MPL 20x8x6 / N38 - lamellar magnet
lamellar magnet
Catalog no 020134
GTIN/EAN: 5906301811404
length
20 mm [±0,1 mm]
Width
8 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
7.2 g
Magnetization Direction
↑ axial
Load capacity
6.27 kg / 61.50 N
Magnetic Induction
423.90 mT / 4239 Gs
Coating
[NiCuNi] Nickel
5.17 ZŁ with VAT / pcs + price for transport
4.20 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?
Give us a call
+48 22 499 98 98
if you prefer let us know via
form
the contact page.
Parameters as well as form of neodymium magnets can be tested with our
modular calculator.
Same-day processing for orders placed before 14:00.
Physical properties - MPL 20x8x6 / N38 - lamellar magnet
Specification / characteristics - MPL 20x8x6 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020134 |
| GTIN/EAN | 5906301811404 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 20 mm [±0,1 mm] |
| Width | 8 mm [±0,1 mm] |
| Height | 6 mm [±0,1 mm] |
| Weight | 7.2 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 6.27 kg / 61.50 N |
| Magnetic Induction ~ ? | 423.90 mT / 4239 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 modeling of the magnet - technical parameters
The following data constitute the direct effect of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Treat these data as a reference point during assembly planning.
Table 1: Static force (pull vs gap) - characteristics
MPL 20x8x6 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4236 Gs
423.6 mT
|
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
|
medium risk |
| 1 mm |
3505 Gs
350.5 mT
|
4.29 kg / 9.47 lbs
4293.5 g / 42.1 N
|
medium risk |
| 2 mm |
2814 Gs
281.4 mT
|
2.77 kg / 6.10 lbs
2766.9 g / 27.1 N
|
medium risk |
| 3 mm |
2235 Gs
223.5 mT
|
1.75 kg / 3.85 lbs
1745.9 g / 17.1 N
|
safe |
| 5 mm |
1425 Gs
142.5 mT
|
0.71 kg / 1.56 lbs
709.0 g / 7.0 N
|
safe |
| 10 mm |
540 Gs
54.0 mT
|
0.10 kg / 0.22 lbs
101.9 g / 1.0 N
|
safe |
| 15 mm |
248 Gs
24.8 mT
|
0.02 kg / 0.05 lbs
21.5 g / 0.2 N
|
safe |
| 20 mm |
131 Gs
13.1 mT
|
0.01 kg / 0.01 lbs
6.0 g / 0.1 N
|
safe |
| 30 mm |
48 Gs
4.8 mT
|
0.00 kg / 0.00 lbs
0.8 g / 0.0 N
|
safe |
| 50 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
safe |
Table 2: Sliding capacity (wall)
MPL 20x8x6 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.25 kg / 2.76 lbs
1254.0 g / 12.3 N
|
| 1 mm | Stal (~0.2) |
0.86 kg / 1.89 lbs
858.0 g / 8.4 N
|
| 2 mm | Stal (~0.2) |
0.55 kg / 1.22 lbs
554.0 g / 5.4 N
|
| 3 mm | Stal (~0.2) |
0.35 kg / 0.77 lbs
350.0 g / 3.4 N
|
| 5 mm | Stal (~0.2) |
0.14 kg / 0.31 lbs
142.0 g / 1.4 N
|
| 10 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
20.0 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 20x8x6 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.88 kg / 4.15 lbs
1881.0 g / 18.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.25 kg / 2.76 lbs
1254.0 g / 12.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.63 kg / 1.38 lbs
627.0 g / 6.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.14 kg / 6.91 lbs
3135.0 g / 30.8 N
|
Table 4: Material efficiency (saturation) - power losses
MPL 20x8x6 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.63 kg / 1.38 lbs
627.0 g / 6.2 N
|
| 1 mm |
|
1.57 kg / 3.46 lbs
1567.5 g / 15.4 N
|
| 2 mm |
|
3.14 kg / 6.91 lbs
3135.0 g / 30.8 N
|
| 3 mm |
|
4.70 kg / 10.37 lbs
4702.5 g / 46.1 N
|
| 5 mm |
|
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
|
| 10 mm |
|
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
|
| 11 mm |
|
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
|
| 12 mm |
|
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
|
Table 5: Thermal stability (stability) - thermal limit
MPL 20x8x6 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
|
OK |
| 40 °C | -2.2% |
6.13 kg / 13.52 lbs
6132.1 g / 60.2 N
|
OK |
| 60 °C | -4.4% |
5.99 kg / 13.21 lbs
5994.1 g / 58.8 N
|
|
| 80 °C | -6.6% |
5.86 kg / 12.91 lbs
5856.2 g / 57.4 N
|
|
| 100 °C | -28.8% |
4.46 kg / 9.84 lbs
4464.2 g / 43.8 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 20x8x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
17.70 kg / 39.02 lbs
5 386 Gs
|
2.66 kg / 5.85 lbs
2655 g / 26.0 N
|
N/A |
| 1 mm |
14.82 kg / 32.66 lbs
7 751 Gs
|
2.22 kg / 4.90 lbs
2222 g / 21.8 N
|
13.33 kg / 29.40 lbs
~0 Gs
|
| 2 mm |
12.12 kg / 26.72 lbs
7 011 Gs
|
1.82 kg / 4.01 lbs
1818 g / 17.8 N
|
10.91 kg / 24.05 lbs
~0 Gs
|
| 3 mm |
9.78 kg / 21.55 lbs
6 296 Gs
|
1.47 kg / 3.23 lbs
1466 g / 14.4 N
|
8.80 kg / 19.40 lbs
~0 Gs
|
| 5 mm |
6.21 kg / 13.69 lbs
5 018 Gs
|
0.93 kg / 2.05 lbs
932 g / 9.1 N
|
5.59 kg / 12.32 lbs
~0 Gs
|
| 10 mm |
2.00 kg / 4.41 lbs
2 849 Gs
|
0.30 kg / 0.66 lbs
300 g / 2.9 N
|
1.80 kg / 3.97 lbs
~0 Gs
|
| 20 mm |
0.29 kg / 0.63 lbs
1 080 Gs
|
0.04 kg / 0.10 lbs
43 g / 0.4 N
|
0.26 kg / 0.57 lbs
~0 Gs
|
| 50 mm |
0.01 kg / 0.01 lbs
153 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 / 0.01 lbs
97 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
65 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
45 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
33 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
25 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (electronics) - warnings
MPL 20x8x6 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 7.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.5 cm |
| Remote | 50 Gs (5.0 mT) | 3.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (kinetic energy) - warning
MPL 20x8x6 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
30.06 km/h
(8.35 m/s)
|
0.25 J | |
| 30 mm |
51.55 km/h
(14.32 m/s)
|
0.74 J | |
| 50 mm |
66.55 km/h
(18.49 m/s)
|
1.23 J | |
| 100 mm |
94.11 km/h
(26.14 m/s)
|
2.46 J |
Table 9: Anti-corrosion coating durability
MPL 20x8x6 / 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 (Pc)
MPL 20x8x6 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 6 558 Mx | 65.6 µWb |
| Pc Coefficient | 0.52 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 20x8x6 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 6.27 kg | Standard |
| Water (riverbed) |
7.18 kg
(+0.91 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical wall, the magnet holds just a fraction of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) significantly limits the holding force.
3. Temperature resistance
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.52
The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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
Strengths as well as weaknesses of Nd2Fe14B magnets.
Advantages
- They do not lose power, even after around 10 years – the reduction in strength is only ~1% (according to tests),
- They are resistant to demagnetization induced by external magnetic fields,
- In other words, due to the glossy finish of silver, the element looks attractive,
- The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of custom machining and optimizing to concrete requirements,
- Fundamental importance in innovative solutions – they are used in computer drives, electric motors, precision medical tools, and modern systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in miniature devices
Weaknesses
- To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 very resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- We recommend casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
- Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Maximum holding power of the magnet – what affects it?
- with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
- with a thickness no less than 10 mm
- characterized by even structure
- without any air gap between the magnet and steel
- under perpendicular force direction (90-degree angle)
- at temperature approx. 20 degrees Celsius
Key elements affecting lifting force
- Distance – the presence of any layer (rust, tape, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
- Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Plate thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be wasted into the air.
- Plate material – mild steel gives the best results. Alloy admixtures reduce magnetic properties and lifting capacity.
- Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.
Warnings
GPS and phone interference
Navigation devices and mobile phones are extremely sensitive to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.
Allergic reactions
Studies show that the nickel plating (the usual finish) is a strong allergen. If your skin reacts to metals, avoid touching magnets with bare hands or choose coated magnets.
Pinching danger
Big blocks can smash fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.
Fire warning
Dust generated during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
No play value
Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from kids and pets.
Shattering risk
Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.
Protect data
Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Keep a distance of min. 10 cm.
Do not underestimate power
Handle magnets with awareness. Their huge power can shock even experienced users. Be vigilant and do not underestimate their force.
Power loss in heat
Standard neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.
Pacemakers
Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.
