MW 50x20 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010080
GTIN/EAN: 5906301810797
Diameter Ø
50 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
294.52 g
Magnetization Direction
↑ axial
Load capacity
70.10 kg / 687.66 N
Magnetic Induction
387.23 mT / 3872 Gs
Coating
[NiCuNi] Nickel
106.96 ZŁ with VAT / pcs + price for transport
86.96 ZŁ net + 23% VAT / pcs
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Technical parameters - MW 50x20 / N38 - cylindrical magnet
Specification / characteristics - MW 50x20 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010080 |
| GTIN/EAN | 5906301810797 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 50 mm [±0,1 mm] |
| Height | 20 mm [±0,1 mm] |
| Weight | 294.52 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 70.10 kg / 687.66 N |
| Magnetic Induction ~ ? | 387.23 mT / 3872 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 - technical parameters
These values represent the outcome of a mathematical calculation. Results rely on algorithms for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Please consider these calculations as a reference point during assembly planning.
Table 1: Static pull force (force vs gap) - characteristics
MW 50x20 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3872 Gs
387.2 mT
|
70.10 kg / 154.54 LBS
70100.0 g / 687.7 N
|
crushing |
| 1 mm |
3740 Gs
374.0 mT
|
65.41 kg / 144.20 LBS
65408.0 g / 641.7 N
|
crushing |
| 2 mm |
3601 Gs
360.1 mT
|
60.65 kg / 133.72 LBS
60652.7 g / 595.0 N
|
crushing |
| 3 mm |
3459 Gs
345.9 mT
|
55.95 kg / 123.35 LBS
55950.5 g / 548.9 N
|
crushing |
| 5 mm |
3168 Gs
316.8 mT
|
46.94 kg / 103.47 LBS
46935.3 g / 460.4 N
|
crushing |
| 10 mm |
2460 Gs
246.0 mT
|
28.31 kg / 62.40 LBS
28306.3 g / 277.7 N
|
crushing |
| 15 mm |
1855 Gs
185.5 mT
|
16.10 kg / 35.48 LBS
16095.6 g / 157.9 N
|
crushing |
| 20 mm |
1384 Gs
138.4 mT
|
8.96 kg / 19.76 LBS
8963.2 g / 87.9 N
|
medium risk |
| 30 mm |
782 Gs
78.2 mT
|
2.86 kg / 6.31 LBS
2863.1 g / 28.1 N
|
medium risk |
| 50 mm |
293 Gs
29.3 mT
|
0.40 kg / 0.89 LBS
402.4 g / 3.9 N
|
weak grip |
Table 2: Sliding capacity (vertical surface)
MW 50x20 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
14.02 kg / 30.91 LBS
14020.0 g / 137.5 N
|
| 1 mm | Stal (~0.2) |
13.08 kg / 28.84 LBS
13082.0 g / 128.3 N
|
| 2 mm | Stal (~0.2) |
12.13 kg / 26.74 LBS
12130.0 g / 119.0 N
|
| 3 mm | Stal (~0.2) |
11.19 kg / 24.67 LBS
11190.0 g / 109.8 N
|
| 5 mm | Stal (~0.2) |
9.39 kg / 20.70 LBS
9388.0 g / 92.1 N
|
| 10 mm | Stal (~0.2) |
5.66 kg / 12.48 LBS
5662.0 g / 55.5 N
|
| 15 mm | Stal (~0.2) |
3.22 kg / 7.10 LBS
3220.0 g / 31.6 N
|
| 20 mm | Stal (~0.2) |
1.79 kg / 3.95 LBS
1792.0 g / 17.6 N
|
| 30 mm | Stal (~0.2) |
0.57 kg / 1.26 LBS
572.0 g / 5.6 N
|
| 50 mm | Stal (~0.2) |
0.08 kg / 0.18 LBS
80.0 g / 0.8 N
|
Table 3: Wall mounting (shearing) - vertical pull
MW 50x20 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
21.03 kg / 46.36 LBS
21030.0 g / 206.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
14.02 kg / 30.91 LBS
14020.0 g / 137.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
7.01 kg / 15.45 LBS
7010.0 g / 68.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
35.05 kg / 77.27 LBS
35050.0 g / 343.8 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 50x20 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.34 kg / 5.15 LBS
2336.7 g / 22.9 N
|
| 1 mm |
|
5.84 kg / 12.88 LBS
5841.7 g / 57.3 N
|
| 2 mm |
|
11.68 kg / 25.76 LBS
11683.3 g / 114.6 N
|
| 3 mm |
|
17.53 kg / 38.64 LBS
17525.0 g / 171.9 N
|
| 5 mm |
|
29.21 kg / 64.39 LBS
29208.3 g / 286.5 N
|
| 10 mm |
|
58.42 kg / 128.79 LBS
58416.7 g / 573.1 N
|
| 11 mm |
|
64.26 kg / 141.67 LBS
64258.3 g / 630.4 N
|
| 12 mm |
|
70.10 kg / 154.54 LBS
70100.0 g / 687.7 N
|
Table 5: Thermal stability (stability) - power drop
MW 50x20 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
70.10 kg / 154.54 LBS
70100.0 g / 687.7 N
|
OK |
| 40 °C | -2.2% |
68.56 kg / 151.14 LBS
68557.8 g / 672.6 N
|
OK |
| 60 °C | -4.4% |
67.02 kg / 147.74 LBS
67015.6 g / 657.4 N
|
|
| 80 °C | -6.6% |
65.47 kg / 144.34 LBS
65473.4 g / 642.3 N
|
|
| 100 °C | -28.8% |
49.91 kg / 110.04 LBS
49911.2 g / 489.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 50x20 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
181.46 kg / 400.06 LBS
5 255 Gs
|
27.22 kg / 60.01 LBS
27220 g / 267.0 N
|
N/A |
| 1 mm |
175.47 kg / 386.84 LBS
7 615 Gs
|
26.32 kg / 58.03 LBS
26321 g / 258.2 N
|
157.92 kg / 348.16 LBS
~0 Gs
|
| 2 mm |
169.32 kg / 373.28 LBS
7 480 Gs
|
25.40 kg / 55.99 LBS
25398 g / 249.2 N
|
152.39 kg / 335.96 LBS
~0 Gs
|
| 3 mm |
163.16 kg / 359.70 LBS
7 343 Gs
|
24.47 kg / 53.96 LBS
24474 g / 240.1 N
|
146.84 kg / 323.73 LBS
~0 Gs
|
| 5 mm |
150.90 kg / 332.67 LBS
7 061 Gs
|
22.63 kg / 49.90 LBS
22634 g / 222.0 N
|
135.81 kg / 299.40 LBS
~0 Gs
|
| 10 mm |
121.50 kg / 267.86 LBS
6 336 Gs
|
18.22 kg / 40.18 LBS
18225 g / 178.8 N
|
109.35 kg / 241.07 LBS
~0 Gs
|
| 20 mm |
73.28 kg / 161.54 LBS
4 921 Gs
|
10.99 kg / 24.23 LBS
10991 g / 107.8 N
|
65.95 kg / 145.39 LBS
~0 Gs
|
| 50 mm |
12.99 kg / 28.63 LBS
2 071 Gs
|
1.95 kg / 4.29 LBS
1948 g / 19.1 N
|
11.69 kg / 25.76 LBS
~0 Gs
|
| 60 mm |
7.41 kg / 16.34 LBS
1 565 Gs
|
1.11 kg / 2.45 LBS
1112 g / 10.9 N
|
6.67 kg / 14.71 LBS
~0 Gs
|
| 70 mm |
4.35 kg / 9.58 LBS
1 198 Gs
|
0.65 kg / 1.44 LBS
652 g / 6.4 N
|
3.91 kg / 8.62 LBS
~0 Gs
|
| 80 mm |
2.62 kg / 5.78 LBS
931 Gs
|
0.39 kg / 0.87 LBS
393 g / 3.9 N
|
2.36 kg / 5.20 LBS
~0 Gs
|
| 90 mm |
1.63 kg / 3.59 LBS
734 Gs
|
0.24 kg / 0.54 LBS
245 g / 2.4 N
|
1.47 kg / 3.23 LBS
~0 Gs
|
| 100 mm |
1.04 kg / 2.30 LBS
587 Gs
|
0.16 kg / 0.34 LBS
156 g / 1.5 N
|
0.94 kg / 2.07 LBS
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MW 50x20 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 24.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 19.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 15.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 11.5 cm |
| Car key | 50 Gs (5.0 mT) | 10.5 cm |
| Payment card | 400 Gs (40.0 mT) | 4.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.5 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MW 50x20 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
19.09 km/h
(5.30 m/s)
|
4.14 J | |
| 30 mm |
27.63 km/h
(7.67 m/s)
|
8.67 J | |
| 50 mm |
34.92 km/h
(9.70 m/s)
|
13.85 J | |
| 100 mm |
49.21 km/h
(13.67 m/s)
|
27.51 J |
Table 9: Coating parameters (durability)
MW 50x20 / 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)
MW 50x20 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 78 540 Mx | 785.4 µWb |
| Pc Coefficient | 0.50 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MW 50x20 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 70.10 kg | Standard |
| Water (riverbed) |
80.26 kg
(+10.16 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. computer case) significantly limits the holding force.
3. Heat tolerance
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.50
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Strengths as well as weaknesses of neodymium magnets.
Strengths
- They retain attractive force for almost ten years – the loss is just ~1% (according to analyses),
- Magnets very well defend themselves against loss of magnetization caused by ambient magnetic noise,
- Thanks to the smooth finish, the layer of nickel, gold-plated, or silver gives an aesthetic appearance,
- The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
- Possibility of detailed shaping and optimizing to atypical needs,
- Wide application in innovative solutions – they are commonly used in HDD drives, motor assemblies, advanced medical instruments, also other advanced devices.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Disadvantages
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
- Neodymium magnets lose their power 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
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We recommend cover - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated shapes.
- Health risk resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
- Due to complex production process, their price is relatively high,
Pull force analysis
Maximum magnetic pulling force – what it depends on?
- with the use of a sheet made of low-carbon steel, guaranteeing maximum field concentration
- possessing a massiveness of min. 10 mm to avoid saturation
- with an ideally smooth contact surface
- under conditions of no distance (surface-to-surface)
- during detachment in a direction perpendicular to the mounting surface
- in neutral thermal conditions
Lifting capacity in practice – influencing factors
- Gap (betwixt the magnet and the plate), because even a very small distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
- Steel grade – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
- Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
- Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.
Warnings
Mechanical processing
Fire warning: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.
Demagnetization risk
Control the heat. Heating the magnet to high heat will ruin its properties and strength.
Medical interference
For implant holders: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or ask another person to work with the magnets.
Do not underestimate power
Handle magnets with awareness. Their immense force can shock even experienced users. Stay alert and respect their power.
Impact on smartphones
GPS units and smartphones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.
Allergic reactions
Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, cease handling magnets and use protective gear.
Product not for children
Strictly keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are very dangerous.
Data carriers
Data protection: Strong magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).
Beware of splinters
NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets leads to them cracking into small pieces.
Bone fractures
Risk of injury: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.
