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MW 20x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010044

GTIN: 5906301810438

5.00

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 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
properties values
Cat. no. 010044
GTIN 5906301810438
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
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

Specification / characteristics MW 20x5 / N38 - cylindrical magnet
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

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.

Table 1: Static force (force vs gap) - power drop
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
Table 2: Slippage Load (Vertical Surface)
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
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 20x5 / N38
Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.69 kg / 693.0 g
6.8 N
1 mm
25%
1.73 kg / 1732.5 g
17.0 N
2 mm
50%
3.47 kg / 3465.0 g
34.0 N
5 mm
100%
6.93 kg / 6930.0 g
68.0 N
10 mm
100%
6.93 kg / 6930.0 g
68.0 N
Table 5: Working in heat (material behavior) - power drop
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
Table 6: Two magnets (repulsion) - forces in the system
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
Table 7: Hazards (implants) - warnings
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
Table 8: Collisions (kinetic energy) - warning
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
Table 9: Anti-corrosion coating durability
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)
Table 10: Design data (Flux)
MW 20x5 / N38
Parameter Value Jedn. SI / Opis
Strumień (Flux) 9 675 Mx 96.7 µWb
Współczynnik Pc 0.35 Niski (Płaski)
Table 11: Hydrostatics and buoyancy
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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
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.

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The presented product is a very strong cylinder magnet, made from modern NdFeB material, which, with dimensions of Ø20x5 mm, guarantees the highest energy density. The MW 20x5 / N38 component boasts high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 6.93 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 67.95 N with a weight of only 11.78 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø20x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
This model is characterized by dimensions Ø20x5 mm, which, at a weight of 11.78 g, makes it an element with impressive magnetic energy density. The value of 67.95 N means that the magnet is capable of holding a weight many times exceeding its own mass of 11.78 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 20 mm. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

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 magnetwhat 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 magnetwhat 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?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98