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 details - 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 |
Physical analysis of the magnet - report
Presented data represent the outcome of a physical analysis. Values rely on algorithms for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these data as a preliminary roadmap during assembly planning.
Table 1: Static force (pull vs gap) - interaction chart
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 pounds
70100.0 g / 687.7 N
|
crushing |
| 1 mm |
3740 Gs
374.0 mT
|
65.41 kg / 144.20 pounds
65408.0 g / 641.7 N
|
crushing |
| 2 mm |
3601 Gs
360.1 mT
|
60.65 kg / 133.72 pounds
60652.7 g / 595.0 N
|
crushing |
| 3 mm |
3459 Gs
345.9 mT
|
55.95 kg / 123.35 pounds
55950.5 g / 548.9 N
|
crushing |
| 5 mm |
3168 Gs
316.8 mT
|
46.94 kg / 103.47 pounds
46935.3 g / 460.4 N
|
crushing |
| 10 mm |
2460 Gs
246.0 mT
|
28.31 kg / 62.40 pounds
28306.3 g / 277.7 N
|
crushing |
| 15 mm |
1855 Gs
185.5 mT
|
16.10 kg / 35.48 pounds
16095.6 g / 157.9 N
|
crushing |
| 20 mm |
1384 Gs
138.4 mT
|
8.96 kg / 19.76 pounds
8963.2 g / 87.9 N
|
strong |
| 30 mm |
782 Gs
78.2 mT
|
2.86 kg / 6.31 pounds
2863.1 g / 28.1 N
|
strong |
| 50 mm |
293 Gs
29.3 mT
|
0.40 kg / 0.89 pounds
402.4 g / 3.9 N
|
safe |
Table 2: Slippage load (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 pounds
14020.0 g / 137.5 N
|
| 1 mm | Stal (~0.2) |
13.08 kg / 28.84 pounds
13082.0 g / 128.3 N
|
| 2 mm | Stal (~0.2) |
12.13 kg / 26.74 pounds
12130.0 g / 119.0 N
|
| 3 mm | Stal (~0.2) |
11.19 kg / 24.67 pounds
11190.0 g / 109.8 N
|
| 5 mm | Stal (~0.2) |
9.39 kg / 20.70 pounds
9388.0 g / 92.1 N
|
| 10 mm | Stal (~0.2) |
5.66 kg / 12.48 pounds
5662.0 g / 55.5 N
|
| 15 mm | Stal (~0.2) |
3.22 kg / 7.10 pounds
3220.0 g / 31.6 N
|
| 20 mm | Stal (~0.2) |
1.79 kg / 3.95 pounds
1792.0 g / 17.6 N
|
| 30 mm | Stal (~0.2) |
0.57 kg / 1.26 pounds
572.0 g / 5.6 N
|
| 50 mm | Stal (~0.2) |
0.08 kg / 0.18 pounds
80.0 g / 0.8 N
|
Table 3: Vertical assembly (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 pounds
21030.0 g / 206.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
14.02 kg / 30.91 pounds
14020.0 g / 137.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
7.01 kg / 15.45 pounds
7010.0 g / 68.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
35.05 kg / 77.27 pounds
35050.0 g / 343.8 N
|
Table 4: Material efficiency (saturation) - 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 pounds
2336.7 g / 22.9 N
|
| 1 mm |
|
5.84 kg / 12.88 pounds
5841.7 g / 57.3 N
|
| 2 mm |
|
11.68 kg / 25.76 pounds
11683.3 g / 114.6 N
|
| 3 mm |
|
17.53 kg / 38.64 pounds
17525.0 g / 171.9 N
|
| 5 mm |
|
29.21 kg / 64.39 pounds
29208.3 g / 286.5 N
|
| 10 mm |
|
58.42 kg / 128.79 pounds
58416.7 g / 573.1 N
|
| 11 mm |
|
64.26 kg / 141.67 pounds
64258.3 g / 630.4 N
|
| 12 mm |
|
70.10 kg / 154.54 pounds
70100.0 g / 687.7 N
|
Table 5: Thermal stability (material behavior) - thermal limit
MW 50x20 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
70.10 kg / 154.54 pounds
70100.0 g / 687.7 N
|
OK |
| 40 °C | -2.2% |
68.56 kg / 151.14 pounds
68557.8 g / 672.6 N
|
OK |
| 60 °C | -4.4% |
67.02 kg / 147.74 pounds
67015.6 g / 657.4 N
|
|
| 80 °C | -6.6% |
65.47 kg / 144.34 pounds
65473.4 g / 642.3 N
|
|
| 100 °C | -28.8% |
49.91 kg / 110.04 pounds
49911.2 g / 489.6 N
|
Table 6: Two magnets (attraction) - field range
MW 50x20 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
181.46 kg / 400.06 pounds
5 255 Gs
|
27.22 kg / 60.01 pounds
27220 g / 267.0 N
|
N/A |
| 1 mm |
175.47 kg / 386.84 pounds
7 615 Gs
|
26.32 kg / 58.03 pounds
26321 g / 258.2 N
|
157.92 kg / 348.16 pounds
~0 Gs
|
| 2 mm |
169.32 kg / 373.28 pounds
7 480 Gs
|
25.40 kg / 55.99 pounds
25398 g / 249.2 N
|
152.39 kg / 335.96 pounds
~0 Gs
|
| 3 mm |
163.16 kg / 359.70 pounds
7 343 Gs
|
24.47 kg / 53.96 pounds
24474 g / 240.1 N
|
146.84 kg / 323.73 pounds
~0 Gs
|
| 5 mm |
150.90 kg / 332.67 pounds
7 061 Gs
|
22.63 kg / 49.90 pounds
22634 g / 222.0 N
|
135.81 kg / 299.40 pounds
~0 Gs
|
| 10 mm |
121.50 kg / 267.86 pounds
6 336 Gs
|
18.22 kg / 40.18 pounds
18225 g / 178.8 N
|
109.35 kg / 241.07 pounds
~0 Gs
|
| 20 mm |
73.28 kg / 161.54 pounds
4 921 Gs
|
10.99 kg / 24.23 pounds
10991 g / 107.8 N
|
65.95 kg / 145.39 pounds
~0 Gs
|
| 50 mm |
12.99 kg / 28.63 pounds
2 071 Gs
|
1.95 kg / 4.29 pounds
1948 g / 19.1 N
|
11.69 kg / 25.76 pounds
~0 Gs
|
| 60 mm |
7.41 kg / 16.34 pounds
1 565 Gs
|
1.11 kg / 2.45 pounds
1112 g / 10.9 N
|
6.67 kg / 14.71 pounds
~0 Gs
|
| 70 mm |
4.35 kg / 9.58 pounds
1 198 Gs
|
0.65 kg / 1.44 pounds
652 g / 6.4 N
|
3.91 kg / 8.62 pounds
~0 Gs
|
| 80 mm |
2.62 kg / 5.78 pounds
931 Gs
|
0.39 kg / 0.87 pounds
393 g / 3.9 N
|
2.36 kg / 5.20 pounds
~0 Gs
|
| 90 mm |
1.63 kg / 3.59 pounds
734 Gs
|
0.24 kg / 0.54 pounds
245 g / 2.4 N
|
1.47 kg / 3.23 pounds
~0 Gs
|
| 100 mm |
1.04 kg / 2.30 pounds
587 Gs
|
0.16 kg / 0.34 pounds
156 g / 1.5 N
|
0.94 kg / 2.07 pounds
~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 |
| Mobile device | 40 Gs (4.0 mT) | 11.5 cm |
| Remote | 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 (cracking risk) - 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: Anti-corrosion coating 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 (Flux)
MW 50x20 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 78 540 Mx | 785.4 µWb |
| Pc Coefficient | 0.50 | Low (Flat) |
Table 11: Submerged application
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. Shear force
*Caution: On a vertical surface, the magnet retains merely ~20% of its max power.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Temperature resistance
*For N38 grade, 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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See also offers
Strengths and weaknesses of Nd2Fe14B magnets.
Advantages
- They retain full power for almost 10 years – the loss is just ~1% (based on simulations),
- They maintain their magnetic properties even under strong external field,
- By applying a smooth layer of silver, the element gains an proper look,
- They are known for high magnetic induction at the operating surface, making them more effective,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
- Thanks to freedom in constructing and the ability to modify to individual projects,
- Key role in advanced technology sectors – they find application in HDD drives, electric motors, diagnostic systems, and other advanced devices.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Due to limitations in creating threads and complicated forms in magnets, we recommend using a housing - magnetic holder.
- Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these devices can complicate diagnosis 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
Maximum lifting capacity of the magnet – what it depends on?
- with the application of a yoke made of special test steel, ensuring full magnetic saturation
- with a thickness no less than 10 mm
- with a plane free of scratches
- under conditions of ideal adhesion (surface-to-surface)
- under perpendicular force vector (90-degree angle)
- at standard ambient temperature
Impact of factors on magnetic holding capacity in practice
- Gap (betwixt the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
- 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.
- Base massiveness – too thin steel causes magnetic saturation, causing part of the flux to be escaped to the other side.
- Steel grade – the best choice is high-permeability steel. Hardened steels may attract less.
- Plate texture – ground elements guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
- Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).
Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate lowers the holding force.
Safe handling of neodymium magnets
Thermal limits
Keep cool. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).
Crushing force
Watch your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!
Machining danger
Fire hazard: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.
Sensitization to coating
It is widely known that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact and select encased magnets.
Safe distance
Do not bring magnets near a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Magnet fragility
Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.
Handling guide
Handle with care. Rare earth magnets attract from a long distance and connect with massive power, often faster than you can move away.
Keep away from electronics
Be aware: rare earth magnets generate a field that confuses sensitive sensors. Maintain a separation from your phone, device, and GPS.
Medical interference
People with a ICD have to maintain an absolute distance from magnets. The magnetism can stop the functioning of the implant.
Product not for children
Always store magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are life-threatening.
