MPL 20x10x5 / N38 - lamellar magnet
lamellar magnet
Catalog no 020128
GTIN/EAN: 5906301811343
length
20 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
7.5 g
Magnetization Direction
↑ axial
Load capacity
6.15 kg / 60.31 N
Magnetic Induction
349.47 mT / 3495 Gs
Coating
[NiCuNi] Nickel
4.54 ZŁ with VAT / pcs + price for transport
3.69 ZŁ net + 23% VAT / pcs
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Technical of the product - MPL 20x10x5 / N38 - lamellar magnet
Specification / characteristics - MPL 20x10x5 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020128 |
| GTIN/EAN | 5906301811343 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 20 mm [±0,1 mm] |
| Width | 10 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 7.5 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 6.15 kg / 60.31 N |
| Magnetic Induction ~ ? | 349.47 mT / 3495 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 - report
These information constitute the direct effect of a mathematical calculation. Values were calculated on algorithms for the class Nd2Fe14B. Operational performance may differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.
Table 1: Static force (pull vs gap) - power drop
MPL 20x10x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3493 Gs
349.3 mT
|
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
|
warning |
| 1 mm |
3035 Gs
303.5 mT
|
4.64 kg / 10.23 lbs
4641.8 g / 45.5 N
|
warning |
| 2 mm |
2558 Gs
255.8 mT
|
3.30 kg / 7.27 lbs
3298.0 g / 32.4 N
|
warning |
| 3 mm |
2120 Gs
212.0 mT
|
2.26 kg / 4.99 lbs
2264.8 g / 22.2 N
|
warning |
| 5 mm |
1433 Gs
143.3 mT
|
1.03 kg / 2.28 lbs
1034.5 g / 10.1 N
|
low risk |
| 10 mm |
574 Gs
57.4 mT
|
0.17 kg / 0.37 lbs
166.1 g / 1.6 N
|
low risk |
| 15 mm |
267 Gs
26.7 mT
|
0.04 kg / 0.08 lbs
35.9 g / 0.4 N
|
low risk |
| 20 mm |
141 Gs
14.1 mT
|
0.01 kg / 0.02 lbs
10.1 g / 0.1 N
|
low risk |
| 30 mm |
52 Gs
5.2 mT
|
0.00 kg / 0.00 lbs
1.4 g / 0.0 N
|
low risk |
| 50 mm |
13 Gs
1.3 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
low risk |
Table 2: Sliding hold (vertical surface)
MPL 20x10x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.23 kg / 2.71 lbs
1230.0 g / 12.1 N
|
| 1 mm | Stal (~0.2) |
0.93 kg / 2.05 lbs
928.0 g / 9.1 N
|
| 2 mm | Stal (~0.2) |
0.66 kg / 1.46 lbs
660.0 g / 6.5 N
|
| 3 mm | Stal (~0.2) |
0.45 kg / 1.00 lbs
452.0 g / 4.4 N
|
| 5 mm | Stal (~0.2) |
0.21 kg / 0.45 lbs
206.0 g / 2.0 N
|
| 10 mm | Stal (~0.2) |
0.03 kg / 0.07 lbs
34.0 g / 0.3 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
8.0 g / 0.1 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 (shearing) - vertical pull
MPL 20x10x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.85 kg / 4.07 lbs
1845.0 g / 18.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.23 kg / 2.71 lbs
1230.0 g / 12.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.62 kg / 1.36 lbs
615.0 g / 6.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.08 kg / 6.78 lbs
3075.0 g / 30.2 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MPL 20x10x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.62 kg / 1.36 lbs
615.0 g / 6.0 N
|
| 1 mm |
|
1.54 kg / 3.39 lbs
1537.5 g / 15.1 N
|
| 2 mm |
|
3.08 kg / 6.78 lbs
3075.0 g / 30.2 N
|
| 3 mm |
|
4.61 kg / 10.17 lbs
4612.5 g / 45.2 N
|
| 5 mm |
|
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
|
| 10 mm |
|
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
|
| 11 mm |
|
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
|
| 12 mm |
|
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MPL 20x10x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
|
OK |
| 40 °C | -2.2% |
6.01 kg / 13.26 lbs
6014.7 g / 59.0 N
|
OK |
| 60 °C | -4.4% |
5.88 kg / 12.96 lbs
5879.4 g / 57.7 N
|
|
| 80 °C | -6.6% |
5.74 kg / 12.66 lbs
5744.1 g / 56.3 N
|
|
| 100 °C | -28.8% |
4.38 kg / 9.65 lbs
4378.8 g / 43.0 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 20x10x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
15.04 kg / 33.17 lbs
4 923 Gs
|
2.26 kg / 4.98 lbs
2257 g / 22.1 N
|
N/A |
| 1 mm |
13.20 kg / 29.11 lbs
6 544 Gs
|
1.98 kg / 4.37 lbs
1980 g / 19.4 N
|
11.88 kg / 26.19 lbs
~0 Gs
|
| 2 mm |
11.36 kg / 25.03 lbs
6 069 Gs
|
1.70 kg / 3.76 lbs
1703 g / 16.7 N
|
10.22 kg / 22.53 lbs
~0 Gs
|
| 3 mm |
9.63 kg / 21.22 lbs
5 588 Gs
|
1.44 kg / 3.18 lbs
1444 g / 14.2 N
|
8.66 kg / 19.10 lbs
~0 Gs
|
| 5 mm |
6.71 kg / 14.78 lbs
4 664 Gs
|
1.01 kg / 2.22 lbs
1006 g / 9.9 N
|
6.03 kg / 13.30 lbs
~0 Gs
|
| 10 mm |
2.53 kg / 5.58 lbs
2 865 Gs
|
0.38 kg / 0.84 lbs
380 g / 3.7 N
|
2.28 kg / 5.02 lbs
~0 Gs
|
| 20 mm |
0.41 kg / 0.90 lbs
1 148 Gs
|
0.06 kg / 0.13 lbs
61 g / 0.6 N
|
0.37 kg / 0.81 lbs
~0 Gs
|
| 50 mm |
0.01 kg / 0.02 lbs
165 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
104 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
69 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
48 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
35 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
26 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (implants) - warnings
MPL 20x10x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 7.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 6.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 4.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.5 cm |
| Remote | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MPL 20x10x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
29.36 km/h
(8.16 m/s)
|
0.25 J | |
| 30 mm |
50.03 km/h
(13.90 m/s)
|
0.72 J | |
| 50 mm |
64.58 km/h
(17.94 m/s)
|
1.21 J | |
| 100 mm |
91.32 km/h
(25.37 m/s)
|
2.41 J |
Table 9: Coating parameters (durability)
MPL 20x10x5 / 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 20x10x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 7 031 Mx | 70.3 µWb |
| Pc Coefficient | 0.42 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 20x10x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 6.15 kg | Standard |
| Water (riverbed) |
7.04 kg
(+0.89 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Caution: On a vertical wall, the magnet retains merely ~20% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) severely reduces 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) = 0.42
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Advantages as well as disadvantages of rare earth magnets.
Pros
- Their power is maintained, and after around 10 years it drops only by ~1% (theoretically),
- Magnets perfectly resist against demagnetization caused by foreign field sources,
- Thanks to the smooth finish, the plating of Ni-Cu-Ni, gold, or silver gives an modern appearance,
- Magnetic induction on the working layer of the magnet is strong,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Thanks to the possibility of free molding and adaptation to individualized needs, neodymium magnets can be created in a wide range of forms and dimensions, which makes them more universal,
- Significant place in innovative solutions – they are utilized in mass storage devices, motor assemblies, advanced medical instruments, also industrial machines.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Disadvantages
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
- When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- Due to limitations in creating threads and complex shapes in magnets, we recommend using casing - magnetic holder.
- Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these products can be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Magnetic strength at its maximum – what contributes to it?
- with the use of a yoke made of special test steel, guaranteeing maximum field concentration
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- with an ideally smooth contact surface
- under conditions of gap-free contact (surface-to-surface)
- under perpendicular force vector (90-degree angle)
- at standard ambient temperature
Impact of factors on magnetic holding capacity in practice
- Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
- Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
- Plate material – low-carbon steel attracts best. Alloy steels lower magnetic permeability and holding force.
- Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
- Thermal factor – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity was determined by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.
Precautions when working with neodymium magnets
Power loss in heat
Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.
Conscious usage
Handle with care. Neodymium magnets act from a long distance and connect with massive power, often faster than you can move away.
Fragile material
Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Wear goggles.
Impact on smartphones
GPS units and smartphones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.
Medical interference
Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
Magnetic media
Data protection: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).
Pinching danger
Risk of injury: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.
Fire risk
Fire hazard: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.
Swallowing risk
Product intended for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Store out of reach of children and animals.
Skin irritation risks
It is widely known that nickel (the usual finish) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands or select coated magnets.
