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 |
Physical modeling of the magnet - report
The following information are the direct effect of a physical calculation. Results were calculated on models for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Please consider these calculations as a reference point when designing systems.
Table 1: Static force (force 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
|
warning |
| 1 mm |
2328 Gs
232.8 mT
|
4.12 kg / 9.09 lbs
4121.1 g / 40.4 N
|
warning |
| 2 mm |
1801 Gs
180.1 mT
|
2.47 kg / 5.44 lbs
2467.6 g / 24.2 N
|
warning |
| 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: Slippage hold (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) - behavior on slippery surfaces
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 (substrate influence) - sheet metal selection
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: Working in heat (stability) - resistance threshold
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 (attraction) - field range
MPL 35x7x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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) - precautionary measures
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 |
| Timepiece | 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: Anti-corrosion coating durability
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. Sliding resistance
*Warning: On a vertical surface, the magnet holds only ~20% of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely reduces the holding force.
3. Temperature resistance
*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% |
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.
Advantages
- They retain magnetic properties for nearly 10 years – the drop is just ~1% (in theory),
- They retain their magnetic properties even under close interference source,
- Thanks to the elegant finish, the coating of nickel, gold-plated, or silver gives an visually attractive appearance,
- They feature high magnetic induction at the operating surface, which improves attraction properties,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
- In view of the potential of flexible forming and adaptation to individualized needs, neodymium magnets can be created in a variety of forms and dimensions, which expands the range of possible applications,
- Huge importance in electronics industry – they are commonly used in HDD drives, drive modules, precision medical tools, and multitasking production systems.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
- Limited possibility of creating threads in the magnet and complex forms - preferred is casing - mounting mechanism.
- Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical after entering the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Maximum magnetic pulling force – what affects it?
- on a block made of mild steel, perfectly concentrating the magnetic field
- possessing a massiveness of minimum 10 mm to avoid saturation
- with a plane free of scratches
- without any insulating layer between the magnet and steel
- during detachment in a direction perpendicular to the mounting surface
- at room temperature
Practical aspects of lifting capacity – factors
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
- Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Material composition – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
- Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
- Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the holding force.
Safety rules for work with neodymium magnets
Power loss in heat
Do not overheat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).
Electronic hazard
Device Safety: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).
Precision electronics
Remember: neodymium magnets produce a field that disrupts precision electronics. Keep a separation from your mobile, device, and GPS.
Safe operation
Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.
Dust is flammable
Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Nickel coating and allergies
Allergy Notice: The nickel-copper-nickel coating contains nickel. If skin irritation happens, cease working with magnets and use protective gear.
ICD Warning
For implant holders: Powerful magnets affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.
Crushing risk
Mind your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!
Swallowing risk
These products are not suitable for play. Eating a few magnets may result in them attracting across intestines, which constitutes a critical condition and requires urgent medical intervention.
Shattering risk
Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets leads to them breaking into shards.
