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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Technical - 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 |
Technical analysis of the product - report
These information represent the result of a engineering analysis. Values are based on models for the class Nd2Fe14B. Operational conditions may deviate from the simulation results. Treat these calculations as a preliminary roadmap for designers.
Table 1: Static force (force vs distance) - characteristics
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
|
safe |
| 5 mm |
832 Gs
83.2 mT
|
0.53 kg / 1.16 LBS
526.9 g / 5.2 N
|
safe |
| 10 mm |
318 Gs
31.8 mT
|
0.08 kg / 0.17 LBS
77.1 g / 0.8 N
|
safe |
| 15 mm |
158 Gs
15.8 mT
|
0.02 kg / 0.04 LBS
18.9 g / 0.2 N
|
safe |
| 20 mm |
89 Gs
8.9 mT
|
0.01 kg / 0.01 LBS
6.0 g / 0.1 N
|
safe |
| 30 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 LBS
1.0 g / 0.0 N
|
safe |
| 50 mm |
10 Gs
1.0 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
safe |
Table 2: Vertical capacity (wall)
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: Vertical assembly (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: Thermal stability (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 (repulsion) - field range
MPL 35x7x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (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: Hazards (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 |
| Mobile device | 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 (cracking risk) - collision effects
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: Corrosion resistance
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 (Pc)
MPL 35x7x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 851 Mx | 58.5 µWb |
| Pc Coefficient | 0.25 | Low (Flat) |
Table 11: Physics of underwater searching
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. Vertical hold
*Caution: On a vertical wall, the magnet retains merely ~20% of its max power.
2. Plate thickness effect
*Thin steel (e.g. computer case) significantly reduces 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 products
Strengths as well as weaknesses of Nd2Fe14B magnets.
Advantages
- They retain attractive force for almost ten years – the loss is just ~1% (according to analyses),
- Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
- Thanks to the shimmering finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an elegant appearance,
- Neodymium magnets achieve maximum magnetic induction on a contact point, which increases force concentration,
- 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...
- Possibility of individual shaping and modifying to specific needs,
- Huge importance in innovative solutions – they find application in magnetic memories, drive modules, diagnostic systems, and technologically advanced constructions.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Cons
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its 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 those in rubber or plastics, which secure oxidation and corrosion.
- Due to limitations in realizing threads and complicated shapes in magnets, we propose using a housing - magnetic holder.
- Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Maximum magnetic pulling force – what contributes to it?
- with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
- with a thickness no less than 10 mm
- with a surface cleaned and smooth
- under conditions of no distance (metal-to-metal)
- during pulling in a direction perpendicular to the mounting surface
- in stable room temperature
Key elements affecting lifting force
- Distance (between the magnet and the metal), as even a very small distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
- Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
- Chemical composition of the base – low-carbon steel attracts best. Alloy steels lower magnetic permeability and lifting capacity.
- Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Thermal factor – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.
Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the holding force.
H&S for magnets
Do not underestimate power
Before use, read the rules. Sudden snapping can destroy the magnet or injure your hand. Be predictive.
Protect data
Avoid bringing magnets close to a purse, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.
Pacemakers
Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.
Phone sensors
Remember: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a separation from your phone, device, and GPS.
Dust explosion hazard
Fire warning: Rare earth powder is explosive. Avoid machining magnets in home conditions as this risks ignition.
Demagnetization risk
Watch the temperature. Exposing the magnet to high heat will ruin its properties and strength.
Magnets are brittle
Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.
Keep away from children
Neodymium magnets are not toys. Swallowing several magnets can lead to them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.
Sensitization to coating
Medical facts indicate that nickel (standard magnet coating) is a strong allergen. For allergy sufferers, avoid touching magnets with bare hands or select encased magnets.
Serious injuries
Protect your hands. Two large magnets will snap together instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!
