MPL 20x20x20 / N38 - lamellar magnet
lamellar magnet
Catalog no 020129
GTIN/EAN: 5906301811350
length
20 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
60 g
Magnetization Direction
↑ axial
Load capacity
15.40 kg / 151.12 N
Magnetic Induction
540.22 mT / 5402 Gs
Coating
[NiCuNi] Nickel
33.21 ZŁ with VAT / pcs + price for transport
27.00 ZŁ net + 23% VAT / pcs
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Technical parameters - MPL 20x20x20 / N38 - lamellar magnet
Specification / characteristics - MPL 20x20x20 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020129 |
| GTIN/EAN | 5906301811350 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 20 mm [±0,1 mm] |
| Width | 20 mm [±0,1 mm] |
| Height | 20 mm [±0,1 mm] |
| Weight | 60 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 15.40 kg / 151.12 N |
| Magnetic Induction ~ ? | 540.22 mT / 5402 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 simulation of the assembly - report
These data are the result of a physical calculation. Values are based on models for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these calculations as a supplementary guide for designers.
Table 1: Static pull force (pull vs gap) - power drop
MPL 20x20x20 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
5400 Gs
540.0 mT
|
15.40 kg / 15400.0 g
151.1 N
|
critical level |
| 1 mm |
4910 Gs
491.0 mT
|
12.73 kg / 12732.2 g
124.9 N
|
critical level |
| 2 mm |
4423 Gs
442.3 mT
|
10.33 kg / 10328.3 g
101.3 N
|
critical level |
| 3 mm |
3955 Gs
395.5 mT
|
8.26 kg / 8258.3 g
81.0 N
|
strong |
| 5 mm |
3114 Gs
311.4 mT
|
5.12 kg / 5120.3 g
50.2 N
|
strong |
| 10 mm |
1671 Gs
167.1 mT
|
1.48 kg / 1475.0 g
14.5 N
|
weak grip |
| 15 mm |
936 Gs
93.6 mT
|
0.46 kg / 463.0 g
4.5 N
|
weak grip |
| 20 mm |
562 Gs
56.2 mT
|
0.17 kg / 167.1 g
1.6 N
|
weak grip |
| 30 mm |
244 Gs
24.4 mT
|
0.03 kg / 31.3 g
0.3 N
|
weak grip |
| 50 mm |
73 Gs
7.3 mT
|
0.00 kg / 2.8 g
0.0 N
|
weak grip |
Table 2: Vertical hold (vertical surface)
MPL 20x20x20 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
3.08 kg / 3080.0 g
30.2 N
|
| 1 mm | Stal (~0.2) |
2.55 kg / 2546.0 g
25.0 N
|
| 2 mm | Stal (~0.2) |
2.07 kg / 2066.0 g
20.3 N
|
| 3 mm | Stal (~0.2) |
1.65 kg / 1652.0 g
16.2 N
|
| 5 mm | Stal (~0.2) |
1.02 kg / 1024.0 g
10.0 N
|
| 10 mm | Stal (~0.2) |
0.30 kg / 296.0 g
2.9 N
|
| 15 mm | Stal (~0.2) |
0.09 kg / 92.0 g
0.9 N
|
| 20 mm | Stal (~0.2) |
0.03 kg / 34.0 g
0.3 N
|
| 30 mm | Stal (~0.2) |
0.01 kg / 6.0 g
0.1 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 20x20x20 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
4.62 kg / 4620.0 g
45.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
3.08 kg / 3080.0 g
30.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.54 kg / 1540.0 g
15.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
7.70 kg / 7700.0 g
75.5 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 20x20x20 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.77 kg / 770.0 g
7.6 N
|
| 1 mm |
|
1.93 kg / 1925.0 g
18.9 N
|
| 2 mm |
|
3.85 kg / 3850.0 g
37.8 N
|
| 5 mm |
|
9.63 kg / 9625.0 g
94.4 N
|
| 10 mm |
|
15.40 kg / 15400.0 g
151.1 N
|
Table 5: Thermal stability (material behavior) - resistance threshold
MPL 20x20x20 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
15.40 kg / 15400.0 g
151.1 N
|
OK |
| 40 °C | -2.2% |
15.06 kg / 15061.2 g
147.8 N
|
OK |
| 60 °C | -4.4% |
14.72 kg / 14722.4 g
144.4 N
|
OK |
| 80 °C | -6.6% |
14.38 kg / 14383.6 g
141.1 N
|
|
| 100 °C | -28.8% |
10.96 kg / 10964.8 g
107.6 N
|
Table 6: Two magnets (attraction) - field collision
MPL 20x20x20 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
71.92 kg / 71917 g
705.5 N
5 962 Gs
|
N/A |
| 1 mm |
65.60 kg / 65602 g
643.6 N
10 316 Gs
|
59.04 kg / 59042 g
579.2 N
~0 Gs
|
| 2 mm |
59.46 kg / 59458 g
583.3 N
9 821 Gs
|
53.51 kg / 53513 g
525.0 N
~0 Gs
|
| 3 mm |
53.66 kg / 53658 g
526.4 N
9 329 Gs
|
48.29 kg / 48293 g
473.8 N
~0 Gs
|
| 5 mm |
43.20 kg / 43199 g
423.8 N
8 371 Gs
|
38.88 kg / 38879 g
381.4 N
~0 Gs
|
| 10 mm |
23.91 kg / 23912 g
234.6 N
6 228 Gs
|
21.52 kg / 21520 g
211.1 N
~0 Gs
|
| 20 mm |
6.89 kg / 6888 g
67.6 N
3 343 Gs
|
6.20 kg / 6199 g
60.8 N
~0 Gs
|
| 50 mm |
0.32 kg / 320 g
3.1 N
721 Gs
|
0.29 kg / 288 g
2.8 N
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MPL 20x20x20 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 14.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 11.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 8.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 6.5 cm |
| Car key | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Collisions (kinetic energy) - collision effects
MPL 20x20x20 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
17.10 km/h
(4.75 m/s)
|
0.68 J | |
| 30 mm |
28.02 km/h
(7.78 m/s)
|
1.82 J | |
| 50 mm |
36.13 km/h
(10.04 m/s)
|
3.02 J | |
| 100 mm |
51.09 km/h
(14.19 m/s)
|
6.04 J |
Table 9: Coating parameters (durability)
MPL 20x20x20 / 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 20x20x20 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 22 017 Mx | 220.2 µWb |
| Pc Coefficient | 0.84 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MPL 20x20x20 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 15.40 kg | Standard |
| Water (riverbed) |
17.63 kg
(+2.23 kg Buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Thermal stability
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.84
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.
Elemental analysis
| 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 proposals
Pros as well as cons of rare earth magnets.
Strengths
- Their strength is durable, and after around ten years it decreases only by ~1% (according to research),
- They have excellent resistance to magnetic field loss as a result of opposing magnetic fields,
- In other words, due to the aesthetic surface of gold, the element gains visual value,
- Neodymium magnets deliver maximum magnetic induction on a small surface, which increases force concentration,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to flexibility in forming and the capacity to customize to individual projects,
- Universal use in future technologies – they are commonly used in mass storage devices, electromotive mechanisms, diagnostic systems, and other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions
Limitations
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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 start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
- Limited ability of producing nuts in the magnet and complicated shapes - recommended is cover - magnet mounting.
- Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small elements of these products are able to be problematic in diagnostics medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Lifting parameters
Highest magnetic holding force – what contributes to it?
- with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
- with a cross-section of at least 10 mm
- with an ideally smooth touching surface
- under conditions of ideal adhesion (surface-to-surface)
- during detachment in a direction perpendicular to the mounting surface
- in neutral thermal conditions
Determinants of lifting force in real conditions
- Distance – existence of any layer (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be lost into the air.
- Steel type – mild steel gives the best results. Alloy admixtures reduce magnetic properties and lifting capacity.
- Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
- Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate decreases the holding force.
Safety rules for work with neodymium magnets
Choking Hazard
Product intended for adults. Small elements can be swallowed, leading to intestinal necrosis. Store away from children and animals.
ICD Warning
People with a ICD should keep an safe separation from magnets. The magnetic field can stop the operation of the implant.
Eye protection
NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets will cause them breaking into shards.
Allergic reactions
Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction occurs, cease working with magnets and use protective gear.
Heat warning
Avoid heat. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).
Dust is flammable
Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Respect the power
Be careful. Neodymium magnets act from a long distance and snap with huge force, often quicker than you can move away.
Physical harm
Protect your hands. Two large magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!
Cards and drives
Do not bring magnets near a wallet, computer, or screen. The magnetism can destroy these devices and wipe information from cards.
GPS and phone interference
Be aware: neodymium magnets generate a field that disrupts precision electronics. Keep a safe distance from your mobile, device, and navigation systems.
