MPL 30x20x20 / N38 - lamellar magnet
lamellar magnet
Catalog no 020142
GTIN/EAN: 5906301811480
length
30 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
90 g
Magnetization Direction
↑ axial
Load capacity
24.27 kg / 238.07 N
Magnetic Induction
512.53 mT / 5125 Gs
Coating
[NiCuNi] Nickel
43.22 ZŁ with VAT / pcs + price for transport
35.14 ZŁ net + 23% VAT / pcs
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Technical details - MPL 30x20x20 / N38 - lamellar magnet
Specification / characteristics - MPL 30x20x20 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020142 |
| GTIN/EAN | 5906301811480 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 30 mm [±0,1 mm] |
| Width | 20 mm [±0,1 mm] |
| Height | 20 mm [±0,1 mm] |
| Weight | 90 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 24.27 kg / 238.07 N |
| Magnetic Induction ~ ? | 512.53 mT / 5125 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 |
Physical modeling of the assembly - technical parameters
Presented information constitute the outcome of a engineering analysis. Values are based on algorithms for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap for designers.
Table 1: Static pull force (force vs gap) - interaction chart
MPL 30x20x20 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5124 Gs
512.4 mT
|
24.27 kg / 53.51 lbs
24270.0 g / 238.1 N
|
critical level |
| 1 mm |
4730 Gs
473.0 mT
|
20.68 kg / 45.60 lbs
20685.0 g / 202.9 N
|
critical level |
| 2 mm |
4335 Gs
433.5 mT
|
17.37 kg / 38.30 lbs
17370.7 g / 170.4 N
|
critical level |
| 3 mm |
3950 Gs
395.0 mT
|
14.43 kg / 31.80 lbs
14425.2 g / 141.5 N
|
critical level |
| 5 mm |
3240 Gs
324.0 mT
|
9.71 kg / 21.40 lbs
9706.2 g / 95.2 N
|
warning |
| 10 mm |
1923 Gs
192.3 mT
|
3.42 kg / 7.53 lbs
3417.4 g / 33.5 N
|
warning |
| 15 mm |
1163 Gs
116.3 mT
|
1.25 kg / 2.76 lbs
1250.2 g / 12.3 N
|
safe |
| 20 mm |
736 Gs
73.6 mT
|
0.50 kg / 1.10 lbs
500.4 g / 4.9 N
|
safe |
| 30 mm |
338 Gs
33.8 mT
|
0.11 kg / 0.23 lbs
105.3 g / 1.0 N
|
safe |
| 50 mm |
106 Gs
10.6 mT
|
0.01 kg / 0.02 lbs
10.3 g / 0.1 N
|
safe |
Table 2: Sliding force (wall)
MPL 30x20x20 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.85 kg / 10.70 lbs
4854.0 g / 47.6 N
|
| 1 mm | Stal (~0.2) |
4.14 kg / 9.12 lbs
4136.0 g / 40.6 N
|
| 2 mm | Stal (~0.2) |
3.47 kg / 7.66 lbs
3474.0 g / 34.1 N
|
| 3 mm | Stal (~0.2) |
2.89 kg / 6.36 lbs
2886.0 g / 28.3 N
|
| 5 mm | Stal (~0.2) |
1.94 kg / 4.28 lbs
1942.0 g / 19.1 N
|
| 10 mm | Stal (~0.2) |
0.68 kg / 1.51 lbs
684.0 g / 6.7 N
|
| 15 mm | Stal (~0.2) |
0.25 kg / 0.55 lbs
250.0 g / 2.5 N
|
| 20 mm | Stal (~0.2) |
0.10 kg / 0.22 lbs
100.0 g / 1.0 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.05 lbs
22.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MPL 30x20x20 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
7.28 kg / 16.05 lbs
7281.0 g / 71.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.85 kg / 10.70 lbs
4854.0 g / 47.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.43 kg / 5.35 lbs
2427.0 g / 23.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
12.14 kg / 26.75 lbs
12135.0 g / 119.0 N
|
Table 4: Steel thickness (substrate influence) - power losses
MPL 30x20x20 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.21 kg / 2.68 lbs
1213.5 g / 11.9 N
|
| 1 mm |
|
3.03 kg / 6.69 lbs
3033.8 g / 29.8 N
|
| 2 mm |
|
6.07 kg / 13.38 lbs
6067.5 g / 59.5 N
|
| 3 mm |
|
9.10 kg / 20.06 lbs
9101.3 g / 89.3 N
|
| 5 mm |
|
15.17 kg / 33.44 lbs
15168.8 g / 148.8 N
|
| 10 mm |
|
24.27 kg / 53.51 lbs
24270.0 g / 238.1 N
|
| 11 mm |
|
24.27 kg / 53.51 lbs
24270.0 g / 238.1 N
|
| 12 mm |
|
24.27 kg / 53.51 lbs
24270.0 g / 238.1 N
|
Table 5: Working in heat (stability) - power drop
MPL 30x20x20 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
24.27 kg / 53.51 lbs
24270.0 g / 238.1 N
|
OK |
| 40 °C | -2.2% |
23.74 kg / 52.33 lbs
23736.1 g / 232.9 N
|
OK |
| 60 °C | -4.4% |
23.20 kg / 51.15 lbs
23202.1 g / 227.6 N
|
OK |
| 80 °C | -6.6% |
22.67 kg / 49.97 lbs
22668.2 g / 222.4 N
|
|
| 100 °C | -28.8% |
17.28 kg / 38.10 lbs
17280.2 g / 169.5 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 30x20x20 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
97.11 kg / 214.09 lbs
5 859 Gs
|
14.57 kg / 32.11 lbs
14567 g / 142.9 N
|
N/A |
| 1 mm |
89.88 kg / 198.15 lbs
9 859 Gs
|
13.48 kg / 29.72 lbs
13482 g / 132.3 N
|
80.89 kg / 178.34 lbs
~0 Gs
|
| 2 mm |
82.77 kg / 182.47 lbs
9 461 Gs
|
12.42 kg / 27.37 lbs
12415 g / 121.8 N
|
74.49 kg / 164.22 lbs
~0 Gs
|
| 3 mm |
75.96 kg / 167.47 lbs
9 063 Gs
|
11.39 kg / 25.12 lbs
11394 g / 111.8 N
|
68.37 kg / 150.72 lbs
~0 Gs
|
| 5 mm |
63.42 kg / 139.81 lbs
8 281 Gs
|
9.51 kg / 20.97 lbs
9513 g / 93.3 N
|
57.08 kg / 125.83 lbs
~0 Gs
|
| 10 mm |
38.84 kg / 85.62 lbs
6 481 Gs
|
5.83 kg / 12.84 lbs
5826 g / 57.1 N
|
34.95 kg / 77.06 lbs
~0 Gs
|
| 20 mm |
13.67 kg / 30.15 lbs
3 845 Gs
|
2.05 kg / 4.52 lbs
2051 g / 20.1 N
|
12.31 kg / 27.13 lbs
~0 Gs
|
| 50 mm |
0.88 kg / 1.94 lbs
976 Gs
|
0.13 kg / 0.29 lbs
132 g / 1.3 N
|
0.79 kg / 1.75 lbs
~0 Gs
|
| 60 mm |
0.42 kg / 0.93 lbs
675 Gs
|
0.06 kg / 0.14 lbs
63 g / 0.6 N
|
0.38 kg / 0.84 lbs
~0 Gs
|
| 70 mm |
0.22 kg / 0.48 lbs
484 Gs
|
0.03 kg / 0.07 lbs
33 g / 0.3 N
|
0.20 kg / 0.43 lbs
~0 Gs
|
| 80 mm |
0.12 kg / 0.26 lbs
358 Gs
|
0.02 kg / 0.04 lbs
18 g / 0.2 N
|
0.11 kg / 0.24 lbs
~0 Gs
|
| 90 mm |
0.07 kg / 0.15 lbs
272 Gs
|
0.01 kg / 0.02 lbs
10 g / 0.1 N
|
0.06 kg / 0.14 lbs
~0 Gs
|
| 100 mm |
0.04 kg / 0.09 lbs
211 Gs
|
0.01 kg / 0.01 lbs
6 g / 0.1 N
|
0.04 kg / 0.08 lbs
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 30x20x20 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 16.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 12.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 10.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 7.5 cm |
| Remote | 50 Gs (5.0 mT) | 7.0 cm |
| Payment card | 400 Gs (40.0 mT) | 3.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.5 cm |
Table 8: Impact energy (cracking risk) - collision effects
MPL 30x20x20 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
17.96 km/h
(4.99 m/s)
|
1.12 J | |
| 30 mm |
28.76 km/h
(7.99 m/s)
|
2.87 J | |
| 50 mm |
37.04 km/h
(10.29 m/s)
|
4.76 J | |
| 100 mm |
52.37 km/h
(14.55 m/s)
|
9.52 J |
Table 9: Coating parameters (durability)
MPL 30x20x20 / 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 30x20x20 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 30 878 Mx | 308.8 µWb |
| Pc Coefficient | 0.74 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MPL 30x20x20 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 24.27 kg | Standard |
| Water (riverbed) |
27.79 kg
(+3.52 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Thermal stability
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.74
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% |
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 offers
Strengths as well as weaknesses of Nd2Fe14B magnets.
Benefits
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
- They do not lose their magnetic properties even under strong external field,
- The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to modularity in forming and the capacity to modify to individual projects,
- Universal use in innovative solutions – they find application in magnetic memories, drive modules, diagnostic systems, also modern systems.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Limitations
- At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- Limited possibility of creating threads in the magnet and complicated shapes - preferred is casing - magnetic holder.
- Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these products can complicate diagnosis medical after entering the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Lifting parameters
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
- possessing a massiveness of at least 10 mm to avoid saturation
- with a plane cleaned and smooth
- under conditions of no distance (surface-to-surface)
- during pulling in a direction perpendicular to the plane
- in temp. approx. 20°C
Magnet lifting force in use – key factors
- Air gap (between the magnet and the plate), as even a tiny distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
- Pull-off angle – note that the magnet holds strongest 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. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
- Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Thermal environment – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.
Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the load capacity.
H&S for magnets
ICD Warning
Individuals with a heart stimulator have to keep an absolute distance from magnets. The magnetism can disrupt the operation of the life-saving device.
Dust is flammable
Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.
Eye protection
Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.
Hand protection
Watch your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Be careful!
Immense force
Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.
Impact on smartphones
GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.
Maximum temperature
Avoid heat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).
Electronic devices
Powerful magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.
Keep away from children
Absolutely keep magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are tragic.
Allergic reactions
Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, cease handling magnets and wear gloves.
