MPL 20x5x5 / N38 - lamellar magnet
lamellar magnet
Catalog no 020132
GTIN/EAN: 5906301811381
length
20 mm [±0,1 mm]
Width
5 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
3.75 g
Magnetization Direction
↑ axial
Load capacity
4.42 kg / 43.32 N
Magnetic Induction
456.78 mT / 4568 Gs
Coating
[NiCuNi] Nickel
2.76 ZŁ with VAT / pcs + price for transport
2.24 ZŁ net + 23% VAT / pcs
bulk discounts:
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Detailed specification - MPL 20x5x5 / N38 - lamellar magnet
Specification / characteristics - MPL 20x5x5 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020132 |
| GTIN/EAN | 5906301811381 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 20 mm [±0,1 mm] |
| Width | 5 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 3.75 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 4.42 kg / 43.32 N |
| Magnetic Induction ~ ? | 456.78 mT / 4568 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 - technical parameters
The following data are the outcome of a physical simulation. Results are based on models for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Use these data as a supplementary guide for designers.
Table 1: Static force (force vs distance) - interaction chart
MPL 20x5x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4563 Gs
456.3 mT
|
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
|
medium risk |
| 1 mm |
3323 Gs
332.3 mT
|
2.34 kg / 5.17 pounds
2344.7 g / 23.0 N
|
medium risk |
| 2 mm |
2341 Gs
234.1 mT
|
1.16 kg / 2.56 pounds
1163.0 g / 11.4 N
|
low risk |
| 3 mm |
1678 Gs
167.8 mT
|
0.60 kg / 1.32 pounds
597.4 g / 5.9 N
|
low risk |
| 5 mm |
944 Gs
94.4 mT
|
0.19 kg / 0.42 pounds
189.2 g / 1.9 N
|
low risk |
| 10 mm |
320 Gs
32.0 mT
|
0.02 kg / 0.05 pounds
21.7 g / 0.2 N
|
low risk |
| 15 mm |
141 Gs
14.1 mT
|
0.00 kg / 0.01 pounds
4.2 g / 0.0 N
|
low risk |
| 20 mm |
73 Gs
7.3 mT
|
0.00 kg / 0.00 pounds
1.1 g / 0.0 N
|
low risk |
| 30 mm |
26 Gs
2.6 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
low risk |
| 50 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Sliding load (wall)
MPL 20x5x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.88 kg / 1.95 pounds
884.0 g / 8.7 N
|
| 1 mm | Stal (~0.2) |
0.47 kg / 1.03 pounds
468.0 g / 4.6 N
|
| 2 mm | Stal (~0.2) |
0.23 kg / 0.51 pounds
232.0 g / 2.3 N
|
| 3 mm | Stal (~0.2) |
0.12 kg / 0.26 pounds
120.0 g / 1.2 N
|
| 5 mm | Stal (~0.2) |
0.04 kg / 0.08 pounds
38.0 g / 0.4 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MPL 20x5x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.33 kg / 2.92 pounds
1326.0 g / 13.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.88 kg / 1.95 pounds
884.0 g / 8.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.44 kg / 0.97 pounds
442.0 g / 4.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.21 kg / 4.87 pounds
2210.0 g / 21.7 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 20x5x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.44 kg / 0.97 pounds
442.0 g / 4.3 N
|
| 1 mm |
|
1.11 kg / 2.44 pounds
1105.0 g / 10.8 N
|
| 2 mm |
|
2.21 kg / 4.87 pounds
2210.0 g / 21.7 N
|
| 3 mm |
|
3.32 kg / 7.31 pounds
3315.0 g / 32.5 N
|
| 5 mm |
|
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
|
| 10 mm |
|
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
|
| 11 mm |
|
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
|
| 12 mm |
|
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
|
Table 5: Thermal stability (material behavior) - thermal limit
MPL 20x5x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.42 kg / 9.74 pounds
4420.0 g / 43.4 N
|
OK |
| 40 °C | -2.2% |
4.32 kg / 9.53 pounds
4322.8 g / 42.4 N
|
OK |
| 60 °C | -4.4% |
4.23 kg / 9.32 pounds
4225.5 g / 41.5 N
|
|
| 80 °C | -6.6% |
4.13 kg / 9.10 pounds
4128.3 g / 40.5 N
|
|
| 100 °C | -28.8% |
3.15 kg / 6.94 pounds
3147.0 g / 30.9 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 20x5x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
12.84 kg / 28.30 pounds
5 504 Gs
|
1.93 kg / 4.24 pounds
1925 g / 18.9 N
|
N/A |
| 1 mm |
9.53 kg / 21.01 pounds
7 864 Gs
|
1.43 kg / 3.15 pounds
1430 g / 14.0 N
|
8.58 kg / 18.91 pounds
~0 Gs
|
| 2 mm |
6.81 kg / 15.01 pounds
6 647 Gs
|
1.02 kg / 2.25 pounds
1021 g / 10.0 N
|
6.13 kg / 13.51 pounds
~0 Gs
|
| 3 mm |
4.79 kg / 10.57 pounds
5 577 Gs
|
0.72 kg / 1.59 pounds
719 g / 7.1 N
|
4.31 kg / 9.51 pounds
~0 Gs
|
| 5 mm |
2.40 kg / 5.30 pounds
3 949 Gs
|
0.36 kg / 0.79 pounds
360 g / 3.5 N
|
2.16 kg / 4.77 pounds
~0 Gs
|
| 10 mm |
0.55 kg / 1.21 pounds
1 888 Gs
|
0.08 kg / 0.18 pounds
82 g / 0.8 N
|
0.49 kg / 1.09 pounds
~0 Gs
|
| 20 mm |
0.06 kg / 0.14 pounds
640 Gs
|
0.01 kg / 0.02 pounds
9 g / 0.1 N
|
0.06 kg / 0.13 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
84 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
53 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
35 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
24 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
18 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
13 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MPL 20x5x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (cracking risk) - collision effects
MPL 20x5x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
34.73 km/h
(9.65 m/s)
|
0.17 J | |
| 30 mm |
59.97 km/h
(16.66 m/s)
|
0.52 J | |
| 50 mm |
77.42 km/h
(21.51 m/s)
|
0.87 J | |
| 100 mm |
109.49 km/h
(30.41 m/s)
|
1.73 J |
Table 9: Corrosion resistance
MPL 20x5x5 / 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 20x5x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 4 204 Mx | 42.0 µWb |
| Pc Coefficient | 0.54 | Low (Flat) |
Table 11: Submerged application
MPL 20x5x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 4.42 kg | Standard |
| Water (riverbed) |
5.06 kg
(+0.64 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical surface, the magnet holds just ~20% of its max power.
2. Steel thickness impact
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Temperature resistance
*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) = 0.54
The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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 |
Check out also offers
Strengths as well as weaknesses of Nd2Fe14B magnets.
Advantages
- They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
- They maintain their magnetic properties even under strong external field,
- A magnet with a smooth gold surface has an effective appearance,
- They are known for high magnetic induction at the operating surface, which increases their power,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of detailed modeling as well as adapting to specific conditions,
- Huge importance in future technologies – they are used in mass storage devices, electric motors, medical devices, also complex engineering applications.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
- Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 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 immune to moisture, in case of application outdoors
- Due to limitations in producing nuts and complicated shapes in magnets, we recommend using a housing - magnetic holder.
- Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
- With large orders the cost of neodymium magnets can be a barrier,
Pull force analysis
Best holding force of the magnet in ideal parameters – what contributes to it?
- with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
- whose transverse dimension reaches at least 10 mm
- with an ground touching surface
- with direct contact (no paint)
- during pulling in a direction vertical to the plane
- at standard ambient temperature
Practical lifting capacity: influencing factors
- Gap (between the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
- Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate lowers the load capacity.
Safe handling of neodymium magnets
Caution required
Handle with care. Rare earth magnets attract from a long distance and snap with huge force, often quicker than you can react.
Machining danger
Dust generated during grinding of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.
Allergy Warning
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, cease working with magnets and wear gloves.
Heat warning
Keep cool. Neodymium magnets are sensitive to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).
Safe distance
Do not bring magnets close to a wallet, laptop, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.
Risk of cracking
Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.
Compass and GPS
An intense magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Do not bring magnets close to a device to avoid damaging the sensors.
Serious injuries
Large magnets can crush fingers instantly. Under no circumstances put your hand betwixt two strong magnets.
Keep away from children
Product intended for adults. Small elements can be swallowed, causing intestinal necrosis. Keep away from children and animals.
Medical implants
For implant holders: Powerful magnets disrupt electronics. Keep at least 30 cm distance or ask another person to handle the magnets.
