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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Product card - 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 |
Engineering analysis of the assembly - data
The following information constitute the result of a physical simulation. Results are based on models for the material Nd2Fe14B. Actual performance might slightly differ. Please consider these calculations as a supplementary guide when designing systems.
Table 1: Static force (force vs gap) - interaction chart
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
|
low risk |
| 1 mm |
2886 Gs
288.6 mT
|
0.94 kg / 2.07 pounds
939.5 g / 9.2 N
|
low risk |
| 2 mm |
2048 Gs
204.8 mT
|
0.47 kg / 1.04 pounds
472.8 g / 4.6 N
|
low risk |
| 3 mm |
1412 Gs
141.2 mT
|
0.22 kg / 0.50 pounds
224.8 g / 2.2 N
|
low risk |
| 5 mm |
686 Gs
68.6 mT
|
0.05 kg / 0.12 pounds
53.0 g / 0.5 N
|
low risk |
| 10 mm |
165 Gs
16.5 mT
|
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
|
low risk |
| 15 mm |
60 Gs
6.0 mT
|
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
|
low risk |
| 20 mm |
28 Gs
2.8 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
low risk |
| 30 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Shear load (wall)
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) - vertical pull
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: Steel thickness (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: Thermal stability (material behavior) - thermal limit
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 (attraction) - field range
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: Hazards (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 |
| Phone / Smartphone | 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: Impact energy (cracking risk) - 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: Anti-corrosion coating 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: Hydrostatics and buoyancy
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. Shear force
*Caution: On a vertical wall, the magnet holds merely a fraction of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) severely weakens the holding force.
3. Power loss vs temp
*For standard magnets, 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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Advantages and disadvantages of rare earth magnets.
Advantages
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
- They retain their magnetic properties even under external field action,
- A magnet with a metallic gold surface has an effective appearance,
- They show high magnetic induction at the operating surface, making them more effective,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of precise shaping and adapting to complex applications,
- Huge importance in innovative solutions – they are utilized in computer drives, motor assemblies, precision medical tools, as well as industrial machines.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Weaknesses
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated forms.
- Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
- With mass production the cost of neodymium magnets can be a barrier,
Lifting parameters
Best holding force of the magnet in ideal parameters – what affects it?
- using a plate made of low-carbon steel, serving as a circuit closing element
- whose transverse dimension reaches at least 10 mm
- with a surface free of scratches
- under conditions of gap-free contact (surface-to-surface)
- under vertical force direction (90-degree angle)
- at temperature approx. 20 degrees Celsius
Determinants of practical lifting force of a magnet
- Clearance – the presence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Base massiveness – too thin sheet does not close the flux, causing part of the power to be escaped to the other side.
- Steel grade – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
- Plate texture – smooth surfaces ensure maximum contact, which improves force. Rough surfaces weaken the grip.
- Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.
Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate lowers the load capacity.
H&S for magnets
Flammability
Powder produced during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.
Bone fractures
Large magnets can crush fingers in a fraction of a second. Under no circumstances put your hand betwixt two attracting surfaces.
Material brittleness
Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Danger to pacemakers
Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.
Immense force
Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.
Nickel allergy
A percentage of the population suffer from a contact allergy to nickel, which is the standard coating for neodymium magnets. Extended handling might lead to an allergic reaction. We recommend wear safety gloves.
Danger to the youngest
Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from children and animals.
Keep away from electronics
GPS units and smartphones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.
Cards and drives
Powerful magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Keep a distance of at least 10 cm.
Permanent damage
Regular neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.
