MPL 50x20x5 / N38 - lamellar magnet
lamellar magnet
Catalog no 020473
GTIN/EAN: 5906301811930
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
37.5 g
Magnetization Direction
↑ axial
Load capacity
12.69 kg / 124.48 N
Magnetic Induction
197.73 mT / 1977 Gs
Coating
[NiCuNi] Nickel
14.56 ZŁ with VAT / pcs + price for transport
11.84 ZŁ net + 23% VAT / pcs
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Detailed specification - MPL 50x20x5 / N38 - lamellar magnet
Specification / characteristics - MPL 50x20x5 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020473 |
| GTIN/EAN | 5906301811930 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 50 mm [±0,1 mm] |
| Width | 20 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 37.5 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 12.69 kg / 124.48 N |
| Magnetic Induction ~ ? | 197.73 mT / 1977 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 assembly - technical parameters
Presented information constitute the direct effect of a engineering analysis. Results were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ. Use these calculations as a reference point during assembly planning.
Table 1: Static force (pull vs gap) - characteristics
MPL 50x20x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1977 Gs
197.7 mT
|
12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
|
crushing |
| 1 mm |
1885 Gs
188.5 mT
|
11.53 kg / 25.42 LBS
11530.3 g / 113.1 N
|
crushing |
| 2 mm |
1772 Gs
177.2 mT
|
10.20 kg / 22.49 LBS
10199.9 g / 100.1 N
|
crushing |
| 3 mm |
1649 Gs
164.9 mT
|
8.83 kg / 19.47 LBS
8831.3 g / 86.6 N
|
warning |
| 5 mm |
1395 Gs
139.5 mT
|
6.32 kg / 13.93 LBS
6320.3 g / 62.0 N
|
warning |
| 10 mm |
870 Gs
87.0 mT
|
2.46 kg / 5.42 LBS
2459.4 g / 24.1 N
|
warning |
| 15 mm |
549 Gs
54.9 mT
|
0.98 kg / 2.15 LBS
976.9 g / 9.6 N
|
safe |
| 20 mm |
359 Gs
35.9 mT
|
0.42 kg / 0.92 LBS
418.9 g / 4.1 N
|
safe |
| 30 mm |
172 Gs
17.2 mT
|
0.10 kg / 0.21 LBS
95.7 g / 0.9 N
|
safe |
| 50 mm |
54 Gs
5.4 mT
|
0.01 kg / 0.02 LBS
9.5 g / 0.1 N
|
safe |
Table 2: Vertical load (vertical surface)
MPL 50x20x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.54 kg / 5.60 LBS
2538.0 g / 24.9 N
|
| 1 mm | Stal (~0.2) |
2.31 kg / 5.08 LBS
2306.0 g / 22.6 N
|
| 2 mm | Stal (~0.2) |
2.04 kg / 4.50 LBS
2040.0 g / 20.0 N
|
| 3 mm | Stal (~0.2) |
1.77 kg / 3.89 LBS
1766.0 g / 17.3 N
|
| 5 mm | Stal (~0.2) |
1.26 kg / 2.79 LBS
1264.0 g / 12.4 N
|
| 10 mm | Stal (~0.2) |
0.49 kg / 1.08 LBS
492.0 g / 4.8 N
|
| 15 mm | Stal (~0.2) |
0.20 kg / 0.43 LBS
196.0 g / 1.9 N
|
| 20 mm | Stal (~0.2) |
0.08 kg / 0.19 LBS
84.0 g / 0.8 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
20.0 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 (shearing) - behavior on slippery surfaces
MPL 50x20x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
3.81 kg / 8.39 LBS
3807.0 g / 37.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.54 kg / 5.60 LBS
2538.0 g / 24.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.27 kg / 2.80 LBS
1269.0 g / 12.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
6.35 kg / 13.99 LBS
6345.0 g / 62.2 N
|
Table 4: Steel thickness (substrate influence) - power losses
MPL 50x20x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.63 kg / 1.40 LBS
634.5 g / 6.2 N
|
| 1 mm |
|
1.59 kg / 3.50 LBS
1586.3 g / 15.6 N
|
| 2 mm |
|
3.17 kg / 6.99 LBS
3172.5 g / 31.1 N
|
| 3 mm |
|
4.76 kg / 10.49 LBS
4758.8 g / 46.7 N
|
| 5 mm |
|
7.93 kg / 17.49 LBS
7931.2 g / 77.8 N
|
| 10 mm |
|
12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
|
| 11 mm |
|
12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
|
| 12 mm |
|
12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
|
Table 5: Thermal stability (stability) - resistance threshold
MPL 50x20x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
|
OK |
| 40 °C | -2.2% |
12.41 kg / 27.36 LBS
12410.8 g / 121.8 N
|
OK |
| 60 °C | -4.4% |
12.13 kg / 26.75 LBS
12131.6 g / 119.0 N
|
|
| 80 °C | -6.6% |
11.85 kg / 26.13 LBS
11852.5 g / 116.3 N
|
|
| 100 °C | -28.8% |
9.04 kg / 19.92 LBS
9035.3 g / 88.6 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 50x20x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
24.10 kg / 53.12 LBS
3 371 Gs
|
3.61 kg / 7.97 LBS
3614 g / 35.5 N
|
N/A |
| 1 mm |
23.06 kg / 50.84 LBS
3 868 Gs
|
3.46 kg / 7.63 LBS
3459 g / 33.9 N
|
20.75 kg / 45.75 LBS
~0 Gs
|
| 2 mm |
21.89 kg / 48.27 LBS
3 769 Gs
|
3.28 kg / 7.24 LBS
3284 g / 32.2 N
|
19.71 kg / 43.44 LBS
~0 Gs
|
| 3 mm |
20.65 kg / 45.53 LBS
3 661 Gs
|
3.10 kg / 6.83 LBS
3098 g / 30.4 N
|
18.59 kg / 40.98 LBS
~0 Gs
|
| 5 mm |
18.07 kg / 39.83 LBS
3 424 Gs
|
2.71 kg / 5.97 LBS
2710 g / 26.6 N
|
16.26 kg / 35.84 LBS
~0 Gs
|
| 10 mm |
12.00 kg / 26.46 LBS
2 790 Gs
|
1.80 kg / 3.97 LBS
1800 g / 17.7 N
|
10.80 kg / 23.81 LBS
~0 Gs
|
| 20 mm |
4.67 kg / 10.30 LBS
1 741 Gs
|
0.70 kg / 1.54 LBS
701 g / 6.9 N
|
4.20 kg / 9.27 LBS
~0 Gs
|
| 50 mm |
0.37 kg / 0.81 LBS
488 Gs
|
0.06 kg / 0.12 LBS
55 g / 0.5 N
|
0.33 kg / 0.73 LBS
~0 Gs
|
| 60 mm |
0.18 kg / 0.40 LBS
343 Gs
|
0.03 kg / 0.06 LBS
27 g / 0.3 N
|
0.16 kg / 0.36 LBS
~0 Gs
|
| 70 mm |
0.10 kg / 0.21 LBS
248 Gs
|
0.01 kg / 0.03 LBS
14 g / 0.1 N
|
0.09 kg / 0.19 LBS
~0 Gs
|
| 80 mm |
0.05 kg / 0.12 LBS
184 Gs
|
0.01 kg / 0.02 LBS
8 g / 0.1 N
|
0.05 kg / 0.10 LBS
~0 Gs
|
| 90 mm |
0.03 kg / 0.07 LBS
140 Gs
|
0.00 kg / 0.01 LBS
5 g / 0.0 N
|
0.03 kg / 0.06 LBS
~0 Gs
|
| 100 mm |
0.02 kg / 0.04 LBS
108 Gs
|
0.00 kg / 0.01 LBS
3 g / 0.0 N
|
0.02 kg / 0.04 LBS
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MPL 50x20x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 12.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 9.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 7.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 6.0 cm |
| Remote | 50 Gs (5.0 mT) | 5.5 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 50x20x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.68 km/h
(5.74 m/s)
|
0.62 J | |
| 30 mm |
32.28 km/h
(8.97 m/s)
|
1.51 J | |
| 50 mm |
41.50 km/h
(11.53 m/s)
|
2.49 J | |
| 100 mm |
58.67 km/h
(16.30 m/s)
|
4.98 J |
Table 9: Corrosion resistance
MPL 50x20x5 / 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 50x20x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 20 792 Mx | 207.9 µWb |
| Pc Coefficient | 0.21 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MPL 50x20x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 12.69 kg | Standard |
| Water (riverbed) |
14.53 kg
(+1.84 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical wall, the magnet holds merely ~20% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. computer case) significantly reduces 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) = 0.21
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View also products
Advantages as well as disadvantages of Nd2Fe14B magnets.
Pros
- Their magnetic field is durable, and after around 10 years it decreases only by ~1% (according to research),
- They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
- In other words, due to the shiny layer of gold, the element becomes visually attractive,
- Magnets have exceptionally strong magnetic induction on the surface,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
- Considering the possibility of flexible molding and customization to custom solutions, magnetic components can be created in a broad palette of geometric configurations, which amplifies use scope,
- Wide application in innovative solutions – they are utilized in mass storage devices, motor assemblies, medical equipment, and modern systems.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Disadvantages
- At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 extremely resistant to heat
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- Limited ability of producing threads in the magnet and complicated forms - preferred is a housing - mounting mechanism.
- Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small components of these products can disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Best holding force of the magnet in ideal parameters – what contributes to it?
- on a block made of mild steel, effectively closing the magnetic field
- possessing a massiveness of at least 10 mm to avoid saturation
- with an ground contact surface
- under conditions of gap-free contact (metal-to-metal)
- for force acting at a right angle (in the magnet axis)
- at room temperature
Determinants of practical lifting force of a magnet
- Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Plate thickness – too thin sheet does not close the flux, causing part of the flux to be wasted into the air.
- Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
- Surface finish – full contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
- Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.
Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.
Safe handling of neodymium magnets
Allergy Warning
Studies show that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands and opt for coated magnets.
Combustion hazard
Dust generated during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.
Crushing risk
Danger of trauma: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.
Medical interference
People with a ICD must maintain an large gap from magnets. The magnetism can stop the operation of the implant.
Phone sensors
A powerful magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Maintain magnets near a device to prevent damaging the sensors.
No play value
Always keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are very dangerous.
Electronic hazard
Device Safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).
Maximum temperature
Keep cool. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).
Risk of cracking
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Handling rules
Handle with care. Rare earth magnets act from a distance and snap with huge force, often quicker than you can react.
