MW 20x5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010044
GTIN: 5906301810438
Diameter Ø
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.78 g
Magnetization Direction
↑ axial
Load capacity
6.93 kg / 67.95 N
Magnetic Induction
277.16 mT / 2772 Gs
Coating
[NiCuNi] Nickel
5.56 ZŁ with VAT / pcs + price for transport
4.52 ZŁ net + 23% VAT / pcs
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MW 20x5 / N38 - cylindrical magnet
Specification / characteristics MW 20x5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010044 |
| GTIN | 5906301810438 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 20 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 11.78 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 6.93 kg / 67.95 N |
| Magnetic Induction ~ ? | 277.16 mT / 2772 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 | T |
| 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 106 | °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 simulation of the assembly - report
These information constitute the outcome of a engineering simulation. Values were calculated on algorithms for the material NdFeB. Real-world performance might slightly differ from theoretical values. Treat these data as a preliminary roadmap when designing systems.
MW 20x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
2771 Gs
277.1 mT
|
6.93 kg / 6930.0 g
68.0 N
|
medium risk |
| 1 mm |
2573 Gs
257.3 mT
|
5.97 kg / 5975.0 g
58.6 N
|
medium risk |
| 2 mm |
2340 Gs
234.0 mT
|
4.94 kg / 4940.1 g
48.5 N
|
medium risk |
| 3 mm |
2092 Gs
209.2 mT
|
3.95 kg / 3948.3 g
38.7 N
|
medium risk |
| 5 mm |
1611 Gs
161.1 mT
|
2.34 kg / 2343.4 g
23.0 N
|
medium risk |
| 10 mm |
775 Gs
77.5 mT
|
0.54 kg / 541.6 g
5.3 N
|
low risk |
| 15 mm |
387 Gs
38.7 mT
|
0.13 kg / 135.0 g
1.3 N
|
low risk |
| 20 mm |
211 Gs
21.1 mT
|
0.04 kg / 40.2 g
0.4 N
|
low risk |
| 30 mm |
80 Gs
8.0 mT
|
0.01 kg / 5.7 g
0.1 N
|
low risk |
| 50 mm |
20 Gs
2.0 mT
|
0.00 kg / 0.4 g
0.0 N
|
low risk |
MW 20x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.39 kg / 1386.0 g
13.6 N
|
| 1 mm | Stal (~0.2) |
1.19 kg / 1194.0 g
11.7 N
|
| 2 mm | Stal (~0.2) |
0.99 kg / 988.0 g
9.7 N
|
| 3 mm | Stal (~0.2) |
0.79 kg / 790.0 g
7.7 N
|
| 5 mm | Stal (~0.2) |
0.47 kg / 468.0 g
4.6 N
|
| 10 mm | Stal (~0.2) |
0.11 kg / 108.0 g
1.1 N
|
| 15 mm | Stal (~0.2) |
0.03 kg / 26.0 g
0.3 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 8.0 g
0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
MW 20x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.08 kg / 2079.0 g
20.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.39 kg / 1386.0 g
13.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.69 kg / 693.0 g
6.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.47 kg / 3465.0 g
34.0 N
|
MW 20x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.69 kg / 693.0 g
6.8 N
|
| 1 mm |
|
1.73 kg / 1732.5 g
17.0 N
|
| 2 mm |
|
3.47 kg / 3465.0 g
34.0 N
|
| 5 mm |
|
6.93 kg / 6930.0 g
68.0 N
|
| 10 mm |
|
6.93 kg / 6930.0 g
68.0 N
|
MW 20x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
6.93 kg / 6930.0 g
68.0 N
|
OK |
| 40 °C | -2.2% |
6.78 kg / 6777.5 g
66.5 N
|
OK |
| 60 °C | -4.4% |
6.63 kg / 6625.1 g
65.0 N
|
|
| 80 °C | -6.6% |
6.47 kg / 6472.6 g
63.5 N
|
|
| 100 °C | -28.8% |
4.93 kg / 4934.2 g
48.4 N
|
MW 20x5 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
14.87 kg / 14871 g
145.9 N
4 380 Gs
|
N/A |
| 1 mm |
13.89 kg / 13893 g
136.3 N
5 357 Gs
|
12.50 kg / 12504 g
122.7 N
~0 Gs
|
| 2 mm |
12.82 kg / 12822 g
125.8 N
5 146 Gs
|
11.54 kg / 11540 g
113.2 N
~0 Gs
|
| 3 mm |
11.71 kg / 11713 g
114.9 N
4 918 Gs
|
10.54 kg / 10542 g
103.4 N
~0 Gs
|
| 5 mm |
9.51 kg / 9513 g
93.3 N
4 433 Gs
|
8.56 kg / 8562 g
84.0 N
~0 Gs
|
| 10 mm |
5.03 kg / 5029 g
49.3 N
3 223 Gs
|
4.53 kg / 4526 g
44.4 N
~0 Gs
|
| 20 mm |
1.16 kg / 1162 g
11.4 N
1 549 Gs
|
1.05 kg / 1046 g
10.3 N
~0 Gs
|
| 50 mm |
0.03 kg / 30 g
0.3 N
251 Gs
|
0.03 kg / 27 g
0.3 N
~0 Gs
|
MW 20x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 8.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 6.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 5.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 4.0 cm |
| Car key | 50 Gs (5.0 mT) | 4.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
MW 20x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
25.63 km/h
(7.12 m/s)
|
0.30 J | |
| 30 mm |
42.39 km/h
(11.77 m/s)
|
0.82 J | |
| 50 mm |
54.70 km/h
(15.19 m/s)
|
1.36 J | |
| 100 mm |
77.35 km/h
(21.49 m/s)
|
2.72 J |
MW 20x5 / 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) |
MW 20x5 / N38
| Parameter | Value | Jedn. SI / Opis |
|---|---|---|
| Strumień (Flux) | 9 675 Mx | 96.7 µWb |
| Współczynnik Pc | 0.35 | Niski (Płaski) |
MW 20x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 6.93 kg | Standard |
| Water (riverbed) |
7.93 kg
(+1.00 kg Buoyancy gain)
|
+14.5% |
1. Montaż na Ścianie (Ześlizg)
*Uwaga: Na pionowej ścianie magnes utrzyma tylko ok. 20-30% tego co na suficie.
2. Wpływ Grubości Blachy
*Cienka blacha (np. obudowa PC 0.5mm) drastycznie osłabia magnes.
3. Wytrzymałość Temperaturowa
*Dla materiału N38 granica bezpieczeństwa to 80°C.
Jak rozdzielać?
Nie próbuj odrywać magnesów siłą!
Zawsze zsuwaj je na bok krawędzi stołu.
Elektronika
Trzymaj z dala od dysków HDD, kart płatniczych i telefonów.
Rozruszniki Serca
Osoby z rozrusznikiem muszą zachować dystans min. 10 cm.
Nie dla dzieci
Ryzyko połknięcia. Połknięcie dwóch magnesów grozi śmiercią.
Kruchy materiał
Magnes to ceramika! Uderzenie o inny magnes spowoduje odpryski.
Do czego użyć tego magnesu?
Sprawdzone zastosowania dla wymiaru 15x10x2 mm
Elektronika i Czujniki
Idealny jako element wyzwalający dla czujników Halla oraz kontaktronów w systemach alarmowych. Płaski kształt (2mm) pozwala na ukrycie go w wąskich szczelinach obudowy.
Modelarstwo i Druk 3D
Stosowany do tworzenia niewidocznych zamknięć w modelach drukowanych 3D. Można go wprasować w wydruk lub wkleić w kieszeń zaprojektowaną w modelu CAD.
Meble i Fronty
Używany jako "domykacz" lekkich drzwiczek szafkowych, gdzie standardowe magnesy meblowe są za grube. Wymaga wklejenia w płytkie podfrezowanie.
See more products
Advantages as well as disadvantages of rare earth magnets.
In addition to their long-term stability, neodymium magnets provide the following advantages:
- They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
- Magnets effectively protect themselves against demagnetization caused by ambient magnetic noise,
- In other words, due to the glossy finish of gold, the element gains a professional look,
- Magnets exhibit exceptionally strong magnetic induction on the outer side,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to the possibility of precise shaping and customization to unique projects, magnetic components can be produced in a wide range of shapes and sizes, which amplifies use scope,
- Huge importance in advanced technology sectors – they are utilized in mass storage devices, drive modules, advanced medical instruments, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems
Disadvantages of neodymium magnets:
- They are fragile upon too strong 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 force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. 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 those in rubber or plastics, which secure oxidation as well as corrosion.
- Due to limitations in realizing threads and complex forms in magnets, we recommend using cover - magnetic mount.
- Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Maximum lifting capacity of the magnet – what it depends on?
The force parameter is a result of laboratory testing conducted under the following configuration:
- on a block made of structural steel, optimally conducting the magnetic field
- possessing a thickness of at least 10 mm to avoid saturation
- with an ground touching surface
- under conditions of ideal adhesion (metal-to-metal)
- under perpendicular force direction (90-degree angle)
- at temperature room level
Impact of factors on magnetic holding capacity in practice
In practice, the real power results from several key aspects, presented from crucial:
- Clearance – the presence of any layer (rust, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
- Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
- Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
- Chemical composition of the base – mild steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
- Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
- Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.
Advantages as well as disadvantages of rare earth magnets.
In addition to their long-term stability, neodymium magnets provide the following advantages:
- They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
- Magnets effectively protect themselves against demagnetization caused by ambient magnetic noise,
- In other words, due to the glossy finish of gold, the element gains a professional look,
- Magnets exhibit exceptionally strong magnetic induction on the outer side,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to the possibility of precise shaping and customization to unique projects, magnetic components can be produced in a wide range of shapes and sizes, which amplifies use scope,
- Huge importance in advanced technology sectors – they are utilized in mass storage devices, drive modules, advanced medical instruments, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems
Disadvantages of neodymium magnets:
- They are fragile upon too strong 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 force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. 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 those in rubber or plastics, which secure oxidation as well as corrosion.
- Due to limitations in realizing threads and complex forms in magnets, we recommend using cover - magnetic mount.
- Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Maximum lifting capacity of the magnet – what it depends on?
The force parameter is a result of laboratory testing conducted under the following configuration:
- on a block made of structural steel, optimally conducting the magnetic field
- possessing a thickness of at least 10 mm to avoid saturation
- with an ground touching surface
- under conditions of ideal adhesion (metal-to-metal)
- under perpendicular force direction (90-degree angle)
- at temperature room level
Impact of factors on magnetic holding capacity in practice
In practice, the real power results from several key aspects, presented from crucial:
- Clearance – the presence of any layer (rust, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
- Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
- Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
- Chemical composition of the base – mild steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
- Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
- Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.
Warnings
Implant safety
Warning for patients: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.
Conscious usage
Before use, read the rules. Sudden snapping can destroy the magnet or injure your hand. Think ahead.
Crushing risk
Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!
Electronic hazard
Do not bring magnets close to a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.
Machining danger
Drilling and cutting of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
Heat sensitivity
Regular neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.
Avoid contact if allergic
It is widely known that the nickel plating (the usual finish) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact and choose encased magnets.
Compass and GPS
An intense magnetic field disrupts the functioning of magnetometers in phones and GPS navigation. Keep magnets close to a device to avoid breaking the sensors.
Fragile material
Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.
Adults only
Neodymium magnets are not intended for children. Accidental ingestion of a few magnets can lead to them attracting across intestines, which poses a critical condition and requires immediate surgery.
Important!
Want to know more? Check our post: Why are neodymium magnets dangerous?
