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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Product card - 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 |
Technical analysis of the magnet - technical parameters
Presented values represent the result of a physical calculation. Results are based on models for the class Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.
Table 1: Static force (force vs distance) - characteristics
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 lbs
4420.0 g / 43.4 N
|
strong |
| 1 mm |
3323 Gs
332.3 mT
|
2.34 kg / 5.17 lbs
2344.7 g / 23.0 N
|
strong |
| 2 mm |
2341 Gs
234.1 mT
|
1.16 kg / 2.56 lbs
1163.0 g / 11.4 N
|
weak grip |
| 3 mm |
1678 Gs
167.8 mT
|
0.60 kg / 1.32 lbs
597.4 g / 5.9 N
|
weak grip |
| 5 mm |
944 Gs
94.4 mT
|
0.19 kg / 0.42 lbs
189.2 g / 1.9 N
|
weak grip |
| 10 mm |
320 Gs
32.0 mT
|
0.02 kg / 0.05 lbs
21.7 g / 0.2 N
|
weak grip |
| 15 mm |
141 Gs
14.1 mT
|
0.00 kg / 0.01 lbs
4.2 g / 0.0 N
|
weak grip |
| 20 mm |
73 Gs
7.3 mT
|
0.00 kg / 0.00 lbs
1.1 g / 0.0 N
|
weak grip |
| 30 mm |
26 Gs
2.6 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
weak grip |
| 50 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
Table 2: Vertical force (vertical surface)
MPL 20x5x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.88 kg / 1.95 lbs
884.0 g / 8.7 N
|
| 1 mm | Stal (~0.2) |
0.47 kg / 1.03 lbs
468.0 g / 4.6 N
|
| 2 mm | Stal (~0.2) |
0.23 kg / 0.51 lbs
232.0 g / 2.3 N
|
| 3 mm | Stal (~0.2) |
0.12 kg / 0.26 lbs
120.0 g / 1.2 N
|
| 5 mm | Stal (~0.2) |
0.04 kg / 0.08 lbs
38.0 g / 0.4 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 lbs
1326.0 g / 13.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.88 kg / 1.95 lbs
884.0 g / 8.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.44 kg / 0.97 lbs
442.0 g / 4.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.21 kg / 4.87 lbs
2210.0 g / 21.7 N
|
Table 4: Material efficiency (saturation) - power losses
MPL 20x5x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.44 kg / 0.97 lbs
442.0 g / 4.3 N
|
| 1 mm |
|
1.11 kg / 2.44 lbs
1105.0 g / 10.8 N
|
| 2 mm |
|
2.21 kg / 4.87 lbs
2210.0 g / 21.7 N
|
| 3 mm |
|
3.32 kg / 7.31 lbs
3315.0 g / 32.5 N
|
| 5 mm |
|
4.42 kg / 9.74 lbs
4420.0 g / 43.4 N
|
| 10 mm |
|
4.42 kg / 9.74 lbs
4420.0 g / 43.4 N
|
| 11 mm |
|
4.42 kg / 9.74 lbs
4420.0 g / 43.4 N
|
| 12 mm |
|
4.42 kg / 9.74 lbs
4420.0 g / 43.4 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MPL 20x5x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.42 kg / 9.74 lbs
4420.0 g / 43.4 N
|
OK |
| 40 °C | -2.2% |
4.32 kg / 9.53 lbs
4322.8 g / 42.4 N
|
OK |
| 60 °C | -4.4% |
4.23 kg / 9.32 lbs
4225.5 g / 41.5 N
|
|
| 80 °C | -6.6% |
4.13 kg / 9.10 lbs
4128.3 g / 40.5 N
|
|
| 100 °C | -28.8% |
3.15 kg / 6.94 lbs
3147.0 g / 30.9 N
|
Table 6: Two magnets (attraction) - field collision
MPL 20x5x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
12.84 kg / 28.30 lbs
5 504 Gs
|
1.93 kg / 4.24 lbs
1925 g / 18.9 N
|
N/A |
| 1 mm |
9.53 kg / 21.01 lbs
7 864 Gs
|
1.43 kg / 3.15 lbs
1430 g / 14.0 N
|
8.58 kg / 18.91 lbs
~0 Gs
|
| 2 mm |
6.81 kg / 15.01 lbs
6 647 Gs
|
1.02 kg / 2.25 lbs
1021 g / 10.0 N
|
6.13 kg / 13.51 lbs
~0 Gs
|
| 3 mm |
4.79 kg / 10.57 lbs
5 577 Gs
|
0.72 kg / 1.59 lbs
719 g / 7.1 N
|
4.31 kg / 9.51 lbs
~0 Gs
|
| 5 mm |
2.40 kg / 5.30 lbs
3 949 Gs
|
0.36 kg / 0.79 lbs
360 g / 3.5 N
|
2.16 kg / 4.77 lbs
~0 Gs
|
| 10 mm |
0.55 kg / 1.21 lbs
1 888 Gs
|
0.08 kg / 0.18 lbs
82 g / 0.8 N
|
0.49 kg / 1.09 lbs
~0 Gs
|
| 20 mm |
0.06 kg / 0.14 lbs
640 Gs
|
0.01 kg / 0.02 lbs
9 g / 0.1 N
|
0.06 kg / 0.13 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
84 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
53 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
35 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 lbs
24 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 lbs
18 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 lbs
13 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (electronics) - warnings
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 |
| Remote | 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: Impact energy (kinetic energy) - 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: Surface protection spec
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: Construction 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: Hydrostatics and buoyancy
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
*Caution: On a vertical wall, the magnet retains only approx. 20-30% of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Temperature resistance
*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) = 0.54
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View also deals
Advantages and disadvantages of neodymium magnets.
Advantages
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
- They maintain their magnetic properties even under strong external field,
- A magnet with a smooth silver surface looks better,
- Magnets are characterized by maximum magnetic induction on the active area,
- Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to versatility in constructing and the capacity to customize to unusual requirements,
- Huge importance in advanced technology sectors – they are used in HDD drives, electric motors, advanced medical instruments, also technologically advanced constructions.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Disadvantages
- At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- We suggest casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
- Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Furthermore, small components of these products can be problematic in diagnostics medical in case of swallowing.
- 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 base made of structural steel, effectively closing the magnetic flux
- possessing a massiveness of at least 10 mm to avoid saturation
- characterized by smoothness
- without the slightest insulating layer between the magnet and steel
- for force applied at a right angle (in the magnet axis)
- in temp. approx. 20°C
Practical lifting capacity: influencing factors
- Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Plate material – low-carbon steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
- Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.
Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.
Safe handling of NdFeB magnets
Health Danger
For implant holders: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.
No play value
Strictly keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are fatal.
Caution required
Handle magnets with awareness. Their immense force can shock even professionals. Stay alert and respect their force.
Electronic hazard
Data protection: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, timepieces).
Allergy Warning
Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact and opt for coated magnets.
Keep away from electronics
Note: neodymium magnets generate a field that disrupts sensitive sensors. Maintain a separation from your mobile, device, and GPS.
Fire risk
Drilling and cutting of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
Operating temperature
Watch the temperature. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.
Finger safety
Large magnets can break fingers instantly. Under no circumstances place your hand betwixt two strong magnets.
Beware of splinters
Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.
