance might slightly differ. Please consider these data as a reference point when designing systems.
Table 1: Static force (force vs distance) - power drop
MPL 40x10x4x2[7/3.5] / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
2755 Gs
275.5 mT
|
9.31 kg / 9310.0 g
91.3 N
|
strong |
| 1 mm |
2413 Gs
241.3 mT
|
7.14 kg / 7143.1 g
70.1 N
|
strong |
| 2 mm |
2044 Gs
204.4 mT
|
5.13 kg / 5128.9 g
50.3 N
|
strong |
| 3 mm |
1703 Gs
170.3 mT
|
3.56 kg / 3559.5 g
34.9 N
|
strong |
| 5 mm |
1173 Gs
117.3 mT
|
1.69 kg / 1688.2 g
16.6 N
|
low risk |
| 10 mm |
522 Gs
52.2 mT
|
0.33 kg / 334.9 g
3.3 N
|
low risk |
| 15 mm |
277 Gs
27.7 mT
|
0.09 kg / 94.2 g
0.9 N
|
low risk |
| 20 mm |
163 Gs
16.3 mT
|
0.03 kg / 32.8 g
0.3 N
|
low risk |
| 30 mm |
69 Gs
6.9 mT
|
0.01 kg / 5.8 g
0.1 N
|
low risk |
| 50 mm |
19 Gs
1.9 mT
|
0.00 kg / 0.5 g
0.0 N
|
low risk |
Table 2: Slippage force (vertical surface)
MPL 40x10x4x2[7/3.5] / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.86 kg / 1862.0 g
18.3 N
|
| 1 mm | Stal (~0.2) |
1.43 kg / 1428.0 g
14.0 N
|
| 2 mm | Stal (~0.2) |
1.03 kg / 1026.0 g
10.1 N
|
| 3 mm | Stal (~0.2) |
0.71 kg / 712.0 g
7.0 N
|
| 5 mm | Stal (~0.2) |
0.34 kg / 338.0 g
3.3 N
|
| 10 mm | Stal (~0.2) |
0.07 kg / 66.0 g
0.6 N
|
| 15 mm | Stal (~0.2) |
0.02 kg / 18.0 g
0.2 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 6.0 g
0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MPL 40x10x4x2[7/3.5] / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.79 kg / 2793.0 g
27.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.86 kg / 1862.0 g
18.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.93 kg / 931.0 g
9.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
4.66 kg / 4655.0 g
45.7 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 40x10x4x2[7/3.5] / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.93 kg / 931.0 g
9.1 N
|
| 1 mm |
|
2.33 kg / 2327.5 g
22.8 N
|
| 2 mm |
|
4.66 kg / 4655.0 g
45.7 N
|
| 5 mm |
|
9.31 kg / 9310.0 g
91.3 N
|
| 10 mm |
|
9.31 kg / 9310.0 g
91.3 N
|
Table 5: Thermal stability (stability) - thermal limit
MPL 40x10x4x2[7/3.5] / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
9.31 kg / 9310.0 g
91.3 N
|
OK |
| 40 °C | -2.2% |
9.11 kg / 9105.2 g
89.3 N
|
OK |
| 60 °C | -4.4% |
8.90 kg / 8900.4 g
87.3 N
|
|
| 80 °C | -6.6% |
8.70 kg / 8695.5 g
85.3 N
|
|
| 100 °C | -28.8% |
6.63 kg / 6628.7 g
65.0 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 40x10x4x2[7/3.5] / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
18.71 kg / 18711 g
183.6 N
4 164 Gs
|
N/A |
| 1 mm |
16.57 kg / 16572 g
162.6 N
5 185 Gs
|
14.91 kg / 14915 g
146.3 N
~0 Gs
|
| 2 mm |
14.36 kg / 14356 g
140.8 N
4 826 Gs
|
12.92 kg / 12920 g
126.7 N
~0 Gs
|
| 3 mm |
12.24 kg / 12238 g
120.1 N
4 455 Gs
|
11.01 kg / 11015 g
108.1 N
~0 Gs
|
| 5 mm |
8.61 kg / 8609 g
84.5 N
3 737 Gs
|
7.75 kg / 7748 g
76.0 N
~0 Gs
|
| 10 mm |
3.39 kg / 3393 g
33.3 N
2 346 Gs
|
3.05 kg / 3054 g
30.0 N
~0 Gs
|
| 20 mm |
0.67 kg / 673 g
6.6 N
1 045 Gs
|
0.61 kg / 606 g
5.9 N
~0 Gs
|
| 50 mm |
0.03 kg / 26 g
0.3 N
207 Gs
|
0.02 kg / 24 g
0.2 N
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MPL 40x10x4x2[7/3.5] / 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: Dynamics (kinetic energy) - warning
MPL 40x10x4x2[7/3.5] / 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: Coating parameters (durability)
MPL 40x10x4x2[7/3.5] / 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 40x10x4x2[7/3.5] / 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 40x10x4x2[7/3.5] / 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)
*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.
2. Steel saturation
*Thin steel (e.g. computer case) drastically weakens the holding force.
3. Thermal stability
*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) = 0.26
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 proposals
Strengths as well as weaknesses of Nd2Fe14B magnets.
Benefits
- They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
- Neodymium magnets are characterized by extremely resistant to demagnetization caused by external magnetic fields,
- In other words, due to the metallic layer of gold, the element is aesthetically pleasing,
- Neodymium magnets ensure maximum magnetic induction on a their surface, which increases force concentration,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Possibility of accurate machining and adapting to individual requirements,
- Significant place in modern industrial fields – they are utilized in mass storage devices, electric motors, medical devices, and industrial machines.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Disadvantages
- To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 very resistant to heat
- They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- We suggest a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
- Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Additionally, tiny parts of these products can complicate diagnosis medical when they are in the body.
- Due to complex production process, their price is relatively high,
Lifting parameters
Maximum lifting capacity of the magnet – what affects it?
- on a plate made of mild steel, optimally conducting the magnetic field
- whose transverse dimension is min. 10 mm
- with an polished contact surface
- under conditions of gap-free contact (surface-to-surface)
- for force applied at a right angle (pull-off, not shear)
- at temperature approx. 20 degrees Celsius
Lifting capacity in practice – influencing factors
- Air gap (between the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- 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 maximum value.
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Steel grade – the best choice is high-permeability steel. Hardened steels may attract less.
- Surface quality – the more even the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
- Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.
Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Warnings
Safe distance
Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can destroy these devices and wipe information from cards.
Impact on smartphones
An intense magnetic field negatively affects the functioning of compasses in smartphones and navigation systems. Keep magnets close to a smartphone to avoid damaging the sensors.
Implant safety
Life threat: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.
Respect the power
Exercise caution. Rare earth magnets act from a long distance and snap with massive power, often faster than you can react.
Combustion hazard
Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.
Bodily injuries
Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!
Magnets are brittle
Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.
Avoid contact if allergic
Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, immediately stop handling magnets and wear gloves.
Maximum temperature
Keep cool. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).
Do not give to children
Strictly keep magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are life-threatening.
