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
bulk discounts:
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Technical parameters of the product - 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 analysis of the magnet - technical parameters
The following information constitute the outcome of a engineering analysis. Values are based on algorithms for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Please consider these calculations as a supplementary guide during assembly planning.
Table 1: Static force (force vs distance) - interaction chart
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
|
warning |
| 5 mm |
3114 Gs
311.4 mT
|
5.12 kg / 5120.3 g
50.2 N
|
warning |
| 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: Shear 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: Wall mounting (shearing) - 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) - sheet metal selection
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 (stability) - thermal limit
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: Magnet-Magnet interaction (repulsion) - 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) - precautionary measures
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 |
| Phone / Smartphone | 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: Impact energy (kinetic energy) - warning
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: Construction 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: Submerged application
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
*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.
3. Temperature resistance
*For N38 grade, the critical limit 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.
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 |
See also proposals
Pros as well as cons of neodymium magnets.
Pros
- They do not lose power, even during nearly ten years – the reduction in strength is only ~1% (based on measurements),
- They retain their magnetic properties even under strong external field,
- In other words, due to the glossy finish of gold, the element looks attractive,
- They feature high magnetic induction at the operating surface, which increases their power,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
- Due to the option of flexible molding and adaptation to individualized projects, NdFeB magnets can be manufactured in a wide range of shapes and sizes, which makes them more universal,
- Significant place in high-tech industry – they are utilized in hard drives, electromotive mechanisms, diagnostic systems, and industrial machines.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Cons
- At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's 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
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Limited ability of creating threads in the magnet and complex forms - preferred is casing - magnetic holder.
- Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical after entering the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities
Holding force characteristics
Magnetic strength at its maximum – what affects it?
- on a block made of mild steel, perfectly concentrating the magnetic field
- whose thickness equals approx. 10 mm
- characterized by smoothness
- under conditions of no distance (surface-to-surface)
- during pulling in a direction perpendicular to the mounting surface
- in stable room temperature
Magnet lifting force in use – key factors
- Gap between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
- Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
- Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.
Safety rules for work with neodymium magnets
Operating temperature
Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.
Sensitization to coating
Studies show that nickel (the usual finish) is a strong allergen. For allergy sufferers, prevent direct skin contact and select versions in plastic housing.
Powerful field
Exercise caution. Rare earth magnets act from a distance and snap with massive power, often faster than you can react.
Mechanical processing
Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.
GPS and phone interference
Navigation devices and mobile phones are extremely susceptible to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.
No play value
Product intended for adults. Small elements can be swallowed, leading to intestinal necrosis. Keep out of reach of kids and pets.
Danger to pacemakers
Warning for patients: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.
Physical harm
Danger of trauma: The pulling power is so great that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
Beware of splinters
Neodymium magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them shattering into small pieces.
Electronic devices
Very strong magnetic fields can destroy records on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.
