MPL 20x8x4 / N38 - lamellar magnet
lamellar magnet
Catalog no 020133
GTIN/EAN: 5906301811398
length
20 mm [±0,1 mm]
Width
8 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
4.8 g
Magnetization Direction
↑ axial
Load capacity
4.79 kg / 46.98 N
Magnetic Induction
336.99 mT / 3370 Gs
Coating
[NiCuNi] Nickel
3.67 ZŁ with VAT / pcs + price for transport
2.98 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - MPL 20x8x4 / N38 - lamellar magnet
Specification / characteristics - MPL 20x8x4 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020133 |
| GTIN/EAN | 5906301811398 |
| 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 | 4 mm [±0,1 mm] |
| Weight | 4.8 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 4.79 kg / 46.98 N |
| Magnetic Induction ~ ? | 336.99 mT / 3370 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 product - data
Presented information constitute the outcome of a mathematical analysis. Results rely on algorithms for the material Nd2Fe14B. Real-world parameters may deviate from the simulation results. Use these data as a reference point during assembly planning.
Table 1: Static force (force vs gap) - characteristics
MPL 20x8x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3368 Gs
336.8 mT
|
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
|
warning |
| 1 mm |
2818 Gs
281.8 mT
|
3.35 kg / 7.39 lbs
3352.3 g / 32.9 N
|
warning |
| 2 mm |
2266 Gs
226.6 mT
|
2.17 kg / 4.78 lbs
2167.6 g / 21.3 N
|
warning |
| 3 mm |
1794 Gs
179.4 mT
|
1.36 kg / 3.00 lbs
1358.6 g / 13.3 N
|
safe |
| 5 mm |
1130 Gs
113.0 mT
|
0.54 kg / 1.19 lbs
538.9 g / 5.3 N
|
safe |
| 10 mm |
416 Gs
41.6 mT
|
0.07 kg / 0.16 lbs
73.0 g / 0.7 N
|
safe |
| 15 mm |
187 Gs
18.7 mT
|
0.01 kg / 0.03 lbs
14.7 g / 0.1 N
|
safe |
| 20 mm |
97 Gs
9.7 mT
|
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
safe |
| 30 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 lbs
0.5 g / 0.0 N
|
safe |
| 50 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Sliding hold (vertical surface)
MPL 20x8x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.96 kg / 2.11 lbs
958.0 g / 9.4 N
|
| 1 mm | Stal (~0.2) |
0.67 kg / 1.48 lbs
670.0 g / 6.6 N
|
| 2 mm | Stal (~0.2) |
0.43 kg / 0.96 lbs
434.0 g / 4.3 N
|
| 3 mm | Stal (~0.2) |
0.27 kg / 0.60 lbs
272.0 g / 2.7 N
|
| 5 mm | Stal (~0.2) |
0.11 kg / 0.24 lbs
108.0 g / 1.1 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
14.0 g / 0.1 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 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) - vertical pull
MPL 20x8x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.44 kg / 3.17 lbs
1437.0 g / 14.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.96 kg / 2.11 lbs
958.0 g / 9.4 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.48 kg / 1.06 lbs
479.0 g / 4.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.40 kg / 5.28 lbs
2395.0 g / 23.5 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MPL 20x8x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.48 kg / 1.06 lbs
479.0 g / 4.7 N
|
| 1 mm |
|
1.20 kg / 2.64 lbs
1197.5 g / 11.7 N
|
| 2 mm |
|
2.40 kg / 5.28 lbs
2395.0 g / 23.5 N
|
| 3 mm |
|
3.59 kg / 7.92 lbs
3592.5 g / 35.2 N
|
| 5 mm |
|
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
|
| 10 mm |
|
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
|
| 11 mm |
|
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
|
| 12 mm |
|
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
|
Table 5: Thermal stability (stability) - power drop
MPL 20x8x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
|
OK |
| 40 °C | -2.2% |
4.68 kg / 10.33 lbs
4684.6 g / 46.0 N
|
OK |
| 60 °C | -4.4% |
4.58 kg / 10.10 lbs
4579.2 g / 44.9 N
|
|
| 80 °C | -6.6% |
4.47 kg / 9.86 lbs
4473.9 g / 43.9 N
|
|
| 100 °C | -28.8% |
3.41 kg / 7.52 lbs
3410.5 g / 33.5 N
|
Table 6: Two magnets (attraction) - field range
MPL 20x8x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
11.19 kg / 24.67 lbs
4 784 Gs
|
1.68 kg / 3.70 lbs
1678 g / 16.5 N
|
N/A |
| 1 mm |
9.49 kg / 20.93 lbs
6 205 Gs
|
1.42 kg / 3.14 lbs
1424 g / 14.0 N
|
8.54 kg / 18.84 lbs
~0 Gs
|
| 2 mm |
7.83 kg / 17.26 lbs
5 635 Gs
|
1.17 kg / 2.59 lbs
1175 g / 11.5 N
|
7.05 kg / 15.54 lbs
~0 Gs
|
| 3 mm |
6.34 kg / 13.97 lbs
5 069 Gs
|
0.95 kg / 2.10 lbs
951 g / 9.3 N
|
5.70 kg / 12.57 lbs
~0 Gs
|
| 5 mm |
4.02 kg / 8.85 lbs
4 035 Gs
|
0.60 kg / 1.33 lbs
602 g / 5.9 N
|
3.61 kg / 7.97 lbs
~0 Gs
|
| 10 mm |
1.26 kg / 2.78 lbs
2 259 Gs
|
0.19 kg / 0.42 lbs
189 g / 1.9 N
|
1.13 kg / 2.50 lbs
~0 Gs
|
| 20 mm |
0.17 kg / 0.38 lbs
832 Gs
|
0.03 kg / 0.06 lbs
26 g / 0.3 N
|
0.15 kg / 0.34 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 lbs
112 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
70 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
46 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
32 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
23 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
17 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 20x8x4 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 4.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.0 cm |
| Car key | 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 (cracking risk) - collision effects
MPL 20x8x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
32.16 km/h
(8.93 m/s)
|
0.19 J | |
| 30 mm |
55.18 km/h
(15.33 m/s)
|
0.56 J | |
| 50 mm |
71.24 km/h
(19.79 m/s)
|
0.94 J | |
| 100 mm |
100.75 km/h
(27.99 m/s)
|
1.88 J |
Table 9: Anti-corrosion coating durability
MPL 20x8x4 / 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 20x8x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 277 Mx | 52.8 µWb |
| Pc Coefficient | 0.38 | Low (Flat) |
Table 11: Submerged application
MPL 20x8x4 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 4.79 kg | Standard |
| Water (riverbed) |
5.48 kg
(+0.69 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.
3. Thermal stability
*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) = 0.38
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.
Material specification
| 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 |
Other offers
Advantages and disadvantages of neodymium magnets.
Benefits
- Their power is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
- Neodymium magnets remain extremely resistant to demagnetization caused by magnetic disturbances,
- By covering with a shiny coating of nickel, the element has an professional look,
- Magnets are characterized by extremely high magnetic induction on the working surface,
- Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to modularity in forming and the ability to adapt to specific needs,
- Key role in future technologies – they serve a role in mass storage devices, electric drive systems, medical equipment, also technologically advanced constructions.
- Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,
Disadvantages
- At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- Limited possibility of producing nuts in the magnet and complex forms - preferred is casing - mounting mechanism.
- Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- on a base made of mild steel, optimally conducting the magnetic flux
- with a thickness minimum 10 mm
- with an ideally smooth contact surface
- under conditions of gap-free contact (metal-to-metal)
- under perpendicular force direction (90-degree angle)
- in stable room temperature
Lifting capacity in real conditions – factors
- Distance (betwixt the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
- Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Chemical composition of the base – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and holding force.
- Surface finish – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
- Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate reduces the load capacity.
Safety rules for work with neodymium magnets
Serious injuries
Mind your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!
Danger to the youngest
Absolutely keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are tragic.
Handling guide
Handle with care. Neodymium magnets act from a long distance and snap with massive power, often faster than you can move away.
Warning for allergy sufferers
Medical facts indicate that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, prevent touching magnets with bare hands or choose encased magnets.
Thermal limits
Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.
Keep away from computers
Do not bring magnets near a purse, computer, or screen. The magnetic field can destroy these devices and erase data from cards.
Health Danger
Medical warning: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Eye protection
Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Flammability
Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Keep away from electronics
Note: rare earth magnets generate a field that confuses sensitive sensors. Keep a safe distance from your mobile, tablet, and navigation systems.
