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?
Contact us by phone
+48 22 499 98 98
otherwise drop us a message by means of
inquiry form
the contact section.
Specifications along with appearance of a magnet can be reviewed using our
magnetic mass calculator.
Same-day shipping for orders placed before 14:00.
Detailed specification - 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 |
Technical modeling of the magnet - data
These values are the outcome of a mathematical analysis. Results rely on algorithms for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Treat these calculations as a supplementary guide for designers.
Table 1: Static pull force (force 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: Vertical assembly (shearing) - 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 resistance (material behavior) - 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: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 20x8x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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: Protective zones (electronics) - precautionary measures
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 |
| Mobile device | 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: Corrosion resistance
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: Underwater work (magnet fishing)
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. Vertical hold
*Note: On a vertical wall, the magnet retains just ~20% of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Thermal stability
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.52
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 |
View also deals
Advantages and disadvantages of neodymium magnets.
Advantages
- Their magnetic field remains stable, and after approximately ten years it decreases only by ~1% (according to research),
- They retain their magnetic properties even under external field action,
- In other words, due to the shiny finish of silver, the element becomes visually attractive,
- The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
- Thanks to freedom in constructing and the capacity to customize to complex applications,
- Significant place in modern technologies – they are utilized in hard drives, electromotive mechanisms, diagnostic systems, also industrial machines.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
- Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
- Limited possibility of creating threads in the magnet and complicated shapes - recommended is cover - mounting mechanism.
- Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical when they are in the body.
- Due to expensive raw materials, their price is higher than average,
Holding force characteristics
Maximum magnetic pulling force – what it depends on?
- on a block made of mild steel, effectively closing the magnetic flux
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- with an ground contact surface
- without the slightest air gap between the magnet and steel
- during detachment in a direction perpendicular to the mounting surface
- at ambient temperature approx. 20 degrees Celsius
Lifting capacity in practice – influencing factors
- Clearance – existence of any layer (rust, tape, gap) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
- 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 maximum value.
- Plate thickness – too thin plate causes magnetic saturation, causing part of the flux to be escaped into the air.
- Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
- Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
- Temperature – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.
Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet and the plate reduces the load capacity.
Safe handling of NdFeB magnets
Shattering risk
Watch out for shards. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.
Fire risk
Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.
Conscious usage
Before use, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.
Safe distance
Very strong magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.
Physical harm
Risk of injury: The pulling power is so immense that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.
Nickel allergy
Certain individuals experience a sensitization to nickel, which is the common plating for NdFeB magnets. Prolonged contact may cause an allergic reaction. We strongly advise use protective gloves.
Swallowing risk
Absolutely keep magnets away from children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are fatal.
Heat warning
Control the heat. Heating the magnet to high heat will destroy its properties and strength.
Life threat
Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.
Phone sensors
Note: neodymium magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, device, and GPS.
