MPL 7x7x3 / N38 - lamellar magnet
lamellar magnet
Catalog no 020176
GTIN/EAN: 5906301811824
length
7 mm [±0,1 mm]
Width
7 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
1.1 g
Magnetization Direction
↑ axial
Load capacity
1.60 kg / 15.70 N
Magnetic Induction
376.99 mT / 3770 Gs
Coating
[NiCuNi] Nickel
0.541 ZŁ with VAT / pcs + price for transport
0.440 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical specification - MPL 7x7x3 / N38 - lamellar magnet
Specification / characteristics - MPL 7x7x3 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020176 |
| GTIN/EAN | 5906301811824 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 7 mm [±0,1 mm] |
| Width | 7 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 1.1 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.60 kg / 15.70 N |
| Magnetic Induction ~ ? | 376.99 mT / 3770 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 modeling of the product - technical parameters
Presented data constitute the direct effect of a physical analysis. Results are based on algorithms for the class Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Treat these data as a reference point for designers.
Table 1: Static force (force vs distance) - power drop
MPL 7x7x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3767 Gs
376.7 mT
|
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
|
safe |
| 1 mm |
2886 Gs
288.6 mT
|
0.94 kg / 2.07 pounds
939.5 g / 9.2 N
|
safe |
| 2 mm |
2048 Gs
204.8 mT
|
0.47 kg / 1.04 pounds
472.8 g / 4.6 N
|
safe |
| 3 mm |
1412 Gs
141.2 mT
|
0.22 kg / 0.50 pounds
224.8 g / 2.2 N
|
safe |
| 5 mm |
686 Gs
68.6 mT
|
0.05 kg / 0.12 pounds
53.0 g / 0.5 N
|
safe |
| 10 mm |
165 Gs
16.5 mT
|
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
|
safe |
| 15 mm |
60 Gs
6.0 mT
|
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
|
safe |
| 20 mm |
28 Gs
2.8 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
safe |
| 30 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Slippage hold (vertical surface)
MPL 7x7x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
|
| 1 mm | Stal (~0.2) |
0.19 kg / 0.41 pounds
188.0 g / 1.8 N
|
| 2 mm | Stal (~0.2) |
0.09 kg / 0.21 pounds
94.0 g / 0.9 N
|
| 3 mm | Stal (~0.2) |
0.04 kg / 0.10 pounds
44.0 g / 0.4 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
10.0 g / 0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 7x7x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.48 kg / 1.06 pounds
480.0 g / 4.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.80 kg / 1.76 pounds
800.0 g / 7.8 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 7x7x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
|
| 1 mm |
|
0.40 kg / 0.88 pounds
400.0 g / 3.9 N
|
| 2 mm |
|
0.80 kg / 1.76 pounds
800.0 g / 7.8 N
|
| 3 mm |
|
1.20 kg / 2.65 pounds
1200.0 g / 11.8 N
|
| 5 mm |
|
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
|
| 10 mm |
|
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
|
| 11 mm |
|
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
|
| 12 mm |
|
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
|
Table 5: Working in heat (material behavior) - power drop
MPL 7x7x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
|
OK |
| 40 °C | -2.2% |
1.56 kg / 3.45 pounds
1564.8 g / 15.4 N
|
OK |
| 60 °C | -4.4% |
1.53 kg / 3.37 pounds
1529.6 g / 15.0 N
|
|
| 80 °C | -6.6% |
1.49 kg / 3.29 pounds
1494.4 g / 14.7 N
|
|
| 100 °C | -28.8% |
1.14 kg / 2.51 pounds
1139.2 g / 11.2 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 7x7x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
4.29 kg / 9.45 pounds
5 173 Gs
|
0.64 kg / 1.42 pounds
643 g / 6.3 N
|
N/A |
| 1 mm |
3.38 kg / 7.44 pounds
6 685 Gs
|
0.51 kg / 1.12 pounds
506 g / 5.0 N
|
3.04 kg / 6.70 pounds
~0 Gs
|
| 2 mm |
2.52 kg / 5.55 pounds
5 773 Gs
|
0.38 kg / 0.83 pounds
378 g / 3.7 N
|
2.27 kg / 4.99 pounds
~0 Gs
|
| 3 mm |
1.81 kg / 3.99 pounds
4 893 Gs
|
0.27 kg / 0.60 pounds
271 g / 2.7 N
|
1.63 kg / 3.59 pounds
~0 Gs
|
| 5 mm |
0.88 kg / 1.93 pounds
3 405 Gs
|
0.13 kg / 0.29 pounds
131 g / 1.3 N
|
0.79 kg / 1.74 pounds
~0 Gs
|
| 10 mm |
0.14 kg / 0.31 pounds
1 372 Gs
|
0.02 kg / 0.05 pounds
21 g / 0.2 N
|
0.13 kg / 0.28 pounds
~0 Gs
|
| 20 mm |
0.01 kg / 0.02 pounds
329 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
30 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
18 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
12 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
8 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
6 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
4 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MPL 7x7x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 4.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Collisions (kinetic energy) - collision effects
MPL 7x7x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
38.51 km/h
(10.70 m/s)
|
0.06 J | |
| 30 mm |
66.62 km/h
(18.51 m/s)
|
0.19 J | |
| 50 mm |
86.01 km/h
(23.89 m/s)
|
0.31 J | |
| 100 mm |
121.63 km/h
(33.79 m/s)
|
0.63 J |
Table 9: Coating parameters (durability)
MPL 7x7x3 / 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 7x7x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 909 Mx | 19.1 µWb |
| Pc Coefficient | 0.48 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MPL 7x7x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.60 kg | Standard |
| Water (riverbed) |
1.83 kg
(+0.23 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Heat tolerance
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48
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 |
Other products
Pros as well as cons of neodymium magnets.
Advantages
- They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
- Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
- By using a reflective layer of gold, the element acquires an professional look,
- Magnetic induction on the working layer of the magnet remains very high,
- Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- Due to the possibility of precise molding and adaptation to custom requirements, magnetic components can be produced in a broad palette of forms and dimensions, which expands the range of possible applications,
- Huge importance in future technologies – they are utilized in magnetic memories, drive modules, advanced medical instruments, as well as complex engineering applications.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
- Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We suggest a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex shapes.
- Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
- Due to complex production process, their price exceeds standard values,
Holding force characteristics
Maximum magnetic pulling force – what affects it?
- on a base made of structural steel, effectively closing the magnetic flux
- with a cross-section no less than 10 mm
- with a surface cleaned and smooth
- under conditions of no distance (surface-to-surface)
- for force acting at a right angle (pull-off, not shear)
- in stable room temperature
Impact of factors on magnetic holding capacity in practice
- Distance – the presence of any layer (rust, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
- Angle of force application – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
- Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Thermal environment – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity was measured by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet’s surface and the plate reduces the load capacity.
Warnings
Finger safety
Pinching hazard: The pulling power is so great that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.
Mechanical processing
Dust produced during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
GPS Danger
GPS units and smartphones are highly sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the sensors in your phone.
Product not for children
Strictly store magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are tragic.
Demagnetization risk
Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. This process is irreversible.
Warning for allergy sufferers
Some people have a sensitization to Ni, which is the common plating for NdFeB magnets. Extended handling can result in dermatitis. It is best to use protective gloves.
Risk of cracking
Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.
Cards and drives
Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.
Handling guide
Handle magnets consciously. Their huge power can surprise even experienced users. Plan your moves and respect their power.
Danger to pacemakers
People with a ICD have to keep an safe separation from magnets. The magnetism can stop the operation of the life-saving device.
