MPL 40x20x5 / N38 - lamellar magnet
lamellar magnet
Catalog no 020160
GTIN/EAN: 5906301811664
length
40 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
30 g
Magnetization Direction
↑ axial
Load capacity
10.67 kg / 104.63 N
Magnetic Induction
205.27 mT / 2053 Gs
Coating
[NiCuNi] Nickel
12.24 ZŁ with VAT / pcs + price for transport
9.95 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical of the product - MPL 40x20x5 / N38 - lamellar magnet
Specification / characteristics - MPL 40x20x5 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020160 |
| GTIN/EAN | 5906301811664 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 40 mm [±0,1 mm] |
| Width | 20 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 30 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 10.67 kg / 104.63 N |
| Magnetic Induction ~ ? | 205.27 mT / 2053 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 analysis of the magnet - data
These values constitute the outcome of a mathematical calculation. Values are based on algorithms for the class Nd2Fe14B. Operational performance may differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.
Table 1: Static pull force (force vs gap) - power drop
MPL 40x20x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
2052 Gs
205.2 mT
|
10.67 kg / 10670.0 g
104.7 N
|
crushing |
| 1 mm |
1956 Gs
195.6 mT
|
9.69 kg / 9693.2 g
95.1 N
|
strong |
| 2 mm |
1839 Gs
183.9 mT
|
8.57 kg / 8570.5 g
84.1 N
|
strong |
| 3 mm |
1711 Gs
171.1 mT
|
7.41 kg / 7413.1 g
72.7 N
|
strong |
| 5 mm |
1444 Gs
144.4 mT
|
5.28 kg / 5282.9 g
51.8 N
|
strong |
| 10 mm |
888 Gs
88.8 mT
|
2.00 kg / 1996.5 g
19.6 N
|
safe |
| 15 mm |
545 Gs
54.5 mT
|
0.75 kg / 752.0 g
7.4 N
|
safe |
| 20 mm |
346 Gs
34.6 mT
|
0.30 kg / 302.9 g
3.0 N
|
safe |
| 30 mm |
156 Gs
15.6 mT
|
0.06 kg / 61.9 g
0.6 N
|
safe |
| 50 mm |
46 Gs
4.6 mT
|
0.01 kg / 5.4 g
0.1 N
|
safe |
Table 2: Slippage load (vertical surface)
MPL 40x20x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.13 kg / 2134.0 g
20.9 N
|
| 1 mm | Stal (~0.2) |
1.94 kg / 1938.0 g
19.0 N
|
| 2 mm | Stal (~0.2) |
1.71 kg / 1714.0 g
16.8 N
|
| 3 mm | Stal (~0.2) |
1.48 kg / 1482.0 g
14.5 N
|
| 5 mm | Stal (~0.2) |
1.06 kg / 1056.0 g
10.4 N
|
| 10 mm | Stal (~0.2) |
0.40 kg / 400.0 g
3.9 N
|
| 15 mm | Stal (~0.2) |
0.15 kg / 150.0 g
1.5 N
|
| 20 mm | Stal (~0.2) |
0.06 kg / 60.0 g
0.6 N
|
| 30 mm | Stal (~0.2) |
0.01 kg / 12.0 g
0.1 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MPL 40x20x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
3.20 kg / 3201.0 g
31.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.13 kg / 2134.0 g
20.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.07 kg / 1067.0 g
10.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
5.34 kg / 5335.0 g
52.3 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 40x20x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.53 kg / 533.5 g
5.2 N
|
| 1 mm |
|
1.33 kg / 1333.8 g
13.1 N
|
| 2 mm |
|
2.67 kg / 2667.5 g
26.2 N
|
| 5 mm |
|
6.67 kg / 6668.8 g
65.4 N
|
| 10 mm |
|
10.67 kg / 10670.0 g
104.7 N
|
Table 5: Thermal resistance (material behavior) - thermal limit
MPL 40x20x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
10.67 kg / 10670.0 g
104.7 N
|
OK |
| 40 °C | -2.2% |
10.44 kg / 10435.3 g
102.4 N
|
OK |
| 60 °C | -4.4% |
10.20 kg / 10200.5 g
100.1 N
|
|
| 80 °C | -6.6% |
9.97 kg / 9965.8 g
97.8 N
|
|
| 100 °C | -28.8% |
7.60 kg / 7597.0 g
74.5 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 40x20x5 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
20.78 kg / 20775 g
203.8 N
3 495 Gs
|
N/A |
| 1 mm |
19.88 kg / 19880 g
195.0 N
4 015 Gs
|
17.89 kg / 17892 g
175.5 N
~0 Gs
|
| 2 mm |
18.87 kg / 18873 g
185.1 N
3 912 Gs
|
16.99 kg / 16986 g
166.6 N
~0 Gs
|
| 3 mm |
17.80 kg / 17800 g
174.6 N
3 800 Gs
|
16.02 kg / 16020 g
157.2 N
~0 Gs
|
| 5 mm |
15.56 kg / 15558 g
152.6 N
3 552 Gs
|
14.00 kg / 14002 g
137.4 N
~0 Gs
|
| 10 mm |
10.29 kg / 10286 g
100.9 N
2 888 Gs
|
9.26 kg / 9257 g
90.8 N
~0 Gs
|
| 20 mm |
3.89 kg / 3887 g
38.1 N
1 776 Gs
|
3.50 kg / 3499 g
34.3 N
~0 Gs
|
| 50 mm |
0.26 kg / 257 g
2.5 N
456 Gs
|
0.23 kg / 231 g
2.3 N
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MPL 40x20x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 11.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 9.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 7.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 5.5 cm |
| Car key | 50 Gs (5.0 mT) | 5.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Impact energy (cracking risk) - collision effects
MPL 40x20x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
21.13 km/h
(5.87 m/s)
|
0.52 J | |
| 30 mm |
33.06 km/h
(9.18 m/s)
|
1.27 J | |
| 50 mm |
42.54 km/h
(11.82 m/s)
|
2.09 J | |
| 100 mm |
60.15 km/h
(16.71 m/s)
|
4.19 J |
Table 9: Surface protection spec
MPL 40x20x5 / 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 (Pc)
MPL 40x20x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 18 042 Mx | 180.4 µWb |
| Pc Coefficient | 0.23 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MPL 40x20x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 10.67 kg | Standard |
| Water (riverbed) |
12.22 kg
(+1.55 kg Buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical wall, the magnet holds merely a fraction of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) significantly limits the holding force.
3. Heat tolerance
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.23
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 |
See also deals
Pros and cons of rare earth magnets.
Advantages
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
- They are resistant to demagnetization induced by external disturbances,
- Thanks to the metallic finish, the coating of Ni-Cu-Ni, gold, or silver gives an professional appearance,
- They are known for high magnetic induction at the operating surface, which improves attraction properties,
- Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of individual creating and modifying to precise conditions,
- Significant place in innovative solutions – they are used in hard drives, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
- At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets lose their force 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 durability even at temperatures up to 230°C
- They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- We recommend casing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated forms.
- Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these devices 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
Pull force analysis
Maximum lifting capacity of the magnet – what contributes to it?
- on a block made of structural steel, optimally conducting the magnetic flux
- whose thickness is min. 10 mm
- with an ground touching surface
- with total lack of distance (without impurities)
- under perpendicular application of breakaway force (90-degree angle)
- in stable room temperature
Practical aspects of lifting capacity – factors
- Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
- Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
- Steel thickness – too thin plate does not close the flux, causing part of the power to be lost to the other side.
- Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
- Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate reduces the load capacity.
Safety rules for work with NdFeB magnets
Material brittleness
Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Impact on smartphones
A strong magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.
Product not for children
These products are not intended for children. Eating several magnets can lead to them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.
Pinching danger
Watch your fingers. Two large magnets will join immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!
Danger to pacemakers
People with a ICD must maintain an absolute distance from magnets. The magnetism can stop the operation of the implant.
Allergy Warning
Medical facts indicate that nickel (standard magnet coating) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands or select encased magnets.
Handling rules
Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.
Data carriers
Equipment safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).
Fire warning
Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this may cause fire.
Maximum temperature
Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.
