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:
Need more?
Pick up the phone and ask
+48 22 499 98 98
if you prefer drop us a message using
request form
the contact form page.
Lifting power as well as shape of neodymium magnets can be estimated with our
magnetic calculator.
Same-day processing for orders placed before 14:00.
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 simulation of the magnet - technical parameters
The following information represent the result of a physical analysis. Results are based on models for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these calculations as a supplementary guide when designing systems.
Table 1: Static force (pull vs distance) - 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 lbs
1600.0 g / 15.7 N
|
safe |
| 1 mm |
2886 Gs
288.6 mT
|
0.94 kg / 2.07 lbs
939.5 g / 9.2 N
|
safe |
| 2 mm |
2048 Gs
204.8 mT
|
0.47 kg / 1.04 lbs
472.8 g / 4.6 N
|
safe |
| 3 mm |
1412 Gs
141.2 mT
|
0.22 kg / 0.50 lbs
224.8 g / 2.2 N
|
safe |
| 5 mm |
686 Gs
68.6 mT
|
0.05 kg / 0.12 lbs
53.0 g / 0.5 N
|
safe |
| 10 mm |
165 Gs
16.5 mT
|
0.00 kg / 0.01 lbs
3.1 g / 0.0 N
|
safe |
| 15 mm |
60 Gs
6.0 mT
|
0.00 kg / 0.00 lbs
0.4 g / 0.0 N
|
safe |
| 20 mm |
28 Gs
2.8 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
safe |
| 30 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Shear force (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 lbs
320.0 g / 3.1 N
|
| 1 mm | Stal (~0.2) |
0.19 kg / 0.41 lbs
188.0 g / 1.8 N
|
| 2 mm | Stal (~0.2) |
0.09 kg / 0.21 lbs
94.0 g / 0.9 N
|
| 3 mm | Stal (~0.2) |
0.04 kg / 0.10 lbs
44.0 g / 0.4 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
10.0 g / 0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 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 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 lbs
480.0 g / 4.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.32 kg / 0.71 lbs
320.0 g / 3.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.16 kg / 0.35 lbs
160.0 g / 1.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.80 kg / 1.76 lbs
800.0 g / 7.8 N
|
Table 4: Steel thickness (substrate influence) - power losses
MPL 7x7x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.16 kg / 0.35 lbs
160.0 g / 1.6 N
|
| 1 mm |
|
0.40 kg / 0.88 lbs
400.0 g / 3.9 N
|
| 2 mm |
|
0.80 kg / 1.76 lbs
800.0 g / 7.8 N
|
| 3 mm |
|
1.20 kg / 2.65 lbs
1200.0 g / 11.8 N
|
| 5 mm |
|
1.60 kg / 3.53 lbs
1600.0 g / 15.7 N
|
| 10 mm |
|
1.60 kg / 3.53 lbs
1600.0 g / 15.7 N
|
| 11 mm |
|
1.60 kg / 3.53 lbs
1600.0 g / 15.7 N
|
| 12 mm |
|
1.60 kg / 3.53 lbs
1600.0 g / 15.7 N
|
Table 5: Thermal stability (stability) - 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 lbs
1600.0 g / 15.7 N
|
OK |
| 40 °C | -2.2% |
1.56 kg / 3.45 lbs
1564.8 g / 15.4 N
|
OK |
| 60 °C | -4.4% |
1.53 kg / 3.37 lbs
1529.6 g / 15.0 N
|
|
| 80 °C | -6.6% |
1.49 kg / 3.29 lbs
1494.4 g / 14.7 N
|
|
| 100 °C | -28.8% |
1.14 kg / 2.51 lbs
1139.2 g / 11.2 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 7x7x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
4.29 kg / 9.45 lbs
5 173 Gs
|
0.64 kg / 1.42 lbs
643 g / 6.3 N
|
N/A |
| 1 mm |
3.38 kg / 7.44 lbs
6 685 Gs
|
0.51 kg / 1.12 lbs
506 g / 5.0 N
|
3.04 kg / 6.70 lbs
~0 Gs
|
| 2 mm |
2.52 kg / 5.55 lbs
5 773 Gs
|
0.38 kg / 0.83 lbs
378 g / 3.7 N
|
2.27 kg / 4.99 lbs
~0 Gs
|
| 3 mm |
1.81 kg / 3.99 lbs
4 893 Gs
|
0.27 kg / 0.60 lbs
271 g / 2.7 N
|
1.63 kg / 3.59 lbs
~0 Gs
|
| 5 mm |
0.88 kg / 1.93 lbs
3 405 Gs
|
0.13 kg / 0.29 lbs
131 g / 1.3 N
|
0.79 kg / 1.74 lbs
~0 Gs
|
| 10 mm |
0.14 kg / 0.31 lbs
1 372 Gs
|
0.02 kg / 0.05 lbs
21 g / 0.2 N
|
0.13 kg / 0.28 lbs
~0 Gs
|
| 20 mm |
0.01 kg / 0.02 lbs
329 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
30 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
18 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
12 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
8 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
6 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
4 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 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: Collisions (kinetic energy) - warning
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: Construction 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: Physics of underwater searching
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. Vertical hold
*Note: On a vertical surface, the magnet holds only approx. 20-30% of its perpendicular strength.
2. Efficiency vs thickness
*Thin metal sheet (e.g. 0.5mm PC 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) = 0.48
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 offers
Strengths and weaknesses of neodymium magnets.
Benefits
- They do not lose magnetism, even after around 10 years – the drop in power is only ~1% (according to tests),
- They have excellent resistance to magnetism drop due to external fields,
- A magnet with a shiny silver surface has better aesthetics,
- They are known for high magnetic induction at the operating surface, making them more effective,
- 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...
- Thanks to freedom in forming and the capacity to modify to unusual requirements,
- Fundamental importance in modern industrial fields – they are used in data components, electric motors, medical equipment, and other advanced devices.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Cons
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
- Due to limitations in producing threads and complicated forms in magnets, we propose using casing - magnetic holder.
- Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these products can complicate diagnosis medical in case of swallowing.
- With large orders the cost of neodymium magnets is a challenge,
Holding force characteristics
Maximum lifting force for a neodymium magnet – what affects it?
- with the use of a yoke made of low-carbon steel, ensuring full magnetic saturation
- whose transverse dimension is min. 10 mm
- with an polished contact surface
- with direct contact (without impurities)
- during detachment in a direction vertical to the plane
- at ambient temperature room level
Determinants of practical lifting force of a magnet
- Gap (between the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
- Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of nominal force).
- Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
- Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
- Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.
Warnings
Dust explosion hazard
Powder created during grinding of magnets is combustible. Avoid drilling into magnets unless you are an expert.
Respect the power
Use magnets with awareness. Their immense force can surprise even professionals. Stay alert and respect their power.
Skin irritation risks
Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction occurs, immediately stop working with magnets and wear gloves.
Serious injuries
Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!
Medical implants
Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.
Protect data
Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.
Material brittleness
Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Power loss in heat
Avoid heat. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).
Magnetic interference
GPS units and mobile phones are highly susceptible to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.
Adults only
Product intended for adults. Tiny parts pose a choking risk, causing intestinal necrosis. Keep out of reach of children and animals.
