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 of the product - 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 data represent the outcome of a mathematical calculation. Results rely on models for the material Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.
Table 1: Static pull 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 lbs
70100.0 g / 687.7 N
|
dangerous! |
| 1 mm |
3740 Gs
374.0 mT
|
65.41 kg / 144.20 lbs
65408.0 g / 641.7 N
|
dangerous! |
| 2 mm |
3601 Gs
360.1 mT
|
60.65 kg / 133.72 lbs
60652.7 g / 595.0 N
|
dangerous! |
| 3 mm |
3459 Gs
345.9 mT
|
55.95 kg / 123.35 lbs
55950.5 g / 548.9 N
|
dangerous! |
| 5 mm |
3168 Gs
316.8 mT
|
46.94 kg / 103.47 lbs
46935.3 g / 460.4 N
|
dangerous! |
| 10 mm |
2460 Gs
246.0 mT
|
28.31 kg / 62.40 lbs
28306.3 g / 277.7 N
|
dangerous! |
| 15 mm |
1855 Gs
185.5 mT
|
16.10 kg / 35.48 lbs
16095.6 g / 157.9 N
|
dangerous! |
| 20 mm |
1384 Gs
138.4 mT
|
8.96 kg / 19.76 lbs
8963.2 g / 87.9 N
|
warning |
| 30 mm |
782 Gs
78.2 mT
|
2.86 kg / 6.31 lbs
2863.1 g / 28.1 N
|
warning |
| 50 mm |
293 Gs
29.3 mT
|
0.40 kg / 0.89 lbs
402.4 g / 3.9 N
|
safe |
Table 2: Slippage hold (wall)
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: 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 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) - power losses
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: Working in heat (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 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: Two magnets (repulsion) - field range
MW 50x20 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (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: Safety (HSE) (implants) - precautionary measures
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 |
| Mechanical watch | 20 Gs (2.0 mT) | 15.0 cm |
| Mobile device | 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: Dynamics (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: Surface protection spec
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: Electrical 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: 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. Wall mount (shear)
*Note: On a vertical wall, the magnet retains only approx. 20-30% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) drastically weakens the holding force.
3. Heat tolerance
*For standard magnets, the safety 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 deals
Pros as well as cons of Nd2Fe14B magnets.
Pros
- They do not lose magnetism, even over around 10 years – the decrease in power is only ~1% (theoretically),
- They are resistant to demagnetization induced by external disturbances,
- A magnet with a shiny nickel surface has better aesthetics,
- The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
- Thanks to freedom in forming and the capacity to adapt to individual projects,
- Wide application in modern technologies – they serve a role in data components, electric drive systems, advanced medical instruments, and technologically advanced constructions.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Limitations
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We recommend a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated forms.
- Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical after entering the body.
- With mass production the cost of neodymium magnets is a challenge,
Lifting parameters
Highest magnetic holding force – what it depends on?
- on a plate made of mild steel, perfectly concentrating the magnetic flux
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- characterized by smoothness
- without any clearance between the magnet and steel
- during pulling in a direction perpendicular to the plane
- at room temperature
Determinants of lifting force in real conditions
- Air gap (between the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
- Load vector – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Steel grade – ideal substrate is pure iron steel. Cast iron may attract less.
- Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
- Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).
Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.
Precautions when working with neodymium magnets
Impact on smartphones
A strong magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent breaking the sensors.
Operating temperature
Control the heat. Heating the magnet to high heat will permanently weaken its magnetic structure and strength.
Fragile material
NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets will cause them breaking into shards.
Medical interference
For implant holders: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or request help to work with the magnets.
Immense force
Be careful. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can move away.
Fire risk
Machining of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
Electronic hazard
Do not bring magnets near a wallet, laptop, or screen. The magnetic field can destroy these devices and erase data from cards.
Choking Hazard
Only for adults. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of children and animals.
Metal Allergy
Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness happens, cease handling magnets and use protective gear.
Physical harm
Pinching hazard: The pulling power is so great that it can cause blood blisters, crushing, and broken bones. Use thick gloves.
