MPL 35x7x3 / N38 - lamellar magnet
lamellar magnet
Catalog no 020145
GTIN/EAN: 5906301811510
length
35 mm [±0,1 mm]
Width
7 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
5.51 g
Magnetization Direction
↑ axial
Load capacity
6.21 kg / 60.89 N
Magnetic Induction
285.96 mT / 2860 Gs
Coating
[NiCuNi] Nickel
2.99 ZŁ with VAT / pcs + price for transport
2.43 ZŁ net + 23% VAT / pcs
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Physical properties - MPL 35x7x3 / N38 - lamellar magnet
Specification / characteristics - MPL 35x7x3 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020145 |
| GTIN/EAN | 5906301811510 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 35 mm [±0,1 mm] |
| Width | 7 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 5.51 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 6.21 kg / 60.89 N |
| Magnetic Induction ~ ? | 285.96 mT / 2860 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 analysis of the assembly - technical parameters
These data constitute the result of a engineering simulation. Values were calculated on algorithms for the material Nd2Fe14B. Real-world conditions may deviate from the simulation results. Treat these calculations as a reference point for designers.
Table 1: Static pull force (pull vs gap) - power drop
MPL 35x7x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2858 Gs
285.8 mT
|
6.21 kg / 13.69 lbs
6210.0 g / 60.9 N
|
medium risk |
| 1 mm |
2328 Gs
232.8 mT
|
4.12 kg / 9.09 lbs
4121.1 g / 40.4 N
|
medium risk |
| 2 mm |
1801 Gs
180.1 mT
|
2.47 kg / 5.44 lbs
2467.6 g / 24.2 N
|
medium risk |
| 3 mm |
1376 Gs
137.6 mT
|
1.44 kg / 3.18 lbs
1440.7 g / 14.1 N
|
low risk |
| 5 mm |
832 Gs
83.2 mT
|
0.53 kg / 1.16 lbs
526.9 g / 5.2 N
|
low risk |
| 10 mm |
318 Gs
31.8 mT
|
0.08 kg / 0.17 lbs
77.1 g / 0.8 N
|
low risk |
| 15 mm |
158 Gs
15.8 mT
|
0.02 kg / 0.04 lbs
18.9 g / 0.2 N
|
low risk |
| 20 mm |
89 Gs
8.9 mT
|
0.01 kg / 0.01 lbs
6.0 g / 0.1 N
|
low risk |
| 30 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 lbs
1.0 g / 0.0 N
|
low risk |
| 50 mm |
10 Gs
1.0 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
low risk |
Table 2: Sliding capacity (vertical surface)
MPL 35x7x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.24 kg / 2.74 lbs
1242.0 g / 12.2 N
|
| 1 mm | Stal (~0.2) |
0.82 kg / 1.82 lbs
824.0 g / 8.1 N
|
| 2 mm | Stal (~0.2) |
0.49 kg / 1.09 lbs
494.0 g / 4.8 N
|
| 3 mm | Stal (~0.2) |
0.29 kg / 0.63 lbs
288.0 g / 2.8 N
|
| 5 mm | Stal (~0.2) |
0.11 kg / 0.23 lbs
106.0 g / 1.0 N
|
| 10 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
16.0 g / 0.2 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MPL 35x7x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.86 kg / 4.11 lbs
1863.0 g / 18.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.24 kg / 2.74 lbs
1242.0 g / 12.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.62 kg / 1.37 lbs
621.0 g / 6.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.11 kg / 6.85 lbs
3105.0 g / 30.5 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 35x7x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.62 kg / 1.37 lbs
621.0 g / 6.1 N
|
| 1 mm |
|
1.55 kg / 3.42 lbs
1552.5 g / 15.2 N
|
| 2 mm |
|
3.11 kg / 6.85 lbs
3105.0 g / 30.5 N
|
| 3 mm |
|
4.66 kg / 10.27 lbs
4657.5 g / 45.7 N
|
| 5 mm |
|
6.21 kg / 13.69 lbs
6210.0 g / 60.9 N
|
| 10 mm |
|
6.21 kg / 13.69 lbs
6210.0 g / 60.9 N
|
| 11 mm |
|
6.21 kg / 13.69 lbs
6210.0 g / 60.9 N
|
| 12 mm |
|
6.21 kg / 13.69 lbs
6210.0 g / 60.9 N
|
Table 5: Thermal stability (material behavior) - power drop
MPL 35x7x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
6.21 kg / 13.69 lbs
6210.0 g / 60.9 N
|
OK |
| 40 °C | -2.2% |
6.07 kg / 13.39 lbs
6073.4 g / 59.6 N
|
OK |
| 60 °C | -4.4% |
5.94 kg / 13.09 lbs
5936.8 g / 58.2 N
|
|
| 80 °C | -6.6% |
5.80 kg / 12.79 lbs
5800.1 g / 56.9 N
|
|
| 100 °C | -28.8% |
4.42 kg / 9.75 lbs
4421.5 g / 43.4 N
|
Table 6: Two magnets (repulsion) - field range
MPL 35x7x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
12.34 kg / 27.19 lbs
4 231 Gs
|
1.85 kg / 4.08 lbs
1850 g / 18.2 N
|
N/A |
| 1 mm |
10.25 kg / 22.59 lbs
5 209 Gs
|
1.54 kg / 3.39 lbs
1537 g / 15.1 N
|
9.22 kg / 20.33 lbs
~0 Gs
|
| 2 mm |
8.19 kg / 18.05 lbs
4 656 Gs
|
1.23 kg / 2.71 lbs
1228 g / 12.0 N
|
7.37 kg / 16.24 lbs
~0 Gs
|
| 3 mm |
6.38 kg / 14.07 lbs
4 110 Gs
|
0.96 kg / 2.11 lbs
957 g / 9.4 N
|
5.74 kg / 12.66 lbs
~0 Gs
|
| 5 mm |
3.74 kg / 8.25 lbs
3 149 Gs
|
0.56 kg / 1.24 lbs
562 g / 5.5 N
|
3.37 kg / 7.43 lbs
~0 Gs
|
| 10 mm |
1.05 kg / 2.31 lbs
1 665 Gs
|
0.16 kg / 0.35 lbs
157 g / 1.5 N
|
0.94 kg / 2.08 lbs
~0 Gs
|
| 20 mm |
0.15 kg / 0.34 lbs
637 Gs
|
0.02 kg / 0.05 lbs
23 g / 0.2 N
|
0.14 kg / 0.30 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 lbs
109 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
71 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
48 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 lbs
34 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 lbs
25 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 lbs
19 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MPL 35x7x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.0 cm |
| Car key | 50 Gs (5.0 mT) | 3.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (kinetic energy) - warning
MPL 35x7x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
34.12 km/h
(9.48 m/s)
|
0.25 J | |
| 30 mm |
58.65 km/h
(16.29 m/s)
|
0.73 J | |
| 50 mm |
75.71 km/h
(21.03 m/s)
|
1.22 J | |
| 100 mm |
107.07 km/h
(29.74 m/s)
|
2.44 J |
Table 9: Surface protection spec
MPL 35x7x3 / 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 35x7x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 851 Mx | 58.5 µWb |
| Pc Coefficient | 0.25 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 35x7x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 6.21 kg | Standard |
| Water (riverbed) |
7.11 kg
(+0.90 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical wall, the magnet retains only a fraction of its max power.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) drastically weakens the holding force.
3. Power loss vs temp
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.25
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Pros as well as cons of Nd2Fe14B magnets.
Advantages
- They retain full power for almost 10 years – the loss is just ~1% (based on simulations),
- Magnets effectively defend themselves against loss of magnetization caused by external fields,
- Thanks to the shiny finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an aesthetic appearance,
- They are known for high magnetic induction at the operating surface, which improves attraction properties,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Considering the potential of accurate forming and customization to custom needs, neodymium magnets can be manufactured in a broad palette of forms and dimensions, which expands the range of possible applications,
- Versatile presence in modern technologies – they find application in HDD drives, electric drive systems, advanced medical instruments, also industrial machines.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Cons
- They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
- Neodymium magnets decrease their force 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
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
- Limited possibility of making nuts in the magnet and complex forms - recommended is cover - magnetic holder.
- Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, small elements of these products can be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what affects it?
- with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
- possessing a massiveness of min. 10 mm to avoid saturation
- with a surface cleaned and smooth
- with direct contact (no impurities)
- during pulling in a direction perpendicular to the mounting surface
- at standard ambient temperature
Determinants of practical lifting force of a magnet
- Distance – existence of foreign body (rust, dirt, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
- Chemical composition of the base – mild steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
- Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Thermal factor – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate lowers the lifting capacity.
H&S for magnets
No play value
NdFeB magnets are not intended for children. Swallowing several magnets may result in them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.
Implant safety
Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.
Allergic reactions
A percentage of the population suffer from a sensitization to nickel, which is the typical protective layer for neodymium magnets. Extended handling may cause dermatitis. It is best to wear safety gloves.
Respect the power
Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.
Crushing force
Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Be careful!
GPS Danger
Note: rare earth magnets generate a field that confuses sensitive sensors. Keep a separation from your mobile, tablet, and GPS.
Do not drill into magnets
Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.
Beware of splinters
Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.
Protect data
Equipment safety: Strong magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).
Demagnetization risk
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.
