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
bulk discounts:
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Technical specification of the product - 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 modeling of the product - data
These information constitute the direct effect of a engineering simulation. Results are based on models for the class Nd2Fe14B. Operational conditions may deviate from the simulation results. Use these data as a preliminary roadmap for designers.
Table 1: Static force (pull vs distance) - power drop
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
|
dangerous! |
| 1 mm |
1885 Gs
188.5 mT
|
11.53 kg / 25.42 LBS
11530.3 g / 113.1 N
|
dangerous! |
| 2 mm |
1772 Gs
177.2 mT
|
10.20 kg / 22.49 LBS
10199.9 g / 100.1 N
|
dangerous! |
| 3 mm |
1649 Gs
164.9 mT
|
8.83 kg / 19.47 LBS
8831.3 g / 86.6 N
|
strong |
| 5 mm |
1395 Gs
139.5 mT
|
6.32 kg / 13.93 LBS
6320.3 g / 62.0 N
|
strong |
| 10 mm |
870 Gs
87.0 mT
|
2.46 kg / 5.42 LBS
2459.4 g / 24.1 N
|
strong |
| 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: Slippage hold (wall)
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: Vertical assembly (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 (saturation) - sheet metal selection
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) - power drop
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: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 50x20x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (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 (electronics) - precautionary measures
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 |
| Mobile device | 40 Gs (4.0 mT) | 6.0 cm |
| Car key | 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: Collisions (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: Construction 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. Shear force
*Caution: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Heat tolerance
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.21
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.
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 |
Other proposals
Pros as well as cons of Nd2Fe14B magnets.
Strengths
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
- They are noted for resistance to demagnetization induced by presence of other magnetic fields,
- The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to present itself better,
- Magnetic induction on the working layer of the magnet remains very high,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- In view of the option of free shaping and adaptation to individualized requirements, neodymium magnets can be manufactured in a variety of shapes and sizes, which amplifies use scope,
- Huge importance in innovative solutions – they serve a role in magnetic memories, brushless drives, precision medical tools, also complex engineering applications.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Cons
- At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
- Due to limitations in realizing nuts and complex shapes in magnets, we recommend using casing - magnetic mechanism.
- Health risk to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small components of these magnets can be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what affects it?
- with the application of a sheet made of special test steel, ensuring maximum field concentration
- with a cross-section of at least 10 mm
- characterized by smoothness
- under conditions of gap-free contact (metal-to-metal)
- under vertical force vector (90-degree angle)
- in stable room temperature
Lifting capacity in real conditions – factors
- Gap (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
- Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
- Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
- Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
- Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate reduces the load capacity.
Safety rules for work with NdFeB magnets
ICD Warning
Individuals with a ICD must maintain an safe separation from magnets. The magnetism can disrupt the operation of the life-saving device.
Demagnetization risk
Regular neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.
Physical harm
Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!
Respect the power
Exercise caution. Neodymium magnets act from a distance and snap with huge force, often quicker than you can react.
Material brittleness
NdFeB magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets will cause them breaking into shards.
Metal Allergy
A percentage of the population experience a sensitization to nickel, which is the common plating for neodymium magnets. Frequent touching can result in an allergic reaction. We strongly advise use protective gloves.
Combustion hazard
Dust generated during grinding of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.
Keep away from electronics
An intense magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Keep magnets close to a device to avoid damaging the sensors.
Data carriers
Intense magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.
Swallowing risk
Absolutely store magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are tragic.
